Added Oracle database driver
Aleksander Machniak
10 years ago
parent
34a0902089
commit
b84a04336b
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<?php
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/**
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+-----------------------------------------------------------------------+
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2011-2014, Kolab Systems AG |
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| |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| |
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| PURPOSE: |
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| Database wrapper class that implements PHP PDO functions |
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| for Oracle database |
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+-----------------------------------------------------------------------+
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| Author: Aleksander Machniak <machniak@kolabsys.com> |
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+-----------------------------------------------------------------------+
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*/
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/**
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* Database independent query interface
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* This is a wrapper for the PHP PDO
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*
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* @package Framework
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* @subpackage Database
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*/
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class rcube_db_oracle extends rcube_db
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{
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public $db_provider = 'oracle';
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/**
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* Driver-specific configuration of database connection
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*
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* @param array $dsn DSN for DB connections
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* @param PDO $dbh Connection handler
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*/
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protected function conn_configure($dsn, $dbh)
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{
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$dbh->query("ALTER SESSION SET nls_date_format = 'YYYY-MM-DD'");
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$dbh->query("ALTER SESSION SET nls_timestamp_format = 'YYYY-MM-DD HH24:MI:SS'");
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}
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/**
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* Get last inserted record ID
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*
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* @param string $table Table name (to find the incremented sequence)
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*
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* @return mixed ID or false on failure
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*/
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public function insert_id($table = null)
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{
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if (!$this->db_connected || $this->db_mode == 'r' || empty($table)) {
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return false;
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}
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$sequence = $this->quote_identifier($this->sequence_name($table));
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$result = $dbh->query("SELECT $sequence.currval FROM dual");
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return $result ? $result->fetchColumn() : false;
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}
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/**
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* Formats input so it can be safely used in a query
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* PDO_OCI does not implement quote() method
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*
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* @param mixed $input Value to quote
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* @param string $type Type of data (integer, bool, ident)
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*
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* @return string Quoted/converted string for use in query
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*/
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public function quote($input, $type = null)
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{
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// handle int directly for better performance
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if ($type == 'integer' || $type == 'int') {
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return intval($input);
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}
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if (is_null($input)) {
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return 'NULL';
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}
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if ($type == 'ident') {
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return $this->quote_identifier($input);
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}
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switch ($type) {
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case 'bool':
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case 'integer':
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return intval($input);
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default:
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return "'" . strtr($input, array(
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'?' => '??',
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"'" => "''",
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rcube_db::DEFAULT_QUOTE => rcube_db::DEFAULT_QUOTE . rcube_db::DEFAULT_QUOTE
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)) . "'";
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}
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}
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/**
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* Return correct name for a specific database sequence
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*
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* @param string $table Table name
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*
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* @return string Translated sequence name
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*/
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protected function sequence_name($table)
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{
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// Note: we support only one sequence per table
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// Note: The sequence name must be <table_name>_seq
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$sequence = $table . '_seq';
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// modify sequence name if prefix is configured
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if ($prefix = $this->options['table_prefix']) {
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return $prefix . $sequence;
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}
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return $sequence;
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}
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/**
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* Return SQL statement for case insensitive LIKE
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*
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* @param string $column Field name
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* @param string $value Search value
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*
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* @return string SQL statement to use in query
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*/
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public function ilike($column, $value)
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{
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return 'UPPER(' . $this->quote_identifier($column) . ') LIKE UPPER(' . $this->quote($value) . ')';
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}
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/**
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* Return SQL function for current time and date
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*
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* @param int $interval Optional interval (in seconds) to add/subtract
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*
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* @return string SQL function to use in query
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*/
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public function now($interval = 0)
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{
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if ($interval) {
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$interval = intval($interval);
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return "current_timestamp + INTERVAL $interval SECOND";
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}
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return "current_timestamp";
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}
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/**
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* Return SQL statement to convert a field value into a unix timestamp
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*
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* @param string $field Field name
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*
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* @return string SQL statement to use in query
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* @deprecated
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*/
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public function unixtimestamp($field)
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{
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return "(($field - to_date('1970-01-01','YYYY-MM-DD')) * 60 * 60 * 24)";
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}
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/**
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* Adds TOP (LIMIT,OFFSET) clause to the query
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*
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* @param string $query SQL query
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* @param int $limit Number of rows
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* @param int $offset Offset
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*
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* @return string SQL query
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*/
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protected function set_limit($query, $limit = 0, $offset = 0)
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{
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$limit = intval($limit);
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$offset = intval($offset);
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$end = $offset + $limit;
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// @TODO: Oracle 12g has better OFFSET support
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$orderby = stristr($query, 'ORDER BY');
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$select = substr($query, 0, stripos($query, 'FROM'));
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$offset += 1;
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if ($orderby !== false) {
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$query = trim(substr($query, 0, -1 * strlen($orderby)));
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}
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else {
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// it shouldn't happen, paging without sorting has not much sense
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// @FIXME: I don't know how to build paging query without ORDER BY
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$orderby = "ORDER BY 1";
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}
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$query = preg_replace('/^SELECT\s/i', '', $query);
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$query = "$select FROM (SELECT ROW_NUMBER() OVER ($orderby) AS row_number, $query)"
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. " WHERE row_number BETWEEN $offset AND $end";
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return $query;
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}
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/**
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* Parse SQL file and fix table names according to table prefix
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*/
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protected function fix_table_names($sql)
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{
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if (!$this->options['table_prefix']) {
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return $sql;
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}
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$sql = parent::fix_table_names($sql);
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// replace sequence names, and other Oracle-specific commands
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$sql = preg_replace_callback('/((SEQUENCE ["]?)([^" \r\n]+)/',
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array($this, 'fix_table_names_callback'),
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$sql
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);
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$sql = preg_replace_callback(
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'/([ \r\n]+["]?)([^"\' \r\n\.]+)(["]?\.nextval)/',
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array($this, 'fix_table_names_seq_callback'),
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$sql
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);
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return $sql;
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}
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/**
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* Preg_replace callback for fix_table_names()
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*/
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protected function fix_table_names_seq_callback($matches)
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{
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return $matches[1] . $this->options['table_prefix'] . $matches[2] . $matches[3];
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}
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/**
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* Returns PDO DSN string from DSN array
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*/
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protected function dsn_string($dsn)
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{
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$params = array();
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$result = 'oci:';
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if ($dsn['hostspec']) {
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$host = $dsn['hostspec'];
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if ($dsn['port']) {
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$host .= ':' . $dsn['port'];
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}
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$dsn['database'] = $host . '/' . $dsn['database'];
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}
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if ($dsn['database']) {
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$params[] = 'dbname=' . $dsn['database'];
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}
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$params['charset'] = 'UTF8';
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if (!empty($params)) {
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$result .= implode(';', $params);
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}
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return $result;
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}
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}
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