SQL 判断表是否存在 数据表不存在是致命错误

        // 判断表是否存在
        $db_info = explode ( '.', $table );
        $db_name = $db_info [0];
        $t_name = $db_info [1];
        $t_sql = "SHOW TABLES from $db_name LIKE '{$t_name}'";
        $re = $this->mysql->getAll ( $t_sql );