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| <div class="subTitle">jakarta.persistence</div> |
| <h2 title="Annotation Type ManyToMany" class="title">Annotation Type ManyToMany</h2> |
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| <pre>@Target(value={METHOD,FIELD}) |
| @Retention(value=RUNTIME) |
| public @interface <span class="memberNameLabel">ManyToMany</span></pre> |
| <div class="block">Specifies a many-valued association with many-to-many multiplicity. |
| |
| <p> Every many-to-many association has two sides, the owning side |
| and the non-owning, or inverse, side. The join table is specified |
| on the owning side. If the association is bidirectional, either |
| side may be designated as the owning side. If the relationship is |
| bidirectional, the non-owning side must use the <code>mappedBy</code> element of |
| the <code>ManyToMany</code> annotation to specify the relationship field or |
| property of the owning side. |
| |
| <p> The join table for the relationship, if not defaulted, is |
| specified on the owning side. |
| |
| <p> The <code>ManyToMany</code> annotation may be used within an |
| embeddable class contained within an entity class to specify a |
| relationship to a collection of entities. If the relationship is |
| bidirectional and the entity containing the embeddable class is the |
| owner of the relationship, the non-owning side must use the |
| <code>mappedBy</code> element of the <code>ManyToMany</code> |
| annotation to specify the relationship field or property of the |
| embeddable class. 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: |
| |
| // In Customer class: |
| |
| @ManyToMany |
| @JoinTable(name="CUST_PHONES") |
| public Set<PhoneNumber> getPhones() { return phones; } |
| |
| // In PhoneNumber class: |
| |
| @ManyToMany(mappedBy="phones") |
| public Set<Customer> getCustomers() { return customers; } |
| |
| Example 2: |
| |
| // In Customer class: |
| |
| @ManyToMany(targetEntity=com.acme.PhoneNumber.class) |
| public Set getPhones() { return phones; } |
| |
| // In PhoneNumber class: |
| |
| @ManyToMany(targetEntity=com.acme.Customer.class, mappedBy="phones") |
| public Set getCustomers() { return customers; } |
| |
| Example 3: |
| |
| // In Customer class: |
| |
| @ManyToMany |
| @JoinTable(name="CUST_PHONE", |
| joinColumns= |
| @JoinColumn(name="CUST_ID", referencedColumnName="ID"), |
| inverseJoinColumns= |
| @JoinColumn(name="PHONE_ID", referencedColumnName="ID") |
| ) |
| public Set<PhoneNumber> getPhones() { return phones; } |
| |
| // In PhoneNumberClass: |
| |
| @ManyToMany(mappedBy="phones") |
| public Set<Customer> getCustomers() { return customers; } |
| </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/JoinTable.html" title="annotation in jakarta.persistence"><code>JoinTable</code></a></dd> |
| </dl> |
| </li> |
| </ul> |
| </div> |
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| <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/ManyToMany.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/ManyToMany.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>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/ManyToMany.html#mappedBy--">mappedBy</a></span></code> |
| <div class="block">The field that owns the relationship.</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/ManyToMany.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> |
| </div> |
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| <!-- ============ ANNOTATION TYPE MEMBER DETAIL =========== --> |
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| </a> |
| <h3>Element Detail</h3> |
| <a name="targetEntity--"> |
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| </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. Optional only if the collection-valued |
| relationship property is defined using Java generics. Must be |
| specified otherwise. |
| |
| <p> Defaults to the parameterized type of |
| the collection when defined using generics.</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> When the target collection is a <code>java.util.Map</code>, the <code>cascade</code> element applies to the |
| map value. |
| |
| <p> Defaults to no operations being 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 entities |
| must be eagerly fetched. The LAZY strategy is a hint to the |
| persistence provider runtime.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>jakarta.persistence.FetchType.LAZY</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
| </ul> |
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| <li class="blockList"><a name="mappedBy--"> |
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| </a> |
| <ul class="blockListLast"> |
| <li class="blockList"> |
| <h4>mappedBy</h4> |
| <pre>public abstract java.lang.String mappedBy</pre> |
| <div class="block">The field that owns the relationship. Required unless |
| the relationship is unidirectional.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>""</dd> |
| </dl> |
| </li> |
| </ul> |
| </li> |
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