Microsoft KB Archive/249012

Knowledge Base

PRB: Shaped Recordset Returns Incorrect Number of Records

Article ID: 249012

Article Last Modified on 5/8/2003

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APPLIES TO

• Microsoft ActiveX Data Objects 2.1
• Microsoft ActiveX Data Objects 2.1 Service Pack 1
• Microsoft ActiveX Data Objects 2.1 Service Pack 2
• Microsoft ActiveX Data Objects 2.5
• Microsoft ActiveX Data Objects 2.6
• Microsoft ActiveX Data Objects 2.7
• Microsoft Data Access Components 2.1
• Microsoft Data Access Components 2.1 Service Pack 2
• Microsoft Data Access Components 2.1 Service Pack 1
• Microsoft Data Access Components 2.1 Service Pack 2
• Microsoft Data Access Components 2.5
• Microsoft Data Access Components 2.6
• Microsoft Data Access Components 2.7

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This article was previously published under Q249012

SYMPTOMS

When you open two recordsets with the Msdatashape provider, the second recordset has the incorrect number of records.

CAUSE

You may be inadvertently re-shaping the data in the first recordset.

RESOLUTION

Change the second SHAPE statement to be within curly brackets { }.

STATUS

This behavior is by design.

MORE INFORMATION

The Msdatashape provider, that ships with Microsoft Data Access Components 2.1 and later, allows the results of a previous Shape statement to be re-shaped. This is often useful when you want to see all the child records at once without having to access them through the parent records.

To re-shape a recordset, specify the Alias name in the new statement without using curly brackets.

Steps to Reproduce Behavior

1. Using Visual Basic 5.0 or 6.0, create a new Standard EXE project.
2. Use the Project and References menu to 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 default form:

   Option Explicit
   
   Private Sub Command1_Click()
   Dim cn As ADODB.Connection, rs As ADODB.Recordset, rs2 As ADODB.Recordset
     Set cn = New ADODB.Connection
     cn.Open "Provider=MSDATASHAPE;Data Provider=Microsoft.Jet.OLEDB.4.0;Data Source=NWIND.MDB"
     Set rs = New ADODB.Recordset
     rs.CursorLocation = adUseClient
     rs.Open "SHAPE {SELECT * FROM Employees WHERE EmployeeID < 5} AS Employees " & _
             "APPEND ({SELECT * FROM Orders} RELATE EmployeeID TO EmployeeID)", _
             cn, adOpenStatic, adLockReadOnly, adCmdText
     Print_Records rs
     Set rs2 = New ADODB.Recordset
     rs2.Open "SHAPE Employees", cn, adOpenStatic, adLockReadOnly, adCmdText
     Print_Records rs2
     rs.Close
     rs2.Close
   End Sub
   
   Private Sub Print_Records(rs As ADODB.Recordset)
     Debug.Print "Recordset has "; rs.RecordCount; " records."
     rs.MoveFirst
     Do While Not rs.EOF
       Debug.Print rs(0), rs(1), rs(2)
       rs.MoveNext
     Loop
   End Sub
                           

   NOTE: You may have to change the Connect string to correctly point to the Nwind.mdb file.

4. Run the application and click Command. You see the following results:

   Recordset has  4  records.
    1            Davolio       Nancy
    2            Fuller        Andrew
    3            Leverling     Janet
    4            Peacock       Margaret
   Recordset has  4  records.
    1            Davolio       Nancy
    2            Fuller        Andrew
    3            Leverling     Janet
    4            Peacock       Margaret
                       

5. In order to return all of the employees to the second recordset, change the second Shape statement to:

     rs2.Open "SHAPE {SELECT * FROM Employees}", cn, adOpenStatic, adLockReadOnly, adCmdText
                       

6. Re-run the application. The following output is produced:

   Recordset has  4  records.
    1            Davolio       Nancy
    2            Fuller        Andrew
    3            Leverling     Janet
    4            Peacock       Margaret
   Recordset has  9  records.
    1            Davolio       Nancy
    2            Fuller        Andrew
    3            Leverling     Janet
    4            Peacock       Margaret
    5            Buchanan      Steven
    6            Suyama        Michael
    7            King          Robert
    8            Callahan      Laura
    9            Dodsworth     Anne
                       

Keywords: kbdatabase kbprb KB249012

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