Examples of org.hibernate.ScrollableResults.scroll()

org.hibernate.ScrollableResults.scroll()
Scroll an arbitrary number of locations @param i a positive (forward) or negative (backward) number of rows @return true if there is a result at the new location

    results.beforeFirst();
    results.next();
    Object[] result = results.get();
    assertEquals( "incorrect entityInfo returned", 1002, result[0] );


    results.scroll( 2 );
    result = results.get();
    assertEquals( "incorrect entityInfo returned", 1004, result[0] );


    results.next();
    result = results.get();

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    results.next();
    result = results.get();
    assertNull( result );


    results.scroll( -8 );
    result = results.get();
    assertNull( result );


    // And test a bad forward scroll.
    results.scroll( 10 );

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    results.scroll( -8 );
    result = results.get();
    assertNull( result );


    // And test a bad forward scroll.
    results.scroll( 10 );
    result = results.get();
    assertNull( result );


    //cleanup
    for (Object element : s.createQuery( "from " + Employee.class.getName() ).list()) s.delete( element );

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    results.afterLast();
    results.previous();
    assertTrue("afterLast() pointer incorrect", results.isLast());


    // Let's see if a bad reverse scroll screws things up
    results.scroll( -8 );
    results.next();
    assertTrue("large negative scroll() pointer incorrect", results.isFirst());


    // And test a bad forward scroll.
    results.scroll( 10 );

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    results.scroll( -8 );
    results.next();
    assertTrue("large negative scroll() pointer incorrect", results.isFirst());


    // And test a bad forward scroll.
    results.scroll( 10 );
    results.previous();
    assertTrue("large positive scroll() pointer incorrect", results.isLast());


    // Finally, let's test a REAL screwup.
    hibQuery.setFirstResult( 3 );

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    result = hibQuery.scroll();
    assertEquals( -1, result.getRowNumber() );
    result.beforeFirst();
    assertEquals( true, result.next() );
    assertTrue( result.isFirst() );
    assertTrue( result.scroll( 1 ) );
    assertTrue( result.isLast() );
    assertFalse( result.scroll( 1 ) );
    result.beforeFirst();
    while ( result.next() ) {
      s.delete( result.get()[0] );

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    result.beforeFirst();
    assertEquals( true, result.next() );
    assertTrue( result.isFirst() );
    assertTrue( result.scroll( 1 ) );
    assertTrue( result.isLast() );
    assertFalse( result.scroll( 1 ) );
    result.beforeFirst();
    while ( result.next() ) {
      s.delete( result.get()[0] );
    }
    for (Object element : s.createQuery( "from java.lang.Object" ).list()) s.delete( element );

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    projections.first();
    projection = projections.get();
    checkProjectionFirst( projection, s );


    projections.scroll( 2 );
    projection = projections.get();
    checkProjection2( projection, s );


    projections.scroll( -5 );
    projection = projections.get();

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    projections.scroll( 2 );
    projection = projections.get();
    checkProjection2( projection, s );


    projections.scroll( -5 );
    projection = projections.get();
    assertNull( projection );


    //cleanup
    for ( Object element : s.createQuery( "from " + Employee.class.getName() ).list() ) {

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    result = hibQuery.scroll();
    assertEquals( -1, result.getRowNumber() );
    result.beforeFirst();
    assertEquals( true, result.next() );
    assertTrue( result.isFirst() );
    assertTrue( result.scroll( 1 ) );
    assertTrue( result.isLast() );
    assertFalse( result.scroll( 1 ) );


    tx.commit();
    fullTextSession.close();

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