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EclipseLink/Examples/MOXy/JPA
Contents
Overview
This example demonstrates how to derive an XML representation from a set of JPA entities using JAXB.
JPA Entities
For this example the following JPA entities will be used. In order to save space package names, import statements, and the get /set methods have been omitted from the following code samples. All annotations shown below are standard JPA annotations.
@Entity public class Department { @Id @Column(name="D_ID") private BigDecimal dId; private String name; @ManyToMany @JoinTable(name="DEPT_EMP", joinColumns = @JoinColumn(name="D_ID", referencedColumnName = "D_ID"), inverseJoinColumns = @JoinColumn(name="E_ID", referencedColumnName = "E_ID")) private List<Employee> member; }
@Entity public class Employee { @Id @Column(name="E_ID") private BigDecimal eId; private String name; @OneToOne(mappedBy="resident") private Address residence; @OneToMany(mappedBy="contact") private List<PhoneNumber> contactNumber; @ManyToMany(mappedBy="member") private List<Department> team; }
@Entity public class Address { @Id @Column(name="E_ID", insertable=false, updatable=false) private BigDecimal eId; private String city; private String street; @OneToOne @JoinColumn(name="E_ID") private Employee resident; }
@Entity @Table(name="PHONE_NUMBER") public class PhoneNumber { @Id @Column(name="P_ID") private BigDecimal pId; @ManyToOne @JoinColumn(name="E_ID", referencedColumnName = "E_ID") private Employee contact; private String num; }
JAXB Binding
Relationship – One To One (Containment)
This relationship applies when an object privately owns another data object.
Relationship – One To One (Non-Containment)
This relationship applies when an object references but does not privately own another data object.
Relationship – One To Many (Containment)
This relationship applies when an object privately owns a collection of data objects.
Relationship – One To Many (Non-Containment)
This relationship applies when an object references but does not privately own a collection of data objects.