set @sql =N'select @totalCounts=count(*) from '+@tblnameexec sp_executesql @sql,N'@totalcounts int output',@totalcounts output ---输出set @pageCounts=(@totalCounts/@pageSize)exec sp_executesql N'@pageCounts int output',@pageCounts output ---输出select @totalcounts,@pageCounts
过程需要参数 '@parameters' 为 'ntext/nchar/nvarchar' 类型。@pageCounts(因为它是int类型?)这里有错.但是不知道怎样改,谢谢.
过程需要参数 '@parameters' 为 'ntext/nchar/nvarchar' 类型。@pageCounts(因为它是int类型?)这里有错.但是不知道怎样改,谢谢.
insert into tb select 1,'小磊'declare @JobEnd varchar(50) ,@id int,@sql nvarchar(4000)
set @id=1
set @sql='select @JobEnd=name from tb where id='+ltrim(@id)
exec sp_executesql @sql,N'@JobEnd varchar(50) output',@JobEnd output
print @JobEnd
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 @sql nvarchar(4000)
declare @tblname varchar(10)
set @tblname = 'authors'
declare @pageSize as int
set @pageSize = 2
declare @pageCounts as intset @sql = 'select @a = count(*) from ' + @tblname
exec sp_executesql @sql , N'@a int output' , @totalCounts output set @pageCounts=(@totalCounts/@pageSize)select @totalCounts,@pageCounts
/*
----------- -----------
23 11(所影响的行数为 1 行)
*/