[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-817) Aggregate projection aliases should not be applied to where-clause

[David (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=32869#action_32869 ] 

David commented on HHH-817:
---------------------------

Okay, so maybe this won't ever get fixed, the correct workaround to lazy load a property using projections:

Create a criteria,

build your projection list... 
ProjectionList cols = Projections.projectionList();

Add the columns you want to be loaded on your object, to your projection list.
Make sure you include your identity property in your projection list, but don't include any column you want to query against
(see why this stinks?)

This means I can't ever lazy-load an object using its identity, unless I want to track / set it manually.

> Aggregate projection aliases should not be applied to where-clause
> ------------------------------------------------------------------
>
>                 Key: HHH-817
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-817
>             Project: Hibernate Core
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 3.0.5
>         Environment: Oracle 9.2.0.6, Hibernate 3.0.5, Spring Framework 1.2.2 based application working on Jakarta Tomcat 5.0.28
>            Reporter: Michal Jastak
>            Priority: Minor
>         Attachments: HHH-817.patch
>
>
> following java code:
> protected Entity loadEntityLightweight(Serializable entityId) throws DataAccessException {
>     Criteria criteria = getSession().createCriteria(Entity.class);    
>     ProjectionList projectionList = Projections.projectionList();
>     projectionList.add(Property.forName(BaseEntity.PROP_ID), BaseEntity.PROP_ID);
>     projectionList.add(Property.forName(BaseEntity.PROP_TYPE), BaseEntity.PROP_TYPE);
>     criteria.setProjection(projectionList);
>     criteria.add(Restrictions.eq(BaseEntity.PROP_ID, entityId));
>     criteria.setResultTransformer(new AliasToBeanResultTransformer(Entity.class));
>     return (Entity) criteria.uniqueResult();
>   }
> generates following SQL query:
> select this_.id as y0_, this_.type as y1_ from entities this_ left outer join facilities this_1_ on this_.id=this_1_.id left outer join users this_2_ on this_.id=this_2_.id left outer join addresses address2_ on this_.address_id=address2_.id left outer join entities entity3_ on this_2_.employer_id=entity3_.id left outer join facilities entity3_1_ on entity3_.id=entity3_1_.id left outer join users entity3_2_ on entity3_.id=entity3_2_.id where y0_=?
> y0_ = ? expression in where clause is causing a 904 error on Oracle 9:
> ORA-00904: "Y0_": invalid identifier
> hibernate dialect: org.hibernate.dialect.Oracle9Dialect
> mapping for Entity class:
> <?xml version="1.0"?>
> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
>                                    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
> <hibernate-mapping default-lazy="false" default-cascade="save-update">
>  
>   <class name="Entity" table="entities" mutable="true">
>     <id name="id" type="java.lang.Long" unsaved-value="null">
>       <generator class="sequence">
>         <param name="sequence">entities_id_seq</param>
>       </generator>
>     </id>
>     <many-to-one  name="address"   class="Address" column="address_id" />
>     ...
>     <!--
>       -  Facilities
>       -->
>     <joined-subclass name="Facility" table="facilities">
>       <key column="id" />
>       ...
>       <set name="users" inverse="true" lazy="true">
>         <key column="facility_id" />
>         <one-to-many class="User" />
>       </set>
>     </joined-subclass>
>     <!--
>       -  Users
>       -->
>     <joined-subclass name="User" table="users" dynamic-insert="true" dynamic-update="true">
>       <key column="id" />
>       <many-to-one name="employer"   class="Entity"  column="employer_id" cascade="none" />
>       ...
>       <set name="userAuthorities" inverse="true" cascade="all-delete-orphan">
>         <key          column="user_id" />
>         <one-to-many  class="Authority" />
>       </set>
>     </joined-subclass>
>   </class>
> </hibernate-mapping>

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