Examples of org.hibernate.criterion.Projection

org.hibernate.criterion.Projection
An object-oriented representation of a query result set projection in a {@link Criteria} query.Built-in projection types are provided by the {@link Projections} factory class. This interface might beimplemented by application classes that define custom projections. @author Gavin King @author Steve Ebersole @see Projections @see Criteria


  public Type getTypeUsingProjection(Criteria subcriteria, String propertyName)
      throws HibernateException {


    //first look for a reference to a projection alias
    final Projection projection = rootCriteria.getProjection();
    Type[] projectionTypes = projection == null ?
                             null :
                             projection.getTypes( propertyName, subcriteria, this );


    if ( projectionTypes == null ) {
      try {
        //it does not refer to an alias of a projection,
        //look for a property

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          .add( Projections.property("c.courseCode") )
          .add( Projections.property("c.description") )
        )
      .uniqueResult();
      
    Projection p1 = Projections.projectionList()
      .add( Projections.count("studentNumber") )
      .add( Projections.max("studentNumber") )
      .add( Projections.rowCount() );
    
    Projection p2 = Projections.projectionList()
      .add( Projections.min("studentNumber") )
      .add( Projections.avg("studentNumber") )
      .add( Projections.sqlProjection(
          "1 as constOne, count(*) as countStar", 
          new String[] { "constOne", "countStar" },

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          .add( Property.forName("c.courseCode") )
          .add( Property.forName("c.description") )
        )
      .uniqueResult();
      
    Projection p1 = Projections.projectionList()
      .add( Property.forName("studentNumber").count() )
      .add( Property.forName("studentNumber").max() )
      .add( Projections.rowCount() );
    
    Projection p2 = Projections.projectionList()
      .add( Property.forName("studentNumber").min() )
      .add( Property.forName("studentNumber").avg() )
      .add( Projections.sqlProjection(
          "1 as constOne, count(*) as countStar", 
          new String[] { "constOne", "countStar" },

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  public String[] getColumnsUsingProjection(
      Criteria subcriteria,
          String propertyName) throws HibernateException {


    //first look for a reference to a projection alias
    final Projection projection = rootCriteria.getProjection();
    String[] projectionColumns = projection == null ?
                                 null :
                                 projection.getColumnAliases( propertyName, 0 );


    if ( projectionColumns == null ) {
      //it does not refer to an alias of a projection,
      //look for a property
      try {

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  public Type getTypeUsingProjection(Criteria subcriteria, String propertyName)
      throws HibernateException {


    //first look for a reference to a projection alias
    final Projection projection = rootCriteria.getProjection();
    Type[] projectionTypes = projection == null ?
                             null :
                             projection.getTypes( propertyName, subcriteria, this );


    if ( projectionTypes == null ) {
      try {
        //it does not refer to an alias of a projection,
        //look for a property

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