In this tutorial, we are going to show you how to work with Hibernate Right Join.

What is Right Join?

Right Join is a keyword in SQL, which returns all the data from the right-hand side (table2) and matched records from the left-hand side table (table1). We can see the NULL values from the left side if there is no match.

Hibernate Right Join :

We can apply the Joins in Hibernate by using the hql query or native sql query. To make a join between the two tables, those two tables must be in a logical relationship. We can meet the relationship between two tables by applying the parent table’s primary key as the child table’s foreign key.

Hibernate Right Join Example :

In the previous tutorials, we have discussed Hibernate Left Join; here I am taking the same entities for this Right Join also. Customer and Items these two are having one to many relationship. That means one Customer can have multiple Items.

Project Structure :

Hibernate Right Join Example

Create customer and item tables with data to apply right join.

Customer Table :

Hibernate Right Join Customer

Item Table :

Hibernate Right Join Item

Customer.java

Customer.java
package com.otp.hibernate.pojo;

import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.Table;

@Entity
@Table(name = "customer")
public class Customer {
    @Id
    @Column(name = "cid")
    private int customerId;
    @Column(name = "cname", length = 15)
    private String customerName;
    @Column(name = "ccity", length = 20)
    private String customerCity;

    @OneToMany(targetEntity = Item.class, cascade = CascadeType.ALL)
    @JoinColumn(name = "cid",referencedColumnName="cid")
    private List items;

    public int getCustomerId() {
        return customerId;
    }

    public void setCustomerId(int customerId) {
        this.customerId = customerId;
    }

    public String getCustomerName() {
        return customerName;
    }

    public void setCustomerName(String customerName) {
        this.customerName = customerName;
    }

    public String getCustomerCity() {
        return customerCity;
    }

    public void setCustomerCity(String customerCity) {
        this.customerCity = customerCity;
    }

    public List getItems() {
        return items;
    }

    public void setItems(List items) {
        this.items = items;
    }

}

Item.java

Item.java
package com.otp.hibernate.pojo;

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

@Entity
@Table(name="item")
public class Item {
    @Id
    @Column(name="id")
    private int itemId;
    @Column(name="iname")
    private String itemName;
    @Column(name="price")
    private int price;

    public int getItemId() {
        return itemId;
    }

    public void setItemId(int itemId) {
        this.itemId = itemId;
    }

    public String getItemName() {
        return itemName;
    }

    public void setItemName(String itemName) {
        this.itemName = itemName;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

}

Hibernate.cfg.xml

Hibernate.cfg.xml
<hibernate-configuration>
    <session-factory>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.username">root</property>
        <property name="connection.password">123456</property>
        <property name="show_sql">true</property>
        <mapping class="com.otp.hibernate.pojo.Customer" />
        <mapping class="com.otp.hibernate.pojo.Item" />
    </session-factory>
</hibernate-configuration>

HibernateUtil.java

HibernateUtil.java
package com.otp.hibernate.pojo;

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

public class HibernateUtility{
    private static SessionFactory factory;

    private HibernateUtility() {
    }

    public synchronized static SessionFactory getSessionFactory() {
        if (factory == null) {
            factory = new Configuration().configure("hibernate.cfg.xml")
                    .buildSessionFactory();
        }
        return factory;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return new RuntimeException("Clone not Supported");
    }

}

Output :

Hibernate Right Join Output

Happy Learning 🙂

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