FIX: DBCS Characters Cause Duplicate Column Name When Using Jet 4 (257712)

SYMPTOMS

When you try to create a Microsoft Access 97 table from a Visual Basic project, you may receive the following error message:

-2147217900(80040e14):
[Microsoft][ODBC Microsoft Access Driver] Field '(The second column name)' already exists in table 'HWC'

The problem does not occur with a Microsoft Access 2000 database.

This problem arises when you attempt to create a table with two columns that contain double-byte character sets whose fields are the same length. This problem only occurs with the Jet 4.0 OLE-DB provider and the Access ODBC driver.

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article. This bug was corrected in the latest service pack for Visual Studio 6.0.

For additional information about Visual Studio service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base:

194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

194295 HOWTO: Tell That a Visual Studio Service Pack Is Installed

To download the latest Visual Studio service pack, visit the following Microsoft Web site:

http://msdn.microsoft.com/vstudio/downloads/updates/

In addition, the Jet 3.51 OLEDB provider does not exhibit this behavior.

MORE INFORMATION

Steps to Reproduce Behavior

Use Access 97 or the Visual Data Manager Add-In to create a blank .mdb file named Test in the Visual Basic 98 application folder.
In Visual Basic, create a new Standard EXE project. Form1 is created by default.
Add a CommandButton control to Form1. Command1 is created by default.

Paste the following code into Form1's Code window:

Private Sub Command1_Click()
    Dim cn As ADODB.Connection
    Set cn = New ADODB.Connection

    'Call cn.Open("Provider=Microsoft.Jet.OLEDB.3.51;Persist Security Info=False;" & _
        "Data Source=c:\program files\microsoft visual studio\vb98\Test.mdb")
    'Call cn.Open("Provider=Microsoft.Jet.OLEDB.4.0;Persist Security Info=False;" & _
        "Data Source=c:\program files\microsoft visual studio\vb98\Test.mdb")
    Call cn.Open("Driver={Microsoft Access Driver (*.mdb)};" & _
        "Dbq=c:\program files\microsoft visual studio\vb98\test.mdb")
        
    'The table has two columns, each column name has 4 DBCS characters.
    'Replace the question marks in the following line with DBCS characters
    cn.Execute "Create TABLE HWC(???? DateTime,???? String(5))"
    Call cn.Close
End Sub

Run the project, click the CommandButton, and note that the error message in the "Symptoms" section appears.