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<div class="subTitle">jakarta.persistence</div>
<h2 title="Annotation Type MapKeyJoinColumn" class="title">Annotation Type MapKeyJoinColumn</h2>
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<pre>@Repeatable(value=<a href="../../jakarta/persistence/MapKeyJoinColumns.html" title="annotation in jakarta.persistence">MapKeyJoinColumns.class</a>)
@Target(value={METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface <span class="memberNameLabel">MapKeyJoinColumn</span></pre>
<div class="block">Specifies a mapping to an entity that is a map key. The map key
join column is in the collection table, join table, or table of the
target entity that is used to represent the map. If no
<code>MapKeyJoinColumn</code> annotation is specified, a single
join column is assumed and the default values apply.
<pre>
Example 1:
&#064;Entity
public class Company {
&#064;Id int id;
...
&#064;OneToMany // unidirectional
&#064;JoinTable(name="COMPANY_ORGANIZATION",
joinColumns=&#064;JoinColumn(name="COMPANY"),
inverseJoinColumns=&#064;JoinColumn(name="VICEPRESIDENT"))
&#064;MapKeyJoinColumn(name="DIVISION")
Map&#060;Division, VicePresident&#062; organization;
}
Example 2:
&#064;Entity
public class VideoStore {
&#064;Id int id;
String name;
Address location;
...
&#064;ElementCollection
&#064;CollectionTable(name="INVENTORY",
joinColumns=&#064;JoinColumn(name="STORE"))
&#064;Column(name="COPIES_IN_STOCK")
&#064;MapKeyJoinColumn(name="MOVIE", referencedColumnName="ID")
Map&#060;Movie, Integer&#062; videoInventory;
...
}
&#064;Entity
public class Movie {
&#064;Id long id;
String title;
...
}
Example 3:
&#064;Entity
public class Student {
&#064;Id int studentId;
...
&#064;ManyToMany // students and courses are also many-many
&#064;JoinTable(name="ENROLLMENTS",
joinColumns=&#064;JoinColumn(name="STUDENT"),
inverseJoinColumns=&#064;JoinColumn(name="SEMESTER"))
&#064;MapKeyJoinColumn(name="COURSE")
Map&#060;Course, Semester&#062; enrollment;
...
}
</pre></div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.0</dd>
<dt><span class="seeLabel">See Also:</span></dt>
<dd><a href="../../jakarta/persistence/ForeignKey.html" title="annotation in jakarta.persistence"><code>ForeignKey</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">&nbsp;</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="../../jakarta/persistence/MapKeyJoinColumn.html#columnDefinition--">columnDefinition</a></span></code>
<div class="block">(Optional) The SQL fragment that is used when generating the DDL for the
column.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code><a href="../../jakarta/persistence/ForeignKey.html" title="annotation in jakarta.persistence">ForeignKey</a></code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapKeyJoinColumn.html#foreignKey--">foreignKey</a></span></code>
<div class="block">(Optional) Used to specify or control the generation of a
foreign key constraint when table generation is in effect.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapKeyJoinColumn.html#insertable--">insertable</a></span></code>
<div class="block">(Optional) Whether the column is included in SQL INSERT statements
generated by the persistence provider.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapKeyJoinColumn.html#name--">name</a></span></code>
<div class="block">(Optional) The name of the foreign key column for the map
key.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapKeyJoinColumn.html#nullable--">nullable</a></span></code>
<div class="block">(Optional) Whether the foreign key column is nullable.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.lang.String</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapKeyJoinColumn.html#referencedColumnName--">referencedColumnName</a></span></code>
<div class="block">(Optional) The name of the column referenced by this foreign key column.</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/MapKeyJoinColumn.html#table--">table</a></span></code>
<div class="block">(Optional) The name of the table that contains the foreign key column.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapKeyJoinColumn.html#unique--">unique</a></span></code>
<div class="block">(Optional) Whether the property is a unique key.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/MapKeyJoinColumn.html#updatable--">updatable</a></span></code>
<div class="block">(Optional) Whether the column is included in SQL UPDATE statements
generated by the persistence provider.</div>
</td>
</tr>
</table>
</li>
</ul>
</li>
</ul>
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<h3>Element Detail</h3>
<a name="name--">
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<li class="blockList">
<h4>name</h4>
<pre>public abstract&nbsp;java.lang.String&nbsp;name</pre>
<div class="block">(Optional) The name of the foreign key column for the map
key. The table in which it is found depends upon the
context.
<ul>
<li> If the join is for a map key for an
element collection, the foreign key column is in the
collection table for the map value.
<li> If the join is for a map key for a ManyToMany entity
relationship or for a OneToMany entity relationship
using a join table, the foreign key column is in a join table.
<li> If the join is for a OneToMany entity relationship using
a foreign key mapping strategy, the foreign key column for the
map key is in the table of the entity that is the value of the map.
</ul>
<p> Default (only applies if a single join column is used.)
The concatenation of the following: the name of the
referencing relationship property or field of the
referencing entity or embeddable class; "_"; "KEY".</div>
<dl>
<dt>Default:</dt>
<dd>""</dd>
</dl>
</li>
</ul>
</li>
</ul>
<ul class="blockList">
<li class="blockList"><a name="referencedColumnName--">
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</a>
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<h4>referencedColumnName</h4>
<pre>public abstract&nbsp;java.lang.String&nbsp;referencedColumnName</pre>
<div class="block">(Optional) The name of the column referenced by this foreign key column.
The referenced column is in the table of the target entity.
<p> Default (only applies if single join column is being
used.) The same name as the primary key column of the
referenced table</div>
<dl>
<dt>Default:</dt>
<dd>""</dd>
</dl>
</li>
</ul>
</li>
</ul>
<ul class="blockList">
<li class="blockList"><a name="unique--">
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</a>
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<h4>unique</h4>
<pre>public abstract&nbsp;boolean&nbsp;unique</pre>
<div class="block">(Optional) Whether the property is a unique key. This is a
shortcut for the <code>UniqueConstraint</code> annotation
at the table level and is useful for when the unique key
constraint is only a single field.</div>
<dl>
<dt>Default:</dt>
<dd>false</dd>
</dl>
</li>
</ul>
</li>
</ul>
<ul class="blockList">
<li class="blockList"><a name="nullable--">
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</a>
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<h4>nullable</h4>
<pre>public abstract&nbsp;boolean&nbsp;nullable</pre>
<div class="block">(Optional) Whether the foreign key column is nullable.</div>
<dl>
<dt>Default:</dt>
<dd>false</dd>
</dl>
</li>
</ul>
</li>
</ul>
<ul class="blockList">
<li class="blockList"><a name="insertable--">
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</a>
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<h4>insertable</h4>
<pre>public abstract&nbsp;boolean&nbsp;insertable</pre>
<div class="block">(Optional) Whether the column is included in SQL INSERT statements
generated by the persistence provider.</div>
<dl>
<dt>Default:</dt>
<dd>true</dd>
</dl>
</li>
</ul>
</li>
</ul>
<ul class="blockList">
<li class="blockList"><a name="updatable--">
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</a>
<ul class="blockList">
<li class="blockList">
<h4>updatable</h4>
<pre>public abstract&nbsp;boolean&nbsp;updatable</pre>
<div class="block">(Optional) Whether the column is included in SQL UPDATE statements
generated by the persistence provider.</div>
<dl>
<dt>Default:</dt>
<dd>true</dd>
</dl>
</li>
</ul>
</li>
</ul>
<ul class="blockList">
<li class="blockList"><a name="columnDefinition--">
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</a>
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<h4>columnDefinition</h4>
<pre>public abstract&nbsp;java.lang.String&nbsp;columnDefinition</pre>
<div class="block">(Optional) The SQL fragment that is used when generating the DDL for the
column.
Defaults to SQL generated by the provider for the column.</div>
<dl>
<dt>Default:</dt>
<dd>""</dd>
</dl>
</li>
</ul>
</li>
</ul>
<ul class="blockList">
<li class="blockList"><a name="table--">
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</a>
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<h4>table</h4>
<pre>public abstract&nbsp;java.lang.String&nbsp;table</pre>
<div class="block">(Optional) The name of the table that contains the foreign key column.
<ul>
<li> If the join is for a map key for an element collection, the foreign key
column is in the collection table for the map value.
<li> If the join is for a map key for a ManyToMany entity relationship
or for a OneToMany entity relationship using a join table,
the foreign key column is in a join table.
<li> If the join is for a OneToMany entity relationship using a foreign
key mapping strategy, the foreign key column for the map key is in the
table of the entity that is the value of the map.
</ul>
<p> Default:
<ul>
<li> If the map is for an element collection, the
name of the collection table for the map value.
<li> If the map is for a OneToMany or ManyToMany entity relationship
using a join table, the name of the join table for the map.
<li> If the map is for a OneToMany entity relationship using a
foreign key mapping strategy, the name of the primary table
of the entity that is the value of the map.
</ul></div>
<dl>
<dt>Default:</dt>
<dd>""</dd>
</dl>
</li>
</ul>
</li>
</ul>
<ul class="blockList">
<li class="blockList"><a name="foreignKey--">
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</a>
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<h4>foreignKey</h4>
<pre>public abstract&nbsp;<a href="../../jakarta/persistence/ForeignKey.html" title="annotation in jakarta.persistence">ForeignKey</a>&nbsp;foreignKey</pre>
<div class="block">(Optional) Used to specify or control the generation of a
foreign key constraint when table generation is in effect. If
this element is not specified, the persistence provider's
default foreign key strategy will apply.</div>
<dl>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.1</dd>
</dl>
<dl>
<dt>Default:</dt>
<dd>@jakarta.persistence.ForeignKey(jakarta.persistence.ConstraintMode.PROVIDER_DEFAULT)</dd>
</dl>
</li>
</ul>
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