Holdable result sets

When you create a statement, you can specify that the result set will be automatically closed when a commit occurs. Result sets are automatically closed when a transaction aborts, whether or not they have been specified to be held open.

To specify whether a result set should be held open after a commit takes place, supply one of the following ResultSet parameters to the Connection method createStatement, prepareStatement, or prepareCall:

• CLOSE_CURSORS_AT_COMMIT

  Result sets are closed when an implicit or explicit commit is performed.

• HOLD_CURSORS_OVER_COMMIT

  Result sets are held open when a commit is performed, implicitly or explicitly. This is the default behavior.

The method Statement.getResultSetHoldability() indicates whether a result set generated by the Statement object stays open or closes, upon commit. See the Derby Reference Manual for more information.

When an implicit or explicit commit occurs, result sets that hold cursors open behave as follows:

• Open result sets remain open. Non-scrollable result sets becomes positioned before the next logical row of the result set. Scrollable insensitive result sets keep their current position.
• When the session is terminated, the result set is closed and destroyed.
• All locks are released, including locks protecting the current cursor position.
• For non-scrollable result sets, immediately following a commit, the only valid operations that can be performed on the ResultSet object are:
  • positioning the result set to the next row with ResultSet.next().
  • closing the result set with ResultSet.close().