Component Mapping in Hibernate Using Annotations

Component Mapping in Hibernate Using Annotations

For explanation watch video::

Directory Structure

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

<modelVersion>4.0.0</modelVersion>

<groupId>com.test</groupId>

<artifactId>ComponentMapping</artifactId>

<version>0.0.1-SNAPSHOT</version>

<packaging>jar</packaging>

<name>ComponentMapping</name>

<url>http://maven.apache.org</url>

<properties>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<maven.compiler.source>1.9</maven.compiler.source>

<maven.compiler.target>1.9</maven.compiler.target>

</properties>

<dependencies>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>3.8.1</version>

<scope>test</scope>

</dependency>

<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->

<dependency>

<groupId>org.hibernate</groupId>

<artifactId>hibernate-core</artifactId>

<version>5.4.10.Final</version>

</dependency>

<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->

<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>8.0.22</version>

</dependency>

<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->

<dependency>

<groupId>org.projectlombok</groupId>

<artifactId>lombok</artifactId>

<version>1.18.20</version>

<scope>provided</scope>

</dependency>

</dependencies>

</project>

hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC

"-//Hibernate/Hibernate Configuration DTD//EN"

"http://hibernate.sourceforge.net/hibernate-configuration-5.0.dtd">

<hibernate-configuration>

<session-factory>

<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/new</property>

<property name="hibernate.connection.username">root</property>

<property name="hibernate.connection.password">root</property>

<property name="show_sql">true</property>

<property name="format_sql">true</property>

<property name="hbm2ddl.auto">update</property>

</session-factory>

</hibernate-configuration>

Person

package com.entity;

import javax.persistence.Embedded;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.Table;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.NoArgsConstructor;

@Data

@AllArgsConstructor

@NoArgsConstructor

@Entity

@Table(name = "ptab")

public class Person {

@Id

@GeneratedValue(strategy = GenerationType.IDENTITY)

private Integer pid;

private String pname;

private String paddrs;

@Embedded

private JobDetails jobDetails;

}

JobDetails

package com.entity;

import javax.persistence.Embeddable;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.NoArgsConstructor;

@Data

@AllArgsConstructor

@NoArgsConstructor

@Embeddable

public class JobDetails {

private String desg;

private Double salary;

private String company;

}

HibernateUtil

package com.utility;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import org.hibernate.cfg.Configuration;

import com.entity.Person;

public class HibernateUtil {

static SessionFactory factory;

static {

Configuration cfg = new Configuration();

cfg.configure("hibernate.cfg.xml");

cfg.addAnnotatedClass(Person.class);

factory = cfg.buildSessionFactory();

}

public static SessionFactory getSessionFactory() {

return factory;

}

public static Session getSession() {

return factory.openSession();

}

}

Save

package com.test;

import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import com.entity.JobDetails;

import com.entity.Person;

import com.utility.HibernateUtil;

public class Save {

public static void main(String[] args) {

// get the sessionFactory Obj

SessionFactory factory = HibernateUtil.getSessionFactory();

// get the session Obj

Session ses = HibernateUtil.getSession();

try (factory; ses) {

//create the JobDetails

JobDetails job = new JobDetails();

job.setDesg("TL");

job.setSalary(20000.0);

job.setCompany("Idiot");

//create the Person Object

Person per = new Person();

per.setPname("Sam");

per.setPaddrs("Mumbai");

per.setJobDetails(job);

// begin the tx

ses.beginTransaction();

//save

ses.save(per);

// commit

ses.getTransaction().commit();

} catch (HibernateException he) {

he.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

}

}

Retrive

package com.test;

import java.util.List;

import org.hibernate.HibernateException;

import org.hibernate.Session;

import org.hibernate.SessionFactory;

import com.entity.Person;

import com.utility.HibernateUtil;

public class Retrive {

public static void main(String[] args) {

// get the sessionFactory Obj

SessionFactory factory = HibernateUtil.getSessionFactory();

// get the session Obj

Session ses = HibernateUtil.getSession();

try (factory; ses) {

List<Person> list = ses.createQuery("from Person").getResultList();

list.forEach(per -> {

System.out.println("Person Details " + per.getPid() + " " + per.getPname() + " " + per.getPaddrs());

System.out.println("Job Details " + per.getJobDetails().getDesg() + " "

+ per.getJobDetails().getSalary() + " " + per.getJobDetails().getCompany());

});

} catch (HibernateException he) {

he.printStackTrace();

} catch (Exception e) {

e.printStackTrace();

}

}

}