Is it possible to create a recursive query in Access?

Question

I have a job table

Id
ParentID
jobName
jobStatus

The root ParentID is 0.

Is it possible in Access to create a query to

Answer 1

I had a related problem working with a treeview structure, when a user wants to delete a node, he wants to delete all then nodes under that tree. Childs, childs of childs etc etc.

A job for recursion....

So to delete the data in your table to match the treeview node deletes, use a recursive function that will delete the node, and recurse down and delete all the nodes that are children, grandchildren ect.

example of the function:

Public Sub RemoveChildKeys(MyKey)
' deletes passed key and removes all children and grandchildren ect etc of passed key recursively

   Dim TheDB As DAO.Database
   Dim TheTable As DAO.Recordset
   Dim MySql As String

   Set TheDB = CurrentDb

   MySql = "Select * from TblIndex WHERE [Parent]=" & MyKey & ";"
   Set TheTable = TheDB.OpenRecordset(MySql)

   While Not TheTable.EOF
     RemoveChildKeys (TheTable!Key)  ' <---- Calls itself
     TheTable.MoveNext
   Wend

   DoCmd.RunSQL "Delete * FROM TblIndex WHERE [Key]=" & MyKey  ' delete in table

End Sub