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

Line 22: Line 22:
  
 
   <xsd:complexType name="phone-type">
 
   <xsd:complexType name="phone-type">
       <xsd:element name="area-code" type="xsd:int"/>
+
       <xsd:element name="type" type="xsd:string"/>
 
       <xsd:element name="number" type="xsd:int"/>
 
       <xsd:element name="number" type="xsd:int"/>
      <xsd:element name="extension" type="xsd:int"/>
 
 
   </xsd:complexType>
 
   </xsd:complexType>
  

Revision as of 13:38, 10 March 2011


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One-to-Many Mapping

This section illustrates how to map one-to-many relationships with Eclipselink.

The schema below shows a typical 1:M relationship between Customer and PhoneNumber

<?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:element name="phone-numbers" type="phone-type" minOccurs="0" maxOccurs="unbounded"/>
   </xsd:complexType>
 
   <xsd:complexType name="phone-type">
      <xsd:element name="type" type="xsd:string"/>
      <xsd:element name="number" type="xsd:int"/>
   </xsd:complexType>
 
</xsd:schema>

XML Composite Collection Mapping


With Java

Java for XML Composite Collection Mapping for a Collection Attribute
 XMLCompositeCollectionMapping phoneNumbersMapping = new XMLCompositeCollectionMapping();
 phoneNumbersMapping.setAttributeName("phoneNumbers");
 phoneNumbersMapping.setXPath("phone-number");
 phoneNumbersMapping.setReferenceClass(PhoneNumber.class);
Java for XML Composite Collection Mapping for a Map Attribute
 XMLCompositeCollectionMapping phoneNumbersMapping = new XMLCompositeCollectionMapping();
 phoneNumbersMapping.setAttributeName("phoneNumbers");           
 phoneNumbersMapping.setXPath("phone-number");
 phoneNumbersMapping.setReferenceClass(PhoneNumber.class);
 phoneNumbersMapping.useMapClass(HashMap.class, "getType");

With EclipseLink Annotations

Use the @OneToMany annotation:

@Entity
public class Employee {
 
    @OneToMany(mappedBy="contact")
    private List<PhoneNumber> contactNumber;
 
}

Use the EclipseLink extension @XmlInverseReference to map the back-pointer:

@Entity
public class PhoneNumber {
 
    @ManyToOne
    @JoinColumn(name="E_ID", referencedColumnName = "E_ID")
    @XmlInverseReference(mappedBy="contactNumber")
    private Employee contact;
 
}

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