如何在MS Access中查找ADO查询的结果

debugcn 发表于 Dev

去那里

MS Access 2019 SQL Server 2017年

VBA代码中是否有任何直接，简单的方法来确定此查询是导致提交还是回滚。

这不是不可解决的，但我正在寻找一种不太复杂的方法。

在MS Access模块中：

  Dim SQLDB As Object
  Dim ADOcom As Object
  Dim sql As String

  sql = _
    "BEGIN TRY " & _
    "  BEGIN TRAN " & _
    "    UPDATE MyTable SET MyColumn=100 WHERE AnotherColumn=5 " & _
    "  COMMIT TRAN " & _
    "END TRY " & _
    "" & _
    "BEGIN CATCH " & _
    "  ROLLBACK TRAN " & _
    "END CATCH"
  
  Set SQLDB = CreateObject("ADODB.Connection")
  Set ADOcom = CreateObject("ADODB.Command")
  SQLDB.Open "Driver={SQL Server Native Client 11.0};Server=SQL;Database=MyDatabase;Trusted_Connection=yes;"
  SQLDB.CursorLocation = adUseClient
  Set ADOcom.activeconnection = SQLDB
  With ADOcom
    .CommandText = sql
    .Execute sql

' Code to find out if the .execute resulted in Commit

  End With
  Set ADOcom = Nothing
  SQLDB.Close
End Sub

完成：在此示例中，两个查询从任意MS Access Module发送到任意SQL Server。第一个查询返回期望值，但第二个查询不返回。这两个查询在SSMS中都可以正常工作。第二个查询出了什么问题？

Sub Example()
  Dim SQLDB As Object
  Dim query_1 As String, query_2 As String
  Dim rs As Object
  
  Set SQLDB = CreateObject("ADODB.Connection")
  SQLDB.Open "Driver={SQL Server Native Client 11.0};Server=MySQLserver;Database=MyDatabase;Trusted_Connection=yes;"
  Set rs = CreateObject("ADODB.Recordset")
  Set rs.activeconnection = SQLDB
  
  query_1 = _
    "SELECT 1"
  
  rs.Open query_1
  Debug.Print rs(0) ' Expected 1, got 1.
  rs.Close
  
  query_2 = _
    "DECLARE @Success INT " & _
    "BEGIN TRY " & _
    "  BEGIN TRAN " & _
    "    SELECT 1/0 " & _
    "    SET @Success=1 " & _
    "  COMMIT TRAN " & _
    "END TRY" & _
    " " & _
    "BEGIN CATCH " & _
    "  ROLLBACK TRAN " & _
    "  SET @Success=0 " & _
    "END CATCH " & _
    "SELECT @Success AS [Success]"

  rs.Open query_2
  Debug.Print rs(0) ' Expected 0 but rs is Nothing and got Error 3265
  rs.Close
  
  SQLDB.Close
End Sub

Gotqn

您可以返回一个status值或@variable。例如，

  sql = _
    "BEGIN TRY " & _
    "  BEGIN TRAN " & _
    "    UPDATE MyTable SET MyColumn=100 WHERE AnotherColumn=5 " & _
    "    SELECT 0 AS [ErrorStatus] " & _
    "  COMMIT TRAN " & _
    "END TRY " & _
    "" & _
    "BEGIN CATCH " & _
    "  ROLLBACK TRAN " & _
    "  SELECT 1 AS [ErrorStatus] " & _
    "END CATCH"

您可以在以下代码中使用此结果。在中，CATCH您可以使用THROW来获取原始错误并仍然使事务回滚：

BEGIN CATCH
      ROLLBACK TRAN;
      THROW;
END CATCH

这意味着您需要在vb.code本身中进行try / catch。如果您需要错误详细信息的另一种方法是使用以下功能（在SSMS中执行此功能）：

BEGIN TRY  
    -- Generate a divide-by-zero error.  
    SELECT 1/0;  
END TRY  
BEGIN CATCH  
    SELECT  
        ERROR_NUMBER() AS ErrorNumber  
        ,ERROR_SEVERITY() AS ErrorSeverity  
        ,ERROR_STATE() AS ErrorState  
        ,ERROR_PROCEDURE() AS ErrorProcedure  
        ,ERROR_LINE() AS ErrorLine  
        ,ERROR_MESSAGE() AS ErrorMessage;  
END CATCH;  
GO

他们正在返回错误的详细信息。您可以将它们返回或将它们分配给变量，并在以后进行处理。

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