https://github.com/nfriaa/hibernate-tutorial3

Hibernate tutorial 3 : Hibernate Annotations
https://github.com/nfriaa/hibernate-tutorial3

annotations hibernate hibernate-annotations hibernate5 java maven mysql

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Hibernate tutorial 3 : Hibernate Annotations

• Host: GitHub
• URL: https://github.com/nfriaa/hibernate-tutorial3
• Owner: nfriaa
• License: mit
• Created: 2017-10-02T23:02:37.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2017-10-18T17:40:29.000Z (about 7 years ago)
• Last Synced: 2024-11-15T19:42:13.024Z (2 months ago)
• Topics: annotations, hibernate, hibernate-annotations, hibernate5, java, maven, mysql
• Language: Java
• Size: 9.77 KB
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# hibernate-tutorial3

Hibernate Annotations

[![contributions welcome](https://img.shields.io/badge/contributions-welcome-orange.svg?style=flat)](https://github.com/nfriaa/hibernate-tutorial3/issues) [![Travis](https://img.shields.io/travis/rust-lang/rust.svg)](https://github.com/nfriaa/hibernate-tutorial3) [![license](https://img.shields.io/github/license/mashape/apistatus.svg)](https://github.com/nfriaa/hibernate-tutorial3/blob/master/LICENSE)

## Description

A sample code to use Hibernate in **Annotations** mode

* JavaSE 8

* Hibernate 5 / Annotations

* Maven 4

* MySQL 5

## 1. Database (the same in Tutorial 2)

We will use the same database / table

## 2. Maven "pom.xml" dependencies

```xml

    

    

        mysql

        mysql-connector-java

        6.0.6

    

    

    

        org.hibernate

        hibernate-core

        5.2.11.Final

    

```

## 3. Changes in "hibernate.cfg.xml"

```xml

    

        

        org.hibernate.dialect.MySQL5InnoDBDialect

        jdbc:mysql://localhost:3306/persist_db?useTimezone=true&serverTimezone=UTC

        root

        

        

        true

        false

        update

        

        

    

```

* hibernate.hbm2ddl.auto : update => update the database schema with defined entities

* hibernate.hbm2ddl.auto : create => creates the schema necessary for defined entities, destroying any previous data

## 3. No "Product.hbm.xml" file

There is no "Product.hbm.xml" mapping file. To do mapping we will use Hibernate **Annotations** instead

## 4. Annotations in POJO classes "Product.java"

```java

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.GeneratedValue;

import javax.persistence.GenerationType;

import javax.persistence.Id;

import javax.persistence.Table;

@Entity

@Table(name = "product")

public class Product

{

    @Id

    @GeneratedValue(strategy = GenerationType.IDENTITY)

    @Column(name = "id", nullable = false)

    private int id;

    @Column(name = "name", length = 255, nullable = true)

    private String name;

    @Column(name = "price", nullable = true)

    private int price;

    // GETTERs and SETTERs here...

}

```

* @Entity : link to the "Product" class (Bean / POJO)

* @Table : table that will be used to persist the entity in the database

* @Id : primary key

* @GeneratedValue : generation type for the primary key (ex : AUTO_INCREMENT in MySQL)

* @Column : details of the column to which a property will be mapped

## 5. Class "Application.java"

Use exactly "Application.java" in Tutorial 2 to test