function DatabaseConnection_mysql::nextIdDelete

File

includes/database/mysql/database.inc, line 506

Class

DatabaseConnection_mysql

Code

public function nextIdDelete() {
    // While we want to clean up the table to keep it up from occupying too
    // much storage and memory, we must keep the highest value in the table
    // because InnoDB  uses an in-memory auto-increment counter as long as the
    // server runs. When the server is stopped and restarted, InnoDB
    // reinitializes the counter for each table for the first INSERT to the
    // table based solely on values from the table so deleting all values would
    // be a problem in this case. Also, TRUNCATE resets the auto increment
    // counter.
    try {
        $max_id = $this->query('SELECT MAX(value) FROM {sequences}')
            ->fetchField();
        // We know we are using MySQL here, no need for the slower db_delete().
        $this->query('DELETE FROM {sequences} WHERE value < :value', array(
            ':value' => $max_id,
        ));
    } catch (PDOException $e) {
    }
}