Hibernate Inner Join

In this section, you will learn how to do Inner Join in Hibernate.

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Hibernate Inner Join

In this section, you will learn how to do Inner Join in Hibernate.

Inner Join means to show records common to both table. The common records are determined by the one to many mapping columns. As you can see in the below figure address_id is the mapping field for the two tables  : employee and address , which also act as join column or field for the two tables.

First you need to do one to many mapping before using Inner join query. If you still unaware of one to many mapping click here.

The project structure is given below :

 

The SQL query used to create the two database table is given below :

CREATE TABLE `employee` (
`employee_id` bigint(10) NOT NULL auto_increment, 
`firstname` varchar(50) default NULL, 
`lastname` varchar(50) default NULL, 
`cell_phone` varchar(15) default NULL, 
`address_id` bigint(20) default NULL, 
PRIMARY KEY (`employee_id`), 
KEY `FK_employee` (`address_id`), 
CONSTRAINT `FK_employee` FOREIGN KEY (`address_id`) REFERENCES `address` (`address_id`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 


CREATE TABLE `address` (
`address_id` bigint(20) NOT NULL auto_increment,
`street` varchar(50) default NULL,
`city` varchar(50) default NULL,
`state` varchar(50) default NULL,
`country` varchar(50) default NULL,
PRIMARY KEY (`address_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 

CODE

hibernate.cfg.xml( \src\hibernate.cfg.xml )

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

<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://192.168.10.13:3306/anky</property>
<property name="connection.username">root</property>
<property name="connection.password">root</property>

<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="current_session_context_class">thread</property>
<property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<property name="show_sql">true</property>
<property name="hbm2ddl.auto">validate</property>

</session-factory>
</hibernate-configuration>

Address.java ( /src/net/roseindia/Address.java )

package net.roseindia;

import java.util.Set;

public class Address {

private Long addressId;

private String street;

private String city;

private String state;

private String country;

private Set<Employee> employees;

public Long getAddressId() {
return addressId;
}

public void setAddressId(Long addressId) {
this.addressId = addressId;
}

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 String getState() {
return state;
}

public void setState(String state) {
this.state = state;
}

public String getCountry() {
return country;
}

public void setCountry(String country) {
this.country = country;
}

public Set<Employee> getEmployees() {
return employees;
}

public void setEmployees(Set<Employee> employees) {
this.employees = employees;
}

}

Address.hbm.xml  ( /src/net/roseindia/Address.hbm.xml  )

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="net.roseindia">
<class name="Address" table="address">
<id name="addressId" column="address_id">
<generator class="native" />
</id>
<property name="street" column="street"/>
<property name="city" column="city"/>
<property name="state" column="state"/>
<property name="country" column="country"/>
<set name="employees" table="employee"
inverse="true" lazy="true" fetch="select">
<key>
<column name="address_id" not-null="true" />
</key>
<one-to-many class="net.roseindia.Employee" />
</set>
</class>
</hibernate-mapping>

Employee.java ( /src/net/roseindia/Employee.java )

package net.roseindia;

public class Employee {
private Long employeeId;

private String firstname;

private String lastname;

private String cellphone;

private Address address;

public Address getAddress() {
return address;
}

public void setAddress(Address address) {
this.address = address;
}

public Employee() {}

public Employee(String firstname, String lastname, String phone) {
this.firstname = firstname;
this.lastname = lastname;
this.cellphone = phone;
}

public Long getEmployeeId() {
return employeeId;
}

public void setEmployeeId(Long employeeId) {
this.employeeId = employeeId;
}

public String getFirstname() {
return firstname;
}

public void setFirstname(String firstname) {
this.firstname = firstname;
}

public String getLastname() {
return lastname;
}

public void setLastname(String lastname) {
this.lastname = lastname;
}

public String getCellphone() {
return cellphone;
}

public void setCellphone(String cellphone) {
this.cellphone = cellphone;
}

}

Employee.hbm.xml(  \src\net\roseindia\Employee.hbm.xml  )

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="net.roseindia">

<class name="Employee" table="employee">
<id name="employeeId" column="employee_id">
<generator class="native" />
</id>

<property name="firstname" column="firstname"/>
<property name="lastname" column="lastname" />
<property name="cellphone" column="cell_phone" />

<many-to-one name="address" class="net.roseindia.Address" fetch="select">
<column name="address_id" not-null="true" />
</many-to-one>

</class>
</hibernate-mapping>

InnerJoin.java ( \src\net\roseindia\InnerJoin.java )

package net.roseindia;

import java.util.*;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import org.hibernate.service.ServiceRegistryBuilder;

public class InnerJoin {
private static SessionFactory sf;
private static ServiceRegistry serviceRegistry;

public static void main(String[] args) {

try {
Configuration configuration = new Configuration().addResource(
"net/roseindia/Address.hbm.xml").addResource(
"net/roseindia/Employee.hbm.xml");
configuration.configure()
.setProperty("hibernate.show_sql", "false");
serviceRegistry = new ServiceRegistryBuilder().applySettings(
configuration.getProperties()).buildServiceRegistry();
sf = configuration.buildSessionFactory(serviceRegistry);
} catch (Throwable ex) {
System.err.println("Failed to create sessionFactory object." + ex);
throw new ExceptionInInitializerError(ex);
}

System.out.println("*************************Hibernate Inner Join Example*************************");

Session session = sf.openSession();
String hql = "select e.firstname,e.lastname,e.cellphone,a.city,a.state,a.country from Employee e inner join e.address as a";
Query query = session.createQuery(hql);

System.out.println("First Name\t" + "Last Name\t" + "Cell Phone\t"
+ "City\t\t" + "State\t" + "Country\t\t\t");
System.out.println("--------------------------------------------------------------------------------");

for (Iterator it = query.iterate(); it.hasNext();) {
Object[] row = (Object[]) it.next();
System.out.print(row[0]);
System.out.print("\t\t" + row[1]);
System.out.print("\t\t" + row[2]);
System.out.print("\t" + row[3]);
System.out.print("\t" + row[4]);
System.out.print("\t" + row[5]);
System.out.println();
}

}
}

OUTPUT

In the console, you will get the following output :

*************************Hibernate Inner Join Example*************************
First Name    Last Name   Cell Phone    City        State    Country 
--------------------------------------------------------------------------------
Romesh        Thapar      9999999999    New Delhi   Delhi    India
Smita         Khanna      3333333333    New Delhi   Delhi    India

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Comments:2
aruna
July 1, 2013
How

How to run this project.. please reply..
surya handoko
February 21, 2014
running well

great tutorial !!! finally I can join and select two tables with hibernate thank u very much sir .

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