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).

1. Introduction to JPA Framework
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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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