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<h1>Mapping an entity</h1>
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<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>
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<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">
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<p>Now we are ready to map each fields in the Address class to a column in the database table.</p>
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<p>Select the <span class="gui-object-action">id</span> field in the JPA Details view.</p>
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<p>In the JPA Details view:</p>
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<li type="disc">
<p>For the Map As field, select <span class="bold">Id</span></p>
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<p>For the Column field, select <span class="bold">ADDRESS_ID</span>.</p>
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<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>
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<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">
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<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>
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<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>
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<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>
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<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>
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<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>
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<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>
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<br /></div>
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<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>
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