function DatabaseSchema_mysql::fieldExists

Overrides DatabaseSchema::fieldExists

File

includes/database/mysql/schema.inc, line 528

Class

DatabaseSchema_mysql

Code

public function fieldExists($table, $column) {
    // The information_schema table is very slow to query under MySQL 5.0.
    // Instead, we try to select from the table and field in question. If it
    // fails, the most likely reason is that it does not exist. That is
    // dramatically faster than using information_schema.
    // @link http://bugs.mysql.com/bug.php?id=19588
    // @todo: This override should be removed once we require a version of MySQL
    // that has that bug fixed.
    try {
        $this->connection
            ->queryRange("SELECT {$column} FROM {" . $table . "}", 0, 1);
        return TRUE;
    } catch (Exception $e) {
        return FALSE;
    }
}