NHibernate - Retrieve specific columns and count using criteria querie

Question

This is my mapping file:

class name="CRMStradCommon.Entities.OportunidadEntity,CRMStradCommon" table="oportunidad">

    <id name="Id" column="id" type="int">
        <generator class="native" />
    </id>
    <property name="Titulo" column="titulo" type="string" not-null="true" />
    <many-to-one name="Estado" column="estado" class="CRMStradCommon.Entities.EstadoOportunidadEntity,CRMStradCommon"  />
    <many-to-one name="Dueno" column="dueno" class="CRMStradCommon.Entities.ContactoEntity,CRMStradCommon"  />
    <property name="FechaCierreEstimado" column="fecha_cierre_estimado" type="DateTime" not-null="false"/>
    <property name="FechaVencimiento" column="fecha_vencimiento" type="DateTime" not-null="false"/>
</class>

This is the other with joined-subclass

class name="CRMStradCommon.Entities.ContactoEntity,CRMStradCommon" table="contacto" dynamic-update="true">

    <id name="Id" column="id" type="int">
        <generator class="native" />
    </id>
    <property name="Nombre" column="nombre" type="string" not-null="true" />
    <property name="Email1" column="email1" type="string" />
    <property name="Email2" column="email2" type="string" />
    <property name="Web1" column="web1" type="string" />
    <property name="Web2" column="web2" type="string" />
    <bag name="DuenoOportunidadList" lazy="true" inverse="true">
        <key column="dueno"/>
        <one-to-many class="CRMStradCommon.Entities.OportunidadEntity,CRMStradCommon"/>
    </bag>
    <joined-subclass name="CRMStradCommon.Entities.EmpresaEntity,CRMStradCommon" table="empresa" lazy="false">
        <key column="id" />
        <many-to-one name="Categoria" column="categoria" class="CRMStradCommon.Entities.CategoriaEmpresaEntity,CRMStradCommon"  />
        <many-to-one name="Calificacion" column="calificacion" class="CRMStradCommon.Entities.CalificacionEmpresaEntity,CRMStradCommon"  />
    </joined-subclass>
    <joined-subclass  name="CRMStradCommon.Entities.PersonaEntity,CRMStradCommon" table="persona" lazy="false">
        <key column="id" />
        <property name="Saludo" column="saludo" type="string" />
        <property name="Apellido" column="apellido" type="string" />
        <property name="SegundoNombre" column="segundo_nombre" type="string" />
    </joined-subclass>
</class>

Haw can I make this query with Criteria?

SELECT contacto.id, contacto.nombre, persona.apellido, COUNT(*) AS Cant FROM contacto INNER JOIN oportunidad ON contacto.id = oportunidad.dueno LEFT OUTER JOIN persona ON contacto.id = persona.id LEFT OUTER JOIN empresa ON contacto.id = empresa.id GROUP BY contacto.id, contacto.nombre, persona.apellido ORDER BY contacto.nombre, persona.apellido

Thanks a lot!

Answer 1

You want to use projections. Something like this:

session.createCriteria(ContactoEntity.class)
  .setProjection(Projections.projectionList()
    .add(Projections.groupProperty("id")
    .add(Projections.groupProperty("nombre")
    .add(Projections.groupProperty("apellido")
    .add(Projections.rowCount()));

UPDATE - I just noticed that you're using NHibernate, and I'm a Java user so the code snippet I gave may need to be tweaked for your use. Hope it helps.

Answer 2

Thanks a Lot! It solved a part of my problem. I did this:

                    ICriteria criteria = session.CreateCriteria(typeof(ContactoEntity));
                criteria.SetProjection(Projections.ProjectionList()
                    .Add(Projections.GroupProperty("Id"),"Id")
                    .Add(Projections.GroupProperty("Nombre"),"Nombre")
                    .Add(Projections.GroupProperty("Apellido"), "Apellido")
                    .Add(Projections.GroupProperty("TipoContacto"), "TipoContacto")
                    .Add(Projections.RowCount(),"CantOportunidadesDueno"));
                criteria.CreateCriteria("DuenoOportunidadList");
                criteria.AddOrder(Order.Asc("Nombre")).AddOrder(Order.Asc("Apellido"));
                criteria.SetResultTransformer(
                    new NHibernate.Transform.AliasToBeanResultTransformer(typeof(ContactoEntity)));
                IList<ContactoEntity> ContLst = (criteria.List<ContactoEntity>());

I used Transformer in order to make a colection of Contacto Entities, but the problem is with property Apellido. I have it in subclass Persona and the collection is made only with parent class and not with children classes.

do you know if it is possible to solve that? or the only solution I have is to go throw each collection item without using transformer and creating a new collection of Contacto entities creating each new object?

thanks!!!