declare @s nvarchar(4000)
set @s=exec('select @value='+ @fieldname+' from biaozhun where wd= 30')
exec sp_executesql @s,N'@value varchar(10) out',@value out
set @s=exec('select @value='+ @fieldname+' from biaozhun where wd= 30')
exec sp_executesql @s,N'@value varchar(10) out',@value out
select @filename
declare @value
'select @value=' + @field + from biaozhun where wd= 30