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| <h2 title="Annotation Type ManyToOne" class="title">Annotation Type ManyToOne</h2> |
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| <pre>@Target(value={METHOD,FIELD}) |
| @Retention(value=RUNTIME) |
| public @interface <span class="memberNameLabel">ManyToOne</span></pre> |
| <div class="block">Specifies a single-valued association to another entity class that |
| has many-to-one multiplicity. It is not normally necessary to |
| specify the target entity explicitly since it can usually be |
| inferred from the type of the object being referenced. If the |
| relationship is bidirectional, the non-owning |
| <code>OneToMany</code> entity side must used the |
| <code>mappedBy</code> element to specify the relationship field or |
| property of the entity that is the owner of the relationship. |
| |
| <p> The <code>ManyToOne</code> annotation may be used within an |
| embeddable class to specify a relationship from the embeddable |
| class to an entity class. If the relationship is bidirectional, the |
| non-owning <code>OneToMany</code> entity side must use the <code>mappedBy</code> |
| element of the <code>OneToMany</code> annotation to specify the |
| relationship field or property of the embeddable field or property |
| on the owning side of the relationship. The dot (".") notation |
| syntax must be used in the <code>mappedBy</code> element to indicate the |
| relationship attribute within the embedded attribute. The value of |
| each identifier used with the dot notation is the name of the |
| respective embedded field or property. |
| <pre> |
| |
| Example 1: |
| |
| @ManyToOne(optional=false) |
| @JoinColumn(name="CUST_ID", nullable=false, updatable=false) |
| public Customer getCustomer() { return customer; } |
| |
| |
| Example 2: |
| |
| @Entity |
| public class Employee { |
| @Id int id; |
| @Embedded JobInfo jobInfo; |
| ... |
| } |
| |
| @Embeddable |
| public class JobInfo { |
| String jobDescription; |
| @ManyToOne ProgramManager pm; // Bidirectional |
| } |
| |
| @Entity |
| public class ProgramManager { |
| @Id int id; |
| @OneToMany(mappedBy="jobInfo.pm") |
| Collection<Employee> manages; |
| } |
| |
| </pre></div> |
| <dl> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>1.0</dd> |
| <dt><span class="simpleTagLabel">Examples (en):</span></dt> |
| <dd><a href="../../../../../tomee-9.0/examples/rest-example.html">rest-example</a>, <a href="../../../../../tomee-9.0/examples/deltaspike-fullstack.html">deltaspike-fullstack</a></dd> |
| <dt><span class="simpleTagLabel">Examples (pt):</span></dt> |
| <dd><a href="../../../../../tomee-9.0/pt/examples/deltaspike-fullstack.html">deltaspike-fullstack</a></dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
| <div class="summary"> |
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| <!-- =========== ANNOTATION TYPE OPTIONAL MEMBER SUMMARY =========== --> |
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| <li class="blockList"><a name="annotation.type.optional.element.summary"> |
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| </a> |
| <h3>Optional Element Summary</h3> |
| <table class="memberSummary" border="0" cellpadding="3" cellspacing="0" summary="Optional Element Summary table, listing optional elements, and an explanation"> |
| <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><a href="../../jakarta/persistence/CascadeType.html" title="enum in jakarta.persistence">CascadeType</a>[]</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/ManyToOne.html#cascade--">cascade</a></span></code> |
| <div class="block">(Optional) The operations that must be cascaded to |
| the target of the association.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="../../jakarta/persistence/FetchType.html" title="enum in jakarta.persistence">FetchType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/ManyToOne.html#fetch--">fetch</a></span></code> |
| <div class="block">(Optional) Whether the association should be lazily |
| loaded or must be eagerly fetched.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/ManyToOne.html#optional--">optional</a></span></code> |
| <div class="block">(Optional) Whether the association is optional.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>java.lang.Class</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/ManyToOne.html#targetEntity--">targetEntity</a></span></code> |
| <div class="block">(Optional) The entity class that is the target of |
| the association.</div> |
| </td> |
| </tr> |
| </table> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <!-- --> |
| </a> |
| <h3>Element Detail</h3> |
| <a name="targetEntity--"> |
| <!-- --> |
| </a> |
| <ul class="blockList"> |
| <li class="blockList"> |
| <h4>targetEntity</h4> |
| <pre>public abstract java.lang.Class targetEntity</pre> |
| <div class="block">(Optional) The entity class that is the target of |
| the association. |
| |
| <p> Defaults to the type of the field or property |
| that stores the association.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>void.class</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <h4>cascade</h4> |
| <pre>public abstract <a href="../../jakarta/persistence/CascadeType.html" title="enum in jakarta.persistence">CascadeType</a>[] cascade</pre> |
| <div class="block">(Optional) The operations that must be cascaded to |
| the target of the association. |
| |
| <p> By default no operations are cascaded.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>{}</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <h4>fetch</h4> |
| <pre>public abstract <a href="../../jakarta/persistence/FetchType.html" title="enum in jakarta.persistence">FetchType</a> fetch</pre> |
| <div class="block">(Optional) Whether the association should be lazily |
| loaded or must be eagerly fetched. The EAGER |
| strategy is a requirement on the persistence provider runtime that |
| the associated entity must be eagerly fetched. The LAZY |
| strategy is a hint to the persistence provider runtime.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>jakarta.persistence.FetchType.EAGER</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| </a> |
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| <h4>optional</h4> |
| <pre>public abstract boolean optional</pre> |
| <div class="block">(Optional) Whether the association is optional. If set |
| to false then a non-null relationship must always exist.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>true</dd> |
| </dl> |
| </li> |
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