[SQLObject] request for elaboration on code

[<jws...@ra...>]

I am trying to use a postgres connection and am having an issue with the
following code from DBconnection.py


    def _queryInsertID(self, conn, table, idName, id, names, values):
        c = conn.cursor()
        if id is not None:
            names = [idName] + names
            values = [id] + values
        q = self._insertSQL(table, names, values)

        if self.debug:
            self.printDebug(conn, q, 'QueryIns')
        c.execute(q)

        if id is None:
        ^^^^^^^^^^^^^^^
            c.execute('SELECT %s FROM %s WHERE oid = %s'
                      % (idName, table, c.lastoid()))
            id = c.fetchone()[0]
        if self.debugOutput:
            self.printDebug(conn, id, 'QueryIns', 'result')
        return id

Firstly what is 'id' representing? 

Secondly, the SQL in the latter case is NOT going to work if the tables have
been created without oid's.