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| <h2 title="Annotation Type MapsId" class="title">Annotation Type MapsId</h2> |
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| <pre>@Target(value={METHOD,FIELD}) |
| @Retention(value=RUNTIME) |
| public @interface <span class="memberNameLabel">MapsId</span></pre> |
| <div class="block">Designates a <code>ManyToOne</code> or |
| <code>OneToOne</code> relationship attribute that provides the |
| mapping for an <a href="../../jakarta/persistence/EmbeddedId.html" title="annotation in jakarta.persistence"><code>EmbeddedId</code></a> primary key, an attribute within |
| an <code>EmbeddedId</code> primary key, or a simple primary key of |
| the parent entity. The <code>value</code> element specifies the |
| attribute within a composite key to which the relationship |
| attribute corresponds. If the entity's primary key is of the same |
| Java type as the primary key of the entity referenced by the |
| relationship, the value attribute is not specified. |
| |
| <pre> |
| Example: |
| |
| // parent entity has simple primary key |
| |
| @Entity |
| public class Employee { |
| @Id long empId; |
| String name; |
| ... |
| } |
| |
| // dependent entity uses EmbeddedId for composite key |
| |
| @Embeddable |
| public class DependentId { |
| String name; |
| long empid; // corresponds to primary key type of Employee |
| } |
| |
| @Entity |
| public class Dependent { |
| @EmbeddedId DependentId id; |
| ... |
| @MapsId("empid") // maps the empid attribute of embedded id |
| @ManyToOne Employee emp; |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.0</dd> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Optional Element and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapsId.html#value--">value</a></span></code> |
| <div class="block">(Optional) The name of the attribute within the composite key |
| to which the relationship attribute corresponds.</div> |
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| <h4>value</h4> |
| <pre>public abstract java.lang.String value</pre> |
| <div class="block">(Optional) The name of the attribute within the composite key |
| to which the relationship attribute corresponds. If not |
| supplied, the relationship maps the entity's primary |
| key.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>""</dd> |
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