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| <b>Release 2.5</b><br /></font></td> |
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| <div class="refsect1"> |
| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@CascadeOnDelete</font></h2> |
| <p>Use the <code>@CascadeOnDelete</code> annotation to specify that a delete operation performed on a database object is cascaded on secondary or related tables.</p> |
| <p><code>ON DELETE CASCADE</code> is a database foreign key constraint option that automatically removes the dependent rows.</p> |
| <a id="sthref48" name="sthref48"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p>There are no elements for this annotation.</p> |
| <a id="sthref49" name="sthref49"></a> |
| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p>You can place <code>@CascadeOnDelete</code> on any relationship in which the target is defined as foreign key to the source Entity.</p> |
| <p>Add the annotation on the source relationship: <code>@OneToOne</code>, <code>@OneToMany</code>, <code>@ManyToMany</code>, and <code>@ElementCollection</code> You can also add <code>@CascadeOnDelete</code> to an Entity with a <code>@SecondaryTable</code> or <code>JOINED</code> inheritance. <a href="#CHDECJGE">Table 2-8</a> describes the affect of placing <code>@CascadeDelete</code> on these different elements</p> |
| <div class="tblhruleformal"><a id="TLJPA353" name="TLJPA353"></a><a id="sthref50" name="sthref50"></a><a id="CHDECJGE" name="CHDECJGE"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-8 Using @Cascade on Different Elements</font></em></strong></p> |
| <table class="HRuleFormal" title="Using @Cascade on Different Elements" summary="Using @Cascade on Different Elements" dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
| <col width="31%" /> |
| <col width="*" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t12"><font face="Arial, Helvetica, sans-serif"><strong>Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t12"><font face="Arial, Helvetica, sans-serif"><strong>Effect of @CascadeOnDelete</strong></font></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t12" headers="r1c1-t12"> |
| <p>Entity</p> |
| </td> |
| <td align="left" headers="r2c1-t12 r1c2-t12"> |
| <p>Defines that secondary or joined inheritance tables should cascade the delete on the database</p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t12" headers="r1c1-t12"> |
| <p>OneToOne mapping</p> |
| </td> |
| <td align="left" headers="r3c1-t12 r1c2-t12"> |
| <p>The deletion of the related object is cascaded on the database.</p> |
| <p>This is only allowed for mappedBy/target-foreign key OneToOne mappings (because of constraint direction).</p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r4c1-t12" headers="r1c1-t12"> |
| <p>OneToMany mapping</p> |
| </td> |
| <td align="left" headers="r4c1-t12 r1c2-t12"> |
| <p>For a OneToMany using a <code>mappedBy</code> or <code>JoinColumn</code>, the deletion of the related objects is cascaded on the database.</p> |
| <p>For a OneToMany using a <code>JoinTable</code>, the deletion of the join table is cascaded on the database (target objects cannot be cascaded even if private because of constraint direction).</p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r5c1-t12" headers="r1c1-t12"> |
| <p>ManyToMany mapping</p> |
| </td> |
| <td align="left" headers="r5c1-t12 r1c2-t12"> |
| <p>The deletion of the join table is cascaded on the database (target objects cannot be cascaded even if private because of constraint direction).</p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r6c1-t12" headers="r1c1-t12"> |
| <p>ElementCollection mapping</p> |
| </td> |
| <td align="left" headers="r6c1-t12 r1c2-t12"> |
| <p>The deletion of the collection table is cascaded on the database.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="tblhruleformal" --> |
| <p><code>@CascadeOnDelete</code> has the following behavior:</p> |
| <ul> |
| <li> |
| <p>DDL generation: If DDL generation is used, the generated constraint will include the cascade deletion option.</p> |
| </li> |
| <li> |
| <p>Entity: Remove will not execute SQL for deletion from secondary or joined inheritance tables (as constraint will handle deletion).</p> |
| </li> |
| <li> |
| <p>OneToOne: If the mapping uses cascading or orphanRemoval, SQL will not be executed to delete target object.</p> |
| </li> |
| <li> |
| <p>OneToMany: If the mapping uses cascading or orphanRemoval, SQL will not be executed to delete target objects.</p> |
| </li> |
| <li> |
| <p>ManyToMany: SQL will not be executed to delete from the join table.</p> |
| </li> |
| <li> |
| <p>ElementCollection: SQL will not be executed to delete from the collection table.</p> |
| </li> |
| <li> |
| <p>Cache: Cascaded objects will still be removed from the cache and persistence context.</p> |
| </li> |
| <li> |
| <p>Version locking: Version will not be verified on deletion of cascaded object.</p> |
| </li> |
| <li> |
| <p>Events: Deletion events may not be executed on the cascaded objects if the objects are not loaded.</p> |
| </li> |
| <li> |
| <p>Cascading: The remove operation should still be configured to cascade in the mapping if using CascadeOnDelete.</p> |
| </li> |
| </ul> |
| <a id="sthref51" name="sthref51"></a> |
| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#CHDHCIGF">Example 2-18</a> shows the cascading deletion of the Employee secondary table and all of its owned relationships.</p> |
| <div class="example"><a id="CHDHCIGF" name="CHDHCIGF"></a><a id="TLJPA354" name="TLJPA354"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-18 Using @CascadeOnDelete Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Entity |
| @SecondaryTable(name="EMP_SALARY") |
| <strong>@CascadeOnDelete</strong> |
| public class Employee{ |
| @Id |
| private long id; |
| private String firstName; |
| private String lastName; |
| @Column(table="EMP_SALARY") |
| private String salary; |
| @OneToOne(mappedBy="owner", orphanRemoval=true, cascade={CascadeType.ALL}) |
| @CascadeOnDelete |
| private Address address; |
| @OneToMany(mappedBy="owner", orphanRemoval=true, cascade={CascadeType.ALL}) |
| @CascadeOnDelete |
| private List<Phone> phones; |
| @ManyToMany |
| @JoinTable(name="EMP_PROJ") |
| @CascadeOnDelete |
| private List<Project> projects; |
| ... |
| } |
| |
| </pre></div> |
| <!-- class="example" --> |
| <p>In the <code>eclipselink-orm.xml</code> descriptor file, specify cascade on delete as shown in <a href="#CHDJIBAJ">Example 2-19</a></p> |
| <div class="example"><a id="CHDJIBAJ" name="CHDJIBAJ"></a><a id="TLJPA355" name="TLJPA355"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-19 Using <cascade-on-delete> XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| ... |
| <strong><cascade-on-delete>true</cascade-on-delete></strong> |
| ... |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref52" name="sthref52"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p>EclipseLink example: <code><a href="http://wiki.eclipse.org/EclipseLink/Examples/JPA/DeleteCascade">http://wiki.eclipse.org/EclipseLink/Examples/JPA/DeleteCascade</a></code></p> |
| </li> |
| <li> |
| <p>"@CascadeOnDelete"<br /> |
| <code><a href="http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Advanced_JPA_Development/Schema_Generation/CascadeOnDelete">http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Advanced_JPA_Development/Schema_Generation/CascadeOnDelete</a></code></p> |
| </li> |
| <li> |
| <p>"Enhancing Performance" in <em>Solutions Guide for EclispeLink</em></p> |
| </li> |
| </ul> |
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