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  • mysql触发器2

    更新

    mysql> create trigger t2
    -> after
    -> insert on ord
    -> for each row
    -> begin update goods set num=num-new.mch where gid = new.gid;
    -> end$
    Query OK, 0 rows affected (0.02 sec)

    mysql> 查看已有触发器trigger
    -> ^C
    mysql> show tigger;

    删除:

    mysql> create trigger t3 after delete on ord
    -> for each row begin update goods set num = num -old.mch where
    -> gid = old.gid;end $
    Query OK, 0 rows affected (0.02 sec)

    mysql> show triggers;
    -> $
    +---------+--------+-------+-------------------------------------------------------------------+--------+------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+----------------+----------------------+----------------------+--------------------+
    | Trigger | Event | Table | Statement | Timing | Created | sql_mode | Definer | character_set_client | collation_connection | Database Collation |
    +---------+--------+-------+-------------------------------------------------------------------+--------+------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+----------------+----------------------+----------------------+--------------------+
    | t2 | INSERT | ord | begin update goods set num=num-new.mch where gid = new.gid;
    end | AFTER | 2019-06-03 07:47:00.22 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | root@localhost | utf8 | utf8_general_ci | utf8_general_ci |
    | t3 | DELETE | ord | begin update goods set num = num -old.mch where
    gid = old.gid;end | AFTER | 2019-06-03 07:57:21.92 | ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,NO_ZERO_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION | root@localhost | utf8 | utf8_general_ci | utf8_general_ci |
    +---------+--------+-------+-------------------------------------------------------------------+--------+------------------------+-------------------------------------------------------------------------------------------------------------------------------------------+----------------+----------------------+----------------------+--------------------+
    2 rows in set (0.00 sec)

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  • 原文地址:https://www.cnblogs.com/ayanboke/p/10965579.html
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