Membuat Simple Entity di Hibernate

Sekarang kita akan membuat entity dengan menggunakan Annotation. Untuk membuat entity pada dasarnya sama dengan membuat JavaBeans hanya memiliki tambahan annotation seperti @Entity, @Column, @Table dan lain-lain nanti kita akan bahas lebih lanjut di masing-masing annotation pada hibernate.

Ok sekarang kita buat kelas baru dengan nama Mahasiswa dalam package com.maryanto.dimas.bootcamp.entity seperti berikut:

Kemudian kita tambahkan property mapping supaya hibernate akan melakukan scan terhadap Annotation dan di translate ke table di database seperti berikut:

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

        <!-- add mapping here! -->
        <mapping class="com.maryanto.dimas.bootcamp.example.entity.Mahasiswa"/>
    </session-factory>
</hibernate-configuration>

Atau selain itu juga temen-temen bisa tambahkan di class HibernateConfiguration seperti berikut:

package com.maryanto.dimas.bootcamp.example.config;

import com.github.fluent.hibernate.cfg.scanner.EntityScanner;
import com.maryanto.dimas.bootcamp.example.entity.Mahasiswa;
import com.maryanto.dimas.bootcamp.example.entity.buku.Penerbit;
import lombok.extern.slf4j.Slf4j;
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistry;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;

import java.util.List;

@Slf4j
public class HibernateConfiguration {

    private static final SessionFactory ourSessionFactory;

    static {
        final StandardServiceRegistry registry = new StandardServiceRegistryBuilder()
                .configure().build();
        try {
            MetadataSources metadataSources = new MetadataSources(registry);
//            load annotation class here!            
            metadataSources.addAnnotatedClass(Mahasiswa.class);

            ourSessionFactory = metadataSources.buildMetadata()
                    .buildSessionFactory();

        } catch (Throwable ex) {
            StandardServiceRegistryBuilder.destroy(registry);
            throw new ExceptionInInitializerError(ex);
        }
    }
}

Jika sudah sekarang kita coba jalankan unit testnya kembali dan kita lihat outputnya seperti berikut:

com.maryanto.dimas.bootcamp.test.TestOpeningConnectionHibernate
[main] INFO com.maryanto.dimas.bootcamp.test.TestOpeningConnectionHibernate - init hibernate session
Nov 21, 2020 2:05:55 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate ORM core version 5.4.22.Final
Nov 21, 2020 2:05:55 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
Nov 21, 2020 2:05:56 PM org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator instantiateC3p0Provider
WARN: HHH000022: c3p0 properties were encountered, but the c3p0 provider class was not found on the classpath; these properties are going to be ignored.
Nov 21, 2020 2:05:56 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
Nov 21, 2020 2:05:56 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [org.postgresql.Driver] at URL [jdbc:postgresql://localhost:5432/hibernate_core]
Nov 21, 2020 2:05:56 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {password=****, autocommit=false, user=bootcamp}
Nov 21, 2020 2:05:56 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
Nov 21, 2020 2:05:56 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl$PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 10 (min=1)
Nov 21, 2020 2:05:56 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.PostgreSQL10Dialect
Nov 21, 2020 2:05:56 PM org.hibernate.validator.internal.util.Version <clinit>
INFO: HV000001: Hibernate Validator 6.1.6.Final
Nov 21, 2020 2:05:56 PM org.hibernate.resource.transaction.backend.jdbc.internal.DdlTransactionIsolatorNonJtaImpl getIsolatedConnection
INFO: HHH10001501: Connection obtained from JdbcConnectionAccess [org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator$ConnectionProviderJdbcConnectionAccess@44d64d4e] for (non-JTA) DDL execution was not in auto-commit mode; the Connection 'local transaction' will be committed and the Connection will be set into auto-commit mode.
Hibernate: 
    
    create table master_mahasiswa (
       kode int8 not null,
        is_active boolean,
        bio text,
        created_by varchar(255),
        created_date timestamp not null,
        nama_mahasiswa varchar(25) not null,
        nim_mahasiswa varchar(8) not null,
        tanggal_lahir date not null,
        tahun_masuk int4,
        primary key (kode)
    )
Hibernate: 
    
    alter table if exists master_mahasiswa 
       drop constraint if exists UK_gld9llgpgky9s6dmyygi9r2lp
Nov 21, 2020 2:05:56 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper$StandardWarningHandler logWarning
WARN: SQL Warning Code: 0, SQLState: 00000
Nov 21, 2020 2:05:56 PM org.hibernate.engine.jdbc.spi.SqlExceptionHelper$StandardWarningHandler logWarning
WARN: constraint "uk_gld9llgpgky9s6dmyygi9r2lp" of relation "master_mahasiswa" does not exist, skipping
Hibernate: 
    
    alter table if exists master_mahasiswa 
       add constraint UK_gld9llgpgky9s6dmyygi9r2lp unique (nim_mahasiswa)
Hibernate: create sequence hibernate_sequence start 1 increment 1
Nov 21, 2020 2:05:56 PM org.hibernate.engine.transaction.jta.platform.internal.JtaPlatformInitiator initiateService
INFO: HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
[main] INFO com.maryanto.dimas.bootcamp.test.TestOpeningConnectionHibernate - destroy hibernate session!

Nah dari output tersebut kita akan lihat bahwa hibernate akan membuatkan kita table yang kita buat dari JavaBean Mahasiswa dan juga contraint seperti unique key pada kolom nim_mahasiswa.

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