Hibernate - Annotations

package com.spring.hibernate;


import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

// Entity is declare to make this class an object for the
// database
@Entity

// By default hibernate will name the table Student as class
// name but @Table annotation override it to student
@Table(name="student")
public class Student {
    
    @Id
    private int id;
    private String firstName;
    private String city;
    
    public Student() {
        super();
        
    }

    public Student(int id, String firstName, String city) {
        super();
        this.id = id;
        this.firstName = firstName;
        this.city = city;
    }

       //   Basic getters and setters to set and get values

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    @Override
    public String toString() {
        return "Student [id=" + id + ", firstName=" + firstName + ", city=" + city + "]";
    }

    
}

package com.spring.hibernate;

import java.util.Arrays;
import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Lob;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;

@Entity
@Table(name="address")
public class Address {
    // @id make address_id as a primary key and @GeneratedValue
    // auto increment
    @Id
    @GeneratedValue
    @Column(name="address_id")
    private int addid;
  
    // This will override and make column length 50 in
    // place of street
    @Column(length=50)
    private String street;
  
      // This will override and make column name City in
    // place of City
      @Column(name="city")
    private String city;
  
    private boolean isOpen;
  
       // This will not create column name x in database
       @Transient
    private double x;
       
      // This will override and make column name date with specific Date format
    @Temporal(TemporalType.DATE)
    private Date date;
    
       //Lob to tell hibernate that image’s a large object and is not a simple object
    @Lob
    private byte[] images;
    
    public Address(int addid, String street, String city, boolean isOpen, double x, Date date, byte[] images) {
        super();
        this.addid = addid;
        this.street = street;
        this.city = city;
        this.isOpen = isOpen;
        this.x = x;
        this.date = date;
        this.images = images;
    }
    public Address() {
        super();
        // TODO Auto-generated constructor stub
    }
    
    public int getAddid() {
        return addid;
    }
    public void setAddid(int addid) {
        this.addid = addid;
    }
    public String getStreet() {
        return street;
    }
    public void setStreet(String street) {
        this.street = street;
    }
    public String getCity() {
        return city;
    }
    public void setCity(String city) {
        this.city = city;
    }
    public boolean isOpen() {
        return isOpen;
    }
    public void setOpen(boolean isOpen) {
        this.isOpen = isOpen;
    }
    public double getX() {
        return x;
    }
    public void setX(double x) {
        this.x = x;
    }
    public Date getDate() {
        return date;
    }
    public void setDate(Date date) {
        this.date = date;
    }
    public byte[] getImages() {
        return images;
    }
    public void setImages(byte[] images) {
        this.images = images;
    }
    @Override
    public String toString() {
        return "Address [addid=" + addid + ", street=" + street + ", city=" + city + ", isOpen=" + isOpen + ", x=" + x
                + ", date=" + date + ", images=" + Arrays.toString(images) + "]";
    }

}

package com.spring.hibernate;

import java.util.Date;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;


public class App 
{
    public static void main( String[] args )
    {
        System.out.println( "Project Started" );
       
        // We use sessionfactory to build a session for
        // database and hibernate
        SessionFactory factory = new Configuration().configure().buildSessionFactory();
         
        //creating object of student
        Student student= new Student(102,"xyz","pune");
        System.out.println(student);
         
        
        //creating object of class
        
        Address address= new  Address();
        address.setStreet("JBRoad");
        address.setCity("Pune");
        address.setDate(new Date());
        address.setX(34.8);
        address.setOpen(true);
        
        
       // opening a session
       Session session = factory.openSession();
       // Transaction is a java object used to give the
       // instructions to database
       Transaction tx=session.beginTransaction();
         // we use save to provide the object to push in
       // database table
       session.save(student);
       session.save(address);
       // commit is a transaction function used to push
       // some changes to database with reference to hql
       // query
       tx.commit();
       session.close();
    }
}