1.建立表時新增on delete cascade,on update cascade
create table goods
(gid int primary key,
gname varchar(10),
gprice money
)insert into goods values(101,'nokia',1200)
insert into goods values(102,'montorl',1200)
insert into goods values(103,'philips',1200)
create table provider
(pid int primary key,
pname varchar(10),
tel varchar(10)
)create table gp
(wno int primary key,
gid int references goods(gid) on delete cascade on update cascade,
pid int references provider(pid) on delete cascade on update cascade,
ldate datetime default getdate()
)insert into provider values(1001,'nokia','88223311')
insert into provider values(1002,'philips','11223344')
insert into provider values(1003,'philips','11223344')
insert into gp values(2,101,1001,getdate())
insert into gp values(1,101,1002,getdate())
select * from gp
select * from goods
select * from provider
delete from provider where pid=1001
update goods set gid=100 where gid=101
2.儲存過程實現級聯刪除和更新
create table goods
(gid int primary key,
gname varchar(10),
gprice money
)create table provider
(pid int primary key,
pname varchar(10),
tel varchar(10)
)create table gp
(wno int primary key,
gid int references goods(gid),
pid int references provider(pid),
ldate datetime default getdate()
)select * from goods
select * from provider
select * from gp
insert into goods values(101,'nokia',1200)
insert into goods values(102,'montorl',1200)
insert into goods values(103,'philips',1200)
insert into provider values(1001,'nokia','88223311')
insert into provider values(1002,'philips','11223344')
insert into provider values(1003,'philips','11223344')
insert into gp values(2,101,1001,getdate())
insert into gp values(1,101,1002,getdate())
--級聯刪除
create proc del
@gno int,
@pno int
asdelete from gp where gid=@gno or pid=@pno
delete from goods where gid=@gno
delete from provider where pid=@pno
exec del 101,0
--級聯更新
create table goods
(gid int constraint pk_gid primary key,
gname varchar(10)
)create table gp
(wno int primary key,
gno int constraint fk_gid foreign key references goods(gid),
price money
)insert into goods values(101,'nokia')
insert into goods values(102,'philips')
insert into goods values(103,'sansang')
insert into gp values(2,102,1200)
create proc updt
@gno int,
@gnew int
asalter table gp drop constraint fk_gid
update gp set gno=@gnew where gno=@gno
update goods set gid=@gnew where gid=@gno
alter table gp add constraint fk_gid foreign key(gno) references goods(gid)
exec updt 101,100
3.觸發器實現級聯刪除和更新
create table goods
(gid int constraint pk_gid primary key,
gname varchar(10)
)create table gp
(wno int primary key,
gno int constraint fk_gid foreign key references goods(gid),
price money
)insert into goods values(101,'nokia')
insert into goods values(102,'philips')
insert into goods values(103,'sansang')
insert into gp values(1,101,1200)
insert into gp values(2,102,1200)
create trigger deleteupdate
on goods
for inserted of delete
asdeclare @no int
select @no=gid from deleted
delete from gp where gno=@no
delete from goods where gno=@no
commit
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