日期:2014-05-18 浏览次数:20416 次
--如何将exec执行结果放入变量中? declare @num int, @sql nvarchar(4000) set @sql= 'select @a=count(*) from tableName ' exec sp_executesql @sql,N '@a int output ',@num output select @num
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create table tb(id int,name varchar(50)) insert into tb select 1,'a' insert into tb select 2,'b' insert into tb select 3,'b' declare @num1 int,@num2 int,@sql nvarchar(4000) set @sql= 'select @a=count(distinct id),@b=count(distinct name) from tb' exec sp_executesql @sql,N'@a int output,@b int output',@num1 output,@num2 output select @num1 as [不重复id],@num2 as [不重复name]
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参考——3.输出参数
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
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