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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