FIX: MSHFLexGrid Does Not Display More Than 2048 Rows

• Microsoft Visual Basic Enterprise Edition for Windows, version 6.0

SYMPTOMS

The Hierarchical FlexGrid control always displays a maximum of 2048 rows regardless of the number of records in the data source.

RESOLUTION

Although the record-count of the mshflexgrid is correct, only the first 2048 records are displayed. If you need to display more than 2048, you need to open the recordset and populate the grid using the GetString method of ADO and the Clip property of the MSHFlexGrid.

The code below can be used in place of the code in the Command1_Click event in the MORE INFORMATION section to work around this behavior:

   Dim cn As New ADODB.Connection
   Dim rs As New ADODB.Recordset
   Dim rsVar As Variant
   Dim i As Integer
   cn.Open "Testing"  '<-- Your DSN

   rs.Open "select * from Cies", cn, adOpenStatic, adLockOptimistic
   rs.MoveLast

   rs.MoveFirst
   ' Assuming that rs is your ADO recordset
   MSHFlexGrid1.Rows = rs.RecordCount + 1

   rsVar = rs.GetString(adClipString, rs.RecordCount)

   MSHFlexGrid1.Cols = rs.Fields.Count

   ' Set column names in the grid
   For i = 0 To rs.Fields.Count - 1

       MSHFlexGrid1.TextMatrix(0, i) = rs.Fields(i).Name

   Next

   MSHFlexGrid1.Row = 1
   MSHFlexGrid1.Col = 0

   ' Set range of cells in the grid
   MSHFlexGrid1.RowSel = MSHFlexGrid1.Rows - 1
   MSHFlexGrid1.ColSel = MSHFlexGrid1.Cols - 1
   MSHFlexGrid1.Clip = rsVar

   ' Reset the grid's selected range of cells
   MSHFlexGrid1.RowSel = MSHFlexGrid1.Row
   MSHFlexGrid1.ColSel = MSHFlexGrid1.Col

   rs.Close
   Set rs = Nothing
   cn.Close
   Set cn = Nothing 

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:

Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

MORE INFORMATION

This behavior of the MSHFlexGrid can be demonstrated against various back- ends including SQL Server, Access, etc.

Steps to Reproduce Behavior

Test Table

1. Create a simple table with the following fields:




     Name         Data Type (SQL Server)       Data Type(Access) 
  ------------------------------------------------------------------

     PartID          Integer                      Integer
     PartName        VarChar (10)                 Text (10) 

2. Insert about 3000 - 10000 rows in your table. For simplicity, you can create a loop and insert the same record in a counter of 3000 to 10000.



3. Save your table as "Test."
   
   NOTE: You can choose any other back-end to perform the test.

Visual Basic Client

1. Start a new Standard EXE project in Visual Basic. Form1 is created by default.



2. Select "Components" on the Project menu, and choose the following components:



• Microsoft ADO Data Control 6.0 (OLE DB).
• Microsoft Hierarchical FlexGrid Control 6.0.


3. Select References on the Project menu, and click "Microsoft ActiveX Data Objects 2.0 Library."



4. Place the following objects on the form:




    Control             Name                  Caption
   -------------------------------------------------------------------

   CommandButton       Command1           Using ADO Recordset
   CommandButton       Command2           Using ADODC
   CommandButton       Command3           Free MSHFlexGrid
   MSHFlexGrid         MSHFlexGrid1       Testing MSHFlexGrid Display
   ADODC               Adodc1 

5. Bind ADODC via your DSN or via your native OLEDB provider (if it exists). In the RecordSource property, write: Select * From Test.



6. Place the following code in the General Declaration section of Form1:




       Option Explicit

       Private Sub Command1_Click()

          Dim cn As New ADODB.Connection
          Dim rs As New ADODB.Recordset

          cn.Open "Testing"               '<-- Your DSN

          rs.Open "select * from Test", cn, adOpenStatic, adLockOptimistic
          rs.MoveLast

          ' Check the number records in your ADO recordset
          ' The RecordCount property of the ADO recordset reflects the
          ' actual number of records

          Debug.Print "ADO recordset record-count: " & vbTab & _
              rs.RecordCount

          Form1.Caption = "Loading grid... please wait..."

          Set MSHFlexGrid1.Recordset = rs

          ' Check the number of rows that the Hierarchical FlexGrid
          ' contains The RecordCount property of the Hierarchical
          ' FlexGrid also reflects the actual number of records

          Debug.Print "MSHFlexGrid1 Recordset record-count: " & vbTab &  _
             MSHFlexGrid1.Recordset.RecordCount

          Form1.Caption = "MSHFlexGrid Display Sample"

          ' Free resources
          rs.Close
          Set rs = Nothing
          cn.Close
          Set cn = Nothing

       End Sub

       Private Sub Command2_Click()

          Form1.Caption = "Loading data... please wait..."

          ' Set the Grid's source to be ADODC
          Set MSHFlexGrid1.DataSource = Adodc1

          ' Check the number of records in ADODC recordset
          Debug.Print "ADO data control record-count: " & vbTab &  _
             Adodc1.Recordset.RecordCount
          Form1.Caption = "MSHFlexGrid Display Sample"
       End Sub

       Private Sub Command3_Click()
          MSHFlexGrid1.Clear
          Form1.Caption = "Grid is clear now..."
       End Sub 

7. Press the F5 key to run the code, and note that only 2048 records are displayed in the MSHFlexGrid.
   
   NOTE: Connecting to the data source using the OLEDB Provider for ODBC or using the native OLEDB Provider has no effect on the Hierarchical FlexGrid behavior.

Additional query words:

Keywords : kbVBp600bug kbVS600sp3fix
Version : WINDOWS:6.0
Platform : WINDOWS
Issue type : kbbug