mysql> show fields from do; +-----------+------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +-----------+------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | parent_id | int(11) | YES | | 0 | | | data_time | bigint(20) | YES | | NULL | | | text | text | YES | | NULL | | +-----------+----------