Hello,
We have a tool that has a task to look at an existing feature class to find the highest number in a field called INDEX and return the next number. It then adds the next numbers to features that will be loaded into the main feature class.
When the tool is used and the data source is a 9.3 Oracle SDE point feature class it works correctly by returning the next highest number, but when I tried using it on a 10.2.2 SQL Server point feature class, it returns the next "available" number. In this case a feature had been deleted freeing up a number that was not the highest. It was this number that the tool returned for the SQL Server feature class.
Here is the code for the function:
Any ideas why it is doing this? Is there a difference in how the code behaves between the two versions?
I am going to create a point feature class that has no number gap and see if it works to confirm the possible issue.
Any thoughts appreciated,
Amy Rose
Public Function GetNextHighestINDEX() As Long
Try
Dim pDS As IDataset
Dim pTable As ITable
Dim pCursor As ICursor
Dim pRow As IRow
Dim pQueryFilter As IQueryFilter
Dim i As Long
Dim pMxDoc As IMxDocument
Dim pMap As IMap
Dim pFLayer As IFeatureLayer
Dim pFCls As IFeatureClass
pMxDoc = My.ArcMap.Document
pMap = pMxDoc.ActiveView
'--- Set the input Point feature class
pFCName = "GIS.POINTS"
For i = 0 To pMap.LayerCount - 1
If TypeOf pMap.Layer(i) Is IFeatureLayer Then
pFLayer = pMap.Layer(i)
pFCls = pFLayer.FeatureClass
pDS = pFCls
If UCase(pDS.Name) = UCase(Trim(pFCName)) Then
NodesFC = pFCls
Exit For
End If
End If
Next i
If NodesFC Is Nothing Then
MsgBox("No GIS.POINTS Layer Found in Map")
Exit Function
End If
pTable = NodesFC
pQueryFilter = New QueryFilter
pQueryFilter.WhereClause = "INDEX is not null and (INDEX Like '1_____' or INDEX Like '2_____' or INDEX Like '3_____' or INDEX Like '4_____' or INDEX Like '5_____' or INDEX Like '6_____' or INDEX Like '7_____' or INDEX Like '8_____' or INDEX Like '9_____' or INDEX Like '10_____')"
Dim pTableSort As ITableSort = New TableSortClass()
'pTableSort.Table = Table
With pTableSort
.Fields = "INDEX"
.Ascending("INDEX") = False 'False for descending order
.QueryFilter = pQueryFilter
.Table = pTable
End With
'apply sort
pTableSort.Sort(Nothing)
'Use cursor to find highest number
pCursor = pTableSort.Rows
'There's no need to loop cause you just want the highest number so the first row should be it
'Dim pRow As IRow
pRow = pCursor.NextRow
GetNextHighestINDEX = pRow.Value(NodesFC.Fields.FindField("INDEX")) + 1
Catch ex As Exception
MsgBox(ex.Message & ex.StackTrace)
End Try
End Function
