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| <h2 title="Annotation Type MapKey" class="title">Annotation Type MapKey</h2> |
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| <pre>@Target(value={METHOD,FIELD}) |
| @Retention(value=RUNTIME) |
| public @interface <span class="memberNameLabel">MapKey</span></pre> |
| <div class="block">Specifies the map key for associations of type |
| <code>java.util.Map</code> when the map key is itself the primary |
| key or a persistent field or property of the entity that is |
| the value of the map. |
| |
| <p> If a persistent field or property other than the primary |
| key is used as a map key then it is expected to have a |
| uniqueness constraint associated with it. |
| |
| <p> The <a href="../../javax/persistence/MapKeyClass.html" title="annotation in javax.persistence"><code>MapKeyClass</code></a> annotation is not used when |
| <code>MapKey</code> is specified and vice versa. |
| |
| <pre> |
| |
| Example 1: |
| |
| @Entity |
| public class Department { |
| ... |
| @OneToMany(mappedBy="department") |
| @MapKey // map key is primary key |
| public Map<Integer, Employee> getEmployees() {... } |
| ... |
| } |
| |
| @Entity |
| public class Employee { |
| ... |
| @Id Integer getEmpId() { ... } |
| @ManyToOne |
| @JoinColumn(name="dept_id") |
| public Department getDepartment() { ... } |
| ... |
| } |
| |
| Example 2: |
| |
| @Entity |
| public class Department { |
| ... |
| @OneToMany(mappedBy="department") |
| @MapKey(name="name") |
| public Map<String, Employee> getEmployees() {... } |
| ... |
| } |
| |
| @Entity |
| public class Employee { |
| @Id public Integer getEmpId() { ... } |
| ... |
| @ManyToOne |
| @JoinColumn(name="dept_id") |
| public Department getDepartment() { ... } |
| ... |
| } |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>Java Persistence 1.0</dd> |
| </dl> |
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| <h3>Optional Element Summary</h3> |
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| <caption><span>Optional Elements</span><span class="tabEnd"> </span></caption> |
| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Optional Element and Description</th> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/MapKey.html#name--">name</a></span></code> |
| <div class="block">(Optional) The name of the persistent field or property of the |
| associated entity that is used as the map key.</div> |
| </td> |
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| <h4>name</h4> |
| <pre>public abstract java.lang.String name</pre> |
| <div class="block">(Optional) The name of the persistent field or property of the |
| associated entity that is used as the map key. |
| <p> Default: If the |
| <code>name</code> element is not specified, the primary key of the |
| associated entity is used as the map key. If the |
| primary key is a composite primary key and is mapped |
| as <code>IdClass</code>, an instance of the primary key |
| class is used as the key.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>""</dd> |
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