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| − | {{EclipseLink_UserGuide
| + | '''[[Image:Elug_draft_icon.png|Warning]] This page is obsolete. Please see ''[http://www.eclipse.org/eclipselink/documentation/ Developing JAXB Applications Using EclipseLink MOXy]'' for current information.''' |
| − | |info=y
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| − | |toc=n
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| − | |eclipselink=y
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| − | |eclipselinktype=MOXy
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| − | }}
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| − | | + | |
| − | =Keys and Foreign Keys=
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| − | This example demonstrates how to derive an XML representation from a set of JPA entities using JAXB when a JPA entity has compound primary keys.
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| − | | + | |
| − | == JPA Entities ==
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| − | | + | |
| − | <source lang="java">
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| − | @Entity
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| − | public class PhoneNumber {
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| − | | + | |
| − | @ManyToOne
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| − | @JoinColumns({
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| − | @JoinColumn(name="E_ID", referencedColumnName = "E_ID"),
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| − | @JoinColumn(name="E_COUNTRY", referencedColumnName = "COUNTRY")
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| − | })
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| − | | + | |
| − | private Employee contact;
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| − | | + | |
| − | }
| + | |
| − | </source>
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| − | | + | |
| − | <source lang="java">
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| − | @Entity
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| − | @IdClass(EmployeeId.class)
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| − | public class Employee {
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| − | | + | |
| − | @Id
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| − | @Column(name="E_ID")
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| − | private BigDecimal eId;
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| − | | + | |
| − | @Id
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| − | private String country;
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| − | | + | |
| − | @OneToMany(mappedBy="contact")
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| − | private List<PhoneNumber> contactNumber;
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| − | | + | |
| − | }
| + | |
| − | </source>
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| − | | + | |
| − | <source lang="java">
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| − | public class EmployeeId {
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| − | | + | |
| − | private BigDecimal eId;
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| − | private String country;
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| − | | + | |
| − | }
| + | |
| − | </source>
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| − | | + | |
| − | == JAXB Bindings ==
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| − | | + | |
| − | In this example, the XML acessor type will be set to '''FIELD''' for all the model classes. This can be set as a package level JAXB annotation.
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| − | | + | |
| − | <source lang="java">
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| − | @XmlAccessorType(XmlAccessType.FIELD)
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| − | package com.example.model;
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| − | | + | |
| − | import javax.xml.bind.annotation.XmlAccessType;
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| − | import javax.xml.bind.annotation.XmlAccessorType;
| + | |
| − | </source>
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| − | | + | |
| − | === Target Object ===
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| − | Because this example requires support beyond the JAXB specification, you can use the EclipseLink extension '''@XmlKey'''. Because the relationship is bidirectional, use the EclipseLink extension '''@XmlInverseReference'''.
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| − | | + | |
| − | <source lang="java">
| + | |
| − | @Entity
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| − | @IdClass(EmployeeId.class)
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| − | public class Employee {
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| − | | + | |
| − | @Id
| + | |
| − | @Column(name="E_ID")
| + | |
| − | @XmlID
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| − | private BigDecimal eId;
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| − | | + | |
| − | @Id
| + | |
| − | @XmlKey
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| − | private String country;
| + | |
| − | | + | |
| − | @OneToMany(mappedBy="contact")
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| − | @XmlInverseReference(mappedBy="contact")
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| − | private List<PhoneNumber> contactNumber;
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| − | | + | |
| − | }
| + | |
| − | </source>
| + | |
| − | | + | |
| − | === Source Object ===
| + | |
| − | Because the target object has a compound key, use the EclipseLink extension '''@XmlJoinNodes''' to set up the mapping.
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| − | | + | |
| − | '''Note''': If the target object had a ''single'' ID, then you could use '''@XmlIDREF'''.
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| − | | + | |
| − | <source lang="java">
| + | |
| − | @Entity
| + | |
| − | public class PhoneNumber {
| + | |
| − | | + | |
| − | @ManyToOne
| + | |
| − | @JoinColumns({
| + | |
| − | @JoinColumn(name="E_ID", referencedColumnName = "E_ID"),
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| − | @JoinColumn(name="E_COUNTRY", referencedColumnName = "COUNTRY")
| + | |
| − | })
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| − | @XmlJoinNodes( {
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| − | @XmlJoinNode(xmlPath="contact/id/text()", referencedXmlPath="id/text()"),
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| − | @XmlJoinNode(xmlPath="contact/country/text()", referencedXmlPath="country/text()")
| + | |
| − | })
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| − | private Employee contact;
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| − | | + | |
| − | }
| + | |
| − | </source>
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| − | | + | |
| − | | + | |
| − | {{EclipseLink_MOXy
| + | |
| − | |previous= [[EclipseLink/UserGuide/MOXy/Mapping_JPA_Entities_to_XML/Bidirectional_Relationships|Bidirectional Relationships]]
| + | |
| − | |up= [[EclipseLink/UserGuide/MOXy/Mapping_JPA_Entities_to_XML|Mapping JPA Entities to XML]]
| + | |
| − | |next= [[EclipseLink/UserGuide/MOXy/Web_Services|Web Services]]
| + | |
| − | |version=2.2.0 }}
| + | |
This page is obsolete. Please see Developing JAXB Applications Using EclipseLink MOXy for current information.