As we discussed a simple hibernate program to save a student class object into the database using xml mapping. Let us do the same exercise with the annotations.
Example:
Student.java
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
/**
* This class represents a persistent class for Student.
* @author javawithease
*/
@Entity
@Table(name= "STUDENT")
public class Student {
//data members
private int studentId;
private String firstName;
private String lastName;
private String className;
private String rollNo;
private int age;
//no-argument constructor
public Student(){
}
//getter and setter methods
@Id
@GeneratedValue
@Column(name = "Student_Id", unique = true, nullable = false)
public int getStudentId() {
return studentId;
}
public void setStudentId(int studentId) {
this.studentId = studentId;
}
@Column(name = "First_Name")
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
@Column(name = "Last_Name")
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
@Column(name = "Class")
public String getClassName() {
return className;
}
public void setClassName(String className) {
this.className = className;
}
@Column(name = "RollNo")
public String getRollNo() {
return rollNo;
}
public void setRollNo(String rollNo) {
this.rollNo = rollNo;
}
@Column(name = "Age")
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
} |
hibernate.cfg.xml
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration SYSTEM
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="dialect">
org.hibernate.dialect.OracleDialect
</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_class">
oracle.jdbc.driver.OracleDriver
</property>
<property name="hbm2ddl.auto">
update
</property>
<property name="show_sql">
true
</property>
<mapping resource="student.hbm.xml"/>
</session-factory>
</hibernate-configuration> |
HibernateUtil.java
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
* This is a utility class for getting the hibernate session object.
* @author javawithease
*/
public class HibernateUtil {
private static final SessionFactory sessionFactory =
buildSessionFactory();
private static SessionFactory buildSessionFactory() {
SessionFactory sessionFactory = null;
try {
//Create the session factory object.
return new AnnotationConfiguration().configure()
.buildSessionFactory();
}
catch (Exception e) {
e.printStackTrace();
}
return sessionFactory;
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
} |
HibernateTest.java
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.Transaction;
import com.javawithease.persistence.HibernateUtil;
/**
* This class is used for the hibernate operations.
* @author javawithease
*/
public class HibernateTest {
public static void main(String args[]){
//Create the student object.
Student student = new Student();
//Setting the object properties.
student.setFirstName("Vivek");
student.setLastName("Solenki");
student.setClassName("MCA final");
student.setRollNo("MCA/07/70");
student.setAge(27);
Transaction tx = null;
//Get the session object.
Session session =
HibernateUtil.getSessionFactory().openSession();
try{
//Start hibernate session.
tx = session.beginTransaction();
//Insert a new student record in the database.
session.save(student);
//Commit hibernate transaction if no exception occurs.
tx.commit();
System.out.println("Saved Successfully.");
}catch (HibernateException e) {
if(tx!=null){
//Roll back if any exception occurs.
tx.rollback();
}
e.printStackTrace();
}finally {
//Close hibernate session.
session.close();
}
}
} |
Output:
Hibernate: select hibernate_sequence.nextval from dual
Hibernate: insert into Student (First_Name, Last_Name, Class,
RollNo, Age, Student_Id) values (?, ?, ?, ?, ?, ?)
Saved Successfully. |
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