Yii2中怎么判断MySQL库中是否存在某张表？

if(Yii::$app->db->createCommand("SHOW TABLES LIKE '".SearchModel::$table_name. '_tmp'."'")->queryAll() == null) {

            Yii::$app->db->createCommand()->truncateTable(Init::$table_name)->execute();

            Yii::$app->db->createCommand("CREATE TABLE IF NOT EXISTS ".SearchModel::$table_name. "_tmp LIKE ".SearchModel::$table_name)->execute();



        }