Hibernate Many to One Annotation Tutorial

Add following dependency in pom.xml file.

<dependencies>

<dependency>
	<groupId>org.hibernate</groupId>
	<artifactId>hibernate-core</artifactId>
	<version>5.4.28.Final</version>
</dependency>

<dependency>
	<groupId>mysql</groupId>
	<artifactId>mysql-connector-java</artifactId>
	<version>5.1.6</version>
</dependency>

</dependencies>
  

hibernate.cfg.xml

   <?xml version = "1.0" encoding = "utf-8"?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
     "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>

<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/stds</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">root</property>

<property name="hbm2ddl.auto">update</property>
<property name="show_sql">true</property>
		
	
</session-factory>
</hibernate-configuration>
   

College.java

package com.deepsingh44.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;

@Entity
public class College {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	private String name;

	public int getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

}

  

Students.java

package com.deepsingh44.model;

import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;

@Entity
public class Students {
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int roll;
	private String name;
	private float marks;
	@ManyToOne(cascade = CascadeType.ALL)
	private College college;

	public College getCollege() {
		return college;
	}

	public void setCollege(College college) {
		this.college = college;
	}

	public int getRoll() {
		return roll;
	}

	public void setRoll(int roll) {
		this.roll = roll;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public float getMarks() {
		return marks;
	}

	public void setMarks(float marks) {
		this.marks = marks;
	}

}

  

Test.java

package com.deepsingh44.model;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.Metadata;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

public class Test {
	public static void main(String[] args) {

// Load your configuration file
StandardServiceRegistry ssr = new StandardServiceRegistryBuilder().
configure("hibernate.cfg.xml").
build();
Metadata meta = new MetadataSources(ssr).
addAnnotatedClass(Students.class).
addAnnotatedClass(College.class)
.getMetadataBuilder().
build();

// Get sessionFactory object
SessionFactory factory = meta.getSessionFactoryBuilder().build();

// Get session object
Session session = factory.openSession();

Students s1 = new Students();
s1.setName("Ramesh");
s1.setMarks(67.7f);
s1.setRoll(1);

Students s2 = new Students();
s2.setName("Suresh");
s2.setMarks(77.7f);
s2.setRoll(2);

College college = new College();
college.setName("A.B.C");

s1.setCollege(college);
s2.setCollege(college);

Transaction txt=session.beginTransaction();
		
session.save(s1);
session.save(s2);

// Actual transaction here
txt.commit();

session.close();
System.out.println("Successfully Inserted");

}
}