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POHow to use single column from composite key in jpaql or hql query
 

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  1. POHow to use single column from composite key in jpaql or hql query
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    <p>Provider is hibernate 3.6.</p> <p>I have a composite key declared via @IdClass, consisting of 4 columns. Everything works fine when it comes to storing and retrieving entity instances via a complete primary key. However, if I wish to query for all entities that have a particular value in just a single column, hibernate throws exceptions.</p> <pre><code>@Entity @IdClass(MyBeanId.class) public class MyBean { @Id private Integer partId1; @Id private Integer partId2; @Id private Integer partId3; @Id private String partId4; private Integer otherProperty1; private Double otherProperty2; private Double otherProperty3; private String otherProperty4; /* removed getters and setters */ } </code></pre> <p>query code in another class:</p> <pre><code>public List&lt;MyBean&gt; findByPartId1(Integer partId1) { return em.createQuery("select b from MyBean b where b.partId1 = :partId1", MyBean.class).setParameter("partId1", partId1).getResultList(); } </code></pre> <p>Another query which is failing, with an error message about not knowing the type of a parameter is as follows:</p> <pre><code>public List&lt;Integer&gt; getAllPartId1s() { return em.createQuery("select distinct b.partId1 from MyBean b", Integer.class).getResultList(); } </code></pre> <p>The exception I'm getting from the first query is as follows:</p> <pre><code>Caused by: org.hibernate.QueryException: could not resolve property: partId1 of: some.company.entity.MyBean [select t from some.company.entity.MyBean b where b.partId1 = :partId1] at org.hibernate.persister.entity.AbstractPropertyMapping.propertyException(AbstractPropertyMapping.java:81) at org.hibernate.persister.entity.AbstractPropertyMapping.toType(AbstractPropertyMapping.java:75) at org.hibernate.persister.entity.AbstractEntityPersister.toType(AbstractEntityPersister.java:1465) at org.hibernate.hql.ast.tree.FromElementType.getPropertyType(FromElementType.java:315) at org.hibernate.hql.ast.tree.FromElement.getPropertyType(FromElement.java:487) at org.hibernate.hql.ast.tree.DotNode.getDataType(DotNode.java:611) at org.hibernate.hql.ast.tree.DotNode.prepareLhs(DotNode.java:263) at org.hibernate.hql.ast.tree.DotNode.resolve(DotNode.java:210) at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:117) at org.hibernate.hql.ast.tree.FromReferenceNode.resolve(FromReferenceNode.java:113) at org.hibernate.hql.ast.HqlSqlWalker.resolve(HqlSqlWalker.java:880) at org.hibernate.hql.antlr.HqlSqlBaseWalker.expr(HqlSqlBaseWalker.java:1330) at org.hibernate.hql.antlr.HqlSqlBaseWalker.exprOrSubquery(HqlSqlBaseWalker.java:4471) at org.hibernate.hql.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:3944) </code></pre> <p>Surely, there is some way to access the individual columns of a composite key in a query without resorting to an @Embeddable id object? Otherwise, why even have the @IdClass mechanism, since it is all but useless. I've tried numerous variants, such as "where b.id.partId1 = :partId1" but they all fail.</p> <p>And yes, I have a MyBeanId class with the same properties and a valid hashCode and equals, but there is only so much code I want to sanitize in order to post a question.</p>
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    1. USideasculptor
    1. USideasculptor
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      1. POHow to use single column from composite key in jpaql or hql query
      1. USIdo Fishler
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    1. COIn you query `select b from MyBean b where t.partId1 = :partId1` why you have mentioned `t.partId1`, shouldn't it be `b.partId1` or it is just a typo.
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      1. USNayan Wadekar
    2. CODoes any query on MyBean work? ie "select m from MyBean m"? How about any other attribute on MyBean or is it only one of the IDs that gives you trouble?
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      1. USChris
    3. CONayan, yes, it's a typo. I changed all of the names and queries in order to sanitize code and I missed that one. The query is correct in my actual code. Chris, queries that don't reference properties that are part of the composite id work fine. "Select m from MyBean m" works fine, as does "select m from MyBean m where m.otherProerty1 = :someValue"
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      1. USideasculptor
 

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