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| <div class="sect2"><!-- infolevel="all" infotype="General" --> |
| <h1>Creating a Java persistent entity</h1> |
| <p><a id="sthref10" name="sthref10"></a>This quick start shows how to create a new persistent Java entity. We will create an entity to associate with a database table. You will also need to add the ADDRESS table to your database.</p> |
| <ol start="1"> |
| <li> |
| <p>Right-click the project in the Package Explorer and select <span class="bold">New > Class</span>. The New Java Class page appears.</p> |
| </li> |
| <li> |
| <p>On the Java Class page, enter a package name (such as <code>quickstart.demo.model</code>), class name (such as <code>Address</code>), and click <span class="bold">Finish</span>.</p> |
| </li> |
| <li> |
| <p>Right-click the <code>Address.java</code> file in the Package Explorer and select <span class="bold">Open</span>.</p> |
| <div class="figure"><a id="sthref11" name="sthref11"></a> |
| <p class="titleinfigure">Open Address.java</p> |
| <img src="img/address_java_open.png" alt="Opening a Java class." title="Opening a Java class." /><br /></div> |
| <!-- class="figure" --></li> |
| <li> |
| <p>Select the <code>Address</code> entity in the JPA Structure view.</p> |
| <div class="figure"><a id="sthref12" name="sthref12"></a> |
| <p class="titleinfigure">Address Class in JPA Structure View</p> |
| <img src="img/address_jpa_structure.png" alt="Address class in JPA Structure view." title="Address class in JPA Structure view." /><br /></div> |
| <!-- class="figure" --></li> |
| <li> |
| <p>In the JPA Details view, in the Map As field, select <span class="bold">Entity</span>. In the Table field, select the <span class="bold">ADDRESS</span> database table.</p> |
| <div class="figure"><a id="sthref13" name="sthref13"></a> |
| <p class="titleinfigure">Address Entity in JPA Details View</p> |
| <img src="img/address_jpa_details.png" alt="JPA Details view." title="JPA Details view." /><br /></div> |
| <!-- class="figure" --></li> |
| </ol> |
| <p>Eclipse creates the persistent entity and adds the <code>@Entity</code> annotation to the class.</p> |
| <div class="figure"><a id="sthref14" name="sthref14"></a> |
| <p class="titleinfigure">Address Entity</p> |
| <img src="img/java_editor_address.png" alt="Java editor with the Address entity." title="Java editor with the Address entity." /><br /></div> |
| <!-- class="figure" --> |
| <p>Eclipse also displays the <span class="bold">Address</span> entity in the JPA Structure view:</p> |
| <div class="figure"><a id="sthref15" name="sthref15"></a> |
| <p class="titleinfigure">Address Entity</p> |
| <img src="img/persistence_outline_entity.png" alt="Address entity in the JPA Structure view." title="Address entity in the JPA Structure view." /><br /></div> |
| <!-- class="figure" --> |
| <p>After creating the entity, you must associate it with a database table.</p> |
| <ol start="1"> |
| <li> |
| <p>Select the <span class="gui-object-action">Address</span> class in the Explorer view.</p> |
| </li> |
| <li> |
| <p>In the <span class="gui-object-title">JPA Details</span> view, notice that Dali has automatically associated the ADDRESS database table with the entity because they are named identically.</p> |
| <div align="center"> |
| <div class="inftblnote"><br /> |
| <table class="Note oac_no_warn" summary="" cellpadding="3" cellspacing="0"> |
| <tbody> |
| <tr> |
| <td align="left"> |
| <p class="notep1">Note:</p> |
| Depending on your database connection type, you may need to specify the <span class="bold">Schema</span>.</td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="inftblnote" --></div> |
| <div class="figure"><a id="sthref16" name="sthref16"></a> |
| <p class="titleinfigure">JPA Details View for Address Entity</p> |
| <img src="img/persistence_view_address.png" alt="Address entity in the JPA Details view." title="Address entity in the JPA Details view." /><br /></div> |
| <!-- class="figure" --></li> |
| </ol> |
| <p>After associating the entity with the database table, you must update the <code>persistence.xml</code> file to include this JPA entity.</p> |
| <p>Right-click the <code>persistence.xml</code> file in the Package Explorer and select <span class="bold">JPA Tools > Synchronize Classes</span>. Dali adds the following to the <code>persistence.xml</code> file:</p> |
| <p><code><class>quickstart.demo.model.Address</class></code></p> |
| <p> </p> |
| <p>Now that you have created a persistent entity, you can continue with <a href="getting_started005.htm#BABHACAF">Mapping an entity</a> to map the entity's fields to columns on the database table.</p> |
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