有个参数是个串 比如 "1=1 and 1=1 and 1=1"
存储过程为:
CREATE PROCEDURE [dbo].[test] (@Conditions varchar(8000),@return varchar(40) output)AS
declare @str varchar(1000);
declare @a1 varchar(10),@a2 varchar(10)
set @str='select top 1 a1,a2 from xx表 where' + @Conditions
exec @str
//这里我获得了我需要的记录集合,并且只有一条记录,
//我需要提取a1 ,a2 的值 并不打算返回记录集合
//我设想是这样做但不成功
/*
declare sql_b CURSOR FOR exec @str
open sql_b
FETCH NEXT FROM sql_b
INTO @a1,@a2
//我想返回一个串
set @return=@a1+","+@a2
CLOSE sql_b
DEALLOCATE sql_b
*/
改怎么实现请大大帮忙~~~
存储过程为:
CREATE PROCEDURE [dbo].[test] (@Conditions varchar(8000),@return varchar(40) output)AS
declare @str varchar(1000);
declare @a1 varchar(10),@a2 varchar(10)
set @str='select top 1 a1,a2 from xx表 where' + @Conditions
exec @str
//这里我获得了我需要的记录集合,并且只有一条记录,
//我需要提取a1 ,a2 的值 并不打算返回记录集合
//我设想是这样做但不成功
/*
declare sql_b CURSOR FOR exec @str
open sql_b
FETCH NEXT FROM sql_b
INTO @a1,@a2
//我想返回一个串
set @return=@a1+","+@a2
CLOSE sql_b
DEALLOCATE sql_b
*/
改怎么实现请大大帮忙~~~
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
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
declare @str varchar(1000);
set @str='select @return=top 1 rtrim(a1)+'',''+rtrim(a2) from xx表 where' + @Conditions
exec sp_executesql @str,N'@return varchar(40) output',@return output