next
Move the cursor forward one row from its current row position. Caution: next() method and iterator() method share same data structure. Please don't use them together. Caution: In case ResultSet is obtained from QueryChangeListener, and QueryChangeListener is already removed from Query, ResultSet is already freed. And this next() method returns null.
Return
the Result after moving the cursor forward. Returns null
value if there are no more rows, or ResultSet is freed already.