Master JPA using Hibernate as the implementation. Learn the basics of JPA - entities, relationships, entity manager, annotations, JPQL and Criteria API. Take a step into the advanced world of JPA - caching, performance tuning(n + 1 queries), mapping inheritance hierarchies. Get a peek into the magic of Spring Data JPA & Spring Data Rest.
The Java Persistence API provides Java developers with an api for mapping java objects to relational data. In this course, you will learn about the JPA API, JPQL (Java Persistence query language), Java Persistence Criteria API and how you can perform ORM (Object Relational Mapping) with JPA.
Hibernate is the most popular implementation of JPA. It was the most popular ORM framework option before JPA emerged and it provides additional features on top of JPA. We will use Hibernate as the implementation in this course.
- You will learn the basics of JPA and Hibernate - Entities, Relationships, Inheritance Mappings and Annotations
- You will understand approaches to querying data using JPA and Hibernate - JPQL, Criteria API and Native Queries
- You will understand JPA and Hibernate Relationships in depth - One to One, Many to One and Many to Many
- You will use a variety of Spring Boot Starters - Spring Boot Starter Web, Starter Data Jpa, Starter Test
- You will learn the basic of performance tuning your JPA application with Hibernate - Solve N+1 Queries Issue.
- You will learn the basics of caching - First Level Cache and Second Level Cache with EhCache
- You will understand the basics of Spring Data JPA and Spring Data REST
- You should have working knowledge of Java and Annotations.
- We will help you install Eclipse and get up and running with Maven and Tomcat.
Refer each section
Spring Boot makes it easy to switch databases! Yeah really simple.
- Install MySQL and Setup Schema
- Remove H2 dependency from pom.xml
- Add MySQL (or your database) dependency to pom.xml
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>- Configure application.properties
spring.jpa.hibernate.ddl-auto=none
spring.datasource.url=jdbc:mysql://localhost:3306/person_example
spring.datasource.username=personuser
spring.datasource.password=YOUR_PASSWORD- Restart the app and You are ready!
Spring Boot can setup the database for you using Hibernate
Things to note:
- Spring Boot chooses a default value for you based on whether it thinks your database is embedded (default create-drop) or not (default none).
spring.jpa.hibernate.ddl-autois the setting to perform SchemaManagementTool actions automatically- none : No action will be performed.
- create-only : Database creation will be generated.
- drop : Database dropping will be generated.
- create : Database dropping will be generated followed by database creation.
- validate : Validate the database schema
- update : Update the database schema
- Reference : https://docs.jboss.org/hibernate/orm/5.2/userguide/html_single/Hibernate_User_Guide.html#configurations-hbmddl
application.properties
#none, validate, update, create, create-drop
spring.jpa.hibernate.ddl-auto=create
- Install MySQL https://dev.mysql.com/doc/en/installing.html
- More details - http://www.mysqltutorial.org/install-mysql/
- Trouble Shooting - https://dev.mysql.com/doc/refman/en/problems.html
- Startup the Server (as a service)
- Go to command prompt (or terminal)
- Execute following commands to create a database and a user
mysql --user=user_name --password db_name
create database person_example;
create user 'personuser'@'localhost' identified by 'YOUR_PASSWORD';
grant all on person_example.* to 'personuser'@'localhost';
- Execute following sql queries to create the table and insert the data
Table
create table person
(
id integer not null,
birth_date timestamp,
location varchar(255),
name varchar(255),
primary key (id)
);
Data
INSERT INTO PERSON (ID, NAME, LOCATION, BIRTH_DATE ) VALUES(10001, 'Ranga', 'Hyderabad',sysdate());
INSERT INTO PERSON (ID, NAME, LOCATION, BIRTH_DATE ) VALUES(10002, 'James', 'New York',sysdate());
INSERT INTO PERSON (ID, NAME, LOCATION, BIRTH_DATE ) VALUES(10003, 'Pieter', 'Amsterdam',sysdate());- Installation Video : https://www.youtube.com/playlist?list=PLBBog2r6uMCSmMVTW_QmDLyASBvovyAO3
- GIT Repository For Installation : https://github.com/in28minutes/getting-started-in-5-steps
- PDF : https://github.com/in28minutes/SpringIn28Minutes/blob/master/InstallationGuide-JavaEclipseAndMaven_v2.pdf
- Download the zip or clone the Git repository.
- Unzip the zip file (if you downloaded one)
- Open Command Prompt and Change directory (cd) to folder containing pom.xml
- Open Eclipse
- File -> Import -> Existing Maven Project -> Navigate to the folder where you unzipped the zip
- Select the right project
- Choose the Spring Boot Application file (search for @SpringBootApplication)
- Right Click on the file and Run as Java Application
- You are all Set
- For help : use our installation guide - https://www.youtube.com/playlist?list=PLBBog2r6uMCSmMVTW_QmDLyASBvovyAO3
- At in28Minutes, we ask ourselves one question everyday. How do we help you learn effectively - that is more quickly and retain more of what you have learnt?
- We use Problem-Solution based Step-By-Step Hands-on Approach With Practical, Real World Application Examples.
- Our success on Udemy and Youtube (2 Million Views & 12K Subscribers) speaks volumes about the success of our approach.
- While our primary expertise is on Development, Design & Architecture Java & Related Frameworks (Spring, Struts, Hibernate) we are expanding into the front-end world (Bootstrap, JQuery, Angular JS).
- Best Courses are interactive and fun.
- Foundations for building high quality applications are best laid down while learning.
- Problem Solution based Step by Step Hands-on Learning
- Practical, Real World Application Examples.
- We use 80-20 Rule. We discuss 20% things used 80% of time in depth. We touch upon other things briefly equipping you with enough knowledge to find out more on your own.
- We will be developing a demo application in the course, which could be reused in your projects, saving hours of your effort.
- We love open source and therefore, All our code is open source too and available on Github.
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