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| <h1>Generating entities from tables</h1> |
| <p><a id="sthref141" name="sthref141"></a><a id="sthref142" name="sthref142"></a>Use this procedure to generate Java persistent entities from database tables. You must create a JPA project and establish a database connection <span class="italic">before</span> generating persistent entities. See <a href="task_create_new_project.htm#CIHHEJCJ">"Creating a new JPA project"</a> for more information.</p> |
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| <p>Right-click the JPA project in the <span class="gui-object-title">Package Explorer</span> and select <span class="gui-object-action">JPA Tools > Generate Entities</span>.</p> |
| <div class="figure"><a id="sthref143" name="sthref143"></a> |
| <p class="titleinfigure">Generating Entities</p> |
| <img src="img/generate_entities.png" alt="Using the JPA Tools > Generate Entities menu option." title="Using the JPA Tools > Generate Entities menu option." /><br /></div> |
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| <p>If you are not currently connected to the database, the Database Connection page appears. Select your database connection and schema, and click <span class="bold">Reconnect</span>.</p> |
| <p>To create a new database connection, click <span class="bold">Add connection</span>.</p> |
| <p>After connecting to the database, click <span class="bold">Next</span>.</p> |
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| <p><a id="sthref144" name="sthref144"></a><a id="sthref145" name="sthref145"></a>On the <a href="task_generate_entities.htm#CACDAFJD">Generate Entities from Tables dialog</a> dialog, select the tables from which to generate Java persistent entities and click <span class="bold">Finish</span>.</p> |
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| <p>Eclipse creates a Java persistent entity for each database table. Each entity contains fields based on the table's columns. Eclipse will also generate entity relationships (such as one-to-one) based on the table constraints. <a href="#CIHJIJJC">Figure: Generating Entities from Tables</a> illustrates how Eclipse generates entities from tables.</p> |
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| <p class="titleinfigure">Generating Entities from Tables</p> |
| <img src="img/table_entity.png" alt="This figure shows the EMPLOYEE and ADDRESS entities generated from database tables." title="This figure shows the EMPLOYEE and ADDRESS entities generated from database tables." /><br /></div> |
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| <p><a href="task_create_new_project.htm#CIHHEJCJ">Creating a new JPA project</a></p> |
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| <a href="ref_project_properties.htm#BABJHBCI">Project Properties page – JPA Options</a></div> |
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