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| <title>Many-to-one mapping</title> |
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| <meta name="doctitle" content="Many-to-one mapping" /> |
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| <p class="betadraftsubtitle">Beta Draft: 2013-01-03</p> |
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| <div class="sect2"><!-- infolevel="all" infotype="General" --> |
| <h1>Many-to-one mapping</h1> |
| <p><a id="sthref250" name="sthref250"></a><a id="sthref251" name="sthref251"></a><a id="sthref252" name="sthref252"></a><a id="sthref253" name="sthref253"></a>Use a <span class="bold">Many-to-One</span> mapping to defines a single-valued association to another entity class that has many-to-one 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 > Many-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="sthref254" name="sthref254"></a> |
| <p class="titleinfigure">JPA Details, Many-to-one mapping</p> |
| <img src="img/jpa_details_manytoone.png" alt="JPA Details, Many-to-one mapping" title="JPA Details, Many-to-one mapping" /><br /></div> |
| <!-- class="figure" --></li> |
| <li> |
| <p>Complete each field in the <a href="reference038.htm#CACIHGCE">Many-to-Many 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> |
| </li> |
| </ol> |
| <p>Eclipse adds the following annotations to the field:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @JoinTable(joinColumns=@JoinColumn(name="<span class="italic"><JOIN_COLUMN></span>"), |
| name = "<span class="italic"><JOIN_TABLE_NAME></span>") |
| @ManyToOne( |
| targetEntity=<span class="italic"><TARGET_ENTITY></span>, |
| fetch=<span class="italic"><FETCH_TYPE></span>, |
| =<span class="italic"><_TYPE></span> |
| ) |
| </pre> |
| <a id="sthref255" name="sthref255"></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="sthref256" name="sthref256"></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="sthref257" name="sthref257"></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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