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| <b>Release 2.7</b><br /></font></td> |
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| <div class="sect1"><!-- infolevel="all" infotype="General" --> |
| <h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Mapping Privately Owned One-to-Many Relationships</font></h1> |
| <p>This section illustrates how to map one-to-many relationships with EclipseLink.</p> |
| <p>The schema in <a href="#BABJAAGI">Example 6-8</a> a typical one-to-many (1:M) relationship between Customer and PhoneNumber, as shown in <a href="#BABGDJID">Figure 6-2</a>.</p> |
| <div class="example"><a id="BABJAAGI" name="BABJAAGI"></a><a id="TLJAX336" name="TLJAX336"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 6-8 Sample XML Mapping</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <?xml version="1.0" encoding="UTF-8"?> |
| <xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema"> |
| |
| <xsd:element name="customer" type="customer-type"/> |
| |
| <xsd:complexType name="customer-type"> |
| <xsd:sequence> |
| <xsd:element name="first-name" type="xsd:string"/> |
| <xsd:element name="last-name" type="xsd:string"/> |
| <xsd:element name="phone-number" type="phone-type" minOccurs="0" maxOccurs="unbounded"/> |
| </xsd:sequence> |
| </xsd:complexType> |
| |
| <xsd:complexType name="phone-type"> |
| <xsd:sequence> |
| <xsd:attribute name="type" type="xsd:string"/> |
| <xsd:element name="number" type="xsd:int"/> |
| </xsd:sequence> |
| </xsd:complexType> |
| |
| </xsd:schema> |
| |
| </pre></div> |
| <!-- class="example" --> |
| <div class="figure"><a id="BABGDJID" name="BABGDJID"></a><a id="TLJAX337" name="TLJAX337"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Figure 6-2 One-to-many Relationship</font></em></strong></p> |
| <img src="img/ccxm.gif" alt="Description of Figure 6-2 follows" title="Description of Figure 6-2 follows" longdesc="img_text/ccxm.htm" /><br /> |
| <a id="sthref124" name="sthref124" href="img_text/ccxm.htm">Description of "Figure 6-2 One-to-many Relationship"</a><br /> |
| <br /></div> |
| <!-- class="figure" --> |
| <a id="TLJAX338" name="TLJAX338"></a> |
| <div class="sect2"><a id="sthref125" name="sthref125"></a> |
| <h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Mapping to Elements</font></h2> |
| <p><a href="#BABECFHA">Example 6-9</a> shows how to annotate your Java class to obtain this mapping with EclipseLink. The standard JAXB <code>@XmlElement</code> annotation, when used on a Collection or array field, can achieve this.</p> |
| <div class="example"><a id="BABECFHA" name="BABECFHA"></a><a id="TLJAX339" name="TLJAX339"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 6-9 Using the @XmlElement Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| package example; |
| |
| import javax.xml.bind.annotation.*; |
| |
| @XmlRootElement |
| @XmlAccessorType(XmlAccessType.FIELD) |
| public class Customer { |
| @XmlElement(name="first-name") |
| private String firstName; |
| @XmlElement(name="last-name") |
| private String lastName; |
| <strong>@XmlElement</strong>(name="phone-number") |
| private List<PhoneNumber> phoneNumbers; |
| |
| ... |
| } |
| |
| package example; |
| |
| import javax.xml.bind.annotation.*; |
| import org.eclipse.persistence.oxm.annotations.*; |
| |
| @XmlAccessorType(XmlAccessType.FIELD) |
| public class PhoneNumber { |
| @XmlAttribute |
| private String type; |
| private Integer number; |
| |
| ... |
| } |
| |
| </pre></div> |
| <!-- class="example" --> |
| <p><a href="#BABGEFHC">Example 6-10</a> shows how to define your mapping information in EclipseLink's OXM metadata format.</p> |
| <div class="example"><a id="BABGEFHC" name="BABGEFHC"></a><a id="TLJAX340" name="TLJAX340"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 6-10 Sample XML Mapping</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| ... |
| <java-type name="Customer"> |
| <xml-root-element name="customer"/> |
| <java-attributes> |
| <xml-element java-attribute="firstName" name="first-name" type="java.lang.String"/> |
| <xml-element java-attribute="lastName" name="last-name" type="java.lang.String"/> |
| <xml-element java-attribute="phoneNumbers" name="phone-number" type="PhoneNumber" container-type="java.util.ArrayList"/> |
| </java-attributes> |
| </java-type> |
| |
| <java-type name="PhoneNumber"> |
| <java-attributes> |
| <xml-attribute java-attribute="type" type="java.lang.String"/> |
| <xml-value java-attribute="number" type="java.lang.Integer"/> |
| </java-attributes> |
| </java-type> |
| ... |
| |
| </pre></div> |
| <!-- class="example" --></div> |
| <!-- class="sect2" --> |
| <a id="TLJAX341" name="TLJAX341"></a> |
| <div class="sect2"><a id="sthref126" name="sthref126"></a> |
| <h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">Grouping Elements using the @XmlElementWrapper Annotation</font></h2> |
| <p>To make the elements of the Collection appear inside a grouping element, you can use <code>@XmlElementWrapper</code>:</p> |
| <div class="example"><a id="TLJAX342" name="TLJAX342"></a><a id="sthref127" name="sthref127"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 6-11 Using the @XmlElementWrapper Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| package example; |
| |
| import javax.xml.bind.annotation.*; |
| |
| @XmlRootElement |
| @XmlAccessorType(XmlAccessType.FIELD) |
| public class Customer { |
| @XmlElement(name = "phone-number") |
| <strong>@XmlElementWrapper</strong>(name="phone-numbers") |
| private List<PhoneNumber> phoneNumbers; |
| |
| ... |
| } |
| |
| </pre></div> |
| <!-- class="example" --> |
| <p>This will produce the following XML:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <customer> |
| <first-name>Bob</first-name> |
| <last-name>Smith</last-name> |
| <phone-numbers> |
| <phone-number type="Home"> |
| <number>5559827222</number> |
| </phone-number> |
| <phone-number type="Work"> |
| <number>5558872216</number> |
| </phone-number> |
| </phone-numbers> |
| </customer> |
| </pre></div> |
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