oracle触发器使用案例

开发要求：

删除或者更新表tab的行时，更新表cust相应的字段。

表tab中custguid字段和表cust中cust_guid字段是关联字段,表tab中com字段和表cust中str字段是关联字段。

创建表tab，表cust

create table tab(custguid varchar2(30),com varchar2(20));
create table cust(cust_guid varchar2(30),str varchar2(20));

insert into tab values('1abc','help');
insert into tab values('qqqq','gggg');
insert into cust values('qqqq','ffff');
insert into cust values('2abc','help');
insert into cust values('3abc','help');
insert into cust values('4abc','help');

创建触发器

create or replace trigger tr_tab_cust_1
after
insert or update on tab
referencing new as new old as old
for each row
begin
update cust set str=:new.com where cust_guid=:new.cust_guid;
end;

验证

update TAB set COM = 'wwww' where CUSTGUID = '1abc';
select * from tab;
select * from cust;

发现，当更新tab的行时，表cust相应字段也跟着更新了。

备注：

1、关联字段的字符类型一定要相同

2、确保当前用户具有创建触发器的权限。触发器相关权限

grant create trigger to scott;
grant alter any trigger to scott;