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| <h2 title="Annotation Type EmbeddedId" class="title">Annotation Type EmbeddedId</h2> |
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| <pre>@Target(value={METHOD,FIELD}) |
| @Retention(value=RUNTIME) |
| public @interface <span class="memberNameLabel">EmbeddedId</span></pre> |
| <div class="block">Applied to a persistent field or property of an entity |
| class or mapped superclass to denote a composite primary |
| key that is an embeddable class. The embeddable class |
| must be annotated as <a href="../../jakarta/persistence/Embeddable.html" title="annotation in jakarta.persistence"><code>Embeddable</code></a>. |
| |
| <p> There must be only one <code>EmbeddedId</code> annotation and |
| no <code>Id</code> annotation when the <code>EmbeddedId</code> annotation is used. |
| |
| <p> The <a href="../../jakarta/persistence/AttributeOverride.html" title="annotation in jakarta.persistence"><code>AttributeOverride</code></a> annotation may be used to override |
| the column mappings declared within the embeddable class. |
| |
| <p> The <a href="../../jakarta/persistence/MapsId.html" title="annotation in jakarta.persistence"><code>MapsId</code></a> annotation may be used in conjunction |
| with the <code>EmbeddedId</code> annotation to specify a derived |
| primary key. |
| |
| <p> If the entity has a derived primary key, the |
| <code>AttributeOverride</code> annotation may only be used to |
| override those attributes of the embedded id that do not correspond |
| to the relationship to the parent entity. |
| |
| <p> Relationship mappings defined within an embedded id class are not supported. |
| |
| <pre> |
| Example 1: |
| |
| @EmbeddedId |
| protected EmployeePK empPK; |
| |
| |
| Example 2: |
| |
| @Embeddable |
| public class DependentId { |
| String name; |
| EmployeeId empPK; // corresponds to primary key type of Employee |
| } |
| |
| @Entity |
| public class Dependent { |
| // default column name for "name" attribute is overridden |
| @AttributeOverride(name="name", @Column(name="dep_name")) |
| @EmbeddedId DependentId id; |
| ... |
| @MapsId("empPK") |
| @ManyToOne Employee emp; |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.0</dd> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../jakarta/persistence/Embeddable.html" title="annotation in jakarta.persistence"><code>Embeddable</code></a>, |
| <a href="../../jakarta/persistence/MapsId.html" title="annotation in jakarta.persistence"><code>MapsId</code></a></dd> |
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