78 lines
2.6 KiB
PHP
78 lines
2.6 KiB
PHP
<?php
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// $Id$
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/**
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* @file
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* Database interface code for MySQL database servers.
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*/
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/**
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* @ingroup database
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* @{
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*/
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class DatabaseConnection_mysql extends DatabaseConnection {
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public function __construct(array $connection_options = array()) {
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// This driver defaults to non transaction support.
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$this->transactionSupport = !empty($connection_option['transactions']);
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// Default to TCP connection on port 3306.
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if (empty($connection_options['port'])) {
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$connection_options['port'] = 3306;
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}
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$dsn = 'mysql:host=' . $connection_options['host'] . ';port=' . $connection_options['port'] . ';dbname=' . $connection_options['database'];
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parent::__construct($dsn, $connection_options['username'], $connection_options['password'], array(
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// So we don't have to mess around with cursors and unbuffered queries by default.
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PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
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// Because MySQL's prepared statements skip the query cache, because it's dumb.
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PDO::ATTR_EMULATE_PREPARES => TRUE,
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// Force column names to lower case.
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PDO::ATTR_CASE => PDO::CASE_LOWER,
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));
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// Force MySQL to use the UTF-8 character set by default.
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$this->exec('SET NAMES "utf8"');
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// Enable MySQL's "strict mode", which removes most of MySQL's
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// "just be lazy" behaviors that end up causing more trouble than they're worth.
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$this->exec('SET sql_mode=STRICT_ALL_TABLES');
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}
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public function queryRange($query, array $args, $from, $count, array $options = array()) {
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return $this->query($query . ' LIMIT ' . $from . ', ' . $count, $args, $options);
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}
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public function queryTemporary($query, array $args, $tablename, array $options = array()) {
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return $this->query(preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE ' . $tablename . ' Engine=MEMORY SELECT', $query), $args, $options);
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}
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public function driver() {
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return 'mysql';
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}
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public function databaseType() {
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return 'mysql';
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}
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public function mapConditionOperator($operator) {
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// We don't want to override any of the defaults.
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return NULL;
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}
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/**
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* @todo Remove this as soon as db_rewrite_sql() has been exterminated.
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*/
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public function distinctField($table, $field, $query) {
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$field_to_select = 'DISTINCT(' . $table . '.' . $field . ')';
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// (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
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return preg_replace('/(SELECT.*)(?:' . $table . '\.|\s)(?<!DISTINCT\()(?<!DISTINCT\(' . $table . '\.)' . $field . '(.*FROM )/AUsi', '\1 ' . $field_to_select . '\2', $query);
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}
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}
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/**
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* @} End of "ingroup database".
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*/
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