FIX: Problem Assigning ADO Recordset Numeric Fields to Another Field

Using MDAC 2.1 SP2 (build 2.1.2.4202.3) or earlier, when attempting to assign an ADO recordset field with Numeric data type to a second recordset field (for example, rs2!K2 = rs1!K1), the following error appears: This problem is observed when client side cursor is specified (adUseClient).

There are three ways to work around this problem:

1. Use Server-side cursor (adUseServer).
2. Assign field value to a variable, and then assign the variable to the field of the second recordset, such as:

   myVar = rs1!K1
   rs2!K2 = myVar
   					

3. Use the .Value property of the Column object, such as:

   rs2("K2").Value = rs1("K1").Value
   					

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 Microsoft Data Access Components version 2.5 or later. You can obtain the latest version of Microsoft Data Access Components form the following Microsoft Web site:

Steps to Reproduce Behavior

1. Start a new Standard EXE project in Visual Basic. Form1 is created by default. Make a reference to the Microsoft ActiveX Data Objects 2.1 Library.
2. Double-click Form1. Copy and paste the following code under the Form_Load() event:

       Dim cn As New ADODB.Connection
       Dim rs1 As New ADODB.Recordset
       Dim rs2 As New ADODB.Recordset
           
       With cn
         .ConnectionString = "Provider=MSDASQL;Driver={SQL Server};UID=xxx;PWD=xxx;Server=MyServer;Database=Pubs;"
          .CursorLocation = adUseClient
          .Open
       End With
       
       On Error Resume Next
       cn.Execute "Drop Table T1"
       cn.Execute "Drop Table T2"
       On Error GoTo 0
       
       cn.Execute "Create Table T1 (K1 Numeric Primary Key)"
       cn.Execute "Create Table T2 (K2 Numeric Primary Key)"
       cn.Execute "Insert Into T1 Values (1)"
       cn.Execute "Insert Into T2 Values (1)"
       
       rs1.Open "SELECT * FROM T1", cn, adOpenKeyset, adLockOptimistic
       rs2.Open "SELECT * FROM T2", cn, adOpenKeyset, adLockOptimistic
   
       rs2!K2 = rs1!K1
       rs2.Update
       
       rs1.Close
       rs2.Close
       cn.Close
   					

For additional information about MDAC release history, click the article number below to view the article in the Microsoft Knowledge Base: