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[MySQL learning notes 29] trigger
2022-07-06 07:19:00 【yqs_ two hundred and eighty-one million eight hundred and seven】
establish
CREATE TRIGGER trigger_name
BEFORE/AFTER INSERT/UPDATE/DELETE
ON tb_name FOR EACH ROW – Line level triggers
BEGIN
trigger_statement;
END;
see
SHOW TRIGGERS;
Delete
DROP TRIGGER [schema_name.]trigger_name; -- Is not specified schema_name The default is the current database
Case study
create trigger tb_user_insert_trigger after insert on tb_user for each row
begin
insert into tb_logs(id,operation,operate_time,operate_id,operate_params)
values(null,'insert',now(),new.id,concat(' The inserted data content is :',new.content));
end;
create trigger tb_user_insert_trigger after update on tb_user for each row
begin
insert into tb_logs(id,operation,operate_time,operate_id,operate_params)
values(null,'update',now(),new.id,concat(' Data before updating :',old.content));
end;
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