mysql 触发器 trigger用法 one （简单的）

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DROP TABLE IF EXISTS tab1;

CREATE TABLE tab1(

    tab1_id varchar(11)

);

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DROP TABLE IF EXISTS tab2;

CREATE TABLE tab2(

    tab2_id varchar(11)

);

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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;

INSERT INTO tab1(tab1_id) values(‘0001‘);

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SELECT * FROM tab1;

SELECT * FROM tab2;

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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;

DELETE FROM tab1 WHERE tab1_id=‘0001‘;