Databases
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    <p>It is not supported by JPA but if you are using hibernate as JPA provider then you can use annotation <code>@FilterDef</code> and <code>@Filter</code>.</p> <blockquote> <p><a href="http://docs.jboss.org/hibernate/core/3.6/reference/en-US/html_single/#objectstate-filters" rel="noreferrer">Hibernate Core Reference Documentation</a></p> <p>Hibernate3 has the ability to pre-define filter criteria and attach those filters at both a class level and a collection level. A filter criteria allows you to define a restriction clause similar to the existing "where" attribute available on the class and various collection elements. These filter conditions, however, can be parameterized. The application can then decide at runtime whether certain filters should be enabled and what their parameter values should be. Filters can be used like database views, but they are parameterized inside the application.</p> </blockquote> <p><strong>Exemple</strong> </p> <pre><code>@Entity public class A implements Serializable{ @Id @Column(name = "REF") private int ref; @OneToMany @JoinColumn(name = "A_REF", referencedColumnName = "REF") @Filter(name="test") private Set&lt;B&gt; bs; } @Entity @FilterDef(name="test", defaultCondition="other = 123") public class B implements Serializable{ @Id @Column(name = "A_REF") private int aRef; @Id @Column(name = "OTHER") private int other; } Session session = entityManager.unwrap(Session.class); session.enableFilter("test"); A a = entityManager.find(A.class, new Integer(0)) a.getb().size() //Only contains b that are equals to 123 </code></pre>
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    1. POannotation to filter results of a @OneToMany association
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    1. USJoel Hudon
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    1. COThanks, it works well. It's a bit annoying though that you have to enable it dynamically (I will always enable it). I'll live with it!
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      1. USXavier
    2. COThere is no upwrap method on entityManager :(
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      1. USJitendra Vispute
    3. COSorry, it's only available since JPA 2.0. http://docs.oracle.com/javaee/6/api/javax/persistence/EntityManager.html#unwrap(java.lang.Class)
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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