question: public < T extends PO > POResultSet < T > scroll ( ) throws DBException { String sql = buildSQL ( null , true ) ; PreparedStatement pstmt = null ; ResultSet rs = null ; POResultSet < T > rsPO = null ; try { pstmt = DB . prepareStatement ( sql , trxName ) ; rs = createResultSet ( pstmt ) ; rsPO = new POResultSet < T > ( table , pstmt , rs , trxName ) ; rsPO . setCloseOnError ( true ) ; return rsPO ; } catch ( SQLException e ) { log . log ( Level . SEVERE , sql , e ) ; throw new DBException ( e , sql ) ; } finally { if ( rsPO == null ) { DB . close ( rs , pstmt ) ; rs = null ; pstmt = null ; } } }
target:  Return a simple wrapper over a jdbc resultset. It is the caller responsibility to call the close method to release the underlying database resources.