昨日发帖,给了如下存储过程,能用。
CREATE PROCEDURE vo_zhcx
@zd varchar(10)
AS
EXEC('select * from volvo where '+@zd+'=''小修''' )
GO
现在要解决:
1、字段值也要用变量替代:EXEC('select * from volvo where '+@zd+'=@nr' )
2、查询要用两个条件:where '+@zd+'=@nr and '+@zd1+'=@nr1
CREATE PROCEDURE vo_zhcx
@zd varchar(10)
AS
EXEC('select * from volvo where '+@zd+'=''小修''' )
GO
现在要解决:
1、字段值也要用变量替代:EXEC('select * from volvo where '+@zd+'=@nr' )
2、查询要用两个条件:where '+@zd+'=@nr and '+@zd1+'=@nr1
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 --动态sql语句基本语法
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
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
endEXEC(@sql) ==================
@conditon
是,把你要查的条件在外面 拼好!
如:
@conditon = " zd=nr and zd =nr1 ";
@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
语法检查后出现:
错误156 在关键字'print'附近有语法错误
@zd varchar(10) ,@zd1 varchar(10) ,@nr varchar(10) ,@nr1 varchar(10)
AS
EXEC('select * from volvo where '+@zd+' ='''+@nr+''' and '+@zd1+' ='''+@nr1+'''')
GO
调用
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出现如下错误
服务器: 消息 207,级别 16,状态 3,行 1
列名 '保养' 无效。
服务器: 消息 207,级别 16,状态 1,行 1
列名 '二分公司' 无效。
set @nr1='二分公司'
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