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if object_id('volvo')is not null drop table volvo
go
CREATE TABLE volvo(bxlx varchar(10), jcmc varchar(10))
INSERT volvo SELECT
'保养','二分公司' union all select
'a', 'v'
go
CREATE PROCEDURE vo_zhcx
@zd varchar(10) ,@zd1 varchar(10) ,@nr varchar(10) ,@nr1 varchar(10)
AS
EXEC('select * from volvo where '+@zd+' ='''+@nr+''' and '+@zd1+' ='''+@nr1+'''')
GO
declare @zd varchar(10),@zd1 varchar(10),@nr varchar(10),@nr1 varchar(10)
set @zd='bxlx'
set @zd1='jcmc'
set @nr='保养'
set @nr1='二分公司'
exec vo_zhcx @zd,@zd1,@nr,@nr1
bxlx jcmc
---------- ----------
保养 二分公司
(1 行受影响)
drop proc vo_zhcx
-- 应该是单引号
set @nr='保养'
set @nr1='二分公司'
CREATE PROCEDURE vo_zhcx
@zd varchar(10) ,@zd1 varchar(10) ,@nr varchar(10) ,@nr1 varchar(10)
AS
EXEC('select * from volvo where '+@zd+' ='''+@nr+''' and '+@zd1+' ='''+@nr1+'''')
GO
如:
@conditon = " zd=nr and zd =nr1 ";
CREATE PROCEDURE vo_zhcx
@conditon varchar(10)
AS
declare @sql varchar(5000)
set @sql ='select * from volvo where 1=1'
if(@conditon <>'')
begin
set @sql= @sql+ ' and '+@conditon
end
EXEC(@sql)
==================
@conditon
是,把你要查的条件在外面 拼好!
CREATE PROCEDURE vo_zhcx
@zd varchar(10) , @zd1 varchar(10) , @nr varchar(10) , @nr1 varchar(10)
AS
EXEC(print ('select * from volvo where ' + @zd + ' = ''' + @nr + '''' + ' and ' + @zd1 + ' = ''' + @nr1 + '''')
GO
1 :普通SQL语句可以用Exec执行
eg: Select * from tableName
Exec('select * from tableName')
Exec sp_executesql N'select * from tableName' -- 请注意字符串前一定要加N
2:字段名,表名,数据库名之类作为变量时,必须用动态SQL
eg:
declare @fname varchar(20)
set @fname = 'FiledName'
Select @fname from tableName -- 错误,不会提示错误,但结果为固定值FiledName,并非所要。
Exec('select ' + @fname + ' from tableName') -- 请注意 加号前后的 单引号的边上加空格
当然将字符串改成变量的形式也可
declare @fname varchar(20)
set @fname = 'FiledName' --设置字段名
declare @s varchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句会报错
declare @s Nvarchar(1000) -- 注意此处改为nvarchar(1000)
set @s = 'select ' + @fname + ' from tableName'
Exec(@s) -- 成功
exec sp_executesql @s -- 此句正确
3. 输出参数
declare @num int,
@sqls nvarchar(4000)
set @sqls='select count(*) from tableName'
exec(@sqls)
--如何将exec执行结果放入变量中?
declare @num int,
@sqls nvarchar(4000)
set @sqls='select @a=count(*) from tableName '
exec sp_executesql @sqls,N'@a int output',@num output
select @num