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  • Hibernate One to One Mapping

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    Basic Hibernate Mapping:

    1. One to one mapping

    One to one mapping is performed by one-to-one element. No foreign key is created in primary table. Let us see one simple example, in which we are using bidirectional association.

    There are two persistent classes Student.java & Address.java. Student class contain Address class reference and vice versa

    Student.java

    package com.hibernateExample;  
    
    public class Student {  
    private int studentId;  
    private String name,email;  
    private Address address; 
    }
    

    Address.java

    package com.hibernateExample;  
    
    public class Address {  
    private int addressId;  
    private String addressLine1,city,state,country;  
    private int pincode;  
    private Student student;  
    

    There are two mapping files for the persistent classes namely, student.hbm.xml & address.hbm.xml

    In the mapping files, we are using one-to-one element.

    student.hbm.xml

    <?xml version='1.0' encoding='UTF-8'?>  
    <!DOCTYPE hibernate-mapping PUBLIC  
              "-//Hibernate/Hibernate Mapping DTD 3.0//EN"  
              "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">  
    
               <hibernate-mapping>  
              <class name="com.hibernateExample.Student" table="student">  
              <id name="studentId">  
              <generator class="increment"></generator>  
              </id>  
              <property name="name"></property>  
              <property name="email"></property>  
    
              <one-to-one name="address" cascade="all"></one-to-one>  
              </class>  
    
              </hibernate-mapping>  
    

    address.hbm.xml

    <?xml version='1.0' encoding='UTF-8'?>  
    <!DOCTYPE hibernate-mapping PUBLIC  
              "-//Hibernate/Hibernate Mapping DTD 3.0//EN"  
              "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">  
    
               <hibernate-mapping>  
              <class name="com.hibernateExample.Address" table="address">  
              <id name="addressId">  
              <generator class="foreign">  
              <param name="property">student</param>  
              </generator>  
              </id>  
              <property name="addressLine1"></property>  
              <property name="city"></property>  
              <property name="state"></property>  
              <property name="country"></property>  
    
              <one-to-one name="student"></one-to-one>  
              </class>  
    
              </hibernate-mapping>  
    

    A configuration file named hibernate.cfg.xml contains information about the database and mapping file.

    <!DOCTYPE hibernate-configuration PUBLIC  
              "-//Hibernate/Hibernate Configuration DTD 3.0//EN"  
              "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">  
    
    <hibernate-configuration>  
    
        <session-factory>  
            <property name="hbm2ddl.auto">update</property>  
            <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>  
            <property name="connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>  
            <property name="connection.username">system</property>  
            <property name="connection.password">oracle</property>  
            <property name="connection.driver&#95;class">oracle.jdbc.driver.OracleDriver</property>  
        <mapping resource="student.hbm.xml"/>  
        <mapping resource="address.hbm.xml"/>  
        </session-factory>  
    
    </hibernate-configuration> 
    

    To store the data :

    ..........................................
    .........................................
    
    
     Student st1=new Student();  
            st1.setName("RaviShekar");  
            st1.setEmail("ravi12@gmail.com");  
    
            Address address1=new Address();  
            address1.setAddressLine1("A-22,vikas nagar");  
            address1.setCity("Ghaziabad");  
            address1.setState("UP");  
            address1.setCountry("India");  
            address1.setPincode(201301);  
    
    
            st1.setAddress(address1);  
            address1.setStudent(st1);  
    
            session.persist(st1);
    
    
      ...............................................
      ................................................
    
    
    

    To fetch the data :

           ...........................................
           ........................................
    
           Query query=session.createQuery("from Student s");  
            List list=query.list();  
    
            Iterator itr=list.iterator();  
             while(itr.hasNext()){  
             Student stu=itr.next();  
             Address address=stu.getAddress();  
       .......................................
       ...............................................
    

    Hope it helps someone!

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