1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii" />
<meta http-equiv="Content-Style-Type" content="text/css" />
<meta http-equiv="Content-Script-Type" content="text/javascript" />
<title>Generating entities from tables</title>
<meta name="generator" content="Oracle DARB XHTML Converter (Mode = ohj/ohw) - Version 5.1.1" />
<meta name="date" content="2010-05-19T8:12:45Z" />
<meta name="robots" content="noarchive" />
<meta name="doctitle" content="Generating entities from tables" />
<meta name="relnum" content="Release 2.3" />
<meta name="copyright" content="Copyright (c) 2000, 2008 oracle . All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html. Contributors: Oracle - initial API and implementation" />
<link rel="copyright" href="dcommon/html/cpyr.htm" title="Copyright" type="text/html" />
<link rel="stylesheet" href="dcommon/css/blafdoc.css" title="Oracle BLAFDoc" type="text/css" />
<!-- contents -->
</head>
<body>
<p><a id="BABBAGFI" name="BABBAGFI"></a></p>
<div class="sect1">
<h1>Generating entities from tables</h1>
<p><a id="sthref158" name="sthref158"></a><a id="sthref159" name="sthref159"></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="sthref160" name="sthref160"></a><a id="sthref161" name="sthref161"></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="sthref162" name="sthref162"></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>
<!-- class="figure" --></li>
<li>
<p>On the <a href="ref_selectTables.htm#CIAHCGEE">Select Tables</a> page, 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="sthref163" name="sthref163"></a>
<p class="titleinfigure">Select Tables</p>
<img src="img/select_tables.png" alt="" title="" /><br /></div>
<!-- class="figure" --></li>
<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</a> wizard to define the association.</p>
<div class="figure"><a id="sthref164" name="sthref164"></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="sthref165" name="sthref165"></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="sthref166" name="sthref166"></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" -->
<p> </p>
<img src="img/ngrelt.png" alt="Related task" title="Related task" /><br />
<p><a href="task_create_new_project.htm#CIHHEJCJ">Creating a new JPA project</a></p>
<p> </p>
<img src="img/ngrelr.png" alt="Related reference" title="Related reference" /><br />
<br />
<a href="ref_project_properties.htm#BABJHBCI">Project Properties page – Java Persistence Options</a></div>
<!-- class="sect1" -->
<!-- Start Footer -->
<div class="footer">
<table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%">
<col width="86%" />
<col width="*" />
<tr>
<td align="left"><span class="copyrightlogo">Copyright © 2006, 2010, Oracle and/or its affiliates. All rights reserved.</span><br />
<a href="dcommon/html/cpyr.htm"><span class="copyrightlogo">Legal Notices</span></a></td>
</tr>
</table>
</div>
<!-- class="footer" -->
</body>
</html>
|
