1.
Introduction to JPA Framework
www.collaborationtech.co.in
Bengaluru INDIA
Presentation By
Ramananda M.S Rao

2.
Content
Content
Introduction
JPA API Overview
Database Table and Schema
JPA Installation and Setup
Configuration – Persistent Unit
Persistence Object or Entity Bean
Entity Annotations
Mapping an Object - O-R Mappings
Joins and Collections
Creating Entity Manager
Using Entity Manager
Persistent Types
Using Entity Transactions
Querying – JPQL
Testing the Entity Bean
Writing Test Cases
CRUD Operations on Entity Beans
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3.
Content
Inheritance Mapping
Single Table Inheritance
Join Table Inheritance
Entity Bean Lifecycle
Data relationships
One-to-one relationships
Bidirectional one-to-one relationships
Many-to-one relationships
bidirectional many-to-one relationship
One-to-many relationships
Bidirectional One-to-many relationships
Many-to-many relationships
Bidirectional many-to-many relationships
Writing Service Using JPA
Using JPA with Spring
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4.
Introduction
 Java Persistence API is a collection of classes and methods
to persistently store the vast amounts of data into a
database which is provided by the Oracle Corporation.
 Generally, Java developers use lots of code, or use the
proprietary framework to interact with the database,
whereas using JPA, the burden of interacting with the
database reduces significantly. It forms a bridge between
object models (Java program) and relational models
(database program).
 Java Persistence API (JPA) is the Java standard for mapping
Java objects to a relational database.
 The Java Persistence API (JPA) is a Java specification for
accessing, persisting, and managing data between Java
objects / classes and a relational database.
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5.
Database Table and Schema
The name of the schema to be used in MySQL is "mydb", but if
you decide to use a different one just remember to change any
reference to mydb to the name of your Schema. First let us start
by creating the following table in MySQL:
CREATE TABLE IF NOT EXISTS `mydb`.`company` (
`idcompany` INT NOT NULL AUTO_INCREMENT ,
`name` VARCHAR(45) NOT NULL ,
`country` VARCHAR(45) NOT NULL ,
`privat` TINYINT(1) NOT NULL DEFAULT 0 ,
`ownername` VARCHAR(45) NULL ,
`numberemployees` INT NOT NULL DEFAULT 0 ,
`income` DOUBLE NOT NULL DEFAULT 0.0 ,
PRIMARY KEY (`idcompany`)
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6.
JPA Installation & Setup
JPA can be easily installed and integrated with your current Java
environment following a few simple steps without any complex setup
procedures.
Step 1: Installing JPA
Download Eclipse IDE form following link
https://www.eclipse.org/downloads/
Installing JPA using Eclipselink
Eclipselink is a library therefore we cannot add it directly to Eclipse
IDE. For installing JPA using Eclipselink you need to follow the
following steps.
Create a new JPA project by selecting File->New->JPA Project in the
Eclipse IDE.
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7.
JPA Installation & Setup
 You will get a dialog box named New JPA Project. Enter project
name ‘Collaba’, check the jre version and click next.
 Click on download library (if you do not have the library) in the
user library section.
 Select the latest version of Eclipselink library in the Download
library dialog box and click next.
 Accept the terms of license and click finish for download library.
 You will find the process of downloading a file.
 After downloading, select the downloaded library in the user
library section and click finish.
 Finally you get the project file in the Package Explorer in Eclipse
IDE. Extract all files, you will get the folder and file hierarchy.
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8.
JPA Installation & Setup
Adding MySQL connector to Project
MySQL database for database operations. It requires mysql-connector
jar to interact with java program.
Follow the steps to configure database jar to your project.
 Go to Project properties -> Java Build Path by right click on it. You
will get a dialog box as follows: Click on Add External Jars.
 Go to the jar location in your system memory, select and click on
open.
 Click ok on properties dialog. You will get the MySQL-connector Jar
into your project. Now you are able to do database operations
using MySQL.
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9.
Persistence
 JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, embeddable classes and mapped
superclasses) with related settings.
 Persistence units are defined in a persistence.xml file, which has to be located in the META-INF directory in the classpath
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence
http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="Eclipselink_JPA" transaction-type="RESOURCE_LOCAL">
<class>com.collaba.eclipselink.entity.BookEntityBean</class>
<properties>
<property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/jpatest"/>
<property name="javax.persistence.jdbc.user" value="jpa"/>
<property name="javax.persistence.jdbc.password" value="root"/>
<property name ="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="eclipselink.logging.level" value="FINE"/>
<property name="eclipselink.ddl-generation" value="create-tables"/>
</properties></persistence-unit></persistence>
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10.
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11.
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