MDAC 2.5 SDK - ADO


 

Clone Method Example (VB)

See Also

This example uses the Clone method to create copies of a Recordset and then lets the user position the record pointer of each copy independently.

Public Sub CloneX()

   Dim arstStores(1 To 3) As ADODB.Recordset
   Dim intLoop As Integer
   Dim strSQL As String
   Dim strCnn As String
   Dim strMessage As String
   Dim strFind As String

   ' Assign SQL statement and connection string to variables.
   strSQL = "SELECT stor_name FROM Stores " & _
      "ORDER BY stor_name"
      strCnn = "Provider=sqloledb;" & _
      "Data Source=srv;Initial Catalog=Pubs;User Id=sa;Password=; "

   ' Open recordset as a static cursor type recordset.
   Set arstStores(1) = New ADODB.Recordset
   arstStores(1).CursorType = adOpenStatic
   arstStores(1).LockType = adLockBatchOptimistic
   arstStores(1).Open strSQL, strCnn, , , adCmdText

   ' Create two clones of the original Recordset.
   Set arstStores(2) = arstStores(1).Clone
   Set arstStores(3) = arstStores(1).Clone

   Do While True

      ' Loop through the array so that on each pass, 
      ' the user is searching a different copy of the 
      ' same Recordset.
      For intLoop = 1 To 3

         ' Ask for search string while showing where 
         ' the current record pointer is for each Recordset.
         strMessage = _
            "Recordsets from stores table:" & vbCr & _
            "  1 - Original - Record pointer at " & _
            arstStores(1)!stor_name & vbCr & _
            "  2 - Clone - Record pointer at " & _
            arstStores(2)!stor_name & vbCr & _
            "  3 - Clone - Record pointer at " & _
            arstStores(3)!stor_name & vbCr & _
            "Enter search string for #" & intLoop & ":"
         strFind = Trim(InputBox(strMessage))
         If strFind = "" Then Exit Do

         ' Find the search string; if there's no 
         ' match, jump to the last record.
         arstStores(intLoop).Filter = "stor_name >= '" & strFind & "'"
         If arstStores(intLoop).EOF Then
            arstStores(intLoop).Filter = adFilterNone
            arstStores(intLoop).MoveLast
         End If

      Next intLoop

   Loop

   arstStores(1).Close
   arstStores(2).Close
   arstStores(3).Close

End Sub