add experimental support for PDO (_ENABLE_PDO)

classes/db.php

@@ -8,7 +8,7 @@ class Db implements IDb {
 
 		$er = error_reporting(E_ALL);
 
-		if (class_exists("PDO")) {
+		if (defined('_ENABLE_PDO') && _ENABLE_PDO && class_exists("PDO")) {
 			$this->adapter = new Db_PDO();
 		} else {
 			switch (DB_TYPE) {

classes/db/pdo.php

@@ -24,7 +24,7 @@ class Db_PDO implements IDb {
 
 	function query($query, $die_on_error = true) {
 		try {
-			return $this->pdo->query($query);
+			return new Db_Stmt($this->pdo->query($query));
 		} catch (PDOException $e) {
 			user_error($e->getMessage(), $die_on_error ? E_USER_ERROR : E_USER_WARNING);
 		}
@@ -55,13 +55,7 @@ class Db_PDO implements IDb {
 	}
 
 	function fetch_result($result, $row, $param) {
-		$line = $this->fetch_assoc($result);
-
-		if ($line)
-			return $line[$param];
-		else
-			return null;
-
+		return $result->fetch_result($row, $param);
 	}
 
 	function close() {

classes/db/stmt.php

@@ -0,0 +1,32 @@
+<?php
+class Db_Stmt {
+	private $stmt;
+	private $cache;
+
+	function __construct($stmt) {
+		$this->stmt = $stmt;
+		$this->cache = false;
+	}
+
+	function fetch_result($row, $param) {
+		if (!$this->cache) {
+			$this->cache = $this->stmt->fetchAll();
+		}
+
+		if (isset($this->cache[$row])) {
+			return $this->cache[$row][$param];
+		} else {
+			user_error("Unable to jump to row $row", E_USER_WARNING);
+			return false;
+		}
+	}
+
+	function rowCount() {
+		return $this->stmt->rowCount();
+	}
+
+	function fetch() {
+		return $this->stmt->fetch();
+	}
+}
+?>