PRB: ADO Command Incorrectly Returns Identity From Stored Proc

ID: Q218751


The information in this article applies to:
  • Microsoft Data Access Components versions 1.5, 2.0, 2.1


SYMPTOMS

When calling a stored procedure that excepts a TEXT type as an input argument and has an output argument that returns an identity field, if the TEXT argument is greater than 8000 characters then the output parameter does not return the identity correctly (instead it returns random values). This problem only occurs when using the MSDASQL OLE DB provider.


RESOLUTION

Currently, the only workaround to this problem is to use the SQLOLEDB provider.


STATUS

Microsoft is researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.


MORE INFORMATION

Steps to Reproduce Behavior

  1. Create a new Visual Basic Standard EXE project. Form1 is created by default. Place a CommandButton on the form1.


  2. Add a reference to the Microsoft ActiveX Data Objects Library.


  3. Place the following code behind the CommandButton's Click event:

    NOTE: You will need to change the connection string to connect to your SQL Server.


  4. 
        Dim cmd As ADODB.Command
        Dim cn As ADODB.Connection
        Dim cmdText As String
        Dim SQL As String
        
        'Get connection ... you will need to modify the connect string
        Set cn = CreateObject("ADODB.Connection")
        cn.Open "MSDASQL.1;Persist Security Info=False;Extended Properties=Driver={SQL Server};SERVER=YourServer;UID=sa;DATABASE=pubs"
        'cn.Open "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;Initial Catalog=pubs;Data Source=YourServer"
        
        'Create the Table and stored procedure for this test
        On Error Resume Next
        SQL = "create table QuickTest (" & _
                " c1 int identity, " & _
                " c2 TEXT  )"
        cn.Execute SQL
        
        SQL = " create proc QuickTest_proc @tvar TEXT, @iret int output " & _
                "as " & _
                "insert QuickTest values (@tvar) " & _
                "select @iret = @@identity "
        cn.Execute SQL
           
        On Error GoTo errhandler
        'Execute the stored procedure
        Set cmd = CreateObject("ADODB.Command")
        cmdText = "{?=call QuickTest_proc ( ?, ?) }"
        With cmd
            Set .ActiveConnection = cn
            .CommandType = adCmdText
            .CommandText = cmdText
            .Parameters.Refresh
            .Parameters(0).Direction = adParamReturnValue
            .Parameters(1).Direction = adParamInput
            .Parameters(1).Value = String(8001, "x") '<<this fails w/ MSDASQL provider
            '.Parameters(1).Value = String(8000, "x") '<<this works w/ both providers
            .Parameters(2).Direction = adParamOutput
            .Execute
        End With
        Debug.Print "Cmd.Parameters(2).Value: " & cmd.Parameters(2).Value
        Exit Sub
    
    errhandler:
        Debug.Print "Error: "; Err.Number & " -- " & Err.Description
     
  5. Run the code. Note that the identity value is not returned correctly if the input parameter is greater than 8000 characters and you are using the MSDASQL provider. If you change to the SQLOLEDB provider, everything works as expected.




© Microsoft Corporation 1999, All Rights Reserved.
Contributions by Mike Ruthruff, Microsoft Corporation

Additional query words:

Keywords : kbADO150bug kbADO200bug kbADO201bug kbStoredProc kbGrpVBDB
Version : WINDOWS:1.5,2.0,2.1
Platform : WINDOWS
Issue type : kbprb


Last Reviewed: May 3, 1999
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