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| <h2 title="Annotation Type ForeignKey" class="title">Annotation Type ForeignKey</h2> |
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| <pre>@Target(value={}) |
| @Retention(value=RUNTIME) |
| public @interface <span class="memberNameLabel">ForeignKey</span></pre> |
| <div class="block">Used to specify the handling of foreign key constraints when schema |
| generation is in effect. If this annotation is not specified, the |
| persistence provider's default foreign key strategy will be used. |
| <p> |
| The <code>ConstraintMode</code> value is used to specify whether foreign |
| key constraints should be generated. |
| <p> |
| The syntax used in the <code>foreignKeyDefinition</code> element |
| should follow the SQL syntax used by the target database for foreign |
| key constraints. For example, this may be similar the following: |
| <pre> |
| FOREIGN KEY ( <COLUMN expression> {, <COLUMN expression>}... ) |
| REFERENCES <TABLE identifier> [ |
| (<COLUMN expression> {, <COLUMN expression>}... ) ] |
| [ ON UPDATE <referential action> ] |
| [ ON DELETE <referential action> ] |
| </pre> |
| |
| When the <code>ConstraintMode</code> value is |
| <code>CONSTRAINT</code>, but the <code>foreignKeyDefinition</code> |
| element is not specified, the provider will generate foreign key |
| constraints whose update and delete actions it determines most |
| appropriate for the join column(s) to which the foreign key |
| annotation is applied.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../javax/persistence/JoinColumn.html" title="annotation in javax.persistence"><code>JoinColumn</code></a>, |
| <a href="../../javax/persistence/JoinColumns.html" title="annotation in javax.persistence"><code>JoinColumns</code></a>, |
| <a href="../../javax/persistence/MapKeyJoinColumn.html" title="annotation in javax.persistence"><code>MapKeyJoinColumn</code></a>, |
| <a href="../../javax/persistence/MapKeyJoinColumns.html" title="annotation in javax.persistence"><code>MapKeyJoinColumns</code></a>, |
| <a href="../../javax/persistence/PrimaryKeyJoinColumn.html" title="annotation in javax.persistence"><code>PrimaryKeyJoinColumn</code></a>, |
| <a href="../../javax/persistence/JoinTable.html" title="annotation in javax.persistence"><code>JoinTable</code></a>, |
| <a href="../../javax/persistence/CollectionTable.html" title="annotation in javax.persistence"><code>CollectionTable</code></a>, |
| <a href="../../javax/persistence/SecondaryTable.html" title="annotation in javax.persistence"><code>SecondaryTable</code></a>, |
| <a href="../../javax/persistence/AssociationOverride.html" title="annotation in javax.persistence"><code>AssociationOverride</code></a></dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>2.1</dd> |
| </dl> |
| </li> |
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| <!-- =========== ANNOTATION TYPE OPTIONAL MEMBER SUMMARY =========== --> |
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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>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/ForeignKey.html#foreignKeyDefinition--">foreignKeyDefinition</a></span></code> |
| <div class="block">(Optional) The foreign key constraint definition.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>java.lang.String</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/ForeignKey.html#name--">name</a></span></code> |
| <div class="block">(Optional) The name of the foreign key constraint.</div> |
| </td> |
| </tr> |
| <tr class="altColor"> |
| <td class="colFirst"><code><a href="../../javax/persistence/ConstraintMode.html" title="enum in javax.persistence">ConstraintMode</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../javax/persistence/ForeignKey.html#value--">value</a></span></code> |
| <div class="block">(Optional) Used to specify whether a foreign key constraint should be |
| generated when schema generation is in effect.</div> |
| </td> |
| </tr> |
| </table> |
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| <h4>name</h4> |
| <pre>public abstract java.lang.String name</pre> |
| <div class="block">(Optional) The name of the foreign key constraint. If this |
| is not specified, it defaults to a provider-generated name.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>""</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>value</h4> |
| <pre>public abstract <a href="../../javax/persistence/ConstraintMode.html" title="enum in javax.persistence">ConstraintMode</a> value</pre> |
| <div class="block">(Optional) Used to specify whether a foreign key constraint should be |
| generated when schema generation is in effect. |
| <p> |
| A value of <code>CONSTRAINT</code> will cause the persistence |
| provider to generate a foreign key constraint. If the |
| <code>foreignKeyDefinition</code> element is not specified, the |
| provider will generate a constraint whose update |
| and delete actions it determines most appropriate for the |
| join column(s) to which the foreign key annotation is applied. |
| <p> |
| A value of <code>NO_CONSTRAINT</code> will result in no |
| constraint being generated. |
| <p> |
| A value of <code>PROVIDER_DEFAULT</code> will result in the |
| provider's default behavior (which may or may not result |
| in the generation of a constraint for the given join column(s).</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>javax.persistence.ConstraintMode.CONSTRAINT</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>foreignKeyDefinition</h4> |
| <pre>public abstract java.lang.String foreignKeyDefinition</pre> |
| <div class="block">(Optional) The foreign key constraint definition.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>""</dd> |
| </dl> |
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