实例~~
example1:
创建表tab1
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DROP TABLE IF EXISTS tab1;
CREATE TABLE tab1(
tab1_id varchar(11)
); |
创建表tab2
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DROP TABLE IF EXISTS tab2;
CREATE TABLE tab2(
tab2_id varchar(11)
); |
创建触发器:t_afterinsert_on_tab1
作用：增加tab1表记录后自动将记录增加到tab2表中
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DROP TRIGGER IF EXISTS t_afterinsert_on_tab1;
CREATE TRIGGER t_afterinsert_on_tab1
AFTER INSERT ON tab1
FOR EACH ROW
BEGIN insert into tab2(tab2_id) values(new.tab1_id);
END;
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测试一下
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INSERT INTO tab1(tab1_id) values('0001');
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看看结果
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SELECT * FROM tab1;
SELECT * FROM tab2;
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example2:
创建触发器:t_afterdelete_on_tab1
作用：删除tab1表记录后自动将tab2表中对应的记录删去
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DROP TRIGGER IF EXISTS t_afterdelete_on_tab1;
CREATE TRIGGER t_afterdelete_on_tab1
AFTER DELETE ON tab1
FOR EACH ROW
BEGIN delete from tab2 where tab2_id=old.tab1_id;
END;
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测试一下
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DELETE FROM tab1 WHERE tab1_id='0001';
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