if object_id('tb') is not null
drop table tb
go
create table tb(id int)
insert into tb select 1
insert into tb select 2
insert into tb select 3
insert into tb select 4if object_id('proc1')is not null
drop proc proc1
if object_id('proc2')is not null
drop proc proc2
gocreate proc proc1
@id varchar(50),
@count int output
as
begin
declare @sql nvarchar(4000)
set @sql='select @count=count(1) from tb where id>'+ltrim(@id)
exec sp_executesql @sql,N'@count int output',@count output
end
go
create proc proc2
as
begin
declare @count int,@id int
set @id=2
exec proc1 @id ,@count output
select 'proc1的结果共:'+ltrim(@count)+'条记录'
end
goexec proc2proc1的结果共:2条记录
drop table tb
go
create table tb(id int)
insert into tb select 1
insert into tb select 2
insert into tb select 3
insert into tb select 4if object_id('proc1')is not null
drop proc proc1
if object_id('proc2')is not null
drop proc proc2
gocreate proc proc1
@id varchar(50),
@count int output
as
begin
declare @sql nvarchar(4000)
set @sql='select @count=count(1) from tb where id>'+ltrim(@id)
exec sp_executesql @sql,N'@count int output',@count output
end
go
create proc proc2
as
begin
declare @count int,@id int
set @id=2
exec proc1 @id ,@count output
select 'proc1的结果共:'+ltrim(@count)+'条记录'
end
goexec proc2proc1的结果共:2条记录
/******************************************************************************************************************************************************
动态语句语法:exec\sp_executesql语法整理人:中国风(Roy)日期:2008.06.06
******************************************************************************************************************************************************/
动态语句语法:--方法1查询表改为动态
select * from sysobjects
exec('select ID,Name from sysobjects')
exec sp_executesql N'select ID,Name from sysobjects'--多了一个N为unicode--方法2:字段名,表名,数据库名之类作为变量时,用动态SQL
declare @FName varchar(20)
set @FName='ID'
exec('select '+@FName+' from sysobjects where '+@FName+'=5' )
declare @s varchar(1000)
set @s=N'select '+@FName+' from sysobjects where '+@FName+'=5'
exec sp_executesql @s--会报错
declare @s nvarchar(1000)--改为nvarchar
set @s=N'select '+@FName+' from sysobjects where '+@FName+'=5'
exec sp_executesql @s--成功
--方法3:输入参数declare @i int,@s nvarchar(1000)
set @i=5
exec('select ID,Name from sysobjects where ID='+@i)set @s='select ID,Name from sysobjects where ID=@i'
exec sp_executesql @s,N'@i int',@i--此处输入参数要加上N--方法4:输出参数declare @i int,@s nvarchar(1000)
set @s='select @i=count(1) from sysobjects'--用exec
exec('declare @i int '+@s+' select @i')--把整个语句用字符串加起来执行--用sp_executesql
exec sp_executesql @s,N'@i int output',@i output--此处输出参数要加上N
select @i
--方法5:输入输出--用sp_executesql
declare @i int,@con int,@s nvarchar(1000)
set @i=5
select @s='select @con=count(1) from sysobjects where ID>@i'
exec sp_executesql @s,N'@con int output,@i int',@con output ,@i
select @con--用exec
declare @i int,@s nvarchar(1000)
set @i=5
select @s='declare @con int select @con=count(1) from sysobjects where ID>'+rtrim(@i)+' select @con'
exec(@s)