Key Not Unique [Resolved]

I get a Key not Unique error message when I add a record to a parent node without a child node, but when I add a record to a parent node that already has a child it works.

VB Code:

Private Sub initializeTree()
    tvwItems.ImageList = imgList
    
    Dim nodClass As Node
    Dim nodTitle As Node
    
    tvwItems.LineStyle = tvwRootLines
    tvwItems.Nodes.Clear
    
    'Initialize the recordsets
    Set rsClass = New ADODB.Recordset
    Set rsTitle = New ADODB.Recordset
 
    'Open the Class recordset
    strSQLClass = "SELECT id, classification FROM tblClassification ORDER BY classification"
    rsClass.Open strSQLClass, conTree, adOpenStatic, adLockOptimistic
    
    'set node for treeview
    If rsClass.RecordCount > 0 Then
        While Not rsClass.EOF
            Set nodClass = tvwItems.Nodes.Add(, , (rsClass.Fields("classification")), (rsClass.Fields("classification")), 1)
 
            'Opens the recordset for Title
            strSQLTitle = "SELECT id, title, classification, code, dateadded FROM tblSnipplets WHERE classification LIKE '" & (rsClass.Fields("classification")) & "%'"
            rsTitle.Open strSQLTitle, conTree, adOpenStatic, adLockOptimistic
            
            'set node for treeview
            If rsTitle.RecordCount > 0 Then
                While Not rsTitle.EOF
                    Set nodTitle = tvwItems.Nodes.Add((rsClass.Fields("classification")), tvwChild, CStr(rsTitle.Fields("id")) & " id", (rsTitle.Fields("title")), 2)
                  '  Set nodTitle = tvwItems.Nodes.Add
                    
                    nodTitle.Tag = rsTitle.Fields("Id").Value
                    rsTitle.MoveNext
                    DoEvents
                Wend
            End If
            rsTitle.Close
            
            rsClass.MoveNext
            DoEvents
        Wend
    End If
    rsClass.Close
End Sub

The problem has nothing to do with there being a child node or not. The key value must be unique throughout the whole tree. Click the Generate unique TreeView keys link in my signature for a way to ensure that all keys are unique.

I implemented the unique key function from your post and I am still getting the key not unique when I add a child.

VB Code:

Private Sub initializeTree()
    tvwItems.ImageList = imgList
    
    Dim nodClass As Node
    Dim nodTitle As Node
    
    tvwItems.LineStyle = tvwRootLines
    tvwItems.Nodes.Clear
    
    'Initialize the recordsets
    Set rsClass = New ADODB.Recordset
    Set rsTitle = New ADODB.Recordset
 
    'Open the Class recordset
    strSQLClass = "SELECT id, classification FROM tblClassification ORDER BY classification"
    rsClass.Open strSQLClass, conTree, adOpenStatic, adLockOptimistic
    
    'set node for treeview
    If rsClass.RecordCount > 0 Then
        While Not rsClass.EOF
            Set nodClass = tvwItems.Nodes.Add(, , (rsClass.Fields("classification")), (rsClass.Fields("classification")), 1)
 
            'Opens the recordset for Title
            strSQLTitle = "SELECT id, uniquekey, title, classification, code, dateadded FROM tblSnipplets WHERE classification LIKE '" & (rsClass.Fields("classification")) & "%'"
            rsTitle.Open strSQLTitle, conTree, adOpenStatic, adLockOptimistic
            
            'set node for treeview
            If rsTitle.RecordCount > 0 Then
                While Not rsTitle.EOF
                    Set nodTitle = tvwItems.Nodes.Add((rsClass.Fields("classification")), tvwChild, (rsTitle.Fields("uniquekey")), (rsTitle.Fields("title")), 2)
                  '  Set nodTitle = tvwItems.Nodes.Add
                    
                    nodTitle.Tag = rsTitle.Fields("Id").Value
                    rsTitle.MoveNext
                    DoEvents
                Wend
            End If
            rsTitle.Close
            
            rsClass.MoveNext
            DoEvents
        Wend
    End If
    rsClass.Close
End Sub

Are you trying to add a unique key with this???

...(rsTitle.Fields("uniquekey"))...

How are you generating the uniquekey field?

If you've looked at my code, what you really want to do is

Set nodTitle = tvwItems.Nodes.Add((rsClass.Fields("classification")), tvwChild, UniqueKey, (rsTitle.Fields("title")), 2)

The problem could be with your Select statement. Since you are doing a Like on the Classification field, the rsTitle recordset could contain records that were already used by another parent node.

The reverse could also be true. Your code will try to add child nodes to parent nodes that don't exist yet.

I fixed it. I was using the recordset of unique key instead of the function. Thanks for your help.