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<?php
// $Id$
/**
* @file
* Database interface code for MySQL database servers.
*/
/**
* @ingroup database
* @{
*/
class DatabaseConnection_mysql extends DatabaseConnection {
public function __construct(array $connection_options = array()) {
// This driver defaults to non transaction support.
$this->transactionSupport = !empty($connection_option['transactions']);
// MySQL never supports transactional DDL.
$this->transactionalDDLSupport = FALSE;
// Default to TCP connection on port 3306.
if (empty($connection_options['port'])) {
$connection_options['port'] = 3306;
}
$dsn = 'mysql:host=' . $connection_options['host'] . ';port=' . $connection_options['port'] . ';dbname=' . $connection_options['database'];
parent::__construct($dsn, $connection_options['username'], $connection_options['password'], array(
// So we don't have to mess around with cursors and unbuffered queries by default.
PDO::MYSQL_ATTR_USE_BUFFERED_QUERY => TRUE,
// Because MySQL's prepared statements skip the query cache, because it's dumb.
PDO::ATTR_EMULATE_PREPARES => TRUE,
// Force column names to lower case.
PDO::ATTR_CASE => PDO::CASE_LOWER,
));
// Force MySQL to use the UTF-8 character set by default.
$this->exec('SET NAMES "utf8"');
// Force MySQL's behavior to conform more closely to SQL standards.
// This allows Drupal to run almost seamlessly on many different
// kinds of database systems. These settings force MySQL to behave
// the same as postgresql, or sqlite in regards to syntax interpretation
// and invalid data handling. See http://drupal.org/node/344575 for further disscussion.
$this->exec("SET sql_mode='ANSI,TRADITIONAL'");
}
public function queryRange($query, array $args, $from, $count, array $options = array()) {
return $this->query($query . ' LIMIT ' . $from . ', ' . $count, $args, $options);
}
public function queryTemporary($query, array $args, array $options = array()) {
$tablename = $this->generateTemporaryTableName();
$this->query(preg_replace('/^SELECT/i', 'CREATE TEMPORARY TABLE {' . $tablename . '} Engine=MEMORY SELECT', $query), $args, $options);
return $tablename;
}
public function driver() {
return 'mysql';
}
public function databaseType() {
return 'mysql';
}
public function mapConditionOperator($operator) {
// We don't want to override any of the defaults.
return NULL;
}
/**
* @todo Remove this as soon as db_rewrite_sql() has been exterminated.
*/
public function distinctField($table, $field, $query) {
$field_to_select = 'DISTINCT(' . $table . '.' . $field . ')';
// (?<!text) is a negative look-behind (no need to rewrite queries that already use DISTINCT).
return preg_replace('/(SELECT.*)(?:' . $table . '\.|\s)(?<!DISTINCT\()(?<!DISTINCT\(' . $table . '\.)' . $field . '(.*FROM )/AUsi', '\1 ' . $field_to_select . '\2', $query);
}
}
/**
* @} End of "ingroup database".
*/
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