Question

我正在为数据迁移编写存储过程。在那里，我需要将表及其整个数据从其他数据库复制到当前数据库的临时表。但是，数据库名称将作为参数。然后我需要处理复制的数据。但是，我不知道如何使用动态数据库名称。

CREATE PROCEDURE [dbo].[MGRT] 
   @DBName VARCHAR(50)
 AS
BEGIN
   SET NOCOUNT ON;
   IF OBJECT_ID('tempdb..#TMPCH') IS NOT NULL               
      DROP TABLE #TMPCH;            
   SELECT * INTO #TMPCH FROM MDDX.dbo.CH ORDER BY MDate,Mtime               

DECLARE @count INT = 0              
DECLARE @curRow INT = 0             
SELECT @count = COUNT(*) FROM #TMPCH                

WHILE @curRow <= @count             
    BEGIN           
        DECLARE @lastDate NVARCHAR(10) = '-'        
        SET @lastDate = (SELECT TOP 1 To_Date FROM CH ORDER BY SysKey DESC)     

        IF @lastDate = '' OR @lastDate IS NULL      
            BEGIN   
                SET @lastDate = '-'
                PRINT @lastDate
            END 

        INSERT INTO CH(syskey,CurCode,CurDesc,CurSymbol,CurRate,From_Date,To_Date,userid,username)      
            (SELECT @curRow,CurCode,CurDesc,CurSymbol,CURRATE,@lastDate,MDate,'admin','Administrator'   
             FROM (SELECT *,ROW_NUMBER() OVER(ORDER BY MDate,MTime) AS rowNo FROM #TMPCH) AS TMP WHERE rowNo = @curRow) 
        SET @curRow = @curRow + 1       
    END         
END

我需要使用@DBName而不是MDDX来获取数据。

谢谢！

Answer 1

您需要使用动态查询，如下所示;

CREATE PROCEDURE [dbo].[MGRT] 
   @DBName VARCHAR(50)
 AS
BEGIN
   SET NOCOUNT ON;
   DECLARE sSQL as varchar(200)

   IF OBJECT_ID('tempdb..#TMPCH') IS NOT NULL               
      DROP TABLE #TMPCH;            

  sSQL = 'SELECT * INTO #TMPCH FROM @DBName.dbo.CH ORDER BY MDate,Mtime'               
  Exec (sSQL)

DECLARE @count INT = 0              
DECLARE @curRow INT = 0             
SELECT @count = COUNT(*) FROM #TMPCH                

WHILE @curRow <= @count             
    BEGIN           
        DECLARE @lastDate NVARCHAR(10) = '-'        
        SET @lastDate = (SELECT TOP 1 To_Date FROM CH ORDER BY SysKey DESC)     

        IF @lastDate = '' OR @lastDate IS NULL      
            BEGIN   
                SET @lastDate = '-'
                PRINT @lastDate
            END 

        INSERT INTO CH(syskey,CurCode,CurDesc,CurSymbol,CurRate,From_Date,To_Date,userid,username)      
            (SELECT @curRow,CurCode,CurDesc,CurSymbol,CURRATE,@lastDate,MDate,'admin','Administrator'   
             FROM (SELECT *,ROW_NUMBER() OVER(ORDER BY MDate,MTime) AS rowNo FROM #TMPCH) AS TMP WHERE rowNo = @curRow) 
        SET @curRow = @curRow + 1       
    END         
END

使用Microsoft SQL Server中不同数据库中的数据复制表

1 个答案: