运行一段SQL语句并返回值

我们经常要拼SQL语句，往往又想将拼成的SQL语句返回值到语句外面用。这时候，就需要用到SQL Server中自带的SP_EXECUTESQL了：

---If Over Bill Case----------------------------------------------------------------------------------------------------------

declare @strInVoicetable nvarchar(1000),@strOrdertable nvarchar(1000),@Inv_NO nvarchar(1000)

set @Inv_NO = '9010002999'

set @strInVoicetable = 'fi_invoice_detail_2008'

set @strOrdertable = 'order_detail_2008'

DECLARE @OverSql NVARCHAR(4000),@OverParameter NVARCHAR(1000)

declare @IsOverBill int

Select @OverSql = '

select @iIsOverBill =

case when (Convert(numeric(19,2),det.Med_Cost * fim.inv_exch) > Convert(numeric(19,2),(odet.UnitCost + odet.ProductionCost)))

or (Convert(numeric(19,2),det.AC1 * fim.inv_exch) > Convert(numeric(19,2),odet.AC1Amount))

then 1

else

case when @iIsOverBill = 1 then 1 else 0 end

end

from fi_invoice_master fim

left join ' + @strInVoicetable + ' det on fim.invoice_master_id = det.invoice_master_id

left join order_master ma on det.OrderNo=ma.OrderNo and det.OrderVersion=ma.OrderVersion

left join ' + @strOrdertable + ' odet on det.spotcode=odet.spotcode and det.order_detail_id = odet.order_detail_id

where fim.inv_no in(' + @Inv_NO + ')

',

@OverParameter = N'@iIsOverBill int OUTPUT'

EXEC SP_EXECUTESQL @OverSql,@OverParameter,@IsOverBill OUTPUT

select @IsOverBill

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我是数据库笨笨。