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| − | {{EclipseLink_UserGuide
| + | Please see http://www.eclipse.org/eclipselink/documentation/2.4/moxy/privately_owned_relationships001.htm |
| − | |info=y
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| − | |examples=y
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| − | |example=* [[EclipseLink/Examples/MOXy/JPA/Relationships#One_To_One_and_Embedded|One-to-one]]
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| − | }}
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| − | =Mapping One-to-One Relationships=
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| − | This section demonstrates several ways to map a one-to-one relationship between objects.
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| − | | + | |
| − | ==Mapping to an Attribute==
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| − | Given the XML schema in this example, the figure below illustrates an XML direct mapping to an attribute in a corresponding XML document.
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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:attribute name="id" type="xsd:integer"/>
| + | |
| − | </xsd:complexType>
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| − | | + | |
| − | </xsd:schema>
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| − | </source>
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| − | [[Image:dxmatt.gif|XML Direct Mapping to an Attribute]]<br><br>
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| − | The following example shows how to annotate your Java class to obtain this mapping with EclipseLink. All that is needed is the standard JAXB <tt>@XmlAttribute</tt> annotation.
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| − | <source lang="java">
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| − | @XmlRootElement
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| − | public class Customer {
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| − | @XmlAttribute
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| − | public Integer id;
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| − | }
| + | |
| − | </source>
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| − | The example below shows how to to define your mapping information in EclipseLink's OXM metadata format.
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| − | | + | |
| − | <source lang="xml">
| + | |
| − | ...
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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-attribute java-attribute="id"/>
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| − | </java-attributes>
| + | |
| − | </java-type>
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| − | ...
| + | |
| − | </source>
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| − | <br><br>
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| − | = One-to-One Composite Collection Mapping =
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| − | == With EclipseLink Annotations ==
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| − | Use the '''@OneToOne''' annotation:
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| − | <source lang="java">
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| − | @Entity
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| − | public class Employee {
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| − |
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| − | @OneToOne(mappedBy="resident")
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| − | private Address residence;
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| − |
| + | |
| − | }
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| − | </source>
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| − | Use the EclipseLink extension '''@XmlInverseReference''' to map the back-pointer:
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| − | <source lang="java">
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| − | @Entity
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| − | public class Address {
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| − |
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| − | @OneToOne
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| − | @JoinColumn(name="E_ID")
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| − | @XmlInverseReference(mappedBy="residence")
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| − | private Employee resident;
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| − |
| + | |
| − | }
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| − | </source>
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| − | {{EclipseLink_MOXy
| + | |
| − | |version=2.2.0 DRAFT
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| − | |previous=[[EclipseLink/UserGuide/MOXy/Relationships/Privately Owned|Privately owned]]
| + | |
| − | |next=[[EclipseLink/UserGuide/MOXy/Relationships/Privately_Owned/One-to-Many|One-to-many]]
| + | |
| − | |up=[[EclipseLink/UserGuide/MOXy/Relationships/Privately Owned|Privately owned]]
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| − | }}
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