mysql - 自动更新另一个表中的事件
我有两张表,一张用于存储用户的报告,另一张用于存储用户.
I have two tables, one for storing reports of a user, and another for storing users.
1. Report_table
-----report_id(P)-----user_id--------
001 user1
002 user1
003 user3
2.Users table
-------user_id(P)-------no_of_reports
user1 2
user2 0
user3 1
现在,每当在 report_table 中插入报告时(比如 report_id:004,user_id:user1),我都会像这样更新两个表.
Now whenever a report is inserted in report_table(say report_id:004, user_id: user1), I update both tables like this.
INSERT INTO reports_table VALUES (004,`user1`)
INSERT INTO users_table (user_id,no_of_reports) VALUES (`user1`,1)
ON DUPLICATE KEY UPDATE no_of_reports=no_of_reports+1;
有没有更好的方法来做到这一点..有没有办法在插入新报告时自动递增 no_of_reports 计数器?
Is there a better way of doing this.. Is there a way of automatically incrementing the no_of_reports counter when a new report is inserted?
推荐答案
你可以使用AFTER INSERT
触发器来处理TRIGGER
You can deal with TRIGGER
by using a AFTER INSERT
trigger
http://dev.mysql.com/doc/refman/5.0/en/triggers.html
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