In this section, you will learn how to develop a CRUD application using hibernate annotation.
Follows the following steps for developing the CRUD application in hibernate annotation.
Step 1: Create Domain Entity Class
Student.java
package com.sdnext.hibernate.tutorial.dto; import java.io.Serializable; import javax.persistence.Column; import javax.persistence.GeneratedValue; import javax.persistence.GenerationType; import javax.persistence.Id; @Entity @Table(name="STUDENT") public class Student implements Serializable { /** * serialVersionUID */ private static final long serialVersionUID = 8633415090390966715L; @Id @Column(name="ID") @GeneratedValue(strategy=GenerationType.AUTO) private int id; @Column(name="STUDENT_NAME") private String studentName; @Column(name="ROLL_NUMBER") private int rollNumber; @Column(name="COURSE") private String course; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getStudentName() { return studentName; } public void setStudentName(String studentName) { this.studentName = studentName; } public int getRollNumber() { return rollNumber; } public void setRollNumber(int rollNumber) { this.rollNumber = rollNumber; } public String getCourse() { return course; } public void setCourse(String course) { this.course = course; } }
Step 2: Create Hibernate Configuration file
hibernate.cfg.xml
file contains
(a.) database connection setting (database driver (com.mysql.jdbc.Driver), url (jdbc:mysql://localhost:3306/hibernateDB2), username (root) and password (root)),
(b.) SQL dialect (dialect – org.hibernate.dialect.MySQLDialect),
(c.) enable hibernate’s automatic session context management (current_session_context_class – thread),
(d.) disable the second level cache (cache.provider_class – org.hibernate.cache.NoCacheProvider),
(e.) print all executed SQL to stdout (show_sql – true) and
(f.) drop and re-create the database schema on startup (hbm2ddl.auto – none).
<hibernate-configuration> <session-factory> <!-- Database connection settings --> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="connection.url">jdbc:mysql://localhost:3306/hibernateDB2</property> <property name="connection.username">root</property> <property name="connection.password">root</property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">update</property> <mapping class="com.sdnext.hibernate.tutorial.dto.Student"> </mapping></session-factory> </hibernate-configuration>
Step 3: Create Hibernate Utility Class
HibernateUtil.java
package com.sdnext.hibernate.tutorial.utility; import org.hibernate.SessionFactory; import org.hibernate.cfg.AnnotationConfiguration; public class HibernateUtil { private static final SessionFactory sessionFactory; static { try { sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory(); } catch(Throwable th){ System.err.println("Enitial SessionFactory creation failed"+th); throw new ExceptionInInitializerError(th); } } public static SessionFactory getSessionFactory(){ return sessionFactory; } }
Step 4: Create Student on the database.
CreateStudent.java
package com.sdnext.hibernate.tutorial; import org.hibernate.Session; import org.hibernate.SessionFactory; import com.sdnext.hibernate.tutorial.dto.Student; import com.sdnext.hibernate.tutorial.utility.HibernateUtil; public class CreateStudent { /** * @param args */ public static void main(String[] args) { //Create student entity object Student student = new Student(); student.setStudentName("Dinesh Rajput"); student.setRollNumber(01); student.setCourse("MCA"); //Create session factory object SessionFactory sessionFactory = HibernateUtil.getSessionFactory(); //getting session object from session factory Session session = sessionFactory.openSession(); //getting transaction object from session object session.beginTransaction(); session.save(student); System.out.println("Inserted Successfully"); session.getTransaction().commit(); session.close(); sessionFactory.close(); } }
Now the following code the reading the student data from database.
Step 5: Reading the Student data from the database table STUDENT
ReadStudent.java
package com.sdnext.hibernate.tutorial; import java.util.List; import org.hibernate.Query; import org.hibernate.Session; import org.hibernate.SessionFactory; import com.sdnext.hibernate.tutorial.dto.Student; import com.sdnext.hibernate.tutorial.utility.HibernateUtil; public class ReadStudent { /** * @param args */ public static void main(String[] args) { //Create session factory object SessionFactory sessionFactory = HibernateUtil.getSessionFactory(); //getting session object from session factory Session session = sessionFactory.openSession(); //getting transaction object from session object session.beginTransaction(); Query query = session.createQuery("from Student"); List students = query.list(); for(Student student : students) { System.out.println("Roll Number: "+student.getRollNumber()+", Student Name: "+student.getStudentName()+", Course: "+student.getCourse()); } session.getTransaction().commit(); sessionFactory.close(); } }
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select student0_.ID as ID0_, student0_.COURSE as COURSE0_, student0_.ROLL_NUMBER as ROLL3_0_, student0_.STUDENT_NAME as STUDENT4_0_ from STUDENT student0_
Roll Number: 1, Student Name: Dinesh Rajput, Course: MCA
Roll Number: 2, Student Name: Anamika Rajput, Course: PGDCP
Roll Number: 3, Student Name: Adesh Rajput, Course: MA
Roll Number: 4, Student Name: Vinesh Rajput, Course: BA
The following code is for updating the data into the database table “STUDENT”.
Step 6: Update the Student Record in the Database.
UpdateStudent.java
package com.sdnext.hibernate.tutorial; import org.hibernate.Session; import org.hibernate.SessionFactory; import com.sdnext.hibernate.tutorial.dto.Student; import com.sdnext.hibernate.tutorial.utility.HibernateUtil; public class UpdateStudent { /** * @param args */ public static void main(String[] args) { //Create session factory object SessionFactory sessionFactory = HibernateUtil.getSessionFactory(); //getting session object from session factory Session session = sessionFactory.openSession(); //getting transaction object from session object session.beginTransaction(); Student student = (Student)session.get(Student.class, 2); student.setStudentName("Sweety Rajput"); System.out.println("Updated Successfully"); session.getTransaction().commit(); sessionFactory.close(); } }
Step 7: Delete the student data from the database.
DeleteStudent.java
package com.sdnext.hibernate.tutorial; import org.hibernate.Session; import org.hibernate.SessionFactory; import com.sdnext.hibernate.tutorial.dto.Student; import com.sdnext.hibernate.tutorial.utility.HibernateUtil; public class DeleteStudent { /** * @param args */ public static void main(String[] args) { //Create session factory object SessionFactory sessionFactory = HibernateUtil.getSessionFactory(); //getting session object from session factory Session session = sessionFactory.openSession(); //getting transaction object from session object session.beginTransaction(); Student student = (Student)session.load(Student.class, 4); session.delete(student); System.out.println("Deleted Successfully"); session.getTransaction().commit(); sessionFactory.close(); } }
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).
log4j:WARN Please initialize the log4j system properly.
Hibernate: select student0_.ID as ID0_0_, student0_.COURSE as COURSE0_0_, student0_.ROLL_NUMBER as ROLL3_0_0_, student0_.STUDENT_NAME as STUDENT4_0_0_ from STUDENT student0_ where student0_.ID=?
Deleted Successfully
Hibernate: delete from STUDENT where ID=?
In the Next Chapter we will discuss about the Object states in the Hibernate.
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