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| <title>One-to-one mapping</title> |
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| <meta name="doctitle" content="One-to-one mapping" /> |
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| <div class="sect2"><!-- infolevel="all" infotype="General" --> |
| <h1>One-to-one mapping</h1> |
| <p><a id="sthref266" name="sthref266"></a><a id="sthref267" name="sthref267"></a><a id="sthref268" name="sthref268"></a><a id="sthref269" name="sthref269"></a>Use a <span class="bold">One-to-One Mapping</span> to define a relationship with one-to-many multiplicity.</p> |
| <ol> |
| <li> |
| <p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, select the field to map.</p> |
| </li> |
| <li> |
| <p>Right-click the field and then select <span class="bold">Map As > One-to-One</span>. The <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a> displays the properties for the selected.</p> |
| <div class="figure"><a id="sthref270" name="sthref270"></a> |
| <p class="titleinfigure">JPA Details, One-to-one Mapping</p> |
| <img src="img/jpa_details_onetoone.png" alt="JPA Details, One-to-one Mapping" title="JPA Details, One-to-one Mapping" /><br /></div> |
| <!-- class="figure" --></li> |
| <li> |
| <p>Complete each field in the <a href="reference041.htm#CACGGHDD">One-to-One Mapping</a> area.</p> |
| </li> |
| <li> |
| <p>Complete the remaining areas in the <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a>:</p> |
| <ul> |
| <li> |
| <p><a href="reference047.htm#CACIJEGI">Joining Strategy</a></p> |
| </li> |
| <li> |
| <p><a href="reference048.htm#CACGHHGB">Derived Identity</a></p> |
| </li> |
| </ul> |
| </li> |
| </ol> |
| <p>Eclipse adds the following annotations to the field:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @OneToOne(targetEntity=<span class="italic"><TARGET_ENTITY></span>, =Type.<span class="italic"><_TYPE></span>, |
| fetch = FetchType.<span class="italic"><FETCH_TYPE></span>, mappedBy = "<span class="italic"><MAPPED_BY></span>") |
| @JoinColumn(name="<span class="italic"><JOIN_COLUMN_NAME></span>", referencedColumnName= |
| "<span class="italic"><JOIN_COLUMN_REFERENCED_COLUMN></span>", insertable = <span class="italic"><INSERTABLE></span>, |
| updatable = <span class="italic"><UPDATABLE></span>) |
| </pre> |
| <a id="sthref271" name="sthref271"></a> |
| <p class="subhead2">Related tasks</p> |
| <ul> |
| <li> |
| <p><a href="task_mapping.htm#BABDGBIJ">Mapping an entity</a></p> |
| </li> |
| </ul> |
| <a id="sthref272" name="sthref272"></a> |
| <p class="subhead2">Related references</p> |
| <ul> |
| <li> |
| <p><a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a></p> |
| </li> |
| <li> |
| <p><a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a></p> |
| </li> |
| <li> |
| <p><a href="reference047.htm#CACIJEGI">Joining Strategy</a></p> |
| </li> |
| <li> |
| <p><a href="reference048.htm#CACGHHGB">Derived Identity</a></p> |
| </li> |
| </ul> |
| <a id="sthref273" name="sthref273"></a> |
| <p class="subhead2">Related concepts</p> |
| <ul> |
| <li> |
| <p><a href="concept_mapping.htm#BABBDJFI">Understanding OR mappings</a></p> |
| </li> |
| <li> |
| <p><a href="concepts001.htm#BABBGFJG">Understanding Java Persistence API</a></p> |
| </li> |
| </ul> |
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