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<title>Generating entities from tables</title>
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<p class="betadraftsubtitle">Beta Draft: 2012-10-11</p>
<p><a id="BABBAGFI" name="BABBAGFI"></a></p>
<div class="sect1">
<h1>Generating entities from tables</h1>
<p><a id="sthref290" name="sthref290"></a><a id="sthref291" name="sthref291"></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.<a id="sthref292" name="sthref292"></a><a id="sthref293" name="sthref293"></a></p>
<p>To use the <a href="reference018.htm#CIAGHCGA">Generate Tables from Entities wizard</a>:</p>
<ol>
<li>
<p>Right-click the JPA project in the <span class="gui-object-title">Project Explorer</span> and select <span class="gui-object-action">JPA Tools > Generate Entities from Tables</span>.</p>
<div class="figure"><a id="sthref294" name="sthref294"></a>
<p class="titleinfigure">Generating Entities from Tables</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>
<!-- class="figure" --></li>
<li>
<p>On the <a href="ref_selectTables.htm#CIAHCGEE">Select Tables</a> page of the <a href="ref_create_custom_entities_wizard.htm#CIAGBFJE">Generate Entities from Tables wizard</a>, select your database connection and schema.</p>
<p>To create a new database connection, click <span class="bold">Add connection</span>.</p>
<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>
<div class="figure"><a id="sthref295" name="sthref295"></a>
<p class="titleinfigure">Select Tables</p>
<img src="img/select_tables.png" alt="" title="" /><br /></div>
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<li>
<p>After selecting a schema, select the tables from which to generate Java persistent entities and click <span class="bold">Next</span>.</p>
</li>
<li>
<p>On the <a href="ref_tableAssociations.htm#CIACDICB">Table Associations</a> page, select the associations to generate. You can specify to generate specific references for each association.</p>
<p>To create a new association, click <span class="bold">Add Association</span>. Use the <a href="ref_create_new_association_wizard.htm#CIAFGHIF">Create New Association wizard</a> wizard to define the association.</p>
<div class="figure"><a id="sthref296" name="sthref296"></a>
<p class="titleinfigure">Table Associations</p>
<img src="img/table_associations.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>After editing the table associations, click <span class="bold">Next</span>.</p>
</li>
<li>
<p>On the <a href="ref_customizeDefaultEntityGeneration.htm#CIAEJDBE">Customize Default Entity Generation</a> page, customize the mapping and class information for each generated entity.</p>
<div class="figure"><a id="sthref297" name="sthref297"></a>
<p class="titleinfigure">Customize Default Entity Generation</p>
<img src="img/customize_default_entity_generation.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>After customizing the mappings, click <span class="bold">Next</span>.</p>
</li>
<li>
<p>On the <a href="ref_customizIndividualEntities.htm#CIACIGEE">Customize Individual Entities</a> page, review the mapping and class information for each entity that will be generated, then click <span class="bold">Finish</span>.</p>
<div class="figure"><a id="sthref298" name="sthref298"></a>
<p class="titleinfigure">Customize Individual Entities</p>
<img src="img/customize_individual_entities.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
</ol>
<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>
<div class="figure"><a id="CIHJIJJC" name="CIHJIJJC"></a>
<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>
<!-- class="figure" -->
<a id="sthref299" name="sthref299"></a>
<p class="subhead2">Related tasks</p>
<ul>
<li>
<p><a href="task_create_new_project.htm#CIHHEJCJ">Creating a new JPA project</a></p>
</li>
</ul>
<a id="sthref300" name="sthref300"></a>
<p class="subhead2">Related reference</p>
<ul>
<li>
<p><a href="reference066.htm#CACDCIGD">Project Properties page – Entity Generation</a></p>
</li>
</ul>
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