存储过程

--无参数无返回值
create proc pl
as
begin
select*from Student
end
exec pl
drop proc pl

--有参数无返回值
create proc p2
@banj_id char(10), @Ssex char(2)
as
begin
select*from Student where Class=@banj_id and Ssex=@Ssex 
end
drop proc p2
exec p2 95031,男

--默认参数无返回值
create proc p3
@Ssex char(2)=男
as
select*from Student where Ssex like @Ssex+‘%‘
exec p3 

--有返回值无参数
create proc p4
@Sno char(10) output
as 
begin
select @Sno=Sname from Student where Sno=105
end
declare @rt char(10)
exec p4 @rt output
print @rt

--有返回值有参数
create proc p5
@a int,@b int,
@c int output
as
begin
set @c=@a+@b
end
declare @rt int
exec p5 1,2,@rt output
print @rt

--返回值return写法，只能返回单个数据值
alter proc p5
@a int,@b int
as
begin
return @a+@b
end
declare @rt int
exec @rt=p5 1,2
print @rt

--动态查询
--解析执行语句
exec(‘select*form Student‘)

create proc p6
@tablename varchar(15)
as
begin
exec(‘select*from ‘+@tablename)
end
drop proc p6
exec p6 ‘Student‘

create proc p7
@tablename char(10),@column char(10),@value char(10)
as
declare @query varchar(255)
select @query=‘select*from ‘+@tablename+‘ where ‘+@colum=@value
exec (@query)
exec p7 student,class,95033

--标量函数返回唯一数据值
create function f1 ()
returns int
as
begin
return 1
end
select dbo.f1()

create function f2
(@a int ,@b int)
returns int
as 
begin
return @a+@b
end
declare @rt int
select @rt=dbo.f2(1,2)
print @rt

--内嵌表值函数
create function f3
()
returns table
as
return(select *from student) 
select*from dbo.f3()
--多语句表值函数
alter function f4
()
returns @t table
(sno int,sname varchar(20))
as
begin
insert into @t select top 2 sno,sname from student
return
end
select*from dbo.f4()