public function tearDown()
{
if (isset($this->_conn)) {
$this->_conn->query('SET FOREIGN_KEY_CHECKS = 1;');
$this->_conn->rollback();
$this->_conn = null;
}
if (!self::$_setUp) {
throw new PHPUnit_Framework_Exception(get_class($this) . '::setUp() not called before start test.');
}
self::$_setUp = false;
}
