Hibernate – One-to-one relationship example
Hibernate one to one Mapping Example
hibernate one to one annotation example
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The Scripts
CREATE TABLE `user` (
`ID` int(11) NOT NULL AUTO_INCREMENT,
`NAME` varchar(45) DEFAULT NULL,
PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1$$
CREATE TABLE `address` (
`ID` int(11) NOT NULL,
`ADDRESS` varchar(45) DEFAULT NULL,
PRIMARY KEY (`ID`),
KEY `FK_ID` (`ID`),
CONSTRAINT `FK_ID` FOREIGN KEY (`ID`) REFERENCES `user` (`ID`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=latin1$$
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The User.java Domain Class
@Entity
@Table(name = "user", catalog = "onetwoone")
public class User implements java.io.Serializable {
private Integer id;
private String name;
private Address addresses;
public User() {
}
@Id
@GeneratedValue(strategy = AUTO)
@Column(name = "ID", unique = true, nullable = false)
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(name = "NAME", length = 45)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@OneToOne(fetch = FetchType.LAZY, mappedBy = "user")
@Cascade( { CascadeType.ALL })
public Address getAddresses() {
return this.addresses;
}
public void setAddresses(Address addresses) {
this.addresses = addresses;
}
}
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The Addres class
To map the association of user in the Address class as a shared primary key association, you also need the @PrimaryKeyJoinColumn annotation:
@Entity
@Table(name = "address", catalog = "onetwoone")
public class Address implements java.io.Serializable {
private Integer id;
private User user;
private String address;
public Address() {
}
// Property accessors
@GenericGenerator(name = "generator", strategy = "foreign", parameters = @Parameter(name = "property", value = "user"))
@Id
@GeneratedValue(generator = "generator")
@Column(name = "ID", unique = true, nullable = false)
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
@OneToOne(fetch = FetchType.LAZY)
@PrimaryKeyJoinColumn
public User getUser() {
return this.user;
}
public void setUser(User user) {
this.user = user;
}
@Column(name = "ADDRESS", length = 45)
public String getAddress() {
return this.address;
}
public void setAddress(String address) {
this.address = address;
}
}
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Test Programme
public class TestOneTwoOneMapping {
public static void main(String[] args) {
User user=new User();
user.setName("Anish");
Address address =new Address();
address.setAddress("USA");
address.setUser(user);
user.setAddresses(address);
new UserDAO().save(user);
}
}
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The hibernatecfg.xml file
<?xml version='1.0' encoding='UTF-8'?>
<!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="connection.username">root</property>
<property name="connection.url">
jdbc:mysql://localhost/onetwoone
</property>
<property name="dialect">
org.hibernate.dialect.MySQLDialect
</property>
<property name="myeclipse.connection.profile">
com.mysql.jdbc.Driver
</property>
<property name="connection.password">password</property>
<property name="connection.driver_class">
com.mysql.jdbc.Driver
</property>
<property name="show_sql">true</property>
<mapping class="session.User" />
<mapping class="session.Address" />
</session-factory>
</hibernate-configuration>
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ANish
