FIX: MDAC 2.1 SP1 Problem Executing Access Query with Wildcard

This article was previously published under Q245343
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In Access the asterisk(*) is the normal wildcard character. However, in Visual Basic with MDAC 2.1 SP1 (version installed, when calling an Access query using this wildcard character through ADO and the Access ODBC driver, it fails to return any records.
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.This bug is corrected in MDAC 2.1 SP2 ( (GA)), which can be downloaded from here:

Steps to Reproduce Behavior

Create the Access Query

In Access 97 or Access 2000, create a query, Query1, with the following SQL statement in the Nwind.mdb or NorthWind.mdb database:
Select * From Customers Where Customer ID LIKE 'A*'				
This should return all of the customer records (4 in all) with a Customer ID that starts with "A".

Visual Basic Test Application

  1. Start a new project in Visual Basic and choose Standard EXE. Form1 is created by default.
  2. Using the Project and References menu, add a reference to the following type library:
    Microsoft ActiveX Data Objects 2.1 Library
  3. Add a Command button (Command1) and the following code to the form:
    Option ExplicitPrivate Sub Command1_Click()Dim cn As ADODB.Connection, rs As ADODB.Recordset, cmd As ADODB.Command  Set cn = New ADODB.Connection  Set cmd = New ADODB.Command  Set rs = New ADODB.Recordset  cn.Open "Driver={Microsoft Access Driver (*.mdb)};" & _          "DBQ=C:\Program Files\Microsoft Visual Studio\VB98\nwind.mdb"  With cmd    .Name = "Query1"    .CommandText = "Query1"    .CommandType = adCmdStoredProc    Set .ActiveConnection = cn  End With  rs.CursorLocation = adUseClient  rs.Open cmd  Debug.Print rs.RecordCount  rs.Close  cn.CloseEnd Sub						
    You need to change the path to Nwind.mdb in the connect string to point to the database you modified.
  4. Run the application and click the Command button. On systems with older versions of MDAC 2.1, 0 is returned as the record count. With the later version of MDAC 2.1, the correct number, 4, is returned.
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Article ID: 245343 - Last Review: 02/28/2014 00:29:20 - Revision: 2.3

  • Microsoft ActiveX Data Objects 2.1 Service Pack 1
  • Microsoft ActiveX Data Objects 2.1 Service Pack 2
  • Microsoft Visual Basic 5.0 Enterprise Edition
  • Microsoft Visual Basic Enterprise Edition for Windows 6.0
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