| <!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> |
| <!-- Run date = May 21, 2007 6:35:52 --> |
| <meta name="OAC_IGNORE_SKIP_NAV" content="true" /> |
| <title>Mapping an entity</title> |
| <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" /> |
| <meta name="generator" content="Oracle DARB XHTML Converter - Version 4.5.3 Build 02" /> |
| <meta name="date" content="2005-07-10T12:57:20+08:00" /> |
| <meta name="robots" content="all" scheme="http://www.robotstxt.org/" /> |
| <meta name="doctitle" content="Mapping an entity" /> |
| <meta name="relnum" content="Release 1.0.0" /> |
| <meta name="partnum" content="" /> |
| <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" /> |
| <link rel="start" href="../../index.htm" title="Home" type="text/html" /> |
| <link rel="contents" href="toc.htm" title="Contents" type="text/html" /> |
| </head> |
| <body> |
| <p><a id="BABHACAF" name="BABHACAF"></a></p> |
| <div class="sect2"><!-- infolevel="all" infotype="General" --> |
| <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> |
| <tr valign="bottom"> |
| <td align="left" width="86%"> |
| <h1>Mapping an entity</h1> |
| </td> |
| </tr> |
| </table> |
| <p><a id="sthref17" name="sthref17"></a><a id="sthref18" name="sthref18"></a>This quick start shows how to map fields in a Java persistent entity. Before beginning, add the following fields to the Address class:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| private Long id; |
| private String city; |
| private String country; |
| private String stateOrProvince; |
| private String postalCode; |
| private String street; |
| |
| </pre> |
| <p>Eclipse updates the Address entity in the JPA Structure view to show its fields:</p> |
| <div class="figure"><a id="sthref19" name="sthref19"></a> |
| <p class="titleinfigure">Address Entity and Fields</p> |
| <img src="img/persistence_outline_fields.png" alt="Address entity and its fields in the JPA Structure view." title="Address entity and its fields in the JPA Structure view." /><br /></div> |
| <!-- class="figure" --> |
| <p>You will also need to add the following columns to the ADDRESS database table:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| NUMBER(10,0) ADDRESS_ID (primary key) |
| VARCHAR2(80) PROVINCE |
| VARCHAR2(80) COUNTRY |
| VARCHAR2(20) P_CODE |
| VARCHAR2(80) STREET |
| VARCHAR2(80) CITY |
| </pre> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| </pre> |
| <p>Now we are ready to map each fields in the Address class to a column in the database table.</p> |
| <ol type="1" start="1"> |
| <li> |
| <p>Select the <span class="gui-object-action">id</span> field in the JPA Details view.</p> |
| </li> |
| <li> |
| <p>In the JPA Details view:</p> |
| <ul> |
| <li type="disc"> |
| <p>For the Map As field, select <span class="bold">Id</span></p> |
| </li> |
| <li type="disc"> |
| <p>For the Column field, select <span class="bold">ADDRESS_ID</span>.</p> |
| </li> |
| </ul> |
| <div class="figure"><a id="sthref20" name="sthref20"></a> |
| <p class="titleinfigure">JPA Details View for addressId Field</p> |
| <img src="img/persistence_view_addressid.png" alt="JPA Details view for the id field." title="JPA Details view for the id field." /><br /></div> |
| <!-- class="figure" --> |
| <p>Eclipse adds the following annotations to the Address entity:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Id |
| @Column(name="ADDRESS_ID") |
| |
| </pre></li> |
| <li> |
| <p>Map each of the following fields (as <span class="bold">Basic</span> mappings) to the appropriate database column:</p> |
| <div class="inftblhruleinformal"> |
| <table class="HRuleInformal" title="This table describes the mappings for each of the fields in the Address entity." summary="This table describes the mappings for each of the fields in the Address entity." dir="ltr" border="1" width="100%" frame="border" rules="all" cellpadding="3" cellspacing="0"> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t4">Field</th> |
| <th align="left" valign="bottom" id="r1c2-t4">Map As</th> |
| <th align="left" valign="bottom" id="r1c3-t4">Database Column</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t4" headers="r1c1-t4">city</td> |
| <td align="left" headers="r2c1-t4 r1c2-t4">Basic</td> |
| <td align="left" headers="r2c1-t4 r1c3-t4">CITY</td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t4" headers="r1c1-t4">country</td> |
| <td align="left" headers="r3c1-t4 r1c2-t4">Basic</td> |
| <td align="left" headers="r3c1-t4 r1c3-t4">COUNTRY</td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r4c1-t4" headers="r1c1-t4">postalCode</td> |
| <td align="left" headers="r4c1-t4 r1c2-t4">Basic</td> |
| <td align="left" headers="r4c1-t4 r1c3-t4">P_CODE</td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r5c1-t4" headers="r1c1-t4">provinceOrState</td> |
| <td align="left" headers="r5c1-t4 r1c2-t4">Basic</td> |
| <td align="left" headers="r5c1-t4 r1c3-t4">PROVINCE</td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r6c1-t4" headers="r1c1-t4">street</td> |
| <td align="left" headers="r6c1-t4 r1c2-t4">Basic</td> |
| <td align="left" headers="r6c1-t4 r1c3-t4">STREET</td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="inftblhruleinformal" --></li> |
| </ol> |
| <p>Notice that Dali will automatically map some fields to the correct database column (such as the <span class="bold">city</span> field to the CITY column) if the names are identical.</p> |
| <p>Refer to the <a href="getting_started006.htm#BABCDECJ">Dali basic tutorial</a> to map a complete object model using basic and relational mappings.</p> |
| </div> |
| <!-- class="sect2" --> |
| <!-- class="sect1" --> |
| <!-- Start Footer --> |
| <div class="footer"> |
| <table class="simple oac_no_warn" summary="" cellspacing="0" cellpadding="0" width="100%"> |
| <tr> |
| <td align="left" width="86%"><a href="dcommon/html/cpyr.htm"><span class="copyrightlogo">Copyright © 2006, 2007, Oracle. All rights reserved.</span></a></td> |
| </tr> |
| </table> |
| </div> |
| <!-- class="footer" --> |
| </body> |
| </html> |
