SQL系列学习 存储过程&事物语法

Posted 2020-10-11

/*学习事物基本语法*/

/*增加课室名的唯一索引*/
ALTER table class add constraint uni_ClassName unique(name)

/*创建存储过程，其中增加教师，并增加课室*/
CREATE proc pro_AddClass
@className varchar(50),
@teacherName varchar(50)
as
begin
declare @teacherid int
select @teacherid=id from teacher a where [email protected]

begin tran
IF(@teacherid=0 or @teacherid is null)
begin
insert into teacher(name) VALUES(@teachername)
select @teacherid=IDENT_CURRENT(‘teacher‘)
end

insert into class(teacherid,name) VALUES(@teacherid,@classname)

IF @@error<>0
begin
rollback tran
end
else
commit tran
end

/*执行存储过程，查看结果*/
exec pro_AddClass ‘Soft‘,‘Teacher Li‘

exec pro_AddClass ‘Math‘,‘Teacher Ann‘

 

 

主要还是记录自己学习的过程，这些基础的知识相信园内已经有很多分享，参考了各位的资料，再作为自学的记录而已，如有差错，请指正