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Difference between revisions of "EclipseLink/UserGuide/MOXy/Relationships/Privately Owned/One-to-Many"

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{{EclipseLink_UserGuide
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See http://www.eclipse.org/eclipselink/documentation/2.4/moxy/privately_owned_relationships002.htm
|info=y
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|exampes=y
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|example=* [[EclipseLink/Examples/MOXy/JPA/Relationships#One_To_Many|One-to-many]]
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}}
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= One-to-Many Mapping =
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This section illustrates how to map one-to-many relationships with Eclipselink.
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The schema below shows a typical 1:M relationship between '''Customer''' and '''PhoneNumber'''
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<source lang="xml">
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<?xml version="1.0" encoding="UTF-8"?>
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<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
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  <xsd:element name="customer" type="customer-type"/>
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  <xsd:complexType name="customer-type">
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      <xsd:sequence>
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        <xsd:element name="first-name" type="xsd:string"/>
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        <xsd:element name="last-name" type="xsd:string"/>
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        <xsd:element name="phone-number" type="phone-type" minOccurs="0" maxOccurs="unbounded"/>
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      </xsd:sequence>
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  </xsd:complexType>
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  <xsd:complexType name="phone-type">
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      <xsd:sequence>
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        <xsd:attribute name="type" type="xsd:string"/>
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        <xsd:element name="number" type="xsd:int"/>
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      </xsd:sequence>
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  </xsd:complexType>
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</xsd:schema>
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</source>
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[[Image:Ccxm.gif|XML Composite Collection Mapping]]<br><br>
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The following example shows how to annotate your Java class to obtain this mapping with EclipseLink.  The standard JAXB '''@XmlElement''' annotation can be used to indicate that the associated Java field should be mapped to an XML element. 
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{{tip||By default, JAXB will assume all fields on your Java object are '''@XmlElement'''s, so in many cases the annotation itself is not required.  If, however, you want to customize the Java field's XML name, you can specify an '''@XmlElement''' annotation with a '''name''' argument.}}
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<source lang="java">
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@XmlRootElement
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@XmlAccessorType(XmlAccessType.FIELD)
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public class Customer {
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  @XmlElement(name="phone-number")
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  private PhoneNumber phoneNumber;
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  ...
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}
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@XmlAccessorType(XmlAccessType.FIELD)
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public class PhoneNumber {
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  private String type;
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  private Integer number;
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  ...
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}
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</source>
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The following example shows how to define your mapping information in EclipseLink's OXM metadata format.
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<source lang="xml">
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...
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<java-type name="Customer">
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  <xml-root-element name="customer"/>
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  <java-attributes>
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      <xml-element java-attribute="firstName" name="phone-number" type="java.lang.String"/>
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      <xml-element java-attribute="lastName" name="phone-number" type="java.lang.String"/>
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      <xml-element java-attribute="phoneNumbers" name="phone-number" type="PhoneNumber"/>
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  </java-attributes>
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</java-type>
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<java-type name="PhoneNumber">
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  <java-attributes>
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      <xml-value java-attribute="type" type="java.lang.String"/>
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      <xml-value java-attribute="number" type="java.lang.Integer"/>
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  </java-attributes>
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</java-type>
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...
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</source>
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{{EclipseLink_MOXy
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|version=2.2.0 DRAFT
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|previous=[[EclipseLink/UserGuide/MOXy/Relationships/Privately_Owned/One-to-One|One-to-one]]
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|next=[[EclipseLink/UserGuide/MOXy/Relationships/Shared_Reference|Shared references]]
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|up=[[EclipseLink/UserGuide/MOXy/Relationships/Privately Owned|Privately owned]]
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}}
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Latest revision as of 10:22, 8 November 2012

See http://www.eclipse.org/eclipselink/documentation/2.4/moxy/privately_owned_relationships002.htm