BatchCollisionCount Property

Recordset.BatchCollisionCount Property (DAO)

Office 2013 or later

Last modified: June 29, 2011

Applies to: Access 2013 | Office 2013

In this article

expression .BatchCollisionCount

expression A variable that represents a Recordset object.

This property indicates how many records encountered collisions or otherwise failed to update during the last batch update attempt. The value of this property corresponds to the number of bookmarks in the BatchCollisions property.

If you set the working Recordset object's Bookmark property to bookmark values in the BatchCollisions array, you can move to each record that failed to complete the most recent batch Update operation.

After the collision records are corrected, a batch-mode Update method can be called again. At this point DAO attempts another batch update, and the BatchCollisions property again reflects the set of records that failed the second attempt. Any records that succeeded in the previous attempt are not sent in the current attempt, because they now have a RecordStatus property of dbRecordUnmodified. This process can continue as long as collisions occur, or until you abandon the updates and close the result set.

This example uses the BatchCollisionCount property and the Update method to demonstrate batch updating where any collisions are resolved by forcing the batch update.

Sub BatchX() 
 Dim wrkMain As Workspace 
 Dim conMain As Connection 
 Dim rstTemp As Recordset 
 Dim intLoop As Integer 
 Dim strPrompt As String 
 Set wrkMain = CreateWorkspace("ODBCWorkspace", _ 
 "admin", "", dbUseODBC) 
 ' This DefaultCursorDriver setting is required for 
 ' batch updating. 
 wrkMain.DefaultCursorDriver = dbUseClientBatchCursor 
 ' Note: The DSN referenced below must be configured to 
 ' use Microsoft Windows NT Authentication Mode to 
 ' authorize user access to the Microsoft SQL Server. 
 Set conMain = wrkMain.OpenConnection("Publishers", _ 
 dbDriverNoPrompt, False, _ 
 ' The following locking argument is required for 
 ' batch updating. It is also required that a table 
 ' with a primary key is used. 
 Set rstTemp = conMain.OpenRecordset( _ 
 "SELECT * FROM roysched", dbOpenDynaset, 0, _ 
 With rstTemp 
 ' Modify data in local recordset. 
 Do While Not .EOF 
 If !royalty <= 20 Then 
 !royalty = !royalty - 4 
 !royalty = !royalty + 2 
 End If 
 ' Attempt a batch update. 
 .Update dbUpdateBatch 
 ' If there are collisions, give the user the option 
 ' of forcing the changes or resolving them 
 ' individually. 
 If .BatchCollisionCount > 0 Then 
 strPrompt = "There are collisions. " & vbCr & _ 
 "Do you want the program to force " & _ 
 vbCr & "an update using the local data?" 
 If MsgBox(strPrompt, vbYesNo) = vbYes Then _ 
 .Update dbUpdateBatch, True 
 End If 
 End With 
End Sub 

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