diff --git a/classes/api.php b/classes/api.php
index 422fc5a1b..945496bcf 100644
--- a/classes/api.php
+++ b/classes/api.php
@@ -50,16 +50,16 @@ class API extends Handler {
 		@session_destroy();
 		@session_start();
 
-		$login = db_escape_string($_REQUEST["user"]);
+		$login = $this->dbh->escape_string($_REQUEST["user"]);
 		$password = $_REQUEST["password"];
 		$password_base64 = base64_decode($_REQUEST["password"]);
 
 		if (SINGLE_USER_MODE) $login = "admin";
 
-		$result = db_query("SELECT id FROM ttrss_users WHERE login = '$login'");
+		$result = $this->dbh->query("SELECT id FROM ttrss_users WHERE login = '$login'");
 
-		if (db_num_rows($result) != 0) {
-			$uid = db_fetch_result($result, 0, "id");
+		if ($this->dbh->num_rows($result) != 0) {
+			$uid = $this->dbh->fetch_result($result, 0, "id");
 		} else {
 			$uid = 0;
 		}
@@ -95,8 +95,8 @@ class API extends Handler {
 	}
 
 	function getUnread() {
-		$feed_id = db_escape_string($_REQUEST["feed_id"]);
-		$is_cat = db_escape_string($_REQUEST["is_cat"]);
+		$feed_id = $this->dbh->escape_string($_REQUEST["feed_id"]);
+		$is_cat = $this->dbh->escape_string($_REQUEST["is_cat"]);
 
 		if ($feed_id) {
 			print $this->wrap(self::STATUS_OK, array("unread" => getFeedUnread($feed_id, $is_cat)));
@@ -111,10 +111,10 @@ class API extends Handler {
 	}
 
 	function getFeeds() {
-		$cat_id = db_escape_string($_REQUEST["cat_id"]);
+		$cat_id = $this->dbh->escape_string($_REQUEST["cat_id"]);
 		$unread_only = sql_bool_to_bool($_REQUEST["unread_only"]);
-		$limit = (int) db_escape_string($_REQUEST["limit"]);
-		$offset = (int) db_escape_string($_REQUEST["offset"]);
+		$limit = (int) $this->dbh->escape_string($_REQUEST["limit"]);
+		$offset = (int) $this->dbh->escape_string($_REQUEST["offset"]);
 		$include_nested = sql_bool_to_bool($_REQUEST["include_nested"]);
 
 		$feeds = $this->api_get_feeds($cat_id, $unread_only, $limit, $offset, $include_nested);
@@ -134,7 +134,7 @@ class API extends Handler {
 		else
 			$nested_qpart = "true";
 
-		$result = db_query("SELECT
+		$result = $this->dbh->query("SELECT
 				id, title, order_id, (SELECT COUNT(id) FROM
 				ttrss_feeds WHERE
 				ttrss_feed_categories.id IS NOT NULL AND cat_id = ttrss_feed_categories.id) AS num_feeds,
@@ -147,7 +147,7 @@ class API extends Handler {
 
 		$cats = array();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			if ($include_empty || $line["num_feeds"] > 0 || $line["num_cats"] > 0) {
 				$unread = getFeedUnread($line["id"], true);
 
@@ -180,22 +180,22 @@ class API extends Handler {
 	}
 
 	function getHeadlines() {
-		$feed_id = db_escape_string($_REQUEST["feed_id"]);
+		$feed_id = $this->dbh->escape_string($_REQUEST["feed_id"]);
 		if ($feed_id != "") {
 
-			$limit = (int)db_escape_string($_REQUEST["limit"]);
+			$limit = (int)$this->dbh->escape_string($_REQUEST["limit"]);
 
 			if (!$limit || $limit >= 60) $limit = 60;
 
-			$offset = (int)db_escape_string($_REQUEST["skip"]);
-			$filter = db_escape_string($_REQUEST["filter"]);
+			$offset = (int)$this->dbh->escape_string($_REQUEST["skip"]);
+			$filter = $this->dbh->escape_string($_REQUEST["filter"]);
 			$is_cat = sql_bool_to_bool($_REQUEST["is_cat"]);
 			$show_excerpt = sql_bool_to_bool($_REQUEST["show_excerpt"]);
 			$show_content = sql_bool_to_bool($_REQUEST["show_content"]);
 			/* all_articles, unread, adaptive, marked, updated */
-			$view_mode = db_escape_string($_REQUEST["view_mode"]);
+			$view_mode = $this->dbh->escape_string($_REQUEST["view_mode"]);
 			$include_attachments = sql_bool_to_bool($_REQUEST["include_attachments"]);
-			$since_id = (int)db_escape_string($_REQUEST["since_id"]);
+			$since_id = (int)$this->dbh->escape_string($_REQUEST["since_id"]);
 			$include_nested = sql_bool_to_bool($_REQUEST["include_nested"]);
 			$sanitize_content = true;
 
@@ -211,8 +211,8 @@ class API extends Handler {
 
 			/* do not rely on params below */
 
-			$search = db_escape_string($_REQUEST["search"]);
-			$search_mode = db_escape_string($_REQUEST["search_mode"]);
+			$search = $this->dbh->escape_string($_REQUEST["search"]);
+			$search_mode = $this->dbh->escape_string($_REQUEST["search_mode"]);
 
 			$headlines = $this->api_get_headlines($feed_id, $limit, $offset,
 				$filter, $is_cat, $show_excerpt, $show_content, $view_mode, $override_order,
@@ -226,10 +226,10 @@ class API extends Handler {
 	}
 
 	function updateArticle() {
-		$article_ids = array_filter(explode(",", db_escape_string($_REQUEST["article_ids"])), is_numeric);
-		$mode = (int) db_escape_string($_REQUEST["mode"]);
-		$data = db_escape_string($_REQUEST["data"]);
-		$field_raw = (int)db_escape_string($_REQUEST["field"]);
+		$article_ids = array_filter(explode(",", $this->dbh->escape_string($_REQUEST["article_ids"])), is_numeric);
+		$mode = (int) $this->dbh->escape_string($_REQUEST["mode"]);
+		$data = $this->dbh->escape_string($_REQUEST["data"]);
+		$field_raw = (int)$this->dbh->escape_string($_REQUEST["field"]);
 
 		$field = "";
 		$set_to = "";
@@ -269,15 +269,15 @@ class API extends Handler {
 
 			$article_ids = join(", ", $article_ids);
 
-			$result = db_query("UPDATE ttrss_user_entries SET $field = $set_to $additional_fields WHERE ref_id IN ($article_ids) AND owner_uid = " . $_SESSION["uid"]);
+			$result = $this->dbh->query("UPDATE ttrss_user_entries SET $field = $set_to $additional_fields WHERE ref_id IN ($article_ids) AND owner_uid = " . $_SESSION["uid"]);
 
-			$num_updated = db_affected_rows($result);
+			$num_updated = $this->dbh->affected_rows($result);
 
 			if ($num_updated > 0 && $field == "unread") {
-				$result = db_query("SELECT DISTINCT feed_id FROM ttrss_user_entries
+				$result = $this->dbh->query("SELECT DISTINCT feed_id FROM ttrss_user_entries
 					WHERE ref_id IN ($article_ids)");
 
-				while ($line = db_fetch_assoc($result)) {
+				while ($line = $this->dbh->fetch_assoc($result)) {
 					ccache_update($line["feed_id"], $_SESSION["uid"]);
 				}
 			}
@@ -304,7 +304,7 @@ class API extends Handler {
 
 	function getArticle() {
 
-		$article_id = join(",", array_filter(explode(",", db_escape_string($_REQUEST["article_id"])), is_numeric));
+		$article_id = join(",", array_filter(explode(",", $this->dbh->escape_string($_REQUEST["article_id"])), is_numeric));
 
 		$query = "SELECT id,title,link,content,cached_content,feed_id,comments,int_id,
 			marked,unread,published,score,
@@ -314,13 +314,13 @@ class API extends Handler {
 			WHERE	id IN ($article_id) AND ref_id = id AND owner_uid = " .
 				$_SESSION["uid"] ;
 
-		$result = db_query($query);
+		$result = $this->dbh->query($query);
 
 		$articles = array();
 
-		if (db_num_rows($result) != 0) {
+		if ($this->dbh->num_rows($result) != 0) {
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 
 				$attachments = get_article_enclosures($line['id']);
 
@@ -363,10 +363,10 @@ class API extends Handler {
 
 		$config["daemon_is_running"] = file_is_locked("update_daemon.lock");
 
-		$result = db_query("SELECT COUNT(*) AS cf FROM
+		$result = $this->dbh->query("SELECT COUNT(*) AS cf FROM
 			ttrss_feeds WHERE owner_uid = " . $_SESSION["uid"]);
 
-		$num_feeds = db_fetch_result($result, 0, "cf");
+		$num_feeds = $this->dbh->fetch_result($result, 0, "cf");
 
 		$config["num_feeds"] = (int)$num_feeds;
 
@@ -376,7 +376,7 @@ class API extends Handler {
 	function updateFeed() {
 		require_once "include/rssfuncs.php";
 
-		$feed_id = (int) db_escape_string($_REQUEST["feed_id"]);
+		$feed_id = (int) $this->dbh->escape_string($_REQUEST["feed_id"]);
 
 		update_rss_feed($feed_id, true);
 
@@ -384,8 +384,8 @@ class API extends Handler {
 	}
 
 	function catchupFeed() {
-		$feed_id = db_escape_string($_REQUEST["feed_id"]);
-		$is_cat = db_escape_string($_REQUEST["is_cat"]);
+		$feed_id = $this->dbh->escape_string($_REQUEST["feed_id"]);
+		$is_cat = $this->dbh->escape_string($_REQUEST["is_cat"]);
 
 		catchup_feed($feed_id, $is_cat);
 
@@ -393,19 +393,19 @@ class API extends Handler {
 	}
 
 	function getPref() {
-		$pref_name = db_escape_string($_REQUEST["pref_name"]);
+		$pref_name = $this->dbh->escape_string($_REQUEST["pref_name"]);
 
 		print $this->wrap(self::STATUS_OK, array("value" => get_pref($pref_name)));
 	}
 
 	function getLabels() {
-		//$article_ids = array_filter(explode(",", db_escape_string($_REQUEST["article_ids"])), is_numeric);
+		//$article_ids = array_filter(explode(",", $this->dbh->escape_string($_REQUEST["article_ids"])), is_numeric);
 
 		$article_id = (int)$_REQUEST['article_id'];
 
 		$rv = array();
 
-		$result = db_query("SELECT id, caption, fg_color, bg_color
+		$result = $this->dbh->query("SELECT id, caption, fg_color, bg_color
 			FROM ttrss_labels2
 			WHERE owner_uid = '".$_SESSION['uid']."' ORDER BY caption");
 
@@ -414,7 +414,7 @@ class API extends Handler {
 		else
 			$article_labels = array();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 
 			$checked = false;
 			foreach ($article_labels as $al) {
@@ -437,11 +437,11 @@ class API extends Handler {
 
 	function setArticleLabel() {
 
-		$article_ids = array_filter(explode(",", db_escape_string($_REQUEST["article_ids"])), is_numeric);
-		$label_id = (int) db_escape_string($_REQUEST['label_id']);
-		$assign = (bool) db_escape_string($_REQUEST['assign']) == "true";
+		$article_ids = array_filter(explode(",", $this->dbh->escape_string($_REQUEST["article_ids"])), is_numeric);
+		$label_id = (int) $this->dbh->escape_string($_REQUEST['label_id']);
+		$assign = (bool) $this->dbh->escape_string($_REQUEST['assign']) == "true";
 
-		$label = db_escape_string(label_find_caption(
+		$label = $this->dbh->escape_string(label_find_caption(
 			$label_id, $_SESSION["uid"]));
 
 		$num_updated = 0;
@@ -481,9 +481,9 @@ class API extends Handler {
 	}
 
 	function shareToPublished() {
-		$title = db_escape_string(strip_tags($_REQUEST["title"]));
-		$url = db_escape_string(strip_tags($_REQUEST["url"]));
-		$content = db_escape_string(strip_tags($_REQUEST["content"]));
+		$title = $this->dbh->escape_string(strip_tags($_REQUEST["title"]));
+		$url = $this->dbh->escape_string(strip_tags($_REQUEST["url"]));
+		$content = $this->dbh->escape_string(strip_tags($_REQUEST["content"]));
 
 		if (Article::create_published_article($title, $url, $content, "", $_SESSION["uid"])) {
 			print $this->wrap(self::STATUS_OK, array("status" => 'OK'));
@@ -709,12 +709,12 @@ class API extends Handler {
 	}
 
 	function unsubscribeFeed() {
-		$feed_id = (int) db_escape_string($_REQUEST["feed_id"]);
+		$feed_id = (int) $this->dbh->escape_string($_REQUEST["feed_id"]);
 
-		$result = db_query("SELECT id FROM ttrss_feeds WHERE
+		$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE
 			id = '$feed_id' AND owner_uid = ".$_SESSION["uid"]);
 
-		if (db_num_rows($result) != 0) {
+		if ($this->dbh->num_rows($result) != 0) {
 			Pref_Feeds::remove_feed($feed_id, $_SESSION["uid"]);
 			print $this->wrap(self::STATUS_OK, array("status" => "OK"));
 		} else {
@@ -723,10 +723,10 @@ class API extends Handler {
 	}
 
 	function subscribeToFeed() {
-		$feed_url = db_escape_string($_REQUEST["feed_url"]);
-		$category_id = (int) db_escape_string($_REQUEST["category_id"]);
-		$login = db_escape_string($_REQUEST["login"]);
-		$password = db_escape_string($_REQUEST["password"]);
+		$feed_url = $this->dbh->escape_string($_REQUEST["feed_url"]);
+		$category_id = (int) $this->dbh->escape_string($_REQUEST["category_id"]);
+		$login = $this->dbh->escape_string($_REQUEST["login"]);
+		$password = $this->dbh->escape_string($_REQUEST["password"]);
 
 		if ($feed_url) {
 			$rc = subscribe_to_feed($feed_url, $category_id,
@@ -760,16 +760,16 @@ class API extends Handler {
 	private function isCategoryEmpty($id) {
 
 		if ($id == -2) {
-			$result = db_query("SELECT COUNT(*) AS count FROM ttrss_labels2
+			$result = $this->dbh->query("SELECT COUNT(*) AS count FROM ttrss_labels2
 				WHERE owner_uid = " . $_SESSION["uid"]);
 
-			return db_fetch_result($result, 0, "count") == 0;
+			return $this->dbh->fetch_result($result, 0, "count") == 0;
 
 		} else if ($id == 0) {
-			$result = db_query("SELECT COUNT(*) AS count FROM ttrss_feeds
+			$result = $this->dbh->query("SELECT COUNT(*) AS count FROM ttrss_feeds
 				WHERE cat_id IS NULL AND owner_uid = " . $_SESSION["uid"]);
 
-			return db_fetch_result($result, 0, "count") == 0;
+			return $this->dbh->fetch_result($result, 0, "count") == 0;
 
 		}
 
diff --git a/classes/article.php b/classes/article.php
index df850daca..1198eefa9 100644
--- a/classes/article.php
+++ b/classes/article.php
@@ -8,14 +8,14 @@ class Article extends Handler_Protected {
 	}
 
 	function redirect() {
-		$id = db_escape_string($_REQUEST['id']);
+		$id = $this->dbh->escape_string($_REQUEST['id']);
 
-		$result = db_query("SELECT link FROM ttrss_entries, ttrss_user_entries
+		$result = $this->dbh->query("SELECT link FROM ttrss_entries, ttrss_user_entries
 						WHERE id = '$id' AND id = ref_id AND owner_uid = '".$_SESSION['uid']."'
 						LIMIT 1");
 
-		if (db_num_rows($result) == 1) {
-			$article_url = db_fetch_result($result, 0, 'link');
+		if ($this->dbh->num_rows($result) == 1) {
+			$article_url = $this->dbh->fetch_result($result, 0, 'link');
 			$article_url = str_replace("\n", "", $article_url);
 
 			header("Location: $article_url");
@@ -27,10 +27,10 @@ class Article extends Handler_Protected {
 	}
 
 	function view() {
-		$id = db_escape_string($_REQUEST["id"]);
-		$cids = explode(",", db_escape_string($_REQUEST["cids"]));
-		$mode = db_escape_string($_REQUEST["mode"]);
-		$omode = db_escape_string($_REQUEST["omode"]);
+		$id = $this->dbh->escape_string($_REQUEST["id"]);
+		$cids = explode(",", $this->dbh->escape_string($_REQUEST["cids"]));
+		$mode = $this->dbh->escape_string($_REQUEST["mode"]);
+		$omode = $this->dbh->escape_string($_REQUEST["omode"]);
 
 		// in prefetch mode we only output requested cids, main article
 		// just gets marked as read (it already exists in client cache)
@@ -68,15 +68,15 @@ class Article extends Handler_Protected {
 	private function catchupArticleById($id, $cmode) {
 
 		if ($cmode == 0) {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			unread = false,last_read = NOW()
 			WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 		} else if ($cmode == 1) {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			unread = true
 			WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 		} else {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			unread = NOT unread,last_read = NOW()
 			WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 		}
@@ -178,9 +178,9 @@ class Article extends Handler_Protected {
 
 		print __("Tags for this article (separated by commas):")."<br>";
 
-		$param = db_escape_string($_REQUEST['param']);
+		$param = $this->dbh->escape_string($_REQUEST['param']);
 
-		$tags = get_article_tags(db_escape_string($param));
+		$tags = get_article_tags($this->dbh->escape_string($param));
 
 		$tags_str = join(", ", $tags);
 
@@ -209,10 +209,10 @@ class Article extends Handler_Protected {
 	}
 
 	function setScore() {
-		$ids = db_escape_string($_REQUEST['id']);
-		$score = (int)db_escape_string($_REQUEST['score']);
+		$ids = $this->dbh->escape_string($_REQUEST['id']);
+		$score = (int)$this->dbh->escape_string($_REQUEST['score']);
 
-		db_query("UPDATE ttrss_user_entries SET
+		$this->dbh->query("UPDATE ttrss_user_entries SET
 			score = '$score' WHERE ref_id IN ($ids) AND owner_uid = " . $_SESSION["uid"]);
 
 		print json_encode(array("id" => $id,
@@ -222,23 +222,23 @@ class Article extends Handler_Protected {
 
 	function setArticleTags() {
 
-		$id = db_escape_string($_REQUEST["id"]);
+		$id = $this->dbh->escape_string($_REQUEST["id"]);
 
-		$tags_str = db_escape_string($_REQUEST["tags_str"]);
+		$tags_str = $this->dbh->escape_string($_REQUEST["tags_str"]);
 		$tags = array_unique(trim_array(explode(",", $tags_str)));
 
-		db_query("BEGIN");
+		$this->dbh->query("BEGIN");
 
-		$result = db_query("SELECT int_id FROM ttrss_user_entries WHERE
+		$result = $this->dbh->query("SELECT int_id FROM ttrss_user_entries WHERE
 				ref_id = '$id' AND owner_uid = '".$_SESSION["uid"]."' LIMIT 1");
 
-		if (db_num_rows($result) == 1) {
+		if ($this->dbh->num_rows($result) == 1) {
 
 			$tags_to_cache = array();
 
-			$int_id = db_fetch_result($result, 0, "int_id");
+			$int_id = $this->dbh->fetch_result($result, 0, "int_id");
 
-			db_query("DELETE FROM ttrss_tags WHERE
+			$this->dbh->query("DELETE FROM ttrss_tags WHERE
 				post_int_id = $int_id AND owner_uid = '".$_SESSION["uid"]."'");
 
 			foreach ($tags as $tag) {
@@ -255,7 +255,7 @@ class Article extends Handler_Protected {
 				//					print "<!-- $id : $int_id : $tag -->";
 
 				if ($tag != '') {
-					db_query("INSERT INTO ttrss_tags
+					$this->dbh->query("INSERT INTO ttrss_tags
 								(post_int_id, owner_uid, tag_name) VALUES ('$int_id', '".$_SESSION["uid"]."', '$tag')");
 				}
 
@@ -267,12 +267,12 @@ class Article extends Handler_Protected {
 			sort($tags_to_cache);
 			$tags_str = join(",", $tags_to_cache);
 
-			db_query("UPDATE ttrss_user_entries
+			$this->dbh->query("UPDATE ttrss_user_entries
 				SET tag_cache = '$tags_str' WHERE ref_id = '$id'
 						AND owner_uid = " . $_SESSION["uid"]);
 		}
 
-		db_query("COMMIT");
+		$this->dbh->query("COMMIT");
 
 		$tags = get_article_tags($id);
 		$tags_str = format_tags_string($tags, $id);
@@ -286,15 +286,15 @@ class Article extends Handler_Protected {
 
 
 	function completeTags() {
-		$search = db_escape_string($_REQUEST["search"]);
+		$search = $this->dbh->escape_string($_REQUEST["search"]);
 
-		$result = db_query("SELECT DISTINCT tag_name FROM ttrss_tags
+		$result = $this->dbh->query("SELECT DISTINCT tag_name FROM ttrss_tags
 				WHERE owner_uid = '".$_SESSION["uid"]."' AND
 				tag_name LIKE '$search%' ORDER BY tag_name
 				LIMIT 10");
 
 		print "<ul>";
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			print "<li>" . $line["tag_name"] . "</li>";
 		}
 		print "</ul>";
@@ -311,10 +311,10 @@ class Article extends Handler_Protected {
 	private function labelops($assign) {
 		$reply = array();
 
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
-		$label_id = db_escape_string($_REQUEST["lid"]);
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
+		$label_id = $this->dbh->escape_string($_REQUEST["lid"]);
 
-		$label = db_escape_string(label_find_caption($label_id,
+		$label = $this->dbh->escape_string(label_find_caption($label_id,
 		$_SESSION["uid"]));
 
 		$reply["info-for-headlines"] = array();
diff --git a/classes/auth/base.php b/classes/auth/base.php
index 782848a79..284ac1d38 100644
--- a/classes/auth/base.php
+++ b/classes/auth/base.php
@@ -15,7 +15,7 @@ class Auth_Base {
 			$user_id = $this->find_user_by_login($login);
 
 			if (!$user_id) {
-				$login = db_escape_string($login);
+				$login = $this->dbh->escape_string($login);
 				$salt = substr(bin2hex(get_random_bytes(125)), 0, 250);
 				$pwd_hash = encrypt_password($password, $salt, true);
 
@@ -23,7 +23,7 @@ class Auth_Base {
 						(login,access_level,last_login,created,pwd_hash,salt)
 						VALUES ('$login', 0, null, NOW(), '$pwd_hash','$salt')";
 
-				db_query($query);
+				$this->dbh->query($query);
 
 				return $this->find_user_by_login($login);
 
@@ -36,13 +36,13 @@ class Auth_Base {
 	}
 
 	function find_user_by_login($login) {
-		$login = db_escape_string($login);
+		$login = $this->dbh->escape_string($login);
 
-		$result = db_query("SELECT id FROM ttrss_users WHERE
+		$result = $this->dbh->query("SELECT id FROM ttrss_users WHERE
 			login = '$login'");
 
-		if (db_num_rows($result) > 0) {
-			return db_fetch_result($result, 0, "id");
+		if ($this->dbh->num_rows($result) > 0) {
+			return $this->dbh->fetch_result($result, 0, "id");
 		} else {
 			return false;
 		}
diff --git a/classes/dbupdater.php b/classes/dbupdater.php
index a319da03d..f157342d4 100644
--- a/classes/dbupdater.php
+++ b/classes/dbupdater.php
@@ -2,18 +2,18 @@
 class DbUpdater {
 
 	private $dbh;
-	private $db_type;
+	private $$this->dbh->type;
 	private $need_version;
 
-	function __construct($dbh, $db_type, $need_version) {
+	function __construct($dbh, $$this->dbh->type, $need_version) {
 		$this->dbh = $dbh;
-		$this->db_type = $db_type;
+		$this->$this->dbh->type = $db_type;
 		$this->need_version = (int) $need_version;
 	}
 
 	function getSchemaVersion() {
-		$result = db_query("SELECT schema_version FROM ttrss_version");
-		return (int) db_fetch_result($result, 0, "schema_version");
+		$result = $this->dbh->query("SELECT schema_version FROM ttrss_version");
+		return (int) $this->dbh->fetch_result($result, 0, "schema_version");
 	}
 
 	function isUpdateRequired() {
@@ -21,7 +21,7 @@ class DbUpdater {
 	}
 
 	function getSchemaLines($version) {
-		$filename = "schema/versions/".$this->db_type."/$version.sql";
+		$filename = "schema/versions/".$this->$this->dbh->type."/$version.sql";
 
 		if (file_exists($filename)) {
 			return explode(";", preg_replace("/[\r\n]/", "", file_get_contents($filename)));
@@ -37,21 +37,21 @@ class DbUpdater {
 
 			if (is_array($lines)) {
 
-				db_query("BEGIN");
+				$this->dbh->query("BEGIN");
 
 				foreach ($lines as $line) {
 					if (strpos($line, "--") !== 0 && $line) {
-						db_query($line);
+						$this->dbh->query($line);
 					}
 				}
 
-				$db_version = $this->getSchemaVersion();
+				$$this->dbh->version = $this->getSchemaVersion();
 
-				if ($db_version == $version) {
-					db_query("COMMIT");
+				if ($$this->dbh->version == $version) {
+					$this->dbh->query("COMMIT");
 					return true;
 				} else {
-					db_query("ROLLBACK");
+					$this->dbh->query("ROLLBACK");
 					return false;
 				}
 			} else {
diff --git a/classes/dlg.php b/classes/dlg.php
index 5e14690c4..cfa960d9a 100644
--- a/classes/dlg.php
+++ b/classes/dlg.php
@@ -6,7 +6,7 @@ class Dlg extends Handler_Protected {
 		if (parent::before($method)) {
 			header("Content-Type: text/html"); # required for iframe
 
-			$this->param = db_escape_string($_REQUEST["param"]);
+			$this->param = $this->dbh->escape_string($_REQUEST["param"]);
 			return true;
 		}
 		return false;
@@ -18,7 +18,7 @@ class Dlg extends Handler_Protected {
 		print "<div class=\"prefFeedOPMLHolder\">";
 		$owner_uid = $_SESSION["uid"];
 
-		db_query("BEGIN");
+		$this->dbh->query("BEGIN");
 
 		print "<ul class='nomarks'>";
 
@@ -26,7 +26,7 @@ class Dlg extends Handler_Protected {
 
 		$opml->opml_import($_SESSION["uid"]);
 
-		db_query("COMMIT");
+		$this->dbh->query("COMMIT");
 
 		print "</ul>";
 		print "</div>";
@@ -106,11 +106,11 @@ class Dlg extends Handler_Protected {
 			FROM ttrss_tags WHERE owner_uid = ".$_SESSION["uid"]."
 			GROUP BY tag_name ORDER BY count DESC LIMIT 50";
 
-		$result = db_query($query);
+		$result = $this->dbh->query($query);
 
 		$tags = array();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$tags[$line["tag_name"]] = $line["count"];
 		}
 
@@ -171,10 +171,10 @@ class Dlg extends Handler_Protected {
 		print "<label for=\"tag_mode_all\">".__("All tags.")."</input>";
 
 		print "<select id=\"all_tags\" name=\"all_tags\" title=\"" . __('Which Tags?') . "\" multiple=\"multiple\" size=\"10\" style=\"width : 100%\">";
-		$result = db_query("SELECT DISTINCT tag_name FROM ttrss_tags WHERE owner_uid = ".$_SESSION['uid']."
+		$result = $this->dbh->query("SELECT DISTINCT tag_name FROM ttrss_tags WHERE owner_uid = ".$_SESSION['uid']."
 			AND LENGTH(tag_name) <= 30 ORDER BY tag_name ASC");
 
-		while ($row = db_fetch_assoc($result)) {
+		while ($row = $this->dbh->fetch_assoc($result)) {
 			$tmp = htmlspecialchars($row["tag_name"]);
 			print "<option value=\"" . str_replace(" ", "%20", $tmp) . "\">$tmp</option>";
 		}
@@ -195,7 +195,7 @@ class Dlg extends Handler_Protected {
 	function generatedFeed() {
 
 		$this->params = explode(":", $this->param, 3);
-		$feed_id = db_escape_string($this->params[0]);
+		$feed_id = $this->dbh->escape_string($this->params[0]);
 		$is_cat = (bool) $this->params[1];
 
 		$key = get_feed_access_key($feed_id, $is_cat);
diff --git a/classes/feeds.php b/classes/feeds.php
index 153c0f5aa..969c25db1 100644
--- a/classes/feeds.php
+++ b/classes/feeds.php
@@ -164,19 +164,19 @@ class Feeds extends Handler_Protected {
 		if ($method == "ForceUpdate" && $feed > 0 && is_numeric($feed)) {
 			// Update the feed if required with some basic flood control
 
-			$result = db_query(
+			$result = $this->dbh->query(
 				"SELECT cache_images,".SUBSTRING_FOR_DATE."(last_updated,1,19) AS last_updated
 					FROM ttrss_feeds WHERE id = '$feed'");
 
-				if (db_num_rows($result) != 0) {
-					$last_updated = strtotime(db_fetch_result($result, 0, "last_updated"));
-					$cache_images = sql_bool_to_bool(db_fetch_result($result, 0, "cache_images"));
+				if ($this->dbh->num_rows($result) != 0) {
+					$last_updated = strtotime($this->dbh->fetch_result($result, 0, "last_updated"));
+					$cache_images = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "cache_images"));
 
 					if (!$cache_images && time() - $last_updated > 120 || isset($_REQUEST['DevForceUpdate'])) {
 						include "rssfuncs.php";
 						update_rss_feed($feed, true, true);
 					} else {
-						db_query("UPDATE ttrss_feeds SET last_updated = '1970-01-01', last_update_started = '1970-01-01'
+						$this->dbh->query("UPDATE ttrss_feeds SET last_updated = '1970-01-01', last_update_started = '1970-01-01'
 							WHERE id = '$feed'");
 					}
 				}
@@ -189,21 +189,21 @@ class Feeds extends Handler_Protected {
 		// FIXME: might break tag display?
 
 		if (is_numeric($feed) && $feed > 0 && !$cat_view) {
-			$result = db_query(
+			$result = $this->dbh->query(
 				"SELECT id FROM ttrss_feeds WHERE id = '$feed' LIMIT 1");
 
-			if (db_num_rows($result) == 0) {
+			if ($this->dbh->num_rows($result) == 0) {
 				$reply['content'] = "<div align='center'>".__('Feed not found.')."</div>";
 			}
 		}
 
-		@$search = db_escape_string($_REQUEST["query"]);
+		@$search = $this->dbh->escape_string($_REQUEST["query"]);
 
 		if ($search) {
 			$disable_cache = true;
 		}
 
-		@$search_mode = db_escape_string($_REQUEST["search_mode"]);
+		@$search_mode = $this->dbh->escape_string($_REQUEST["search_mode"]);
 
 		if ($_REQUEST["debug"]) $timing_info = print_checkpoint("H0", $timing_info);
 
@@ -259,7 +259,7 @@ class Feeds extends Handler_Protected {
 			$feed, $cat_view, $search, $search_mode, $view_mode,
 			$last_error);
 
-		$headlines_count = db_num_rows($result);
+		$headlines_count = $this->dbh->num_rows($result);
 
 		/* if (get_pref('COMBINED_DISPLAY_MODE')) {
 			$button_plugins = array();
@@ -275,7 +275,7 @@ class Feeds extends Handler_Protected {
 
 		global $pluginhost;
 
-		if (db_num_rows($result) > 0) {
+		if ($this->dbh->num_rows($result) > 0) {
 
 			$lnum = $offset;
 
@@ -288,7 +288,7 @@ class Feeds extends Handler_Protected {
 
 			$expand_cdm = get_pref('CDM_EXPANDED');
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 				$class = ($lnum % 2) ? "even" : "odd";
 
 				$id = $line["id"];
@@ -633,17 +633,17 @@ class Feeds extends Handler_Protected {
 
 			if ($line["orig_feed_id"]) {
 
-				$tmp_result = db_query("SELECT * FROM ttrss_archived_feeds
+				$tmp_result = $this->dbh->query("SELECT * FROM ttrss_archived_feeds
 					WHERE id = ".$line["orig_feed_id"]);
 
-						if (db_num_rows($tmp_result) != 0) {
+						if ($this->dbh->num_rows($tmp_result) != 0) {
 
 							$reply['content'] .= "<div clear='both'>";
 							$reply['content'] .= __("Originally from:");
 
 							$reply['content'] .= "&nbsp;";
 
-							$tmp_line = db_fetch_assoc($tmp_result);
+							$tmp_line = $this->dbh->fetch_assoc($tmp_result);
 
 							$reply['content'] .= "<a target='_blank'
 								href=' " . htmlspecialchars($tmp_line['site_url']) . "'>" .
@@ -757,18 +757,18 @@ class Feeds extends Handler_Protected {
 
 				$reply['content'] .= "<p><span class=\"insensitive\">";
 
-				$result = db_query("SELECT ".SUBSTRING_FOR_DATE."(MAX(last_updated), 1, 19) AS last_updated FROM ttrss_feeds
+				$result = $this->dbh->query("SELECT ".SUBSTRING_FOR_DATE."(MAX(last_updated), 1, 19) AS last_updated FROM ttrss_feeds
 					WHERE owner_uid = " . $_SESSION['uid']);
 
-				$last_updated = db_fetch_result($result, 0, "last_updated");
+				$last_updated = $this->dbh->fetch_result($result, 0, "last_updated");
 				$last_updated = make_local_datetime($last_updated, false);
 
 				$reply['content'] .= sprintf(__("Feeds last updated at %s"), $last_updated);
 
-				$result = db_query("SELECT COUNT(id) AS num_errors
+				$result = $this->dbh->query("SELECT COUNT(id) AS num_errors
 					FROM ttrss_feeds WHERE last_error != '' AND owner_uid = ".$_SESSION["uid"]);
 
-				$num_errors = db_fetch_result($result, 0, "num_errors");
+				$num_errors = $this->dbh->fetch_result($result, 0, "num_errors");
 
 				if ($num_errors > 0) {
 					$reply['content'] .= "<br/>";
@@ -786,7 +786,7 @@ class Feeds extends Handler_Protected {
 	}
 
 	function catchupAll() {
-		db_query("UPDATE ttrss_user_entries SET
+		$this->dbh->query("UPDATE ttrss_user_entries SET
 						last_read = NOW(), unread = false WHERE unread = true AND owner_uid = " . $_SESSION["uid"]);
 		ccache_zero_all($_SESSION["uid"]);
 	}
@@ -798,17 +798,17 @@ class Feeds extends Handler_Protected {
 
 		if ($_REQUEST["debug"]) $timing_info = print_checkpoint("0", $timing_info);
 
-		$omode = db_escape_string($_REQUEST["omode"]);
+		$omode = $this->dbh->escape_string($_REQUEST["omode"]);
 
-		$feed = db_escape_string($_REQUEST["feed"]);
-		$method = db_escape_string($_REQUEST["m"]);
-		$view_mode = db_escape_string($_REQUEST["view_mode"]);
+		$feed = $this->dbh->escape_string($_REQUEST["feed"]);
+		$method = $this->dbh->escape_string($_REQUEST["m"]);
+		$view_mode = $this->dbh->escape_string($_REQUEST["view_mode"]);
 		$limit = 30;
 		@$cat_view = $_REQUEST["cat"] == "true";
-		@$next_unread_feed = db_escape_string($_REQUEST["nuf"]);
-		@$offset = db_escape_string($_REQUEST["skip"]);
-		@$vgroup_last_feed = db_escape_string($_REQUEST["vgrlf"]);
-		$order_by = db_escape_string($_REQUEST["order_by"]);
+		@$next_unread_feed = $this->dbh->escape_string($_REQUEST["nuf"]);
+		@$offset = $this->dbh->escape_string($_REQUEST["skip"]);
+		@$vgroup_last_feed = $this->dbh->escape_string($_REQUEST["vgrlf"]);
+		$order_by = $this->dbh->escape_string($_REQUEST["order_by"]);
 
 		if (is_numeric($feed)) $feed = (int) $feed;
 
@@ -824,17 +824,17 @@ class Feeds extends Handler_Protected {
 
 		if ($feed < LABEL_BASE_INDEX) {
 			$label_feed = feed_to_label_id($feed);
-			$result = db_query("SELECT id FROM ttrss_labels2 WHERE
+			$result = $this->dbh->query("SELECT id FROM ttrss_labels2 WHERE
 							id = '$label_feed' AND owner_uid = " . $_SESSION['uid']);
 		} else if (!$cat_view && is_numeric($feed) && $feed > 0) {
-			$result = db_query("SELECT id FROM ttrss_feeds WHERE
+			$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE
 							id = '$feed' AND owner_uid = " . $_SESSION['uid']);
 		} else if ($cat_view && is_numeric($feed) && $feed > 0) {
-			$result = db_query("SELECT id FROM ttrss_feed_categories WHERE
+			$result = $this->dbh->query("SELECT id FROM ttrss_feed_categories WHERE
 							id = '$feed' AND owner_uid = " . $_SESSION['uid']);
 		}
 
-		if ($result && db_num_rows($result) == 0) {
+		if ($result && $this->dbh->num_rows($result) == 0) {
 			print json_encode($this->generate_error_feed(__("Feed not found.")));
 			return;
 		}
@@ -851,13 +851,13 @@ class Feeds extends Handler_Protected {
 
 		/* bump login timestamp if needed */
 		if (time() - $_SESSION["last_login_update"] > 3600) {
-			db_query("UPDATE ttrss_users SET last_login = NOW() WHERE id = " .
+			$this->dbh->query("UPDATE ttrss_users SET last_login = NOW() WHERE id = " .
 				$_SESSION["uid"]);
 			$_SESSION["last_login_update"] = time();
 		}
 
 		if (!$cat_view && is_numeric($feed) && $feed > 0) {
-			db_query("UPDATE ttrss_feeds SET last_viewed = NOW()
+			$this->dbh->query("UPDATE ttrss_feeds SET last_viewed = NOW()
 							WHERE id = '$feed' AND owner_uid = ".$_SESSION["uid"]);
 		}
 
@@ -924,18 +924,18 @@ class Feeds extends Handler_Protected {
 
 		$reply['headlines']['content'] .= "<p><span class=\"insensitive\">";
 
-		$result = db_query("SELECT ".SUBSTRING_FOR_DATE."(MAX(last_updated), 1, 19) AS last_updated FROM ttrss_feeds
+		$result = $this->dbh->query("SELECT ".SUBSTRING_FOR_DATE."(MAX(last_updated), 1, 19) AS last_updated FROM ttrss_feeds
 			WHERE owner_uid = " . $_SESSION['uid']);
 
-		$last_updated = db_fetch_result($result, 0, "last_updated");
+		$last_updated = $this->dbh->fetch_result($result, 0, "last_updated");
 		$last_updated = make_local_datetime($last_updated, false);
 
 		$reply['headlines']['content'] .= sprintf(__("Feeds last updated at %s"), $last_updated);
 
-		$result = db_query("SELECT COUNT(id) AS num_errors
+		$result = $this->dbh->query("SELECT COUNT(id) AS num_errors
 			FROM ttrss_feeds WHERE last_error != '' AND owner_uid = ".$_SESSION["uid"]);
 
-		$num_errors = db_fetch_result($result, 0, "num_errors");
+		$num_errors = $this->dbh->fetch_result($result, 0, "num_errors");
 
 		if ($num_errors > 0) {
 			$reply['headlines']['content'] .= "<br/>";
@@ -1044,7 +1044,7 @@ class Feeds extends Handler_Protected {
 	function feedBrowser() {
 		if (defined('_DISABLE_FEED_BROWSER') && _DISABLE_FEED_BROWSER) return;
 
-		$browser_search = db_escape_string($_REQUEST["search"]);
+		$browser_search = $this->dbh->escape_string($_REQUEST["search"]);
 
 		print "<input dojoType=\"dijit.form.TextBox\" style=\"display : none\" name=\"op\" value=\"rpc\">";
 		print "<input dojoType=\"dijit.form.TextBox\" style=\"display : none\" name=\"method\" value=\"updateFeedBrowser\">";
@@ -1092,7 +1092,7 @@ class Feeds extends Handler_Protected {
 	}
 
 	function search() {
-		$this->params = explode(":", db_escape_string($_REQUEST["param"]), 2);
+		$this->params = explode(":", $this->dbh->escape_string($_REQUEST["param"]), 2);
 
 		$active_feed_id = sprintf("%d", $this->params[0]);
 		$is_cat = $this->params[1] != "false";
diff --git a/classes/handler/public.php b/classes/handler/public.php
index 5af416adc..439cc7d4d 100644
--- a/classes/handler/public.php
+++ b/classes/handler/public.php
@@ -28,8 +28,8 @@ class Handler_Public extends Handler {
 
 		$result = $qfh_ret[0];
 
-		if (db_num_rows($result) != 0) {
-			$ts = strtotime(db_fetch_result($result, 0, "date_entered"));
+		if ($this->dbh->num_rows($result) != 0) {
+			$ts = strtotime($this->dbh->fetch_result($result, 0, "date_entered"));
 
 			if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) &&
 					strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $ts) {
@@ -74,7 +74,7 @@ class Handler_Public extends Handler {
 
 			$tpl->setVariable('SELF_URL', htmlspecialchars(get_self_url_prefix()), true);
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 
 				$tpl->setVariable('ARTICLE_ID', htmlspecialchars($line['link']), true);
 				$tpl->setVariable('ARTICLE_LINK', htmlspecialchars($line['link']), true);
@@ -151,7 +151,7 @@ class Handler_Public extends Handler {
 
 			$feed['articles'] = array();
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 				$article = array();
 
 				$article['id'] = $line['link'];
@@ -201,13 +201,13 @@ class Handler_Public extends Handler {
 	}
 
 	function getUnread() {
-		$login = db_escape_string($_REQUEST["login"]);
+		$login = $this->dbh->escape_string($_REQUEST["login"]);
 		$fresh = $_REQUEST["fresh"] == "1";
 
-		$result = db_query("SELECT id FROM ttrss_users WHERE login = '$login'");
+		$result = $this->dbh->query("SELECT id FROM ttrss_users WHERE login = '$login'");
 
-		if (db_num_rows($result) == 1) {
-			$uid = db_fetch_result($result, 0, "id");
+		if ($this->dbh->num_rows($result) == 1) {
+			$uid = $this->dbh->fetch_result($result, 0, "id");
 
 			print getGlobalUnread($uid);
 
@@ -223,16 +223,16 @@ class Handler_Public extends Handler {
 	}
 
 	function getProfiles() {
-		$login = db_escape_string($_REQUEST["login"]);
+		$login = $this->dbh->escape_string($_REQUEST["login"]);
 
-		$result = db_query("SELECT * FROM ttrss_settings_profiles,ttrss_users
+		$result = $this->dbh->query("SELECT * FROM ttrss_settings_profiles,ttrss_users
 			WHERE ttrss_users.id = ttrss_settings_profiles.owner_uid AND login = '$login' ORDER BY title");
 
 		print "<select dojoType='dijit.form.Select' style='width : 220px; margin : 0px' name='profile'>";
 
 		print "<option value='0'>" . __("Default profile") . "</option>";
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$id = $line["id"];
 			$title = $line["title"];
 
@@ -243,9 +243,9 @@ class Handler_Public extends Handler {
 	}
 
 	function pubsub() {
-		$mode = db_escape_string($_REQUEST['hub_mode']);
-		$feed_id = (int) db_escape_string($_REQUEST['id']);
-		$feed_url = db_escape_string($_REQUEST['hub_topic']);
+		$mode = $this->dbh->escape_string($_REQUEST['hub_mode']);
+		$feed_id = (int) $this->dbh->escape_string($_REQUEST['id']);
+		$feed_url = $this->dbh->escape_string($_REQUEST['hub_topic']);
 
 		if (!PUBSUBHUBBUB_ENABLED) {
 			header('HTTP/1.0 404 Not Found');
@@ -255,17 +255,17 @@ class Handler_Public extends Handler {
 
 		// TODO: implement hub_verifytoken checking
 
-		$result = db_query("SELECT feed_url FROM ttrss_feeds
+		$result = $this->dbh->query("SELECT feed_url FROM ttrss_feeds
 			WHERE id = '$feed_id'");
 
-		if (db_num_rows($result) != 0) {
+		if ($this->dbh->num_rows($result) != 0) {
 
-			$check_feed_url = db_fetch_result($result, 0, "feed_url");
+			$check_feed_url = $this->dbh->fetch_result($result, 0, "feed_url");
 
 			if ($check_feed_url && ($check_feed_url == $feed_url || !$feed_url)) {
 				if ($mode == "subscribe") {
 
-					db_query("UPDATE ttrss_feeds SET pubsub_state = 2
+					$this->dbh->query("UPDATE ttrss_feeds SET pubsub_state = 2
 						WHERE id = '$feed_id'");
 
 					print $_REQUEST['hub_challenge'];
@@ -273,7 +273,7 @@ class Handler_Public extends Handler {
 
 				} else if ($mode == "unsubscribe") {
 
-					db_query("UPDATE ttrss_feeds SET pubsub_state = 0
+					$this->dbh->query("UPDATE ttrss_feeds SET pubsub_state = 0
 						WHERE id = '$feed_id'");
 
 					print $_REQUEST['hub_challenge'];
@@ -284,7 +284,7 @@ class Handler_Public extends Handler {
 					// Received update ping, schedule feed update.
 					//update_rss_feed($feed_id, true, true);
 
-					db_query("UPDATE ttrss_feeds SET
+					$this->dbh->query("UPDATE ttrss_feeds SET
 						last_update_started = '1970-01-01',
 						last_updated = '1970-01-01' WHERE id = '$feed_id'");
 
@@ -306,16 +306,16 @@ class Handler_Public extends Handler {
 	}
 
 	function share() {
-		$uuid = db_escape_string($_REQUEST["key"]);
+		$uuid = $this->dbh->escape_string($_REQUEST["key"]);
 
-		$result = db_query("SELECT ref_id, owner_uid FROM ttrss_user_entries WHERE
+		$result = $this->dbh->query("SELECT ref_id, owner_uid FROM ttrss_user_entries WHERE
 			uuid = '$uuid'");
 
-		if (db_num_rows($result) != 0) {
+		if ($this->dbh->num_rows($result) != 0) {
 			header("Content-Type: text/html");
 
-			$id = db_fetch_result($result, 0, "ref_id");
-			$owner_uid = db_fetch_result($result, 0, "owner_uid");
+			$id = $this->dbh->fetch_result($result, 0, "ref_id");
+			$owner_uid = $this->dbh->fetch_result($result, 0, "owner_uid");
 
 			$article = format_article($id, false, true, $owner_uid);
 
@@ -328,17 +328,17 @@ class Handler_Public extends Handler {
 	}
 
 	function rss() {
-		$feed = db_escape_string($_REQUEST["id"]);
-		$key = db_escape_string($_REQUEST["key"]);
+		$feed = $this->dbh->escape_string($_REQUEST["id"]);
+		$key = $this->dbh->escape_string($_REQUEST["key"]);
 		$is_cat = $_REQUEST["is_cat"] != false;
-		$limit = (int)db_escape_string($_REQUEST["limit"]);
-		$offset = (int)db_escape_string($_REQUEST["offset"]);
+		$limit = (int)$this->dbh->escape_string($_REQUEST["limit"]);
+		$offset = (int)$this->dbh->escape_string($_REQUEST["offset"]);
 
-		$search = db_escape_string($_REQUEST["q"]);
-		$search_mode = db_escape_string($_REQUEST["smode"]);
-		$view_mode = db_escape_string($_REQUEST["view-mode"]);
+		$search = $this->dbh->escape_string($_REQUEST["q"]);
+		$search_mode = $this->dbh->escape_string($_REQUEST["smode"]);
+		$view_mode = $this->dbh->escape_string($_REQUEST["view-mode"]);
 
-		$format = db_escape_string($_REQUEST['format']);
+		$format = $this->dbh->escape_string($_REQUEST['format']);
 
 		if (!$format) $format = 'atom';
 
@@ -349,11 +349,11 @@ class Handler_Public extends Handler {
 		$owner_id = false;
 
 		if ($key) {
-			$result = db_query("SELECT owner_uid FROM
+			$result = $this->dbh->query("SELECT owner_uid FROM
 				ttrss_access_keys WHERE access_key = '$key' AND feed_id = '$feed'");
 
-			if (db_num_rows($result) == 1)
-				$owner_id = db_fetch_result($result, 0, "owner_uid");
+			if ($this->dbh->num_rows($result) == 1)
+				$owner_id = $this->dbh->fetch_result($result, 0, "owner_uid");
 		}
 
 		if ($owner_id) {
@@ -402,10 +402,10 @@ class Handler_Public extends Handler {
 
 			if ($action == 'share') {
 
-				$title = db_escape_string(strip_tags($_REQUEST["title"]));
-				$url = db_escape_string(strip_tags($_REQUEST["url"]));
-				$content = db_escape_string(strip_tags($_REQUEST["content"]));
-				$labels = db_escape_string(strip_tags($_REQUEST["labels"]));
+				$title = $this->dbh->escape_string(strip_tags($_REQUEST["title"]));
+				$url = $this->dbh->escape_string(strip_tags($_REQUEST["url"]));
+				$content = $this->dbh->escape_string(strip_tags($_REQUEST["content"]));
+				$labels = $this->dbh->escape_string(strip_tags($_REQUEST["labels"]));
 
 				Article::create_published_article($title, $url, $content, $labels,
 					$_SESSION["uid"]);
@@ -513,7 +513,7 @@ class Handler_Public extends Handler {
 
 		if (!SINGLE_USER_MODE) {
 
-			$login = db_escape_string($_POST["login"]);
+			$login = $this->dbh->escape_string($_POST["login"]);
 			$password = $_POST["password"];
 			$remember_me = $_POST["remember_me"];
 
@@ -534,12 +534,12 @@ class Handler_Public extends Handler {
 
 				if ($_POST["profile"]) {
 
-					$profile = db_escape_string($_POST["profile"]);
+					$profile = $this->dbh->escape_string($_POST["profile"]);
 
-					$result = db_query("SELECT id FROM ttrss_settings_profiles
+					$result = $this->dbh->query("SELECT id FROM ttrss_settings_profiles
 						WHERE id = '$profile' AND owner_uid = " . $_SESSION["uid"]);
 
-					if (db_num_rows($result) != 0) {
+					if ($this->dbh->num_rows($result) != 0) {
 						$_SESSION["profile"] = $profile;
 						$_SESSION["prefs_cache"] = array();
 					}
@@ -563,7 +563,7 @@ class Handler_Public extends Handler {
 
 		if ($_SESSION["uid"]) {
 
-			$feed_url = db_escape_string(trim($_REQUEST["feed_url"]));
+			$feed_url = $this->dbh->escape_string(trim($_REQUEST["feed_url"]));
 
 			header('Content-Type: text/html; charset=utf-8');
 			print "<html>
@@ -625,10 +625,10 @@ class Handler_Public extends Handler {
 			$tt_uri = get_self_url_prefix();
 
 			if ($rc['code'] <= 2){
-				$result = db_query("SELECT id FROM ttrss_feeds WHERE
+				$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE
 					feed_url = '$feed_url' AND owner_uid = " . $_SESSION["uid"]);
 
-				$feed_id = db_fetch_result($result, 0, "id");
+				$feed_id = $this->dbh->fetch_result($result, 0, "id");
 			} else {
 				$feed_id = 0;
 			}
@@ -656,14 +656,14 @@ class Handler_Public extends Handler {
 	}
 
 	function subscribe2() {
-		$feed_url = db_escape_string(trim($_REQUEST["feed_url"]));
-		$cat_id = db_escape_string($_REQUEST["cat_id"]);
-		$from = db_escape_string($_REQUEST["from"]);
+		$feed_url = $this->dbh->escape_string(trim($_REQUEST["feed_url"]));
+		$cat_id = $this->dbh->escape_string($_REQUEST["cat_id"]);
+		$from = $this->dbh->escape_string($_REQUEST["from"]);
 
 		/* only read authentication information from POST */
 
-		$auth_login = db_escape_string(trim($_POST["auth_login"]));
-		$auth_pass = db_escape_string(trim($_POST["auth_pass"]));
+		$auth_login = $this->dbh->escape_string(trim($_POST["auth_login"]));
+		$auth_pass = $this->dbh->escape_string(trim($_POST["auth_pass"]));
 
 		$rc = subscribe_to_feed($feed_url, $cat_id, $auth_login, $auth_pass);
 
@@ -712,10 +712,10 @@ class Handler_Public extends Handler {
 		$tt_uri = get_self_url_prefix();
 
 		if ($rc <= 2){
-			$result = db_query("SELECT id FROM ttrss_feeds WHERE
+			$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE
 				feed_url = '$feed_url' AND owner_uid = " . $_SESSION["uid"]);
 
-			$feed_id = db_fetch_result($result, 0, "id");
+			$feed_id = $this->dbh->fetch_result($result, 0, "id");
 		} else {
 			$feed_id = 0;
 		}
@@ -788,9 +788,9 @@ class Handler_Public extends Handler {
 			print "</form>";
 		} else if ($method == 'do') {
 
-			$login = db_escape_string($_POST["login"]);
-			$email = db_escape_string($_POST["email"]);
-			$test = db_escape_string($_POST["test"]);
+			$login = $this->dbh->escape_string($_POST["login"]);
+			$email = $this->dbh->escape_string($_POST["email"]);
+			$test = $this->dbh->escape_string($_POST["test"]);
 
 			if (($test != 4 && $test != 'four') || !$email || !$login) {
 				print_error(__('Some of the required form parameters are missing or incorrect.'));
@@ -802,11 +802,11 @@ class Handler_Public extends Handler {
 
 			} else {
 
-				$result = db_query("SELECT id FROM ttrss_users
+				$result = $this->dbh->query("SELECT id FROM ttrss_users
 					WHERE login = '$login' AND email = '$email'");
 
-				if (db_num_rows($result) != 0) {
-					$id = db_fetch_result($result, 0, "id");
+				if ($this->dbh->num_rows($result) != 0) {
+					$id = $this->dbh->fetch_result($result, 0, "id");
 
 					Pref_Users::resetUserPassword($id, false);
 
diff --git a/classes/logger/sql.php b/classes/logger/sql.php
index 888ef67dd..4d1f12065 100644
--- a/classes/logger/sql.php
+++ b/classes/logger/sql.php
@@ -12,7 +12,7 @@ class Logger_SQL {
 			$file = Db::get()->escape_string($file);
 			$line = Db::get()->escape_string($line);
 			$context = ''; // backtrace is a lot of data which is not really critical to store
-			//$context = db_escape_string(serialize($context));
+			//$context = $this->dbh->escape_string(serialize($context));
 
 			$owner_uid = $_SESSION["uid"] ? $_SESSION["uid"] : "NULL";
 
diff --git a/classes/opml.php b/classes/opml.php
index 986386378..3f4030dea 100644
--- a/classes/opml.php
+++ b/classes/opml.php
@@ -66,27 +66,27 @@ class Opml extends Handler_Protected {
 		$out = "";
 
 		if ($cat_id) {
-			$result = db_query("SELECT title FROM ttrss_feed_categories WHERE id = '$cat_id'
+			$result = $this->dbh->query("SELECT title FROM ttrss_feed_categories WHERE id = '$cat_id'
 				AND owner_uid = '$owner_uid'");
-			$cat_title = htmlspecialchars(db_fetch_result($result, 0, "title"));
+			$cat_title = htmlspecialchars($this->dbh->fetch_result($result, 0, "title"));
 		}
 
 		if ($cat_title) $out .= "<outline text=\"$cat_title\">\n";
 
-		$result = db_query("SELECT id,title
+		$result = $this->dbh->query("SELECT id,title
 			FROM ttrss_feed_categories WHERE
 			$cat_qpart AND owner_uid = '$owner_uid' ORDER BY order_id, title");
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$title = htmlspecialchars($line["title"]);
 			$out .= $this->opml_export_category($owner_uid, $line["id"], $hide_private_feeds);
 		}
 
-		$feeds_result = db_query("select title, feed_url, site_url
+		$feeds_result = $this->dbh->query("select title, feed_url, site_url
 				from ttrss_feeds where $feed_cat_qpart AND owner_uid = '$owner_uid' AND $hide_qpart
 				order by order_id, title");
 
-		while ($fline = db_fetch_assoc($feeds_result)) {
+		while ($fline = $this->dbh->fetch_assoc($feeds_result)) {
 			$title = htmlspecialchars($fline["title"]);
 			$url = htmlspecialchars($fline["feed_url"]);
 			$site_url = htmlspecialchars($fline["site_url"]);
@@ -131,10 +131,10 @@ class Opml extends Handler_Protected {
 		if ($include_settings) {
 			$out .= "<outline text=\"tt-rss-prefs\" schema-version=\"".SCHEMA_VERSION."\">";
 
-			$result = db_query("SELECT pref_name, value FROM ttrss_user_prefs WHERE
+			$result = $this->dbh->query("SELECT pref_name, value FROM ttrss_user_prefs WHERE
 			   profile IS NULL AND owner_uid = " . $_SESSION["uid"] . " ORDER BY pref_name");
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 				$name = $line["pref_name"];
 				$value = htmlspecialchars($line["value"]);
 
@@ -145,10 +145,10 @@ class Opml extends Handler_Protected {
 
 			$out .= "<outline text=\"tt-rss-labels\" schema-version=\"".SCHEMA_VERSION."\">";
 
-			$result = db_query("SELECT * FROM ttrss_labels2 WHERE
+			$result = $this->dbh->query("SELECT * FROM ttrss_labels2 WHERE
 				owner_uid = " . $_SESSION['uid']);
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 				$name = htmlspecialchars($line['caption']);
 				$fg_color = htmlspecialchars($line['fg_color']);
 				$bg_color = htmlspecialchars($line['bg_color']);
@@ -161,10 +161,10 @@ class Opml extends Handler_Protected {
 
 			$out .= "<outline text=\"tt-rss-filters\" schema-version=\"".SCHEMA_VERSION."\">";
 
-			$result = db_query("SELECT * FROM ttrss_filters2
+			$result = $this->dbh->query("SELECT * FROM ttrss_filters2
 				WHERE owner_uid = ".$_SESSION["uid"]." ORDER BY id");
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 				foreach (array('enabled', 'match_any_rule') as $b) {
 					$line[$b] = sql_bool_to_bool($line[$b]);
 				}
@@ -172,10 +172,10 @@ class Opml extends Handler_Protected {
 				$line["rules"] = array();
 				$line["actions"] = array();
 
-				$tmp_result = db_query("SELECT * FROM ttrss_filters2_rules
+				$tmp_result = $this->dbh->query("SELECT * FROM ttrss_filters2_rules
 					WHERE filter_id = ".$line["id"]);
 
-				while ($tmp_line = db_fetch_assoc($tmp_result)) {
+				while ($tmp_line = $this->dbh->fetch_assoc($tmp_result)) {
 					unset($tmp_line["id"]);
 					unset($tmp_line["filter_id"]);
 
@@ -197,10 +197,10 @@ class Opml extends Handler_Protected {
 					array_push($line["rules"], $tmp_line);
 				}
 
-				$tmp_result = db_query("SELECT * FROM ttrss_filters2_actions
+				$tmp_result = $this->dbh->query("SELECT * FROM ttrss_filters2_actions
 					WHERE filter_id = ".$line["id"]);
 
-				while ($tmp_line = db_fetch_assoc($tmp_result)) {
+				while ($tmp_line = $this->dbh->fetch_assoc($tmp_result)) {
 					unset($tmp_line["id"]);
 					unset($tmp_line["filter_id"]);
 
@@ -253,19 +253,19 @@ class Opml extends Handler_Protected {
 	private function opml_import_feed($doc, $node, $cat_id, $owner_uid) {
 		$attrs = $node->attributes;
 
-		$feed_title = db_escape_string(mb_substr($attrs->getNamedItem('text')->nodeValue, 0, 250));
-		if (!$feed_title) $feed_title = db_escape_string(mb_substr($attrs->getNamedItem('title')->nodeValue, 0, 250));
+		$feed_title = $this->dbh->escape_string(mb_substr($attrs->getNamedItem('text')->nodeValue, 0, 250));
+		if (!$feed_title) $feed_title = $this->dbh->escape_string(mb_substr($attrs->getNamedItem('title')->nodeValue, 0, 250));
 
-		$feed_url = db_escape_string(mb_substr($attrs->getNamedItem('xmlUrl')->nodeValue, 0, 250));
-		if (!$feed_url) $feed_url = db_escape_string(mb_substr($attrs->getNamedItem('xmlURL')->nodeValue, 0, 250));
+		$feed_url = $this->dbh->escape_string(mb_substr($attrs->getNamedItem('xmlUrl')->nodeValue, 0, 250));
+		if (!$feed_url) $feed_url = $this->dbh->escape_string(mb_substr($attrs->getNamedItem('xmlURL')->nodeValue, 0, 250));
 
-		$site_url = db_escape_string(mb_substr($attrs->getNamedItem('htmlUrl')->nodeValue, 0, 250));
+		$site_url = $this->dbh->escape_string(mb_substr($attrs->getNamedItem('htmlUrl')->nodeValue, 0, 250));
 
 		if ($feed_url && $feed_title) {
-			$result = db_query("SELECT id FROM ttrss_feeds WHERE
+			$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE
 				feed_url = '$feed_url' AND owner_uid = '$owner_uid'");
 
-			if (db_num_rows($result) == 0) {
+			if ($this->dbh->num_rows($result) == 0) {
 				#$this->opml_notice("[FEED] [$feed_title/$feed_url] dst_CAT=$cat_id");
 				$this->opml_notice(T_sprintf("Adding feed: %s", $feed_title));
 
@@ -275,7 +275,7 @@ class Opml extends Handler_Protected {
 					(title, feed_url, owner_uid, cat_id, site_url, order_id) VALUES
 					('$feed_title', '$feed_url', '$owner_uid',
 					$cat_id, '$site_url', 0)";
-				db_query($query);
+				$this->dbh->query($query);
 
 			} else {
 				$this->opml_notice(T_sprintf("Duplicate feed: %s", $feed_title));
@@ -285,11 +285,11 @@ class Opml extends Handler_Protected {
 
 	private function opml_import_label($doc, $node, $owner_uid) {
 		$attrs = $node->attributes;
-		$label_name = db_escape_string($attrs->getNamedItem('label-name')->nodeValue);
+		$label_name = $this->dbh->escape_string($attrs->getNamedItem('label-name')->nodeValue);
 
 		if ($label_name) {
-			$fg_color = db_escape_string($attrs->getNamedItem('label-fg-color')->nodeValue);
-			$bg_color = db_escape_string($attrs->getNamedItem('label-bg-color')->nodeValue);
+			$fg_color = $this->dbh->escape_string($attrs->getNamedItem('label-fg-color')->nodeValue);
+			$bg_color = $this->dbh->escape_string($attrs->getNamedItem('label-bg-color')->nodeValue);
 
 			if (!label_find_id($label_name, $_SESSION['uid'])) {
 				$this->opml_notice(T_sprintf("Adding label %s", htmlspecialchars($label_name)));
@@ -302,10 +302,10 @@ class Opml extends Handler_Protected {
 
 	private function opml_import_preference($doc, $node, $owner_uid) {
 		$attrs = $node->attributes;
-		$pref_name = db_escape_string($attrs->getNamedItem('pref-name')->nodeValue);
+		$pref_name = $this->dbh->escape_string($attrs->getNamedItem('pref-name')->nodeValue);
 
 		if ($pref_name) {
-			$pref_value = db_escape_string($attrs->getNamedItem('value')->nodeValue);
+			$pref_value = $this->dbh->escape_string($attrs->getNamedItem('value')->nodeValue);
 
 			$this->opml_notice(T_sprintf("Setting preference key %s to %s",
 				$pref_name, $pref_value));
@@ -317,7 +317,7 @@ class Opml extends Handler_Protected {
 	private function opml_import_filter($doc, $node, $owner_uid) {
 		$attrs = $node->attributes;
 
-		$filter_type = db_escape_string($attrs->getNamedItem('filter-type')->nodeValue);
+		$filter_type = $this->dbh->escape_string($attrs->getNamedItem('filter-type')->nodeValue);
 
 		if ($filter_type == '2') {
 			$filter = json_decode($node->nodeValue, true);
@@ -326,14 +326,14 @@ class Opml extends Handler_Protected {
 				$match_any_rule = bool_to_sql_bool($filter["match_any_rule"]);
 				$enabled = bool_to_sql_bool($filter["enabled"]);
 
-				db_query("BEGIN");
+				$this->dbh->query("BEGIN");
 
-				db_query("INSERT INTO ttrss_filters2 (match_any_rule,enabled,owner_uid)
+				$this->dbh->query("INSERT INTO ttrss_filters2 (match_any_rule,enabled,owner_uid)
 					VALUES ($match_any_rule, $enabled,".$_SESSION["uid"].")");
 
-				$result = db_query("SELECT MAX(id) AS id FROM ttrss_filters2 WHERE
+				$result = $this->dbh->query("SELECT MAX(id) AS id FROM ttrss_filters2 WHERE
 					owner_uid = ".$_SESSION["uid"]);
-				$filter_id = db_fetch_result($result, 0, "id");
+				$filter_id = $this->dbh->fetch_result($result, 0, "id");
 
 				if ($filter_id) {
 					$this->opml_notice(T_sprintf("Adding filter..."));
@@ -343,39 +343,39 @@ class Opml extends Handler_Protected {
 						$cat_id = "NULL";
 
 						if (!$rule["cat_filter"]) {
-							$tmp_result = db_query("SELECT id FROM ttrss_feeds
-								WHERE title = '".db_escape_string($rule["feed"])."' AND owner_uid = ".$_SESSION["uid"]);
-							if (db_num_rows($tmp_result) > 0) {
-								$feed_id = db_fetch_result($tmp_result, 0, "id");
+							$tmp_result = $this->dbh->query("SELECT id FROM ttrss_feeds
+								WHERE title = '".$this->dbh->escape_string($rule["feed"])."' AND owner_uid = ".$_SESSION["uid"]);
+							if ($this->dbh->num_rows($tmp_result) > 0) {
+								$feed_id = $this->dbh->fetch_result($tmp_result, 0, "id");
 							}
 						} else {
-							$tmp_result = db_query("SELECT id FROM ttrss_feed_categories
-								WHERE title = '".db_escape_string($rule["feed"])."' AND owner_uid = ".$_SESSION["uid"]);
+							$tmp_result = $this->dbh->query("SELECT id FROM ttrss_feed_categories
+								WHERE title = '".$this->dbh->escape_string($rule["feed"])."' AND owner_uid = ".$_SESSION["uid"]);
 
-							if (db_num_rows($tmp_result) > 0) {
-								$cat_id = db_fetch_result($tmp_result, 0, "id");
+							if ($this->dbh->num_rows($tmp_result) > 0) {
+								$cat_id = $this->dbh->fetch_result($tmp_result, 0, "id");
 							}
 						}
 
 						$cat_filter = bool_to_sql_bool($rule["cat_filter"]);
-						$reg_exp = db_escape_string($rule["reg_exp"]);
+						$reg_exp = $this->dbh->escape_string($rule["reg_exp"]);
 						$filter_type = (int)$rule["filter_type"];
 
-						db_query("INSERT INTO ttrss_filters2_rules (feed_id,cat_id,filter_id,filter_type,reg_exp,cat_filter)
+						$this->dbh->query("INSERT INTO ttrss_filters2_rules (feed_id,cat_id,filter_id,filter_type,reg_exp,cat_filter)
 							VALUES ($feed_id, $cat_id, $filter_id, $filter_type, '$reg_exp', $cat_filter)");
 					}
 
 					foreach ($filter["actions"] as $action) {
 
 						$action_id = (int)$action["action_id"];
-						$action_param = db_escape_string($action["action_param"]);
+						$action_param = $this->dbh->escape_string($action["action_param"]);
 
-						db_query("INSERT INTO ttrss_filters2_actions (filter_id,action_id,action_param)
+						$this->dbh->query("INSERT INTO ttrss_filters2_actions (filter_id,action_id,action_param)
 							VALUES ($filter_id, $action_id, '$action_param')");
 					}
 				}
 
-				db_query("COMMIT");
+				$this->dbh->query("COMMIT");
 			}
 		}
 	}
@@ -386,19 +386,19 @@ class Opml extends Handler_Protected {
 		$default_cat_id = (int) get_feed_category('Imported feeds', false);
 
 		if ($root_node) {
-			$cat_title = db_escape_string(mb_substr($root_node->attributes->getNamedItem('text')->nodeValue, 0, 250));
+			$cat_title = $this->dbh->escape_string(mb_substr($root_node->attributes->getNamedItem('text')->nodeValue, 0, 250));
 
 			if (!$cat_title)
-				$cat_title = db_escape_string(mb_substr($root_node->attributes->getNamedItem('title')->nodeValue, 0, 250));
+				$cat_title = $this->dbh->escape_string(mb_substr($root_node->attributes->getNamedItem('title')->nodeValue, 0, 250));
 
 			if (!in_array($cat_title, array("tt-rss-filters", "tt-rss-labels", "tt-rss-prefs"))) {
 				$cat_id = get_feed_category($cat_title, $parent_id);
-				db_query("BEGIN");
+				$this->dbh->query("BEGIN");
 				if ($cat_id === false) {
 					add_feed_category($cat_title, $parent_id);
 					$cat_id = get_feed_category($cat_title, $parent_id);
 				}
-				db_query("COMMIT");
+				$this->dbh->query("COMMIT");
 			} else {
 				$cat_id = 0;
 			}
@@ -418,12 +418,12 @@ class Opml extends Handler_Protected {
 		foreach ($outlines as $node) {
 			if ($node->hasAttributes() && strtolower($node->tagName) == "outline") {
 				$attrs = $node->attributes;
-				$node_cat_title = db_escape_string($attrs->getNamedItem('text')->nodeValue);
+				$node_cat_title = $this->dbh->escape_string($attrs->getNamedItem('text')->nodeValue);
 
 				if (!$node_cat_title)
-					$node_cat_title = db_escape_string($attrs->getNamedItem('title')->nodeValue);
+					$node_cat_title = $this->dbh->escape_string($attrs->getNamedItem('title')->nodeValue);
 
-				$node_feed_url = db_escape_string($attrs->getNamedItem('xmlUrl')->nodeValue);
+				$node_feed_url = $this->dbh->escape_string($attrs->getNamedItem('xmlUrl')->nodeValue);
 
 				if ($node_cat_title && !$node_feed_url) {
 					$this->opml_import_category($doc, $node, $owner_uid, $cat_id);
diff --git a/classes/pluginhost.php b/classes/pluginhost.php
index 0fbf0422e..c10f789b5 100644
--- a/classes/pluginhost.php
+++ b/classes/pluginhost.php
@@ -222,12 +222,12 @@ class PluginHost {
 
 	function load_data($force = false) {
 		if ($this->owner_uid && (!$_SESSION["plugin_storage"] || $force))  {
-			$plugin = db_escape_string($plugin);
+			$plugin = $this->dbh->escape_string($plugin);
 
-			$result = db_query("SELECT name, content FROM ttrss_plugin_storage
+			$result = $this->dbh->query("SELECT name, content FROM ttrss_plugin_storage
 				WHERE owner_uid = '".$this->owner_uid."'");
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 				$this->storage[$line["name"]] = unserialize($line["content"]);
 			}
 
@@ -237,29 +237,29 @@ class PluginHost {
 
 	private function save_data($plugin) {
 		if ($this->owner_uid) {
-			$plugin = db_escape_string($plugin);
+			$plugin = $this->dbh->escape_string($plugin);
 
-			db_query("BEGIN");
+			$this->dbh->query("BEGIN");
 
-			$result = db_query("SELECT id FROM ttrss_plugin_storage WHERE
+			$result = $this->dbh->query("SELECT id FROM ttrss_plugin_storage WHERE
 				owner_uid= '".$this->owner_uid."' AND name = '$plugin'");
 
 			if (!isset($this->storage[$plugin]))
 				$this->storage[$plugin] = array();
 
-			$content = db_escape_string(serialize($this->storage[$plugin]));
+			$content = $this->dbh->escape_string(serialize($this->storage[$plugin]));
 
-			if (db_num_rows($result) != 0) {
-				db_query("UPDATE ttrss_plugin_storage SET content = '$content'
+			if ($this->dbh->num_rows($result) != 0) {
+				$this->dbh->query("UPDATE ttrss_plugin_storage SET content = '$content'
 					WHERE owner_uid= '".$this->owner_uid."' AND name = '$plugin'");
 
 			} else {
-				db_query("INSERT INTO ttrss_plugin_storage
+				$this->dbh->query("INSERT INTO ttrss_plugin_storage
 					(name,owner_uid,content) VALUES
 					('$plugin','".$this->owner_uid."','$content')");
 			}
 
-			db_query("COMMIT");
+			$this->dbh->query("COMMIT");
 		}
 	}
 
@@ -298,7 +298,7 @@ class PluginHost {
 
 			unset($this->storage[$idx]);
 
-			db_query("DELETE FROM ttrss_plugin_storage WHERE name = '$idx'
+			$this->dbh->query("DELETE FROM ttrss_plugin_storage WHERE name = '$idx'
 				AND owner_uid = " . $this->owner_uid);
 
 			$_SESSION["plugin_storage"] = $this->storage;
diff --git a/classes/pref/feeds.php b/classes/pref/feeds.php
index 970b88822..054ea4e8c 100644
--- a/classes/pref/feeds.php
+++ b/classes/pref/feeds.php
@@ -15,11 +15,11 @@ class Pref_Feeds extends Handler_Protected {
 	}
 
 	function renamecat() {
-		$title = db_escape_string($_REQUEST['title']);
-		$id = db_escape_string($_REQUEST['id']);
+		$title = $this->dbh->escape_string($_REQUEST['title']);
+		$id = $this->dbh->escape_string($_REQUEST['id']);
 
 		if ($title) {
-			db_query("UPDATE ttrss_feed_categories SET
+			$this->dbh->query("UPDATE ttrss_feed_categories SET
 				title = '$title' WHERE id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 		}
 		return;
@@ -41,10 +41,10 @@ class Pref_Feeds extends Handler_Protected {
 
 		$items = array();
 
-		$result = db_query("SELECT id, title FROM ttrss_feed_categories
+		$result = $this->dbh->query("SELECT id, title FROM ttrss_feed_categories
 				WHERE owner_uid = " . $_SESSION["uid"] . " AND parent_cat = '$cat_id' ORDER BY order_id, title");
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 
 			$cat = array();
 			$cat['id'] = 'CAT:' . $line['id'];
@@ -65,13 +65,13 @@ class Pref_Feeds extends Handler_Protected {
 
 		}
 
-		$feed_result = db_query("SELECT id, title, last_error,
+		$feed_result = $this->dbh->query("SELECT id, title, last_error,
 			".SUBSTRING_FOR_DATE."(last_updated,1,19) AS last_updated
 			FROM ttrss_feeds
 			WHERE cat_id = '$cat_id' AND owner_uid = ".$_SESSION["uid"].
 			"$search_qpart ORDER BY order_id, title");
 
-		while ($feed_line = db_fetch_assoc($feed_result)) {
+		while ($feed_line = $this->dbh->fetch_assoc($feed_result)) {
 			$feed = array();
 			$feed['id'] = 'FEED:' . $feed_line['id'];
 			$feed['bare_id'] = (int)$feed_line['id'];
@@ -154,10 +154,10 @@ class Pref_Feeds extends Handler_Protected {
 				$root['items'] = array_merge($root['items'], $cat['items']);
 			}
 
-			$result = db_query("SELECT * FROM
+			$result = $this->dbh->query("SELECT * FROM
 				ttrss_labels2 WHERE owner_uid = ".$_SESSION['uid']." ORDER by caption");
 
-			if (db_num_rows($result) > 0) {
+			if ($this->dbh->num_rows($result) > 0) {
 
 				if (get_pref('ENABLE_FEED_CATS')) {
 					$cat = $this->feedlist_init_cat(-2);
@@ -165,7 +165,7 @@ class Pref_Feeds extends Handler_Protected {
 					$cat['items'] = array();
 				}
 
-				while ($line = db_fetch_assoc($result)) {
+				while ($line = $this->dbh->fetch_assoc($result)) {
 
 					$label_id = label_to_feed_id($line['id']);
 
@@ -190,10 +190,10 @@ class Pref_Feeds extends Handler_Protected {
 				($_REQUEST['mode'] != 2 && !$search &&
 				get_pref('_PREFS_SHOW_EMPTY_CATS'));
 
-			$result = db_query("SELECT id, title FROM ttrss_feed_categories
+			$result = $this->dbh->query("SELECT id, title FROM ttrss_feed_categories
 				WHERE owner_uid = " . $_SESSION["uid"] . " AND parent_cat IS NULL ORDER BY order_id, title");
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 				$cat = array();
 				$cat['id'] = 'CAT:' . $line['id'];
 				$cat['bare_id'] = (int)$line['id'];
@@ -226,13 +226,13 @@ class Pref_Feeds extends Handler_Protected {
 			$cat['unread'] = 0;
 			$cat['child_unread'] = 0;
 
-			$feed_result = db_query("SELECT id, title,last_error,
+			$feed_result = $this->dbh->query("SELECT id, title,last_error,
 				".SUBSTRING_FOR_DATE."(last_updated,1,19) AS last_updated
 				FROM ttrss_feeds
 				WHERE cat_id IS NULL AND owner_uid = ".$_SESSION["uid"].
 				"$search_qpart ORDER BY order_id, title");
 
-			while ($feed_line = db_fetch_assoc($feed_result)) {
+			while ($feed_line = $this->dbh->fetch_assoc($feed_result)) {
 				$feed = array();
 				$feed['id'] = 'FEED:' . $feed_line['id'];
 				$feed['bare_id'] = (int)$feed_line['id'];
@@ -257,13 +257,13 @@ class Pref_Feeds extends Handler_Protected {
 			$root['param'] = vsprintf(_ngettext('(%d feed)', '(%d feeds)', count($cat['items'])), count($cat['items']));
 
 		} else {
-			$feed_result = db_query("SELECT id, title, last_error,
+			$feed_result = $this->dbh->query("SELECT id, title, last_error,
 				".SUBSTRING_FOR_DATE."(last_updated,1,19) AS last_updated
 				FROM ttrss_feeds
 				WHERE owner_uid = ".$_SESSION["uid"].
 				"$search_qpart ORDER BY order_id, title");
 
-			while ($feed_line = db_fetch_assoc($feed_result)) {
+			while ($feed_line = $this->dbh->fetch_assoc($feed_result)) {
 				$feed = array();
 				$feed['id'] = 'FEED:' . $feed_line['id'];
 				$feed['bare_id'] = (int)$feed_line['id'];
@@ -296,13 +296,13 @@ class Pref_Feeds extends Handler_Protected {
 	}
 
 	function catsortreset() {
-		db_query("UPDATE ttrss_feed_categories
+		$this->dbh->query("UPDATE ttrss_feed_categories
 				SET order_id = 0 WHERE owner_uid = " . $_SESSION["uid"]);
 		return;
 	}
 
 	function feedsortreset() {
-		db_query("UPDATE ttrss_feeds
+		$this->dbh->query("UPDATE ttrss_feeds
 				SET order_id = 0 WHERE owner_uid = " . $_SESSION["uid"]);
 		return;
 	}
@@ -326,12 +326,12 @@ class Pref_Feeds extends Handler_Protected {
 		if ($item_id != 'root') {
 			if ($parent_id && $parent_id != 'root') {
 				$parent_bare_id = substr($parent_id, strpos($parent_id, ':')+1);
-				$parent_qpart = db_escape_string($parent_bare_id);
+				$parent_qpart = $this->dbh->escape_string($parent_bare_id);
 			} else {
 				$parent_qpart = 'NULL';
 			}
 
-			db_query("UPDATE ttrss_feed_categories
+			$this->dbh->query("UPDATE ttrss_feed_categories
 				SET parent_cat = $parent_qpart WHERE id = '$bare_item_id' AND
 				owner_uid = " . $_SESSION["uid"]);
 		}
@@ -352,12 +352,12 @@ class Pref_Feeds extends Handler_Protected {
 					if (strpos($id, "FEED") === 0) {
 
 						$cat_id = ($item_id != "root") ?
-							db_escape_string($bare_item_id) : "NULL";
+							$this->dbh->escape_string($bare_item_id) : "NULL";
 
 						$cat_qpart = ($cat_id != 0) ? "cat_id = '$cat_id'" :
 							"cat_id = NULL";
 
-						db_query("UPDATE ttrss_feeds
+						$this->dbh->query("UPDATE ttrss_feeds
 							SET order_id = $order_id, $cat_qpart
 							WHERE id = '$bare_id' AND
 								owner_uid = " . $_SESSION["uid"]);
@@ -367,12 +367,12 @@ class Pref_Feeds extends Handler_Protected {
 							$nest_level+1);
 
 						if ($item_id != 'root') {
-							$parent_qpart = db_escape_string($bare_id);
+							$parent_qpart = $this->dbh->escape_string($bare_id);
 						} else {
 							$parent_qpart = 'NULL';
 						}
 
-						db_query("UPDATE ttrss_feed_categories
+						$this->dbh->query("UPDATE ttrss_feed_categories
 								SET order_id = '$order_id' WHERE id = '$bare_id' AND
 								owner_uid = " . $_SESSION["uid"]);
 					}
@@ -424,7 +424,7 @@ class Pref_Feeds extends Handler_Protected {
 				++$cat_order_id;
 
 				if ($bare_id > 0) {
-					db_query("UPDATE ttrss_feed_categories
+					$this->dbh->query("UPDATE ttrss_feed_categories
 						SET order_id = '$cat_order_id' WHERE id = '$bare_id' AND
 						owner_uid = " . $_SESSION["uid"]);
 				}
@@ -441,7 +441,7 @@ class Pref_Feeds extends Handler_Protected {
 						else
 							$cat_query = "cat_id = NULL";
 
-						db_query("UPDATE ttrss_feeds
+						$this->dbh->query("UPDATE ttrss_feeds
 							SET order_id = '$feed_order_id',
 							$cat_query
 							WHERE id = '$feed_id' AND
@@ -457,15 +457,15 @@ class Pref_Feeds extends Handler_Protected {
 	}
 
 	function removeicon() {
-		$feed_id = db_escape_string($_REQUEST["feed_id"]);
+		$feed_id = $this->dbh->escape_string($_REQUEST["feed_id"]);
 
-		$result = db_query("SELECT id FROM ttrss_feeds
+		$result = $this->dbh->query("SELECT id FROM ttrss_feeds
 			WHERE id = '$feed_id' AND owner_uid = ". $_SESSION["uid"]);
 
-		if (db_num_rows($result) != 0) {
+		if ($this->dbh->num_rows($result) != 0) {
 			@unlink(ICONS_DIR . "/$feed_id.ico");
 
-			db_query("UPDATE ttrss_feeds SET favicon_avg_color = NULL
+			$this->dbh->query("UPDATE ttrss_feeds SET favicon_avg_color = NULL
 				where id = '$feed_id'");
 		}
 
@@ -491,24 +491,24 @@ class Pref_Feeds extends Handler_Protected {
 		}
 
 		$icon_file = $tmp_file;
-		$feed_id = db_escape_string($_REQUEST["feed_id"]);
+		$feed_id = $this->dbh->escape_string($_REQUEST["feed_id"]);
 
 		if (is_file($icon_file) && $feed_id) {
 			if (filesize($icon_file) < 20000) {
 
-				$result = db_query("SELECT id FROM ttrss_feeds
+				$result = $this->dbh->query("SELECT id FROM ttrss_feeds
 					WHERE id = '$feed_id' AND owner_uid = ". $_SESSION["uid"]);
 
-				if (db_num_rows($result) != 0) {
+				if ($this->dbh->num_rows($result) != 0) {
 					@unlink(ICONS_DIR . "/$feed_id.ico");
 					if (rename($icon_file, ICONS_DIR . "/$feed_id.ico")) {
 
 						require_once "colors.php";
 
-						$favicon_color = db_escape_string(
+						$favicon_color = $this->dbh->escape_string(
 							calculate_avg_color(ICONS_DIR . "/$feed_id.ico"));
 
-						db_query("UPDATE ttrss_feeds SET
+						$this->dbh->query("UPDATE ttrss_feeds SET
 							favicon_avg_color = '$favicon_color'
 							WHERE id = '$feed_id'");
 
@@ -536,16 +536,16 @@ class Pref_Feeds extends Handler_Protected {
 		global $purge_intervals;
 		global $update_intervals;
 
-		$feed_id = db_escape_string($_REQUEST["id"]);
+		$feed_id = $this->dbh->escape_string($_REQUEST["id"]);
 
-		$result = db_query(
+		$result = $this->dbh->query(
 			"SELECT * FROM ttrss_feeds WHERE id = '$feed_id' AND
 				owner_uid = " . $_SESSION["uid"]);
 
-		$auth_pass_encrypted = sql_bool_to_bool(db_fetch_result($result, 0,
+		$auth_pass_encrypted = sql_bool_to_bool($this->dbh->fetch_result($result, 0,
 			"auth_pass_encrypted"));
 
-		$title = htmlspecialchars(db_fetch_result($result,
+		$title = htmlspecialchars($this->dbh->fetch_result($result,
 			0, "title"));
 
 		print "<input dojoType=\"dijit.form.TextBox\" style=\"display : none\" name=\"id\" value=\"$feed_id\">";
@@ -563,8 +563,8 @@ class Pref_Feeds extends Handler_Protected {
 
 		/* Feed URL */
 
-		$feed_url = db_fetch_result($result, 0, "feed_url");
-		$feed_url = htmlspecialchars(db_fetch_result($result,
+		$feed_url = $this->dbh->fetch_result($result, 0, "feed_url");
+		$feed_url = htmlspecialchars($this->dbh->fetch_result($result,
 			0, "feed_url"));
 
 		print "<hr/>";
@@ -575,7 +575,7 @@ class Pref_Feeds extends Handler_Protected {
 			regExp='^(http|https)://.*' style=\"width : 20em\"
 			name=\"feed_url\" value=\"$feed_url\">";
 
-		$last_error = db_fetch_result($result, 0, "last_error");
+		$last_error = $this->dbh->fetch_result($result, 0, "last_error");
 
 		if ($last_error) {
 			print "&nbsp;<span title=\"".htmlspecialchars($last_error)."\"
@@ -587,7 +587,7 @@ class Pref_Feeds extends Handler_Protected {
 
 		if (get_pref('ENABLE_FEED_CATS')) {
 
-			$cat_id = db_fetch_result($result, 0, "cat_id");
+			$cat_id = $this->dbh->fetch_result($result, 0, "cat_id");
 
 			print "<hr/>";
 
@@ -604,14 +604,14 @@ class Pref_Feeds extends Handler_Protected {
 
 		/* Update Interval */
 
-		$update_interval = db_fetch_result($result, 0, "update_interval");
+		$update_interval = $this->dbh->fetch_result($result, 0, "update_interval");
 
 		print_select_hash("update_interval", $update_interval, $update_intervals,
 			'dojoType="dijit.form.Select"');
 
 		/* Purge intl */
 
-		$purge_interval = db_fetch_result($result, 0, "purge_interval");
+		$purge_interval = $this->dbh->fetch_result($result, 0, "purge_interval");
 
 		print "<hr/>";
 		print __('Article purging:') . " ";
@@ -624,13 +624,13 @@ class Pref_Feeds extends Handler_Protected {
 		print "<div class=\"dlgSec\">".__("Authentication")."</div>";
 		print "<div class=\"dlgSecCont\">";
 
-		$auth_login = htmlspecialchars(db_fetch_result($result, 0, "auth_login"));
+		$auth_login = htmlspecialchars($this->dbh->fetch_result($result, 0, "auth_login"));
 
 		print "<input dojoType=\"dijit.form.TextBox\" id=\"feedEditDlg_login\"
 			placeHolder=\"".__("Login")."\"
 			name=\"auth_login\" value=\"$auth_login\"><hr/>";
 
-		$auth_pass = db_fetch_result($result, 0, "auth_pass");
+		$auth_pass = $this->dbh->fetch_result($result, 0, "auth_pass");
 
 		if ($auth_pass_encrypted) {
 			require_once "crypt.php";
@@ -651,7 +651,7 @@ class Pref_Feeds extends Handler_Protected {
 		print "<div class=\"dlgSec\">".__("Options")."</div>";
 		print "<div class=\"dlgSecCont\">";
 
-		$private = sql_bool_to_bool(db_fetch_result($result, 0, "private"));
+		$private = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "private"));
 
 		if ($private) {
 			$checked = "checked=\"1\"";
@@ -662,7 +662,7 @@ class Pref_Feeds extends Handler_Protected {
 		print "<input dojoType=\"dijit.form.CheckBox\" type=\"checkbox\" name=\"private\" id=\"private\"
 			$checked>&nbsp;<label for=\"private\">".__('Hide from Popular feeds')."</label>";
 
-		$include_in_digest = sql_bool_to_bool(db_fetch_result($result, 0, "include_in_digest"));
+		$include_in_digest = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "include_in_digest"));
 
 		if ($include_in_digest) {
 			$checked = "checked=\"1\"";
@@ -675,7 +675,7 @@ class Pref_Feeds extends Handler_Protected {
 			$checked>&nbsp;<label for=\"include_in_digest\">".__('Include in e-mail digest')."</label>";
 
 
-		$always_display_enclosures = sql_bool_to_bool(db_fetch_result($result, 0, "always_display_enclosures"));
+		$always_display_enclosures = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "always_display_enclosures"));
 
 		if ($always_display_enclosures) {
 			$checked = "checked";
@@ -687,7 +687,7 @@ class Pref_Feeds extends Handler_Protected {
 			name=\"always_display_enclosures\"
 			$checked>&nbsp;<label for=\"always_display_enclosures\">".__('Always display image attachments')."</label>";
 
-		$hide_images = sql_bool_to_bool(db_fetch_result($result, 0, "hide_images"));
+		$hide_images = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "hide_images"));
 
 		if ($hide_images) {
 			$checked = "checked=\"1\"";
@@ -700,7 +700,7 @@ class Pref_Feeds extends Handler_Protected {
 			$checked>&nbsp;<label for=\"hide_images\">".
 		__('Do not embed images')."</label>";
 
-		$cache_images = sql_bool_to_bool(db_fetch_result($result, 0, "cache_images"));
+		$cache_images = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "cache_images"));
 
 		if ($cache_images) {
 			$checked = "checked=\"1\"";
@@ -713,7 +713,7 @@ class Pref_Feeds extends Handler_Protected {
 			$checked>&nbsp;<label for=\"cache_images\">".
 		__('Cache images locally')."</label>";
 
-		$mark_unread_on_update = sql_bool_to_bool(db_fetch_result($result, 0, "mark_unread_on_update"));
+		$mark_unread_on_update = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "mark_unread_on_update"));
 
 		if ($mark_unread_on_update) {
 			$checked = "checked";
@@ -758,7 +758,7 @@ class Pref_Feeds extends Handler_Protected {
 				__('Unsubscribe')."</button>";
 
 		if (PUBSUBHUBBUB_ENABLED) {
-			$pubsub_state = db_fetch_result($result, 0, "pubsub_state");
+			$pubsub_state = $this->dbh->fetch_result($result, 0, "pubsub_state");
 			$pubsub_btn_disabled = ($pubsub_state == 2) ? "" : "disabled=\"1\"";
 
 			print "<button dojoType=\"dijit.form.Button\" id=\"pubsubReset_Btn\" $pubsub_btn_disabled
@@ -782,7 +782,7 @@ class Pref_Feeds extends Handler_Protected {
 		global $purge_intervals;
 		global $update_intervals;
 
-		$feed_ids = db_escape_string($_REQUEST["ids"]);
+		$feed_ids = $this->dbh->escape_string($_REQUEST["ids"]);
 
 		print_notice("Enable the options you wish to apply using checkboxes on the right:");
 
@@ -938,27 +938,27 @@ class Pref_Feeds extends Handler_Protected {
 
 	function editsaveops($batch) {
 
-		$feed_title = db_escape_string(trim($_POST["title"]));
-		$feed_link = db_escape_string(trim($_POST["feed_url"]));
-		$upd_intl = (int) db_escape_string($_POST["update_interval"]);
-		$purge_intl = (int) db_escape_string($_POST["purge_interval"]);
-		$feed_id = (int) db_escape_string($_POST["id"]); /* editSave */
-		$feed_ids = db_escape_string($_POST["ids"]); /* batchEditSave */
-		$cat_id = (int) db_escape_string($_POST["cat_id"]);
-		$auth_login = db_escape_string(trim($_POST["auth_login"]));
+		$feed_title = $this->dbh->escape_string(trim($_POST["title"]));
+		$feed_link = $this->dbh->escape_string(trim($_POST["feed_url"]));
+		$upd_intl = (int) $this->dbh->escape_string($_POST["update_interval"]);
+		$purge_intl = (int) $this->dbh->escape_string($_POST["purge_interval"]);
+		$feed_id = (int) $this->dbh->escape_string($_POST["id"]); /* editSave */
+		$feed_ids = $this->dbh->escape_string($_POST["ids"]); /* batchEditSave */
+		$cat_id = (int) $this->dbh->escape_string($_POST["cat_id"]);
+		$auth_login = $this->dbh->escape_string(trim($_POST["auth_login"]));
 		$auth_pass = trim($_POST["auth_pass"]);
-		$private = checkbox_to_sql_bool(db_escape_string($_POST["private"]));
+		$private = checkbox_to_sql_bool($this->dbh->escape_string($_POST["private"]));
 		$include_in_digest = checkbox_to_sql_bool(
-			db_escape_string($_POST["include_in_digest"]));
+			$this->dbh->escape_string($_POST["include_in_digest"]));
 		$cache_images = checkbox_to_sql_bool(
-			db_escape_string($_POST["cache_images"]));
+			$this->dbh->escape_string($_POST["cache_images"]));
 		$hide_images = checkbox_to_sql_bool(
-			db_escape_string($_POST["hide_images"]));
+			$this->dbh->escape_string($_POST["hide_images"]));
 		$always_display_enclosures = checkbox_to_sql_bool(
-			db_escape_string($_POST["always_display_enclosures"]));
+			$this->dbh->escape_string($_POST["always_display_enclosures"]));
 
 		$mark_unread_on_update = checkbox_to_sql_bool(
-			db_escape_string($_POST["mark_unread_on_update"]));
+			$this->dbh->escape_string($_POST["mark_unread_on_update"]));
 
 		if (strlen(FEED_CRYPT_KEY) > 0) {
 			require_once "crypt.php";
@@ -968,7 +968,7 @@ class Pref_Feeds extends Handler_Protected {
 			$auth_pass_encrypted = 'false';
 		}
 
-		$auth_pass = db_escape_string($auth_pass);
+		$auth_pass = $this->dbh->escape_string($auth_pass);
 
 		if (get_pref('ENABLE_FEED_CATS')) {
 			if ($cat_id && $cat_id != 0) {
@@ -985,7 +985,7 @@ class Pref_Feeds extends Handler_Protected {
 
 		if (!$batch) {
 
-			$result = db_query("UPDATE ttrss_feeds SET
+			$result = $this->dbh->query("UPDATE ttrss_feeds SET
 				$category_qpart
 				title = '$feed_title', feed_url = '$feed_link',
 				update_interval = '$upd_intl',
@@ -1010,7 +1010,7 @@ class Pref_Feeds extends Handler_Protected {
 				}
 			}
 
-			db_query("BEGIN");
+			$this->dbh->query("BEGIN");
 
 			foreach (array_keys($feed_data) as $k) {
 
@@ -1073,23 +1073,23 @@ class Pref_Feeds extends Handler_Protected {
 				}
 
 				if ($qpart) {
-					db_query(
+					$this->dbh->query(
 						"UPDATE ttrss_feeds SET $qpart WHERE id IN ($feed_ids)
 						AND owner_uid = " . $_SESSION["uid"]);
 					print "<br/>";
 				}
 			}
 
-			db_query("COMMIT");
+			$this->dbh->query("COMMIT");
 		}
 		return;
 	}
 
 	function resetPubSub() {
 
-		$ids = db_escape_string($_REQUEST["ids"]);
+		$ids = $this->dbh->escape_string($_REQUEST["ids"]);
 
-		db_query("UPDATE ttrss_feeds SET pubsub_state = 0 WHERE id IN ($ids)
+		$this->dbh->query("UPDATE ttrss_feeds SET pubsub_state = 0 WHERE id IN ($ids)
 			AND owner_uid = " . $_SESSION["uid"]);
 
 		return;
@@ -1097,7 +1097,7 @@ class Pref_Feeds extends Handler_Protected {
 
 	function remove() {
 
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
 		foreach ($ids as $id) {
 			Pref_Feeds::remove_feed($id, $_SESSION["uid"]);
@@ -1107,20 +1107,20 @@ class Pref_Feeds extends Handler_Protected {
 	}
 
 	function clear() {
-		$id = db_escape_string($_REQUEST["id"]);
+		$id = $this->dbh->escape_string($_REQUEST["id"]);
 		$this->clear_feed_articles($id);
 	}
 
 	function rescore() {
 		require_once "rssfuncs.php";
 
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
 		foreach ($ids as $id) {
 
 			$filters = load_filters($id, $_SESSION["uid"], 6);
 
-			$result = db_query("SELECT
+			$result = $this->dbh->query("SELECT
 				title, content, link, ref_id, author,".
 				SUBSTRING_FOR_DATE."(updated, 1, 19) AS updated
 			  	FROM
@@ -1131,7 +1131,7 @@ class Pref_Feeds extends Handler_Protected {
 
 			$scores = array();
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 
 				$tags = get_article_tags($line["ref_id"]);
 
@@ -1148,15 +1148,15 @@ class Pref_Feeds extends Handler_Protected {
 
 			foreach (array_keys($scores) as $s) {
 				if ($s > 1000) {
-					db_query("UPDATE ttrss_user_entries SET score = '$s',
+					$this->dbh->query("UPDATE ttrss_user_entries SET score = '$s',
 						marked = true WHERE
 						ref_id IN (" . join(',', $scores[$s]) . ")");
 				} else if ($s < -500) {
-					db_query("UPDATE ttrss_user_entries SET score = '$s',
+					$this->dbh->query("UPDATE ttrss_user_entries SET score = '$s',
 						unread = false WHERE
 						ref_id IN (" . join(',', $scores[$s]) . ")");
 				} else {
-					db_query("UPDATE ttrss_user_entries SET score = '$s' WHERE
+					$this->dbh->query("UPDATE ttrss_user_entries SET score = '$s' WHERE
 						ref_id IN (" . join(',', $scores[$s]) . ")");
 				}
 			}
@@ -1168,16 +1168,16 @@ class Pref_Feeds extends Handler_Protected {
 
 	function rescoreAll() {
 
-		$result = db_query(
+		$result = $this->dbh->query(
 			"SELECT id FROM ttrss_feeds WHERE owner_uid = " . $_SESSION['uid']);
 
-		while ($feed_line = db_fetch_assoc($result)) {
+		while ($feed_line = $this->dbh->fetch_assoc($result)) {
 
 			$id = $feed_line["id"];
 
 			$filters = load_filters($id, $_SESSION["uid"], 6);
 
-			$tmp_result = db_query("SELECT
+			$tmp_result = $this->dbh->query("SELECT
 				title, content, link, ref_id, author,".
 				  	SUBSTRING_FOR_DATE."(updated, 1, 19) AS updated
 					FROM
@@ -1188,7 +1188,7 @@ class Pref_Feeds extends Handler_Protected {
 
 			$scores = array();
 
-			while ($line = db_fetch_assoc($tmp_result)) {
+			while ($line = $this->dbh->fetch_assoc($tmp_result)) {
 
 				$tags = get_article_tags($line["ref_id"]);
 
@@ -1205,11 +1205,11 @@ class Pref_Feeds extends Handler_Protected {
 
 			foreach (array_keys($scores) as $s) {
 				if ($s > 1000) {
-					db_query("UPDATE ttrss_user_entries SET score = '$s',
+					$this->dbh->query("UPDATE ttrss_user_entries SET score = '$s',
 						marked = true WHERE
 						ref_id IN (" . join(',', $scores[$s]) . ")");
 				} else {
-					db_query("UPDATE ttrss_user_entries SET score = '$s' WHERE
+					$this->dbh->query("UPDATE ttrss_user_entries SET score = '$s' WHERE
 						ref_id IN (" . join(',', $scores[$s]) . ")");
 				}
 			}
@@ -1220,9 +1220,9 @@ class Pref_Feeds extends Handler_Protected {
 	}
 
 	function categorize() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
-		$cat_id = db_escape_string($_REQUEST["cat_id"]);
+		$cat_id = $this->dbh->escape_string($_REQUEST["cat_id"]);
 
 		if ($cat_id == 0) {
 			$cat_id_qpart = 'NULL';
@@ -1230,28 +1230,28 @@ class Pref_Feeds extends Handler_Protected {
 			$cat_id_qpart = "'$cat_id'";
 		}
 
-		db_query("BEGIN");
+		$this->dbh->query("BEGIN");
 
 		foreach ($ids as $id) {
 
-			db_query("UPDATE ttrss_feeds SET cat_id = $cat_id_qpart
+			$this->dbh->query("UPDATE ttrss_feeds SET cat_id = $cat_id_qpart
 				WHERE id = '$id'
 			  	AND owner_uid = " . $_SESSION["uid"]);
 
 		}
 
-		db_query("COMMIT");
+		$this->dbh->query("COMMIT");
 	}
 
 	function removeCat() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 		foreach ($ids as $id) {
 			$this->remove_feed_category($id, $_SESSION["uid"]);
 		}
 	}
 
 	function addCat() {
-		$feed_cat = db_escape_string(trim($_REQUEST["cat"]));
+		$feed_cat = $this->dbh->escape_string(trim($_REQUEST["cat"]));
 
 		add_feed_category($feed_cat);
 	}
@@ -1261,10 +1261,10 @@ class Pref_Feeds extends Handler_Protected {
 		print "<div dojoType=\"dijit.layout.AccordionContainer\" region=\"center\">";
 		print "<div id=\"pref-feeds-feeds\" dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Feeds')."\">";
 
-		$result = db_query("SELECT COUNT(id) AS num_errors
+		$result = $this->dbh->query("SELECT COUNT(id) AS num_errors
 			FROM ttrss_feeds WHERE last_error != '' AND owner_uid = ".$_SESSION["uid"]);
 
-		$num_errors = db_fetch_result($result, 0, "num_errors");
+		$num_errors = $this->dbh->fetch_result($result, 0, "num_errors");
 
 		if ($num_errors > 0) {
 
@@ -1279,13 +1279,13 @@ class Pref_Feeds extends Handler_Protected {
 			$interval_qpart = "DATE_SUB(NOW(), INTERVAL 3 MONTH)";
 		}
 
-		$result = db_query("SELECT COUNT(*) AS num_inactive FROM ttrss_feeds WHERE
+		$result = $this->dbh->query("SELECT COUNT(*) AS num_inactive FROM ttrss_feeds WHERE
 					(SELECT MAX(updated) FROM ttrss_entries, ttrss_user_entries WHERE
 						ttrss_entries.id = ref_id AND
 							ttrss_user_entries.feed_id = ttrss_feeds.id) < $interval_qpart AND
 			ttrss_feeds.owner_uid = ".$_SESSION["uid"]);
 
-		$num_inactive = db_fetch_result($result, 0, "num_inactive");
+		$num_inactive = $this->dbh->fetch_result($result, 0, "num_inactive");
 
 		if ($num_inactive > 0) {
 			$inactive_button = "<button dojoType=\"dijit.form.Button\"
@@ -1293,7 +1293,7 @@ class Pref_Feeds extends Handler_Protected {
 					__("Inactive feeds") . "</button>";
 		}
 
-		$feed_search = db_escape_string($_REQUEST["search"]);
+		$feed_search = $this->dbh->escape_string($_REQUEST["search"]);
 
 		if (array_key_exists("search", $_REQUEST)) {
 			$_SESSION["prefs_feed_search"] = $feed_search;
@@ -1567,7 +1567,7 @@ class Pref_Feeds extends Handler_Protected {
 			$interval_qpart = "DATE_SUB(NOW(), INTERVAL 3 MONTH)";
 		}
 
-		$result = db_query("SELECT ttrss_feeds.title, ttrss_feeds.site_url,
+		$result = $this->dbh->query("SELECT ttrss_feeds.title, ttrss_feeds.site_url,
 		  		ttrss_feeds.feed_url, ttrss_feeds.id, MAX(updated) AS last_article
 			FROM ttrss_feeds, ttrss_entries, ttrss_user_entries WHERE
 				(SELECT MAX(updated) FROM ttrss_entries, ttrss_user_entries WHERE
@@ -1598,7 +1598,7 @@ class Pref_Feeds extends Handler_Protected {
 
 		$lnum = 1;
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 
 			$class = ($lnum % 2) ? "even" : "odd";
 			$feed_id = $line["id"];
@@ -1648,7 +1648,7 @@ class Pref_Feeds extends Handler_Protected {
 		print "<h2>" . __("These feeds have not been updated because of errors:") .
 			"</h2>";
 
-		$result = db_query("SELECT id,title,feed_url,last_error,site_url
+		$result = $this->dbh->query("SELECT id,title,feed_url,last_error,site_url
 		FROM ttrss_feeds WHERE last_error != '' AND owner_uid = ".$_SESSION["uid"]);
 
 		print "<div dojoType=\"dijit.Toolbar\">";
@@ -1668,7 +1668,7 @@ class Pref_Feeds extends Handler_Protected {
 
 		$lnum = 1;
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 
 			$class = ($lnum % 2) ? "even" : "odd";
 			$feed_id = $line["id"];
@@ -1725,14 +1725,14 @@ class Pref_Feeds extends Handler_Protected {
 	private function clear_feed_articles($id) {
 
 		if ($id != 0) {
-			$result = db_query("DELETE FROM ttrss_user_entries
+			$result = $this->dbh->query("DELETE FROM ttrss_user_entries
 			WHERE feed_id = '$id' AND marked = false AND owner_uid = " . $_SESSION["uid"]);
 		} else {
-			$result = db_query("DELETE FROM ttrss_user_entries
+			$result = $this->dbh->query("DELETE FROM ttrss_user_entries
 			WHERE feed_id IS NULL AND marked = false AND owner_uid = " . $_SESSION["uid"]);
 		}
 
-		$result = db_query("DELETE FROM ttrss_entries WHERE
+		$result = $this->dbh->query("DELETE FROM ttrss_entries WHERE
 			(SELECT COUNT(int_id) FROM ttrss_user_entries WHERE ref_id = id) = 0");
 
 		ccache_update($id, $_SESSION['uid']);
@@ -1740,7 +1740,7 @@ class Pref_Feeds extends Handler_Protected {
 
 	private function remove_feed_category($id, $owner_uid) {
 
-		db_query("DELETE FROM ttrss_feed_categories
+		$this->dbh->query("DELETE FROM ttrss_feed_categories
 			WHERE id = '$id' AND owner_uid = $owner_uid");
 
 		ccache_remove($id, $owner_uid, true);
@@ -1855,17 +1855,17 @@ class Pref_Feeds extends Handler_Protected {
 	}
 
 	function batchAddFeeds() {
-		$cat_id = db_escape_string($_REQUEST['cat']);
+		$cat_id = $this->dbh->escape_string($_REQUEST['cat']);
 		$feeds = explode("\n", $_REQUEST['feeds']);
-		$login = db_escape_string($_REQUEST['login']);
+		$login = $this->dbh->escape_string($_REQUEST['login']);
 		$pass = trim($_REQUEST['pass']);
 
 		foreach ($feeds as $feed) {
-			$feed = db_escape_string(trim($feed));
+			$feed = $this->dbh->escape_string(trim($feed));
 
 			if (validate_feed_url($feed)) {
 
-				db_query("BEGIN");
+				$this->dbh->query("BEGIN");
 
 				if ($cat_id == "0" || !$cat_id) {
 					$cat_qpart = "NULL";
@@ -1873,7 +1873,7 @@ class Pref_Feeds extends Handler_Protected {
 					$cat_qpart = "'$cat_id'";
 				}
 
-				$result = db_query(
+				$result = $this->dbh->query(
 					"SELECT id FROM ttrss_feeds
 					WHERE feed_url = '$feed' AND owner_uid = ".$_SESSION["uid"]);
 
@@ -1885,17 +1885,17 @@ class Pref_Feeds extends Handler_Protected {
 					$auth_pass_encrypted = 'false';
 				}
 
-				$pass = db_escape_string($pass);
+				$pass = $this->dbh->escape_string($pass);
 
-				if (db_num_rows($result) == 0) {
-					$result = db_query(
+				if ($this->dbh->num_rows($result) == 0) {
+					$result = $this->dbh->query(
 						"INSERT INTO ttrss_feeds
 							(owner_uid,feed_url,title,cat_id,auth_login,auth_pass,update_method,auth_pass_encrypted)
 						VALUES ('".$_SESSION["uid"]."', '$feed',
 							'[Unknown]', $cat_qpart, '$login', '$pass', 0, $auth_pass_encrypted)");
 				}
 
-				db_query("COMMIT");
+				$this->dbh->query("COMMIT");
 			}
 		}
 	}
@@ -1910,8 +1910,8 @@ class Pref_Feeds extends Handler_Protected {
 	}
 
 	function regenFeedKey() {
-		$feed_id = db_escape_string($_REQUEST['id']);
-		$is_cat = db_escape_string($_REQUEST['is_cat']) == "true";
+		$feed_id = $this->dbh->escape_string($_REQUEST['id']);
+		$is_cat = $this->dbh->escape_string($_REQUEST['is_cat']) == "true";
 
 		$new_key = $this->update_feed_access_key($feed_id, $is_cat);
 
@@ -1924,14 +1924,14 @@ class Pref_Feeds extends Handler_Protected {
 
 		$sql_is_cat = bool_to_sql_bool($is_cat);
 
-		$result = db_query("SELECT access_key FROM ttrss_access_keys
+		$result = $this->dbh->query("SELECT access_key FROM ttrss_access_keys
 			WHERE feed_id = '$feed_id'	AND is_cat = $sql_is_cat
 			AND owner_uid = " . $owner_uid);
 
-		if (db_num_rows($result) == 1) {
-			$key = db_escape_string(sha1(uniqid(rand(), true)));
+		if ($this->dbh->num_rows($result) == 1) {
+			$key = $this->dbh->escape_string(sha1(uniqid(rand(), true)));
 
-			db_query("UPDATE ttrss_access_keys SET access_key = '$key'
+			$this->dbh->query("UPDATE ttrss_access_keys SET access_key = '$key'
 				WHERE feed_id = '$feed_id' AND is_cat = $sql_is_cat
 				AND owner_uid = " . $owner_uid);
 
@@ -1944,7 +1944,7 @@ class Pref_Feeds extends Handler_Protected {
 
 	// Silent
 	function clearKeys() {
-		db_query("DELETE FROM ttrss_access_keys WHERE
+		$this->dbh->query("DELETE FROM ttrss_access_keys WHERE
 			owner_uid = " . $_SESSION["uid"]);
 	}
 
diff --git a/classes/pref/filters.php b/classes/pref/filters.php
index 18a830f4b..ec7fd0d51 100644
--- a/classes/pref/filters.php
+++ b/classes/pref/filters.php
@@ -9,7 +9,7 @@ class Pref_Filters extends Handler_Protected {
 	}
 
 	function filtersortreset() {
-		db_query("UPDATE ttrss_filters2
+		$this->dbh->query("UPDATE ttrss_filters2
 				SET order_id = 0 WHERE owner_uid = " . $_SESSION["uid"]);
 		return;
 	}
@@ -31,7 +31,7 @@ class Pref_Filters extends Handler_Protected {
 
 				if ($filter_id > 0) {
 
-					db_query("UPDATE ttrss_filters2 SET
+					$this->dbh->query("UPDATE ttrss_filters2 SET
 						order_id = $index WHERE id = '$filter_id' AND
 						owner_uid = " .$_SESSION["uid"]);
 
@@ -49,16 +49,16 @@ class Pref_Filters extends Handler_Protected {
 
 		$filter["enabled"] = true;
 		$filter["match_any_rule"] = sql_bool_to_bool(
-			checkbox_to_sql_bool(db_escape_string($_REQUEST["match_any_rule"])));
+			checkbox_to_sql_bool($this->dbh->escape_string($_REQUEST["match_any_rule"])));
 		$filter["inverse"] = sql_bool_to_bool(
-			checkbox_to_sql_bool(db_escape_string($_REQUEST["inverse"])));
+			checkbox_to_sql_bool($this->dbh->escape_string($_REQUEST["inverse"])));
 
 		$filter["rules"] = array();
 
-		$result = db_query("SELECT id,name FROM ttrss_filter_types");
+		$result = $this->dbh->query("SELECT id,name FROM ttrss_filter_types");
 
 		$filter_types = array();
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$filter_types[$line["id"]] = $line["name"];
 		}
 
@@ -98,7 +98,7 @@ class Pref_Filters extends Handler_Protected {
 		print "<div class=\"filterTestHolder\">";
 		print "<table width=\"100%\" cellspacing=\"0\" id=\"prefErrorFeedList\">";
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 
 			$entry_timestamp = strtotime($line["updated"]);
 			$entry_tags = get_article_tags($line["id"], $_SESSION["uid"]);
@@ -158,7 +158,7 @@ class Pref_Filters extends Handler_Protected {
 
 		$filter_search = $_SESSION["prefs_filter_search"];
 
-		$result = db_query("SELECT *,
+		$result = $this->dbh->query("SELECT *,
 			(SELECT action_param FROM ttrss_filters2_actions
 				WHERE filter_id = ttrss_filters2.id ORDER BY id LIMIT 1) AS action_param,
 			(SELECT action_id FROM ttrss_filters2_actions
@@ -176,7 +176,7 @@ class Pref_Filters extends Handler_Protected {
 		$folder = array();
 		$folder['items'] = array();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 
 			/* if ($action_id != $line["action_id"]) {
 				if (count($folder['items']) > 0) {
@@ -194,10 +194,10 @@ class Pref_Filters extends Handler_Protected {
 
 			$match_ok = false;
 			if ($filter_search) {
-				$rules_result = db_query(
+				$rules_result = $this->dbh->query(
 					"SELECT reg_exp FROM ttrss_filters2_rules WHERE filter_id = ".$line["id"]);
 
-				while ($rule_line = db_fetch_assoc($rules_result)) {
+				while ($rule_line = $this->dbh->fetch_assoc($rules_result)) {
 					if (mb_strpos($rule_line['reg_exp'], $filter_search) !== false) {
 						$match_ok = true;
 						break;
@@ -206,13 +206,13 @@ class Pref_Filters extends Handler_Protected {
 			}
 
 			if ($line['action_id'] == 7) {
-				$label_result = db_query("SELECT fg_color, bg_color
-					FROM ttrss_labels2 WHERE caption = '".db_escape_string($line['action_param'])."' AND
+				$label_result = $this->dbh->query("SELECT fg_color, bg_color
+					FROM ttrss_labels2 WHERE caption = '".$this->dbh->escape_string($line['action_param'])."' AND
 						owner_uid = " . $_SESSION["uid"]);
 
-				if (db_num_rows($label_result) > 0) {
-					$fg_color = db_fetch_result($label_result, 0, "fg_color");
-					$bg_color = db_fetch_result($label_result, 0, "bg_color");
+				if ($this->dbh->num_rows($label_result) > 0) {
+					$fg_color = $this->dbh->fetch_result($label_result, 0, "fg_color");
+					$bg_color = $this->dbh->fetch_result($label_result, 0, "bg_color");
 
 					$name[1] = "<span class=\"labelColorIndicator\" id=\"label-editor-indicator\" style='color : $fg_color; background-color : $bg_color; margin-right : 4px'>&alpha;</span>" . $name[1];
 				}
@@ -248,15 +248,15 @@ class Pref_Filters extends Handler_Protected {
 
 	function edit() {
 
-		$filter_id = db_escape_string($_REQUEST["id"]);
+		$filter_id = $this->dbh->escape_string($_REQUEST["id"]);
 
-		$result = db_query(
+		$result = $this->dbh->query(
 			"SELECT * FROM ttrss_filters2 WHERE id = '$filter_id' AND owner_uid = " . $_SESSION["uid"]);
 
-		$enabled = sql_bool_to_bool(db_fetch_result($result, 0, "enabled"));
-		$match_any_rule = sql_bool_to_bool(db_fetch_result($result, 0, "match_any_rule"));
-		$inverse = sql_bool_to_bool(db_fetch_result($result, 0, "inverse"));
-		$title = htmlspecialchars(db_fetch_result($result, 0, "title"));
+		$enabled = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "enabled"));
+		$match_any_rule = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "match_any_rule"));
+		$inverse = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "inverse"));
+		$title = htmlspecialchars($this->dbh->fetch_result($result, 0, "title"));
 
 		print "<form id=\"filter_edit_form\" onsubmit='return false'>";
 
@@ -294,10 +294,10 @@ class Pref_Filters extends Handler_Protected {
 
 		print "<ul id='filterDlg_Matches'>";
 
-		$rules_result = db_query("SELECT * FROM ttrss_filters2_rules
+		$rules_result = $this->dbh->query("SELECT * FROM ttrss_filters2_rules
 			WHERE filter_id = '$filter_id' ORDER BY reg_exp, id");
 
-		while ($line = db_fetch_assoc($rules_result)) {
+		while ($line = $this->dbh->fetch_assoc($rules_result)) {
 			if (sql_bool_to_bool($line["cat_filter"])) {
 				$line["feed_id"] = "CAT:" . (int)$line["cat_id"];
 			}
@@ -342,10 +342,10 @@ class Pref_Filters extends Handler_Protected {
 
 		print "<ul id='filterDlg_Actions'>";
 
-		$actions_result = db_query("SELECT * FROM ttrss_filters2_actions
+		$actions_result = $this->dbh->query("SELECT * FROM ttrss_filters2_actions
 			WHERE filter_id = '$filter_id' ORDER BY id");
 
-		while ($line = db_fetch_assoc($actions_result)) {
+		while ($line = $this->dbh->fetch_assoc($actions_result)) {
 			$line["action_param_label"] = $line["action_param"];
 
 			unset($line["filter_id"]);
@@ -427,9 +427,9 @@ class Pref_Filters extends Handler_Protected {
 				$feed = __("All feeds");
 		}
 
-		$result = db_query("SELECT description FROM ttrss_filter_types
+		$result = $this->dbh->query("SELECT description FROM ttrss_filter_types
 			WHERE id = ".(int)$rule["filter_type"]);
-		$filter_type = db_fetch_result($result, 0, "description");
+		$filter_type = $this->dbh->fetch_result($result, 0, "description");
 
 		return T_sprintf("%s on %s in %s %s", strip_tags($rule["reg_exp"]),
 			$filter_type, $feed, isset($rule["inverse"]) ? __("(inverse)") : "");
@@ -440,10 +440,10 @@ class Pref_Filters extends Handler_Protected {
 	}
 
 	private function getActionName($action) {
-		$result = db_query("SELECT description FROM
+		$result = $this->dbh->query("SELECT description FROM
 			ttrss_filter_actions WHERE id = " .(int)$action["action_id"]);
 
-		$title = __(db_fetch_result($result, 0, "description"));
+		$title = __($this->dbh->fetch_result($result, 0, "description"));
 
 		if ($action["action_id"] == 4 || $action["action_id"] == 6 ||
 			$action["action_id"] == 7)
@@ -463,13 +463,13 @@ class Pref_Filters extends Handler_Protected {
 
 #		print_r($_REQUEST);
 
-		$filter_id = db_escape_string($_REQUEST["id"]);
-		$enabled = checkbox_to_sql_bool(db_escape_string($_REQUEST["enabled"]));
-		$match_any_rule = checkbox_to_sql_bool(db_escape_string($_REQUEST["match_any_rule"]));
-		$inverse = checkbox_to_sql_bool(db_escape_string($_REQUEST["inverse"]));
-		$title = db_escape_string($_REQUEST["title"]);
+		$filter_id = $this->dbh->escape_string($_REQUEST["id"]);
+		$enabled = checkbox_to_sql_bool($this->dbh->escape_string($_REQUEST["enabled"]));
+		$match_any_rule = checkbox_to_sql_bool($this->dbh->escape_string($_REQUEST["match_any_rule"]));
+		$inverse = checkbox_to_sql_bool($this->dbh->escape_string($_REQUEST["inverse"]));
+		$title = $this->dbh->escape_string($_REQUEST["title"]);
 
-		$result = db_query("UPDATE ttrss_filters2 SET enabled = $enabled,
+		$result = $this->dbh->query("UPDATE ttrss_filters2 SET enabled = $enabled,
 			match_any_rule = $match_any_rule,
 			inverse = $inverse,
 			title = '$title'
@@ -482,17 +482,17 @@ class Pref_Filters extends Handler_Protected {
 
 	function remove() {
 
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
 		foreach ($ids as $id) {
-			db_query("DELETE FROM ttrss_filters2 WHERE id = '$id' AND owner_uid = ". $_SESSION["uid"]);
+			$this->dbh->query("DELETE FROM ttrss_filters2 WHERE id = '$id' AND owner_uid = ". $_SESSION["uid"]);
 		}
 	}
 
 	private function saveRulesAndActions($filter_id) {
 
-		db_query("DELETE FROM ttrss_filters2_rules WHERE filter_id = '$filter_id'");
-		db_query("DELETE FROM ttrss_filters2_actions WHERE filter_id = '$filter_id'");
+		$this->dbh->query("DELETE FROM ttrss_filters2_rules WHERE filter_id = '$filter_id'");
+		$this->dbh->query("DELETE FROM ttrss_filters2_actions WHERE filter_id = '$filter_id'");
 
 		if ($filter_id) {
 			/* create rules */
@@ -521,11 +521,11 @@ class Pref_Filters extends Handler_Protected {
 			foreach ($rules as $rule) {
 				if ($rule) {
 
-					$reg_exp = strip_tags(db_escape_string(trim($rule["reg_exp"])));
+					$reg_exp = strip_tags($this->dbh->escape_string(trim($rule["reg_exp"])));
 					$inverse = isset($rule["inverse"]) ? "true" : "false";
 
-					$filter_type = (int) db_escape_string(trim($rule["filter_type"]));
-					$feed_id = db_escape_string(trim($rule["feed_id"]));
+					$filter_type = (int) $this->dbh->escape_string(trim($rule["filter_type"]));
+					$feed_id = $this->dbh->escape_string(trim($rule["feed_id"]));
 
 					if (strpos($feed_id, "CAT:") === 0) {
 
@@ -546,16 +546,16 @@ class Pref_Filters extends Handler_Protected {
 						(filter_id, reg_exp,filter_type,feed_id,cat_id,cat_filter,inverse) VALUES
 						('$filter_id', '$reg_exp', '$filter_type', $feed_id, $cat_id, $cat_filter, $inverse)";
 
-					db_query($query);
+					$this->dbh->query($query);
 				}
 			}
 
 			foreach ($actions as $action) {
 				if ($action) {
 
-					$action_id = (int) db_escape_string($action["action_id"]);
-					$action_param = db_escape_string($action["action_param"]);
-					$action_param_label = db_escape_string($action["action_param_label"]);
+					$action_id = (int) $this->dbh->escape_string($action["action_id"]);
+					$action_param = $this->dbh->escape_string($action["action_param"]);
+					$action_param_label = $this->dbh->escape_string($action["action_param_label"]);
 
 					if ($action_id == 7) {
 						$action_param = $action_param_label;
@@ -569,7 +569,7 @@ class Pref_Filters extends Handler_Protected {
 						(filter_id, action_id, action_param) VALUES
 						('$filter_id', '$action_id', '$action_param')";
 
-					db_query($query);
+					$this->dbh->query($query);
 				}
 			}
 		}
@@ -586,35 +586,35 @@ class Pref_Filters extends Handler_Protected {
 
 		$enabled = checkbox_to_sql_bool($_REQUEST["enabled"]);
 		$match_any_rule = checkbox_to_sql_bool($_REQUEST["match_any_rule"]);
-		$title = db_escape_string($_REQUEST["title"]);
+		$title = $this->dbh->escape_string($_REQUEST["title"]);
 
-		db_query("BEGIN");
+		$this->dbh->query("BEGIN");
 
 		/* create base filter */
 
-		$result = db_query("INSERT INTO ttrss_filters2
+		$result = $this->dbh->query("INSERT INTO ttrss_filters2
 			(owner_uid, match_any_rule, enabled, title) VALUES
 			(".$_SESSION["uid"].",$match_any_rule,$enabled, '$title')");
 
-		$result = db_query("SELECT MAX(id) AS id FROM ttrss_filters2
+		$result = $this->dbh->query("SELECT MAX(id) AS id FROM ttrss_filters2
 			WHERE owner_uid = ".$_SESSION["uid"]);
 
-		$filter_id = db_fetch_result($result, 0, "id");
+		$filter_id = $this->dbh->fetch_result($result, 0, "id");
 
 		$this->saveRulesAndActions($filter_id);
 
-		db_query("COMMIT");
+		$this->dbh->query("COMMIT");
 	}
 
 	function index() {
 
-		$sort = db_escape_string($_REQUEST["sort"]);
+		$sort = $this->dbh->escape_string($_REQUEST["sort"]);
 
 		if (!$sort || $sort == "undefined") {
 			$sort = "reg_exp";
 		}
 
-		$filter_search = db_escape_string($_REQUEST["search"]);
+		$filter_search = $this->dbh->escape_string($_REQUEST["search"]);
 
 		if (array_key_exists("search", $_REQUEST)) {
 			$_SESSION["prefs_filter_search"] = $filter_search;
@@ -626,7 +626,7 @@ class Pref_Filters extends Handler_Protected {
 		print "<div id=\"pref-filter-header\" dojoType=\"dijit.layout.ContentPane\" region=\"top\">";
 		print "<div id=\"pref-filter-toolbar\" dojoType=\"dijit.Toolbar\">";
 
-		$filter_search = db_escape_string($_REQUEST["search"]);
+		$filter_search = $this->dbh->escape_string($_REQUEST["search"]);
 
 		if (array_key_exists("search", $_REQUEST)) {
 			$_SESSION["prefs_filter_search"] = $filter_search;
@@ -832,12 +832,12 @@ class Pref_Filters extends Handler_Protected {
 
 		print "<form name='filter_new_rule_form' id='filter_new_rule_form'>";
 
-		$result = db_query("SELECT id,description
+		$result = $this->dbh->query("SELECT id,description
 			FROM ttrss_filter_types WHERE id != 5 ORDER BY description");
 
 		$filter_types = array();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$filter_types[$line["id"]] = __($line["description"]);
 		}
 
@@ -888,7 +888,7 @@ class Pref_Filters extends Handler_Protected {
 		$action = json_decode($_REQUEST["action"], true);
 
 		if ($action) {
-			$action_param = db_escape_string($action["action_param"]);
+			$action_param = $this->dbh->escape_string($action["action_param"]);
 			$action_id = (int)$action["action_id"];
 		} else {
 			$action_param = "";
@@ -904,10 +904,10 @@ class Pref_Filters extends Handler_Protected {
 		print "<select name=\"action_id\" dojoType=\"dijit.form.Select\"
 			onchange=\"filterDlgCheckAction(this)\">";
 
-		$result = db_query("SELECT id,description FROM ttrss_filter_actions
+		$result = $this->dbh->query("SELECT id,description FROM ttrss_filter_actions
 			ORDER BY name");
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$is_selected = ($line["id"] == $action_id) ? "selected='1'" : "";
 			printf("<option $is_selected value='%d'>%s</option>", $line["id"], __($line["description"]));
 		}
@@ -953,28 +953,28 @@ class Pref_Filters extends Handler_Protected {
 
 	private function getFilterName($id) {
 
-		$result = db_query(
+		$result = $this->dbh->query(
 			"SELECT title,COUNT(DISTINCT r.id) AS num_rules,COUNT(DISTINCT a.id) AS num_actions
 				FROM ttrss_filters2 AS f LEFT JOIN ttrss_filters2_rules AS r
 					ON (r.filter_id = f.id)
 						LEFT JOIN ttrss_filters2_actions AS a
 							ON (a.filter_id = f.id) WHERE f.id = '$id' GROUP BY f.title");
 
-		$title = db_fetch_result($result, 0, "title");
-		$num_rules = db_fetch_result($result, 0, "num_rules");
-		$num_actions = db_fetch_result($result, 0, "num_actions");
+		$title = $this->dbh->fetch_result($result, 0, "title");
+		$num_rules = $this->dbh->fetch_result($result, 0, "num_rules");
+		$num_actions = $this->dbh->fetch_result($result, 0, "num_actions");
 
 		if (!$title) $title = __("[No caption]");
 
 		$title = sprintf(_ngettext("%s (%d rule)", "%s (%d rules)", $num_rules), $title, $num_rules);
 
-		$result = db_query(
+		$result = $this->dbh->query(
 			"SELECT * FROM ttrss_filters2_actions WHERE filter_id = '$id' ORDER BY id LIMIT 1");
 
 		$actions = "";
 
-		if (db_num_rows($result) > 0) {
-			$line = db_fetch_assoc($result);
+		if ($this->dbh->num_rows($result) > 0) {
+			$line = $this->dbh->fetch_assoc($result);
 			$actions = $this->getActionName($line);
 
 			$num_actions -= 1;
@@ -987,22 +987,22 @@ class Pref_Filters extends Handler_Protected {
 	}
 
 	function join() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
 		if (count($ids) > 1) {
 			$base_id = array_shift($ids);
 			$ids_str = join(",", $ids);
 
-			db_query("BEGIN");
-			db_query("UPDATE ttrss_filters2_rules
+			$this->dbh->query("BEGIN");
+			$this->dbh->query("UPDATE ttrss_filters2_rules
 				SET filter_id = '$base_id' WHERE filter_id IN ($ids_str)");
-			db_query("UPDATE ttrss_filters2_actions
+			$this->dbh->query("UPDATE ttrss_filters2_actions
 				SET filter_id = '$base_id' WHERE filter_id IN ($ids_str)");
 
-			db_query("DELETE FROM ttrss_filters2 WHERE id IN ($ids_str)");
-			db_query("UPDATE ttrss_filters2 SET match_any_rule = true WHERE id = '$base_id'");
+			$this->dbh->query("DELETE FROM ttrss_filters2 WHERE id IN ($ids_str)");
+			$this->dbh->query("UPDATE ttrss_filters2 SET match_any_rule = true WHERE id = '$base_id'");
 
-			db_query("COMMIT");
+			$this->dbh->query("COMMIT");
 
 			$this->optimizeFilter($base_id);
 
@@ -1010,14 +1010,14 @@ class Pref_Filters extends Handler_Protected {
 	}
 
 	private function optimizeFilter($id) {
-		db_query("BEGIN");
-		$result = db_query("SELECT * FROM ttrss_filters2_actions
+		$this->dbh->query("BEGIN");
+		$result = $this->dbh->query("SELECT * FROM ttrss_filters2_actions
 			WHERE filter_id = '$id'");
 
 		$tmp = array();
 		$dupe_ids = array();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$id = $line["id"];
 			unset($line["id"]);
 
@@ -1030,17 +1030,17 @@ class Pref_Filters extends Handler_Protected {
 
 		if (count($dupe_ids) > 0) {
 			$ids_str = join(",", $dupe_ids);
-			db_query("DELETE FROM ttrss_filters2_actions
+			$this->dbh->query("DELETE FROM ttrss_filters2_actions
 				WHERE id IN ($ids_str)");
 		}
 
-		$result = db_query("SELECT * FROM ttrss_filters2_rules
+		$result = $this->dbh->query("SELECT * FROM ttrss_filters2_rules
 			WHERE filter_id = '$id'");
 
 		$tmp = array();
 		$dupe_ids = array();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$id = $line["id"];
 			unset($line["id"]);
 
@@ -1053,11 +1053,11 @@ class Pref_Filters extends Handler_Protected {
 
 		if (count($dupe_ids) > 0) {
 			$ids_str = join(",", $dupe_ids);
-			db_query("DELETE FROM ttrss_filters2_rules
+			$this->dbh->query("DELETE FROM ttrss_filters2_rules
 				WHERE id IN ($ids_str)");
 		}
 
-		db_query("COMMIT");
+		$this->dbh->query("COMMIT");
 	}
 }
 ?>
diff --git a/classes/pref/labels.php b/classes/pref/labels.php
index 38056ed6c..a928dd017 100644
--- a/classes/pref/labels.php
+++ b/classes/pref/labels.php
@@ -8,12 +8,12 @@ class Pref_Labels extends Handler_Protected {
 	}
 
 	function edit() {
-		$label_id = db_escape_string($_REQUEST['id']);
+		$label_id = $this->dbh->escape_string($_REQUEST['id']);
 
-		$result = db_query("SELECT * FROM ttrss_labels2 WHERE
+		$result = $this->dbh->query("SELECT * FROM ttrss_labels2 WHERE
 			id = '$label_id' AND owner_uid = " . $_SESSION["uid"]);
 
-		$line = db_fetch_assoc($result);
+		$line = $this->dbh->fetch_assoc($result);
 
 		print "<input dojoType=\"dijit.form.TextBox\" style=\"display : none\" name=\"id\" value=\"$label_id\">";
 		print "<input dojoType=\"dijit.form.TextBox\" style=\"display : none\" name=\"op\" value=\"pref-labels\">";
@@ -90,12 +90,12 @@ class Pref_Labels extends Handler_Protected {
 		$root['name'] = __('Labels');
 		$root['items'] = array();
 
-		$result = db_query("SELECT *
+		$result = $this->dbh->query("SELECT *
 			FROM ttrss_labels2
 			WHERE owner_uid = ".$_SESSION["uid"]."
 			ORDER BY caption");
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$label = array();
 			$label['id'] = 'LABEL:' . $line['id'];
 			$label['bare_id'] = $line['id'];
@@ -118,29 +118,29 @@ class Pref_Labels extends Handler_Protected {
 	}
 
 	function colorset() {
-		$kind = db_escape_string($_REQUEST["kind"]);
-		$ids = explode(',', db_escape_string($_REQUEST["ids"]));
-		$color = db_escape_string($_REQUEST["color"]);
-		$fg = db_escape_string($_REQUEST["fg"]);
-		$bg = db_escape_string($_REQUEST["bg"]);
+		$kind = $this->dbh->escape_string($_REQUEST["kind"]);
+		$ids = explode(',', $this->dbh->escape_string($_REQUEST["ids"]));
+		$color = $this->dbh->escape_string($_REQUEST["color"]);
+		$fg = $this->dbh->escape_string($_REQUEST["fg"]);
+		$bg = $this->dbh->escape_string($_REQUEST["bg"]);
 
 		foreach ($ids as $id) {
 
 			if ($kind == "fg" || $kind == "bg") {
-				db_query("UPDATE ttrss_labels2 SET
+				$this->dbh->query("UPDATE ttrss_labels2 SET
 					${kind}_color = '$color' WHERE id = '$id'
 					AND owner_uid = " . $_SESSION["uid"]);
 			} else {
-				db_query("UPDATE ttrss_labels2 SET
+				$this->dbh->query("UPDATE ttrss_labels2 SET
 					fg_color = '$fg', bg_color = '$bg' WHERE id = '$id'
 					AND owner_uid = " . $_SESSION["uid"]);
 			}
 
-			$caption = db_escape_string(label_find_caption($id, $_SESSION["uid"]));
+			$caption = $this->dbh->escape_string(label_find_caption($id, $_SESSION["uid"]));
 
 			/* Remove cached data */
 
-			db_query("UPDATE ttrss_user_entries SET label_cache = ''
+			$this->dbh->query("UPDATE ttrss_user_entries SET label_cache = ''
 				WHERE label_cache LIKE '%$caption%' AND owner_uid = " . $_SESSION["uid"]);
 
 		}
@@ -149,18 +149,18 @@ class Pref_Labels extends Handler_Protected {
 	}
 
 	function colorreset() {
-		$ids = explode(',', db_escape_string($_REQUEST["ids"]));
+		$ids = explode(',', $this->dbh->escape_string($_REQUEST["ids"]));
 
 		foreach ($ids as $id) {
-			db_query("UPDATE ttrss_labels2 SET
+			$this->dbh->query("UPDATE ttrss_labels2 SET
 				fg_color = '', bg_color = '' WHERE id = '$id'
 				AND owner_uid = " . $_SESSION["uid"]);
 
-			$caption = db_escape_string(label_find_caption($id, $_SESSION["uid"]));
+			$caption = $this->dbh->escape_string(label_find_caption($id, $_SESSION["uid"]));
 
 			/* Remove cached data */
 
-			db_query("UPDATE ttrss_user_entries SET label_cache = ''
+			$this->dbh->query("UPDATE ttrss_user_entries SET label_cache = ''
 				WHERE label_cache LIKE '%$caption%' AND owner_uid = " . $_SESSION["uid"]);
 		}
 
@@ -168,31 +168,31 @@ class Pref_Labels extends Handler_Protected {
 
 	function save() {
 
-		$id = db_escape_string($_REQUEST["id"]);
-		$caption = db_escape_string(trim($_REQUEST["caption"]));
+		$id = $this->dbh->escape_string($_REQUEST["id"]);
+		$caption = $this->dbh->escape_string(trim($_REQUEST["caption"]));
 
-		db_query("BEGIN");
+		$this->dbh->query("BEGIN");
 
-		$result = db_query("SELECT caption FROM ttrss_labels2
+		$result = $this->dbh->query("SELECT caption FROM ttrss_labels2
 			WHERE id = '$id' AND owner_uid = ". $_SESSION["uid"]);
 
-		if (db_num_rows($result) != 0) {
-			$old_caption = db_fetch_result($result, 0, "caption");
+		if ($this->dbh->num_rows($result) != 0) {
+			$old_caption = $this->dbh->fetch_result($result, 0, "caption");
 
-			$result = db_query("SELECT id FROM ttrss_labels2
+			$result = $this->dbh->query("SELECT id FROM ttrss_labels2
 				WHERE caption = '$caption' AND owner_uid = ". $_SESSION["uid"]);
 
-			if (db_num_rows($result) == 0) {
+			if ($this->dbh->num_rows($result) == 0) {
 				if ($caption) {
-					$result = db_query("UPDATE ttrss_labels2 SET
+					$result = $this->dbh->query("UPDATE ttrss_labels2 SET
 						caption = '$caption' WHERE id = '$id' AND
 						owner_uid = " . $_SESSION["uid"]);
 
 					/* Update filters that reference label being renamed */
 
-					$old_caption = db_escape_string($old_caption);
+					$old_caption = $this->dbh->escape_string($old_caption);
 
-					db_query("UPDATE ttrss_filters2_actions SET
+					$this->dbh->query("UPDATE ttrss_filters2_actions SET
 						action_param = '$caption' WHERE action_param = '$old_caption'
 						AND action_id = 7
 						AND filter_id IN (SELECT id FROM ttrss_filters2 WHERE owner_uid = ".$_SESSION["uid"].")");
@@ -206,14 +206,14 @@ class Pref_Labels extends Handler_Protected {
 			}
 		}
 
-		db_query("COMMIT");
+		$this->dbh->query("COMMIT");
 
 		return;
 	}
 
 	function remove() {
 
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
 		foreach ($ids as $id) {
 			label_remove($id, $_SESSION["uid"]);
@@ -222,8 +222,8 @@ class Pref_Labels extends Handler_Protected {
 	}
 
 	function add() {
-		$caption = db_escape_string($_REQUEST["caption"]);
-		$output = db_escape_string($_REQUEST["output"]);
+		$caption = $this->dbh->escape_string($_REQUEST["caption"]);
+		$output = $this->dbh->escape_string($_REQUEST["output"]);
 
 		if ($caption) {
 
@@ -250,13 +250,13 @@ class Pref_Labels extends Handler_Protected {
 
 	function index() {
 
-		$sort = db_escape_string($_REQUEST["sort"]);
+		$sort = $this->dbh->escape_string($_REQUEST["sort"]);
 
 		if (!$sort || $sort == "undefined") {
 			$sort = "caption";
 		}
 
-		$label_search = db_escape_string($_REQUEST["search"]);
+		$label_search = $this->dbh->escape_string($_REQUEST["search"]);
 
 		if (array_key_exists("search", $_REQUEST)) {
 			$_SESSION["prefs_label_search"] = $label_search;
diff --git a/classes/pref/prefs.php b/classes/pref/prefs.php
index 8e8abb5eb..b541ac875 100644
--- a/classes/pref/prefs.php
+++ b/classes/pref/prefs.php
@@ -103,13 +103,13 @@ class Pref_Prefs extends Handler_Protected {
 
 		foreach (array_keys($_POST) as $pref_name) {
 
-			$pref_name = db_escape_string($pref_name);
-			$value = db_escape_string($_POST[$pref_name]);
+			$pref_name = $this->dbh->escape_string($pref_name);
+			$value = $this->dbh->escape_string($_POST[$pref_name]);
 
 			if ($pref_name == 'DIGEST_PREFERRED_TIME') {
 				if (get_pref('DIGEST_PREFERRED_TIME') != $value) {
 
-					db_query("UPDATE ttrss_users SET
+					$this->dbh->query("UPDATE ttrss_users SET
 						last_digest_sent = NULL WHERE id = " . $_SESSION['uid']);
 
 				}
@@ -138,13 +138,13 @@ class Pref_Prefs extends Handler_Protected {
 
 	function getHelp() {
 
-		$pref_name = db_escape_string($_REQUEST["pn"]);
+		$pref_name = $this->dbh->escape_string($_REQUEST["pn"]);
 
-		$result = db_query("SELECT help_text FROM ttrss_prefs
+		$result = $this->dbh->query("SELECT help_text FROM ttrss_prefs
 			WHERE pref_name = '$pref_name'");
 
-		if (db_num_rows($result) > 0) {
-			$help_text = db_fetch_result($result, 0, "help_text");
+		if ($this->dbh->num_rows($result) > 0) {
+			$help_text = $this->dbh->fetch_result($result, 0, "help_text");
 			print $help_text;
 		} else {
 			printf(__("Unknown option: %s"), $pref_name);
@@ -153,12 +153,12 @@ class Pref_Prefs extends Handler_Protected {
 
 	function changeemail() {
 
-		$email = db_escape_string($_POST["email"]);
-		$full_name = db_escape_string($_POST["full_name"]);
+		$email = $this->dbh->escape_string($_POST["email"]);
+		$full_name = $this->dbh->escape_string($_POST["full_name"]);
 
 		$active_uid = $_SESSION["uid"];
 
-		db_query("UPDATE ttrss_users SET email = '$email',
+		$this->dbh->query("UPDATE ttrss_users SET email = '$email',
 			full_name = '$full_name' WHERE id = '$active_uid'");
 
 		print __("Your personal data has been saved.");
@@ -176,7 +176,7 @@ class Pref_Prefs extends Handler_Protected {
 			$profile_qpart = "profile IS NULL";
 		}
 
-		db_query("DELETE FROM ttrss_user_prefs
+		$this->dbh->query("DELETE FROM ttrss_user_prefs
 			WHERE $profile_qpart AND owner_uid = ".$_SESSION["uid"]);
 
 		initialize_user_prefs($_SESSION["uid"], $_SESSION["profile"]);
@@ -225,13 +225,13 @@ class Pref_Prefs extends Handler_Protected {
 
 		print "<h2>" . __("Personal data") . "</h2>";
 
-		$result = db_query("SELECT email,full_name,otp_enabled,
+		$result = $this->dbh->query("SELECT email,full_name,otp_enabled,
 			access_level FROM ttrss_users
 			WHERE id = ".$_SESSION["uid"]);
 
-		$email = htmlspecialchars(db_fetch_result($result, 0, "email"));
-		$full_name = htmlspecialchars(db_fetch_result($result, 0, "full_name"));
-		$otp_enabled = sql_bool_to_bool(db_fetch_result($result, 0, "otp_enabled"));
+		$email = htmlspecialchars($this->dbh->fetch_result($result, 0, "email"));
+		$full_name = htmlspecialchars($this->dbh->fetch_result($result, 0, "full_name"));
+		$otp_enabled = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "otp_enabled"));
 
 		print "<tr><td width=\"40%\">".__('Full name')."</td>";
 		print "<td class=\"prefValue\"><input dojoType=\"dijit.form.ValidationTextBox\" name=\"full_name\" required=\"1\"
@@ -242,7 +242,7 @@ class Pref_Prefs extends Handler_Protected {
 
 		if (!SINGLE_USER_MODE && !$_SESSION["hide_hello"]) {
 
-			$access_level = db_fetch_result($result, 0, "access_level");
+			$access_level = $this->dbh->fetch_result($result, 0, "access_level");
 			print "<tr><td width=\"40%\">".__('Access level')."</td>";
 			print "<td>" . $access_level_names[$access_level] . "</td></tr>";
 		}
@@ -270,11 +270,11 @@ class Pref_Prefs extends Handler_Protected {
 
 			print "<h2>" . __("Password") . "</h2>";
 
-			$result = db_query("SELECT id FROM ttrss_users
+			$result = $this->dbh->query("SELECT id FROM ttrss_users
 				WHERE id = ".$_SESSION["uid"]." AND pwd_hash
 				= 'SHA1:5baa61e4c9b93f3f0682250b6cf8331b7ee68fd8'");
 
-			if (db_num_rows($result) != 0) {
+			if ($this->dbh->num_rows($result) != 0) {
 				print format_warning(__("Your password is at default value, please change it."), "default_pass_warning");
 			}
 
@@ -494,7 +494,7 @@ class Pref_Prefs extends Handler_Protected {
 
 		$access_query = 'true';
 
-		$result = db_query("SELECT DISTINCT
+		$result = $this->dbh->query("SELECT DISTINCT
 			ttrss_user_prefs.pref_name,value,type_name,
 			ttrss_prefs_sections.order_id,
 			def_value,section_id
@@ -513,7 +513,7 @@ class Pref_Prefs extends Handler_Protected {
 
 		$listed_boolean_prefs = array();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 
 			if (in_array($line["pref_name"], $prefs_blacklist)) {
 				continue;
@@ -897,17 +897,17 @@ class Pref_Prefs extends Handler_Protected {
 		require_once "lib/otphp/lib/totp.php";
 		require_once "lib/phpqrcode/phpqrcode.php";
 
-		$result = db_query("SELECT login,salt,otp_enabled
+		$result = $this->dbh->query("SELECT login,salt,otp_enabled
 			FROM ttrss_users
 			WHERE id = ".$_SESSION["uid"]);
 
 		$base32 = new Base32();
 
-		$login = db_fetch_result($result, 0, "login");
-		$otp_enabled = sql_bool_to_bool(db_fetch_result($result, 0, "otp_enabled"));
+		$login = $this->dbh->fetch_result($result, 0, "login");
+		$otp_enabled = sql_bool_to_bool($this->dbh->fetch_result($result, 0, "otp_enabled"));
 
 		if (!$otp_enabled) {
-			$secret = $base32->encode(sha1(db_fetch_result($result, 0, "salt")));
+			$secret = $base32->encode(sha1($this->dbh->fetch_result($result, 0, "salt")));
 			$topt = new \OTPHP\TOTP($secret);
 			print QRcode::png($topt->provisioning_uri($login));
 		}
@@ -926,19 +926,19 @@ class Pref_Prefs extends Handler_Protected {
 
 		if ($authenticator->check_password($_SESSION["uid"], $password)) {
 
-			$result = db_query("SELECT salt
+			$result = $this->dbh->query("SELECT salt
 				FROM ttrss_users
 				WHERE id = ".$_SESSION["uid"]);
 
 			$base32 = new Base32();
 
-			$secret = $base32->encode(sha1(db_fetch_result($result, 0, "salt")));
+			$secret = $base32->encode(sha1($this->dbh->fetch_result($result, 0, "salt")));
 			$topt = new \OTPHP\TOTP($secret);
 
 			$otp_check = $topt->now();
 
 			if ($otp == $otp_check) {
-				db_query("UPDATE ttrss_users SET otp_enabled = true WHERE
+				$this->dbh->query("UPDATE ttrss_users SET otp_enabled = true WHERE
 					id = " . $_SESSION["uid"]);
 
 				print "OK";
@@ -952,14 +952,14 @@ class Pref_Prefs extends Handler_Protected {
 	}
 
 	function otpdisable() {
-		$password = db_escape_string($_REQUEST["password"]);
+		$password = $this->dbh->escape_string($_REQUEST["password"]);
 
 		global $pluginhost;
 		$authenticator = $pluginhost->get_plugin($_SESSION["auth_module"]);
 
 		if ($authenticator->check_password($_SESSION["uid"], $password)) {
 
-			db_query("UPDATE ttrss_users SET otp_enabled = false WHERE
+			$this->dbh->query("UPDATE ttrss_users SET otp_enabled = false WHERE
 				id = " . $_SESSION["uid"]);
 
 			print "OK";
@@ -979,7 +979,7 @@ class Pref_Prefs extends Handler_Protected {
 	}
 
 	function clearplugindata() {
-		$name = db_escape_string($_REQUEST["name"]);
+		$name = $this->dbh->escape_string($_REQUEST["name"]);
 
 		global $pluginhost;
 		$pluginhost->clear_data($pluginhost->get_plugin($name));
@@ -1034,7 +1034,7 @@ class Pref_Prefs extends Handler_Protected {
 
 		print "</div>";
 
-		$result = db_query("SELECT title,id FROM ttrss_settings_profiles
+		$result = $this->dbh->query("SELECT title,id FROM ttrss_settings_profiles
 			WHERE owner_uid = ".$_SESSION["uid"]." ORDER BY title");
 
 		print "<div class=\"prefProfileHolder\">";
@@ -1065,7 +1065,7 @@ class Pref_Prefs extends Handler_Protected {
 
 		$lnum = 1;
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 
 			$class = ($lnum % 2) ? "even" : "odd";
 
diff --git a/classes/pref/system.php b/classes/pref/system.php
index 23f5a4328..3d82b8fff 100644
--- a/classes/pref/system.php
+++ b/classes/pref/system.php
@@ -24,7 +24,7 @@ class Pref_System extends Handler_Protected {
 		print "<div dojoType=\"dijit.layout.AccordionContainer\" region=\"center\">";
 		print "<div dojoType=\"dijit.layout.AccordionPane\" title=\"".__('Error Log')."\">";
 
-		$result = db_query("SELECT errno, errstr, filename, lineno,
+		$result = $this->dbh->query("SELECT errno, errstr, filename, lineno,
 			created_at, login FROM ttrss_error_log
 			LEFT JOIN ttrss_users ON (owner_uid = ttrss_users.id)
 			ORDER BY ttrss_error_log.id DESC
@@ -43,7 +43,7 @@ class Pref_System extends Handler_Protected {
 			<td width='5%'>".__("Date")."</td>
 			</tr>";
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			print "<tr class=\"errrow\">";
 
 			foreach ($line as $k => $v) {
diff --git a/classes/pref/users.php b/classes/pref/users.php
index 7541625fd..d483c771b 100644
--- a/classes/pref/users.php
+++ b/classes/pref/users.php
@@ -21,7 +21,7 @@ class Pref_Users extends Handler_Protected {
 
 			$uid = sprintf("%d", $_REQUEST["id"]);
 
-			$result = db_query("SELECT login,
+			$result = $this->dbh->query("SELECT login,
 				".SUBSTRING_FOR_DATE."(last_login,1,16) AS last_login,
 				access_level,
 				(SELECT COUNT(int_id) FROM ttrss_user_entries
@@ -30,33 +30,33 @@ class Pref_Users extends Handler_Protected {
 				FROM ttrss_users
 				WHERE id = '$uid'");
 
-			if (db_num_rows($result) == 0) {
+			if ($this->dbh->num_rows($result) == 0) {
 				print "<h1>".__('User not found')."</h1>";
 				return;
 			}
 
 			// print "<h1>User Details</h1>";
 
-			$login = db_fetch_result($result, 0, "login");
+			$login = $this->dbh->fetch_result($result, 0, "login");
 
 			print "<table width='100%'>";
 
 			$last_login = make_local_datetime(
-				db_fetch_result($result, 0, "last_login"), true);
+				$this->dbh->fetch_result($result, 0, "last_login"), true);
 
 			$created = make_local_datetime(
-				db_fetch_result($result, 0, "created"), true);
+				$this->dbh->fetch_result($result, 0, "created"), true);
 
-			$access_level = db_fetch_result($result, 0, "access_level");
-			$stored_articles = db_fetch_result($result, 0, "stored_articles");
+			$access_level = $this->dbh->fetch_result($result, 0, "access_level");
+			$stored_articles = $this->dbh->fetch_result($result, 0, "stored_articles");
 
 			print "<tr><td>".__('Registered')."</td><td>$created</td></tr>";
 			print "<tr><td>".__('Last logged in')."</td><td>$last_login</td></tr>";
 
-			$result = db_query("SELECT COUNT(id) as num_feeds FROM ttrss_feeds
+			$result = $this->dbh->query("SELECT COUNT(id) as num_feeds FROM ttrss_feeds
 				WHERE owner_uid = '$uid'");
 
-			$num_feeds = db_fetch_result($result, 0, "num_feeds");
+			$num_feeds = $this->dbh->fetch_result($result, 0, "num_feeds");
 
 			print "<tr><td>".__('Subscribed feeds count')."</td><td>$num_feeds</td></tr>";
 
@@ -64,14 +64,14 @@ class Pref_Users extends Handler_Protected {
 
 			print "<h1>".__('Subscribed feeds')."</h1>";
 
-			$result = db_query("SELECT id,title,site_url FROM ttrss_feeds
+			$result = $this->dbh->query("SELECT id,title,site_url FROM ttrss_feeds
 				WHERE owner_uid = '$uid' ORDER BY title");
 
 			print "<ul class=\"userFeedList\">";
 
 			$row_class = "odd";
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 
 				$icon_file = ICONS_URL."/".$line["id"].".ico";
 
@@ -87,7 +87,7 @@ class Pref_Users extends Handler_Protected {
 
 			}
 
-			if (db_num_rows($result) < $num_feeds) {
+			if ($this->dbh->num_rows($result) < $num_feeds) {
 				// FIXME - add link to show ALL subscribed feeds here somewhere
 				print "<li><img
 					class=\"tinyFeedIcon\" src=\"images/blank_icon.gif\">&nbsp;...</li>";
@@ -105,18 +105,18 @@ class Pref_Users extends Handler_Protected {
 		function edit() {
 			global $access_level_names;
 
-			$id = db_escape_string($_REQUEST["id"]);
+			$id = $this->dbh->escape_string($_REQUEST["id"]);
 			print "<form id=\"user_edit_form\" onsubmit='return false'>";
 
 			print "<input type=\"hidden\" name=\"id\" value=\"$id\">";
 			print "<input type=\"hidden\" name=\"op\" value=\"pref-users\">";
 			print "<input type=\"hidden\" name=\"method\" value=\"editSave\">";
 
-			$result = db_query("SELECT * FROM ttrss_users WHERE id = '$id'");
+			$result = $this->dbh->query("SELECT * FROM ttrss_users WHERE id = '$id'");
 
-			$login = db_fetch_result($result, 0, "login");
-			$access_level = db_fetch_result($result, 0, "access_level");
-			$email = db_fetch_result($result, 0, "email");
+			$login = $this->dbh->fetch_result($result, 0, "login");
+			$access_level = $this->dbh->fetch_result($result, 0, "access_level");
+			$email = $this->dbh->fetch_result($result, 0, "email");
 
 			$sel_disabled = ($id == $_SESSION["uid"]) ? "disabled" : "";
 
@@ -181,10 +181,10 @@ class Pref_Users extends Handler_Protected {
 		}
 
 		function editSave() {
-			$login = db_escape_string(trim($_REQUEST["login"]));
-			$uid = db_escape_string($_REQUEST["id"]);
+			$login = $this->dbh->escape_string(trim($_REQUEST["login"]));
+			$uid = $this->dbh->escape_string($_REQUEST["id"]);
 			$access_level = (int) $_REQUEST["access_level"];
-			$email = db_escape_string(trim($_REQUEST["email"]));
+			$email = $this->dbh->escape_string(trim($_REQUEST["email"]));
 			$password = $_REQUEST["password"];
 
 			if ($password) {
@@ -195,47 +195,47 @@ class Pref_Users extends Handler_Protected {
 				$pass_query_part = "";
 			}
 
-			db_query("UPDATE ttrss_users SET $pass_query_part login = '$login',
+			$this->dbh->query("UPDATE ttrss_users SET $pass_query_part login = '$login',
 				access_level = '$access_level', email = '$email', otp_enabled = false
 				WHERE id = '$uid'");
 
 		}
 
 		function remove() {
-			$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+			$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
 			foreach ($ids as $id) {
 				if ($id != $_SESSION["uid"] && $id != 1) {
-					db_query("DELETE FROM ttrss_tags WHERE owner_uid = '$id'");
-					db_query("DELETE FROM ttrss_feeds WHERE owner_uid = '$id'");
-					db_query("DELETE FROM ttrss_users WHERE id = '$id'");
+					$this->dbh->query("DELETE FROM ttrss_tags WHERE owner_uid = '$id'");
+					$this->dbh->query("DELETE FROM ttrss_feeds WHERE owner_uid = '$id'");
+					$this->dbh->query("DELETE FROM ttrss_users WHERE id = '$id'");
 				}
 			}
 		}
 
 		function add() {
 
-			$login = db_escape_string(trim($_REQUEST["login"]));
+			$login = $this->dbh->escape_string(trim($_REQUEST["login"]));
 			$tmp_user_pwd = make_password(8);
 			$salt = substr(bin2hex(get_random_bytes(125)), 0, 250);
 			$pwd_hash = encrypt_password($tmp_user_pwd, $salt, true);
 
-			$result = db_query("SELECT id FROM ttrss_users WHERE
+			$result = $this->dbh->query("SELECT id FROM ttrss_users WHERE
 				login = '$login'");
 
-			if (db_num_rows($result) == 0) {
+			if ($this->dbh->num_rows($result) == 0) {
 
-				db_query("INSERT INTO ttrss_users
+				$this->dbh->query("INSERT INTO ttrss_users
 					(login,pwd_hash,access_level,last_login,created, salt)
 					VALUES ('$login', '$pwd_hash', 0, null, NOW(), '$salt')");
 
 
-				$result = db_query("SELECT id FROM ttrss_users WHERE
+				$result = $this->dbh->query("SELECT id FROM ttrss_users WHERE
 					login = '$login' AND pwd_hash = '$pwd_hash'");
 
-				if (db_num_rows($result) == 1) {
+				if ($this->dbh->num_rows($result) == 1) {
 
-					$new_uid = db_fetch_result($result, 0, "id");
+					$new_uid = $this->dbh->fetch_result($result, 0, "id");
 
 					print format_notice(T_sprintf("Added user <b>%s</b> with password <b>%s</b>",
 						$login, $tmp_user_pwd));
@@ -304,7 +304,7 @@ class Pref_Users extends Handler_Protected {
 		}
 
 		function resetPass() {
-			$uid = db_escape_string($_REQUEST["id"]);
+			$uid = $this->dbh->escape_string($_REQUEST["id"]);
 			Pref_Users::resetUserPassword($uid, true);
 		}
 
@@ -317,7 +317,7 @@ class Pref_Users extends Handler_Protected {
 
 			print "<div id=\"pref-user-toolbar\" dojoType=\"dijit.Toolbar\">";
 
-			$user_search = db_escape_string($_REQUEST["search"]);
+			$user_search = $this->dbh->escape_string($_REQUEST["search"]);
 
 			if (array_key_exists("search", $_REQUEST)) {
 				$_SESSION["prefs_user_search"] = $user_search;
@@ -332,7 +332,7 @@ class Pref_Users extends Handler_Protected {
 					__('Search')."</button>
 				</div>";
 
-			$sort = db_escape_string($_REQUEST["sort"]);
+			$sort = $this->dbh->escape_string($_REQUEST["sort"]);
 
 			if (!$sort || $sort == "undefined") {
 				$sort = "login";
@@ -381,7 +381,7 @@ class Pref_Users extends Handler_Protected {
 				$user_search_query = "";
 			}
 
-			$result = db_query("SELECT
+			$result = $this->dbh->query("SELECT
 					id,login,access_level,email,
 					".SUBSTRING_FOR_DATE."(last_login,1,16) as last_login,
 					".SUBSTRING_FOR_DATE."(created,1,16) as created
@@ -392,7 +392,7 @@ class Pref_Users extends Handler_Protected {
 					id > 0
 				ORDER BY $sort");
 
-			if (db_num_rows($result) > 0) {
+			if ($this->dbh->num_rows($result) > 0) {
 
 			print "<p><table width=\"100%\" cellspacing=\"0\"
 				class=\"prefUserList\" id=\"prefUserList\">";
@@ -406,7 +406,7 @@ class Pref_Users extends Handler_Protected {
 
 			$lnum = 0;
 
-			while ($line = db_fetch_assoc($result)) {
+			while ($line = $this->dbh->fetch_assoc($result)) {
 
 				$class = ($lnum % 2) ? "even" : "odd";
 
diff --git a/classes/rpc.php b/classes/rpc.php
index 3b753f118..51c195f11 100644
--- a/classes/rpc.php
+++ b/classes/rpc.php
@@ -8,18 +8,18 @@ class RPC extends Handler_Protected {
 	}
 
 	function setprofile() {
-		$id = db_escape_string($_REQUEST["id"]);
+		$id = $this->dbh->escape_string($_REQUEST["id"]);
 
 		$_SESSION["profile"] = $id;
 		$_SESSION["prefs_cache"] = array();
 	}
 
 	function remprofiles() {
-		$ids = explode(",", db_escape_string(trim($_REQUEST["ids"])));
+		$ids = explode(",", $this->dbh->escape_string(trim($_REQUEST["ids"])));
 
 		foreach ($ids as $id) {
 			if ($_SESSION["profile"] != $id) {
-				db_query("DELETE FROM ttrss_settings_profiles WHERE id = '$id' AND
+				$this->dbh->query("DELETE FROM ttrss_settings_profiles WHERE id = '$id' AND
 							owner_uid = " . $_SESSION["uid"]);
 			}
 		}
@@ -27,23 +27,23 @@ class RPC extends Handler_Protected {
 
 	// Silent
 	function addprofile() {
-		$title = db_escape_string(trim($_REQUEST["title"]));
+		$title = $this->dbh->escape_string(trim($_REQUEST["title"]));
 		if ($title) {
-			db_query("BEGIN");
+			$this->dbh->query("BEGIN");
 
-			$result = db_query("SELECT id FROM ttrss_settings_profiles
+			$result = $this->dbh->query("SELECT id FROM ttrss_settings_profiles
 				WHERE title = '$title' AND owner_uid = " . $_SESSION["uid"]);
 
-			if (db_num_rows($result) == 0) {
+			if ($this->dbh->num_rows($result) == 0) {
 
-				db_query("INSERT INTO ttrss_settings_profiles (title, owner_uid)
+				$this->dbh->query("INSERT INTO ttrss_settings_profiles (title, owner_uid)
 							VALUES ('$title', ".$_SESSION["uid"] .")");
 
-				$result = db_query("SELECT id FROM ttrss_settings_profiles WHERE
+				$result = $this->dbh->query("SELECT id FROM ttrss_settings_profiles WHERE
 					title = '$title'");
 
-				if (db_num_rows($result) != 0) {
-					$profile_id = db_fetch_result($result, 0, "id");
+				if ($this->dbh->num_rows($result) != 0) {
+					$profile_id = $this->dbh->fetch_result($result, 0, "id");
 
 					if ($profile_id) {
 						initialize_user_prefs($_SESSION["uid"], $profile_id);
@@ -51,14 +51,14 @@ class RPC extends Handler_Protected {
 				}
 			}
 
-			db_query("COMMIT");
+			$this->dbh->query("COMMIT");
 		}
 	}
 
 	// Silent
 	function saveprofile() {
-		$id = db_escape_string($_REQUEST["id"]);
-		$title = db_escape_string(trim($_REQUEST["value"]));
+		$id = $this->dbh->escape_string($_REQUEST["id"]);
+		$title = $this->dbh->escape_string(trim($_REQUEST["value"]));
 
 		if ($id == 0) {
 			print __("Default profile");
@@ -66,44 +66,44 @@ class RPC extends Handler_Protected {
 		}
 
 		if ($title) {
-			db_query("BEGIN");
+			$this->dbh->query("BEGIN");
 
-			$result = db_query("SELECT id FROM ttrss_settings_profiles
+			$result = $this->dbh->query("SELECT id FROM ttrss_settings_profiles
 				WHERE title = '$title' AND owner_uid =" . $_SESSION["uid"]);
 
-			if (db_num_rows($result) == 0) {
-				db_query("UPDATE ttrss_settings_profiles
+			if ($this->dbh->num_rows($result) == 0) {
+				$this->dbh->query("UPDATE ttrss_settings_profiles
 							SET title = '$title' WHERE id = '$id' AND
 							owner_uid = " . $_SESSION["uid"]);
 				print $title;
 			} else {
-				$result = db_query("SELECT title FROM ttrss_settings_profiles
+				$result = $this->dbh->query("SELECT title FROM ttrss_settings_profiles
 							WHERE id = '$id' AND owner_uid =" . $_SESSION["uid"]);
-				print db_fetch_result($result, 0, "title");
+				print $this->dbh->fetch_result($result, 0, "title");
 			}
 
-			db_query("COMMIT");
+			$this->dbh->query("COMMIT");
 		}
 	}
 
 	// Silent
 	function remarchive() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
 		foreach ($ids as $id) {
-			$result = db_query("DELETE FROM ttrss_archived_feeds WHERE
+			$result = $this->dbh->query("DELETE FROM ttrss_archived_feeds WHERE
 		(SELECT COUNT(*) FROM ttrss_user_entries
 							WHERE orig_feed_id = '$id') = 0 AND
 		id = '$id' AND owner_uid = ".$_SESSION["uid"]);
 
-			$rc = db_affected_rows($result);
+			$rc = $this->dbh->affected_rows($result);
 		}
 	}
 
 	function addfeed() {
-		$feed = db_escape_string($_REQUEST['feed']);
-		$cat = db_escape_string($_REQUEST['cat']);
-		$login = db_escape_string($_REQUEST['login']);
+		$feed = $this->dbh->escape_string($_REQUEST['feed']);
+		$cat = $this->dbh->escape_string($_REQUEST['cat']);
+		$login = $this->dbh->escape_string($_REQUEST['login']);
 		$pass = trim($_REQUEST['pass']); // escaped later
 
 		$rc = subscribe_to_feed($feed, $cat, $login, $pass);
@@ -112,7 +112,7 @@ class RPC extends Handler_Protected {
 	}
 
 	function togglepref() {
-		$key = db_escape_string($_REQUEST["key"]);
+		$key = $this->dbh->escape_string($_REQUEST["key"]);
 		set_pref($key, !get_pref($key));
 		$value = get_pref($key);
 
@@ -131,7 +131,7 @@ class RPC extends Handler_Protected {
 
 	function mark() {
 		$mark = $_REQUEST["mark"];
-		$id = db_escape_string($_REQUEST["id"]);
+		$id = $this->dbh->escape_string($_REQUEST["id"]);
 
 		if ($mark == "1") {
 			$mark = "true";
@@ -139,7 +139,7 @@ class RPC extends Handler_Protected {
 			$mark = "false";
 		}
 
-		$result = db_query("UPDATE ttrss_user_entries SET marked = $mark,
+		$result = $this->dbh->query("UPDATE ttrss_user_entries SET marked = $mark,
 					last_marked = NOW()
 					WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 
@@ -147,9 +147,9 @@ class RPC extends Handler_Protected {
 	}
 
 	function delete() {
-		$ids = db_escape_string($_REQUEST["ids"]);
+		$ids = $this->dbh->escape_string($_REQUEST["ids"]);
 
-		$result = db_query("DELETE FROM ttrss_user_entries
+		$result = $this->dbh->query("DELETE FROM ttrss_user_entries
 		WHERE ref_id IN ($ids) AND owner_uid = " . $_SESSION["uid"]);
 
 		purge_orphans();
@@ -161,26 +161,26 @@ class RPC extends Handler_Protected {
 		$ids = explode(",", $_REQUEST["ids"]);
 
 		foreach ($ids as $id) {
-			$id = db_escape_string(trim($id));
-			db_query("BEGIN");
+			$id = $this->dbh->escape_string(trim($id));
+			$this->dbh->query("BEGIN");
 
-			$result = db_query("SELECT feed_url,site_url,title FROM ttrss_archived_feeds
+			$result = $this->dbh->query("SELECT feed_url,site_url,title FROM ttrss_archived_feeds
 				WHERE id = (SELECT orig_feed_id FROM ttrss_user_entries WHERE ref_id = $id
 				AND owner_uid = ".$_SESSION["uid"].")");
 
-			if (db_num_rows($result) != 0) {
-				$feed_url = db_escape_string(db_fetch_result($result, 0, "feed_url"));
-				$site_url = db_escape_string(db_fetch_result($result, 0, "site_url"));
-				$title = db_escape_string(db_fetch_result($result, 0, "title"));
+			if ($this->dbh->num_rows($result) != 0) {
+				$feed_url = $this->dbh->escape_string(db_fetch_result($result, 0, "feed_url"));
+				$site_url = $this->dbh->escape_string(db_fetch_result($result, 0, "site_url"));
+				$title = $this->dbh->escape_string(db_fetch_result($result, 0, "title"));
 
-				$result = db_query("SELECT id FROM ttrss_feeds WHERE feed_url = '$feed_url'
+				$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE feed_url = '$feed_url'
 					AND owner_uid = " .$_SESSION["uid"]);
 
-				if (db_num_rows($result) == 0) {
+				if ($this->dbh->num_rows($result) == 0) {
 
 					if (!$title) $title = '[Unknown]';
 
-					$result = db_query(
+					$result = $this->dbh->query(
 						"INSERT INTO ttrss_feeds
 							(owner_uid,feed_url,site_url,title,cat_id,auth_login,auth_pass,update_method)
 							VALUES (".$_SESSION["uid"].",
@@ -189,33 +189,33 @@ class RPC extends Handler_Protected {
 							'$title',
 							NULL, '', '', 0)");
 
-					$result = db_query(
+					$result = $this->dbh->query(
 						"SELECT id FROM ttrss_feeds WHERE feed_url = '$feed_url'
 						AND owner_uid = ".$_SESSION["uid"]);
 
-					if (db_num_rows($result) != 0) {
-						$feed_id = db_fetch_result($result, 0, "id");
+					if ($this->dbh->num_rows($result) != 0) {
+						$feed_id = $this->dbh->fetch_result($result, 0, "id");
 					}
 
 				} else {
-					$feed_id = db_fetch_result($result, 0, "id");
+					$feed_id = $this->dbh->fetch_result($result, 0, "id");
 				}
 
 				if ($feed_id) {
-					$result = db_query("UPDATE ttrss_user_entries
+					$result = $this->dbh->query("UPDATE ttrss_user_entries
 						SET feed_id = '$feed_id', orig_feed_id = NULL
 						WHERE ref_id = $id AND owner_uid = " . $_SESSION["uid"]);
 				}
 			}
 
-			db_query("COMMIT");
+			$this->dbh->query("COMMIT");
 		}
 
 		print json_encode(array("message" => "UPDATE_COUNTERS"));
 	}
 
 	function archive() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 
 		foreach ($ids as $id) {
 			$this->archive_article($id, $_SESSION["uid"]);
@@ -225,41 +225,41 @@ class RPC extends Handler_Protected {
 	}
 
 	private function archive_article($id, $owner_uid) {
-		db_query("BEGIN");
+		$this->dbh->query("BEGIN");
 
-		$result = db_query("SELECT feed_id FROM ttrss_user_entries
+		$result = $this->dbh->query("SELECT feed_id FROM ttrss_user_entries
 			WHERE ref_id = '$id' AND owner_uid = $owner_uid");
 
-		if (db_num_rows($result) != 0) {
+		if ($this->dbh->num_rows($result) != 0) {
 
 			/* prepare the archived table */
 
-			$feed_id = (int) db_fetch_result($result, 0, "feed_id");
+			$feed_id = (int) $this->dbh->fetch_result($result, 0, "feed_id");
 
 			if ($feed_id) {
-				$result = db_query("SELECT id FROM ttrss_archived_feeds
+				$result = $this->dbh->query("SELECT id FROM ttrss_archived_feeds
 					WHERE id = '$feed_id'");
 
-				if (db_num_rows($result) == 0) {
-					db_query("INSERT INTO ttrss_archived_feeds
+				if ($this->dbh->num_rows($result) == 0) {
+					$this->dbh->query("INSERT INTO ttrss_archived_feeds
 						(id, owner_uid, title, feed_url, site_url)
 					SELECT id, owner_uid, title, feed_url, site_url from ttrss_feeds
 				  	WHERE id = '$feed_id'");
 				}
 
-				db_query("UPDATE ttrss_user_entries
+				$this->dbh->query("UPDATE ttrss_user_entries
 					SET orig_feed_id = feed_id, feed_id = NULL
 					WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 			}
 		}
 
-		db_query("COMMIT");
+		$this->dbh->query("COMMIT");
 	}
 
 	function publ() {
 		$pub = $_REQUEST["pub"];
-		$id = db_escape_string($_REQUEST["id"]);
-		$note = trim(strip_tags(db_escape_string($_REQUEST["note"])));
+		$id = $this->dbh->escape_string($_REQUEST["id"]);
+		$note = trim(strip_tags($this->dbh->escape_string($_REQUEST["note"])));
 
 		if ($pub == "1") {
 			$pub = "true";
@@ -267,7 +267,7 @@ class RPC extends Handler_Protected {
 			$pub = "false";
 		}
 
-		$result = db_query("UPDATE ttrss_user_entries SET
+		$result = $this->dbh->query("UPDATE ttrss_user_entries SET
 			published = $pub, last_published = NOW()
 			WHERE ref_id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 
@@ -305,7 +305,7 @@ class RPC extends Handler_Protected {
 
 	/* GET["cmode"] = 0 - mark as read, 1 - as unread, 2 - toggle */
 	function catchupSelected() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 		$cmode = sprintf("%d", $_REQUEST["cmode"]);
 
 		catchupArticlesById($ids, $cmode);
@@ -314,7 +314,7 @@ class RPC extends Handler_Protected {
 	}
 
 	function markSelected() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 		$cmode = sprintf("%d", $_REQUEST["cmode"]);
 
 		$this->markArticlesById($ids, $cmode);
@@ -323,7 +323,7 @@ class RPC extends Handler_Protected {
 	}
 
 	function publishSelected() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 		$cmode = sprintf("%d", $_REQUEST["cmode"]);
 
 		$this->publishArticlesById($ids, $cmode);
@@ -349,40 +349,40 @@ class RPC extends Handler_Protected {
 	}
 
 	function completeLabels() {
-		$search = db_escape_string($_REQUEST["search"]);
+		$search = $this->dbh->escape_string($_REQUEST["search"]);
 
-		$result = db_query("SELECT DISTINCT caption FROM
+		$result = $this->dbh->query("SELECT DISTINCT caption FROM
 				ttrss_labels2
 				WHERE owner_uid = '".$_SESSION["uid"]."' AND
 				LOWER(caption) LIKE LOWER('$search%') ORDER BY caption
 				LIMIT 5");
 
 		print "<ul>";
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			print "<li>" . $line["caption"] . "</li>";
 		}
 		print "</ul>";
 	}
 
 	function purge() {
-		$ids = explode(",", db_escape_string($_REQUEST["ids"]));
+		$ids = explode(",", $this->dbh->escape_string($_REQUEST["ids"]));
 		$days = sprintf("%d", $_REQUEST["days"]);
 
 		foreach ($ids as $id) {
 
-			$result = db_query("SELECT id FROM ttrss_feeds WHERE
+			$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE
 				id = '$id' AND owner_uid = ".$_SESSION["uid"]);
 
-			if (db_num_rows($result) == 1) {
+			if ($this->dbh->num_rows($result) == 1) {
 				purge_feed($id, $days);
 			}
 		}
 	}
 
 	function updateFeedBrowser() {
-		$search = db_escape_string($_REQUEST["search"]);
-		$limit = db_escape_string($_REQUEST["limit"]);
-		$mode = (int) db_escape_string($_REQUEST["mode"]);
+		$search = $this->dbh->escape_string($_REQUEST["search"]);
+		$limit = $this->dbh->escape_string($_REQUEST["limit"]);
+		$mode = (int) $this->dbh->escape_string($_REQUEST["mode"]);
 
 		require_once "feedbrowser.php";
 
@@ -402,14 +402,14 @@ class RPC extends Handler_Protected {
 		if ($mode == 1) {
 			foreach ($payload as $feed) {
 
-				$title = db_escape_string($feed[0]);
-				$feed_url = db_escape_string($feed[1]);
+				$title = $this->dbh->escape_string($feed[0]);
+				$feed_url = $this->dbh->escape_string($feed[1]);
 
-				$result = db_query("SELECT id FROM ttrss_feeds WHERE
+				$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE
 					feed_url = '$feed_url' AND owner_uid = " . $_SESSION["uid"]);
 
-				if (db_num_rows($result) == 0) {
-					$result = db_query("INSERT INTO ttrss_feeds
+				if ($this->dbh->num_rows($result) == 0) {
+					$result = $this->dbh->query("INSERT INTO ttrss_feeds
 									(owner_uid,feed_url,title,cat_id,site_url)
 									VALUES ('".$_SESSION["uid"]."',
 									'$feed_url', '$title', NULL, '')");
@@ -418,19 +418,19 @@ class RPC extends Handler_Protected {
 		} else if ($mode == 2) {
 			// feed archive
 			foreach ($payload as $id) {
-				$result = db_query("SELECT * FROM ttrss_archived_feeds
+				$result = $this->dbh->query("SELECT * FROM ttrss_archived_feeds
 					WHERE id = '$id' AND owner_uid = " . $_SESSION["uid"]);
 
-				if (db_num_rows($result) != 0) {
-					$site_url = db_escape_string(db_fetch_result($result, 0, "site_url"));
-					$feed_url = db_escape_string(db_fetch_result($result, 0, "feed_url"));
-					$title = db_escape_string(db_fetch_result($result, 0, "title"));
+				if ($this->dbh->num_rows($result) != 0) {
+					$site_url = $this->dbh->escape_string(db_fetch_result($result, 0, "site_url"));
+					$feed_url = $this->dbh->escape_string(db_fetch_result($result, 0, "feed_url"));
+					$title = $this->dbh->escape_string(db_fetch_result($result, 0, "title"));
 
-					$result = db_query("SELECT id FROM ttrss_feeds WHERE
+					$result = $this->dbh->query("SELECT id FROM ttrss_feeds WHERE
 						feed_url = '$feed_url' AND owner_uid = " . $_SESSION["uid"]);
 
-					if (db_num_rows($result) == 0) {
-						$result = db_query("INSERT INTO ttrss_feeds
+					if ($this->dbh->num_rows($result) == 0) {
+						$result = $this->dbh->query("INSERT INTO ttrss_feeds
 										(owner_uid,feed_url,title,cat_id,site_url)
 									VALUES ('$id','".$_SESSION["uid"]."',
 									'$feed_url', '$title', NULL, '$site_url')");
@@ -441,9 +441,9 @@ class RPC extends Handler_Protected {
 	}
 
 	function catchupFeed() {
-		$feed_id = db_escape_string($_REQUEST['feed_id']);
-		$is_cat = db_escape_string($_REQUEST['is_cat']) == "true";
-		$mode = db_escape_string($_REQUEST['mode']);
+		$feed_id = $this->dbh->escape_string($_REQUEST['feed_id']);
+		$is_cat = $this->dbh->escape_string($_REQUEST['is_cat']) == "true";
+		$mode = $this->dbh->escape_string($_REQUEST['mode']);
 
 		catchup_feed($feed_id, $is_cat, false, false, $mode);
 
@@ -451,15 +451,15 @@ class RPC extends Handler_Protected {
 	}
 
 	function quickAddCat() {
-		$cat = db_escape_string($_REQUEST["cat"]);
+		$cat = $this->dbh->escape_string($_REQUEST["cat"]);
 
 		add_feed_category($cat);
 
-		$result = db_query("SELECT id FROM ttrss_feed_categories WHERE
+		$result = $this->dbh->query("SELECT id FROM ttrss_feed_categories WHERE
 			title = '$cat' AND owner_uid = " . $_SESSION["uid"]);
 
-		if (db_num_rows($result) == 1) {
-			$id = db_fetch_result($result, 0, "id");
+		if ($this->dbh->num_rows($result) == 1) {
+			$id = $this->dbh->fetch_result($result, 0, "id");
 		} else {
 			$id = 0;
 		}
@@ -469,7 +469,7 @@ class RPC extends Handler_Protected {
 
 	// Silent
 	function clearArticleKeys() {
-		db_query("UPDATE ttrss_user_entries SET uuid = '' WHERE
+		$this->dbh->query("UPDATE ttrss_user_entries SET uuid = '' WHERE
 			owner_uid = " . $_SESSION["uid"]);
 
 		return;
@@ -516,7 +516,7 @@ class RPC extends Handler_Protected {
 		$random_qpart = sql_random_function();
 
 		// We search for feed needing update.
-		$result = db_query("SELECT ttrss_feeds.feed_url,ttrss_feeds.id
+		$result = $this->dbh->query("SELECT ttrss_feeds.feed_url,ttrss_feeds.id
 			FROM
 				ttrss_feeds, ttrss_users, ttrss_user_prefs
 			WHERE
@@ -535,7 +535,7 @@ class RPC extends Handler_Protected {
 
 		$tstart = time();
 
-		while ($line = db_fetch_assoc($result)) {
+		while ($line = $this->dbh->fetch_assoc($result)) {
 			$feed_id = $line["id"];
 
 			if (time() - $tstart < ini_get("max_execution_time") * 0.7) {
@@ -570,15 +570,15 @@ class RPC extends Handler_Protected {
 		$ids_qpart = join(" OR ", $tmp_ids);
 
 		if ($cmode == 0) {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			marked = false, last_marked = NOW()
 			WHERE ($ids_qpart) AND owner_uid = " . $_SESSION["uid"]);
 		} else if ($cmode == 1) {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			marked = true, last_marked = NOW()
 			WHERE ($ids_qpart) AND owner_uid = " . $_SESSION["uid"]);
 		} else {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			marked = NOT marked,last_marked = NOW()
 			WHERE ($ids_qpart) AND owner_uid = " . $_SESSION["uid"]);
 		}
@@ -595,15 +595,15 @@ class RPC extends Handler_Protected {
 		$ids_qpart = join(" OR ", $tmp_ids);
 
 		if ($cmode == 0) {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			published = false,last_published = NOW()
 			WHERE ($ids_qpart) AND owner_uid = " . $_SESSION["uid"]);
 		} else if ($cmode == 1) {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			published = true,last_published = NOW()
 			WHERE ($ids_qpart) AND owner_uid = " . $_SESSION["uid"]);
 		} else {
-			db_query("UPDATE ttrss_user_entries SET
+			$this->dbh->query("UPDATE ttrss_user_entries SET
 			published = NOT published,last_published = NOW()
 			WHERE ($ids_qpart) AND owner_uid = " . $_SESSION["uid"]);
 		}
@@ -620,14 +620,14 @@ class RPC extends Handler_Protected {
 	}
 
 	function getlinktitlebyid() {
-		$id = db_escape_string($_REQUEST['id']);
+		$id = $this->dbh->escape_string($_REQUEST['id']);
 
-		$result = db_query("SELECT link, title FROM ttrss_entries, ttrss_user_entries
+		$result = $this->dbh->query("SELECT link, title FROM ttrss_entries, ttrss_user_entries
 			WHERE ref_id = '$id' AND ref_id = id AND owner_uid = ". $_SESSION["uid"]);
 
-		if (db_num_rows($result) != 0) {
-			$link = db_fetch_result($result, 0, "link");
-			$title = db_fetch_result($result, 0, "title");
+		if ($this->dbh->num_rows($result) != 0) {
+			$link = $this->dbh->fetch_result($result, 0, "link");
+			$title = $this->dbh->fetch_result($result, 0, "title");
 
 			echo json_encode(array("link" => $link, "title" => $title));
 		} else {