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<div class="subTitle">jakarta.persistence</div>
<h2 title="Annotation Type JoinColumn" class="title">Annotation Type JoinColumn</h2>
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<pre>@Repeatable(value=<a href="../../jakarta/persistence/JoinColumns.html" title="annotation in jakarta.persistence">JoinColumns.class</a>)
@Target(value={METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface <span class="memberNameLabel">JoinColumn</span></pre>
<div class="block">Specifies a column for joining an entity association or element
collection. If the <code>JoinColumn</code> annotation itself is
defaulted, a single join column is assumed and the default values
apply.
<pre>
Example:
&#064;ManyToOne
&#064;JoinColumn(name="ADDR_ID")
public Address getAddress() { return address; }
Example: unidirectional one-to-many association using a foreign key mapping
// In Customer class
&#064;OneToMany
&#064;JoinColumn(name="CUST_ID") // join column is in table for Order
public Set&#060;Order&#062; getOrders() {return orders;}
</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/ManyToOne.html" title="annotation in jakarta.persistence"><code>ManyToOne</code></a>,
<a href="../../jakarta/persistence/OneToMany.html" title="annotation in jakarta.persistence"><code>OneToMany</code></a>,
<a href="../../jakarta/persistence/OneToOne.html" title="annotation in jakarta.persistence"><code>OneToOne</code></a>,
<a href="../../jakarta/persistence/JoinTable.html" title="annotation in jakarta.persistence"><code>JoinTable</code></a>,
<a href="../../jakarta/persistence/CollectionTable.html" title="annotation in jakarta.persistence"><code>CollectionTable</code></a>,
<a href="../../jakarta/persistence/ForeignKey.html" title="annotation in jakarta.persistence"><code>ForeignKey</code></a></dd>
</dl>
</li>
</ul>
</div>
<div class="summary">
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<li class="blockList">
<!-- =========== 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">&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/JoinColumn.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/JoinColumn.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/JoinColumn.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/JoinColumn.html#name--">name</a></span></code>
<div class="block">(Optional) The name of the foreign key column.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../jakarta/persistence/JoinColumn.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/JoinColumn.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/JoinColumn.html#table--">table</a></span></code>
<div class="block">(Optional) The name of the table that contains
the 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/JoinColumn.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/JoinColumn.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>
</div>
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<h3>Element Detail</h3>
<a name="name--">
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<h4>name</h4>
<pre>public abstract&nbsp;java.lang.String&nbsp;name</pre>
<div class="block">(Optional) The name of the foreign key column.
The table in which it is found depends upon the
context.
<ul>
<li>If the join is for a OneToOne or ManyToOne
mapping using a foreign key mapping strategy,
the foreign key column is in the table of the
source entity or embeddable.
<li> If the join is for a unidirectional OneToMany mapping
using a foreign key mapping strategy, the foreign key is in the
table of the target entity.
<li> If the join is for a ManyToMany mapping or for a OneToOne
or bidirectional ManyToOne/OneToMany mapping using a join
table, the foreign key is in a join table.
<li> If the join is for an element collection, the foreign
key is in a collection table.
</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; "_"; the name of the referenced
primary key column.
If there is no such referencing relationship property or
field in the entity, or if the join is for an element collection,
the join column name is formed as the
concatenation of the following: the name of the entity; "_";
the name of the referenced primary key column.</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>
<ul class="blockList">
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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.
<ul>
<li> When used with entity relationship mappings other
than the cases described here, the referenced column is in the
table of the target entity.
<li> When used with a unidirectional OneToMany foreign key
mapping, the referenced column is in the table of the source
entity.
<li> When used inside a <code>JoinTable</code> annotation,
the referenced key column is in the entity table of the owning
entity, or inverse entity if the join is part of the inverse
join definition.
<li> When used in a <code>CollectionTable</code> mapping, the
referenced column is in the table of the entity containing the
collection.
</ul>
<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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<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. It is not necessary to
explicitly specify this for a join column that corresponds to a
primary key that is part of a foreign key.</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>true</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">
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<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>
<ul class="blockList">
<li class="blockList">
<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.
<p> Defaults to the generated SQL for the column.</div>
<dl>
<dt>Default:</dt>
<dd>""</dd>
</dl>
</li>
</ul>
</li>
</ul>
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<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 column. If a table is not specified, the column
is assumed to be in the primary table of the
applicable entity.
<p> Default:
<ul>
<li> If the join is for a OneToOne or ManyToOne mapping
using a foreign key mapping strategy, the name of the table of
the source entity or embeddable.
<li> If the join is for a unidirectional OneToMany mapping
using a foreign key mapping strategy, the name of the table of
the target entity.
<li> If the join is for a ManyToMany mapping or
for a OneToOne or bidirectional ManyToOne/OneToMany mapping
using a join table, the name of the join table.
<li> If the join is for an element collection, the name of the collection table.
</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>
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