SQL Server：存储过程中的动态数据库名称

Question

我使用动态db名称创建存储过程。但我不能让我以后指定参数

@BatchStartTime = N'2013/12/26 15:00:00', 
@BatchEndTime = N'2013/12/26 15:30:00', 
@DBName = N'MYDATABASE' 

这里是我的示例代码运行它：

ALTER PROCEDURE [dbo].[newSpMurexTest] 
    @BatchStartTime AS VARCHAR(30), 
    @BatchEndTime AS VARCHAR(30), 
    @DBName AS VARCHAR(30) 
AS BEGIN 
     declare @vwAllTrans nvarchar(max) 

     set @vwAllTrans = N'select T.fin_payAmt, C.fin_midAmt, C.myr_equivalent from '+ QUOTENAME(@DBName) +'.dbo.tbl_transaction_history as H 
         inner join '+ QUOTENAME(@DBName) + '.dbo.tbl_transaction_cancellation as C on H.transaction_id = C.trans_id 
         inner join '+ QUOTENAME(@DBName) +'.dbo.tbl_transaction as T on H.transaction_id = T.transaction_id 
         where H.dt_last_chg >= @BatchStartTime H.dt_last_chg <= @BatchEndTime and (H.new_status IN (7))' 

    EXECUTE sp_executesql @vwAllTrans 
          ,'@BatchStartTime AS VARCHAR(30), @BatchEndTime AS VARCHAR(30)' 
          , @BatchStartTime, @BatchEndTime 
END 

如果删除@vwAllTrans我可以运行查询，直接选中它并更换@dbname,@BatchStartTime和@BatchEndTime ..我搞砸了它的查询时，它把它放在@vwAllTrans和exec呢？

Answer 1

ALTER PROCEDURE [dbo].[newSpMurexTest] 
@BatchStartTime AS NVARCHAR(30), 
@BatchEndTime AS NVARCHAR(30), 
@DBName   AS NVARCHAR(30) 

AS 
BEGIN 
    SET NOCOUNT ON; 

declare @vwAllTrans nvarchar(max) 
set @vwAllTrans = N'select T.fin_payAmt, C.fin_midAmt, C.myr_equivalent from '+ QUOTENAME(@DBName) + N'.dbo.tbl_transaction_history as H 
        inner join '+ QUOTENAME(@DBName) + N'.dbo.tbl_transaction_cancellation as C on H.transaction_id = C.trans_id 
        inner join '+ QUOTENAME(@DBName) + N'.dbo.tbl_transaction as T on H.transaction_id = T.transaction_id 
        where H.dt_last_chg >= @BatchStartTime AND H.dt_last_chg <= @BatchEndTime and H.new_status IN (7)' 

EXECUTE sp_executesql @vwAllTrans 
         ,N'@BatchStartTime AS NVARCHAR(30), @BatchEndTime AS NVARCHAR(30)' 
         , @BatchStartTime, @BatchEndTime 
END 

GO