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POHow do I query Hibernate for object where property may be null or specific value?
 

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  1. POHow do I query Hibernate for object where property may be null or specific value?
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    <p>I have the following objects I'm working with:</p> <p>RawRead RawRead.Checkpoint</p> <p>Checkpoint.EndCustomer</p> <p>Guard</p> <p>Where Checkpoint and Guard are properties of RawRead, EndCustomer is a property of Checkpoint. All are objects.</p> <hr> <p>My current Hibernate gubbins:</p> <pre><code>Criteria crit = sess.createCriteria(RawRead.class); crit.add( Restrictions.or( Restrictions.eq("checkpoint", null), Restrictions.in("checkpoint.parentEndCustomer",collectionOfEndCustomers) ) ); </code></pre> <p>So Checkpoint can be null, but if it is there I only want the RawRead objects where the parentEndCustomer object is in the checkpoint.parentEndCustomer property.</p> <p>I hope that makes sense.</p> <hr> <p>My guesstimate above produces an error that (to me) suggests that my criteria are incorrectly specified:</p> <pre><code>[Request processing failed; nested exception is org.hibernate.QueryException: could not resolve property: checkpoint.parentEndCustomer of: uk.co.romar.guardian.objects.RawRead] with root cause org.hibernate.QueryException: could not resolve property: checkpoint.parentEndCustomer of: uk.co.romar.guardian.objects.RawRead at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:81) at org.hibernate.persister.entity.AbstractPropertyMapping.toColumns(AbstractPropertyMapping.java:96) at org.hibernate.persister.entity.BasicEntityPropertyMapping.toColumns(BasicEntityPropertyMapping.java:62) at org.hibernate.persister.entity.AbstractEntityPersister.toColumns(AbstractEntityPersister.java:1457) at org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumns(CriteriaQueryTranslator.java:483) </code></pre> <p>Relevant bits of RawRead:</p> <pre><code>@ManyToOne @JoinColumn(name="CHECKPOINT_OID") @NotFound(action=NotFoundAction.IGNORE) public Checkpoint checkpoint = null; public void setCheckpoint(Checkpoint in) {this.checkpoint = in;} public Checkpoint getCheckpoint() {return this.checkpoint;} @ManyToOne @JoinColumn(name="GUARD_OID") @NotFound(action=NotFoundAction.IGNORE) private Guard guard = null; public void setGuard(Guard in) {this.guard = in;} public Guard getGuard() {return this.guard;} </code></pre> <p>And from Checkpoint:</p> <pre><code> @ManyToOne @JoinColumn(name="ENDCUSTOMER_OID") @NotFound(action=NotFoundAction.IGNORE) private EndCustomer parentEndCustomer = null; public EndCustomer getParentEndCustomer() {return this.parentEndCustomer;} public void setParentEndCustomer(EndCustomer ownerCustomer) {this.parentEndCustomer = ownerCustomer;} </code></pre> <hr> <h2>EDIT Follows after implementing first answer from below.</h2> <p>If I have some data like this in the database (I hope the notation makes sense!):</p> <pre><code>RawRead { ID=1 checkpoint={id=1,parentEndCustomer={ID=1}} } RawRead { ID=2 checkpoint={id=4,parentEndCustomer={ID=4}} } RawRead { ID=3 checkpoint={id=7,parentEndCustomer={ID=31}} } RawRead { ID=4 checkpoint={null} } </code></pre> <p>and the collectionOfEndCustomers given in the Restriction is like this: EndCustomer={ID=31}</p> <p>The I would want to retrieve RawReads 3 and 4 only. RawRead 1 &amp; 2 are rejected because the parentEndCustomer of the child checkpoint property does't match the one passed in to the restriction in collectionOfEndCustomers.</p> <p>RawRead.3 is should be selected because the parentEndCustomer matches one in the collection passed in. RawRead.4 should be selected because the checkpoint is null.</p> <p>Following the guidance in the first answer below results in all of the above RawReads being returned rather than the subset I'm after.</p>
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