Hibernate

Hibernate

Hibernate is an open source object relational mapping (ORM) tool that provides a framework to map object-oriented domain models to relational databases for web applications.
Zena  Sporer

Zena Sporer

1596961287

Hibernate Tutorial — 1. Setup & Configuration

In this post, I will talk about the stup and configuration of Hibernate, one of the most used Object-Relational Mapping (ORM) tool. I have already talked about what is ORM, what are the advantages and the drawbacks of using ORM in my previous post.
As recommended on the website of Hibernate, I will use Maven to setup Hibernate. Since the subject of my post is about Hibernate, I won’t be explaining Maven here. Also, I will use MySQL in the further examples as my choice of database.
First, we are opening a Maven project and in pom.xml file we are adding the necessary dependencies to use Hibernate.

#hibernate-maven #hibernate-configuration #hibernate-setup #hibernate

Hibernate Tutorial — 1. Setup & Configuration
Zena  Sporer

Zena Sporer

1596965016

Hibernate Tutorial — 2. Context & Entity

In this post, I will try to explain the context and entity terms that are used in the ORM technique in Hibernate. Also I will try to explain the basics of managing an entity within Hibernate.

In software development** persistence **is the term that refers to the information that keeps existing even after the application is not running anymore. Persistence context in Hibernate is the information related to the objects to be managed between the application and the database.

Hibernate manages the lifecycle of objects in the persistence context by being aware of their states and their relations to the persistence store. The persistence context act as a staging layer between the application and the database, once the transaction is committed in the application the changes are then applied to the database.

The managed objects in the context are called Entities. There are 4 states of entities in the persistence context.

  • new or **transient: **This is the initial state of the object and there are no representation for this object in the database yet.
  • managed or **persistent: **In this state, the entity is associated with the context and the entity represents a database table row.
  • **detached: **In this state, the entity still has a representation in the database but it is not managed by any context. This usually happens when we either close the session or clear its cache. The changes made to the data won’t affect the database since the entity is not managed by any context.
  • **removed: **In this state,theentity is marked for removal from the database by the managing context.

#hibernate-context #persistence-context #entity #hibernate-entity #hibernate-entitymanager

Hibernate Tutorial — 2. Context & Entity
Samanta  Moore

Samanta Moore

1623017160

Spring, Hibernate, EhCache Recipe

Integration of Spring and Hibernate with Second Level Cache (EhCache) is Demonstrated using a Simple Example. Check for Yourself the Positive Impact of a Second Level Cache in Hibernate.

A Simple Scenario explaining the Usage and Performance, when using EhCache (2nd Level Cache of along with Hibernate in a Spring environment. The performance results are taken using mySQL as the Database.

Though this Example is from Spring 2.5.x and Hibernate 3.x and EhCache 1.4, MySQL 5.0 => The Concepts Demonstrated will Continue to Hold Good for any Version of any Make of Second Level Cache Product with Hibernate (Optionally, Spring) such as Infinispan, Redis, Hazelcast, …

[Download Sample Code] Please be informed that the size is about 10MB; as i have provided all the dependencies.

In this example, I need to retrieve close to 5,000 records in a single fetch and then cache this information. As usual, setup Spring contexts in your Spring configuration file. I have just one class, which is a Hibernate DAO, _HibernateDoctorDAO.java. _The dependency injection hierarchy is dataSource **> **sessionFactory **> **hibernateTemplate. hibernateTemplate is then injected into the _HibernateDoctorDAO.java _at runtime by the Spring Framework.

#hibernate #j2ee #core java #java performance #ehcache #mysql ( 5 ) #data caching #java persistence #spring 2.5 #hibernate caching

Spring, Hibernate, EhCache Recipe
Gunjan  Khaitan

Gunjan Khaitan

1612339500

Hibernate Tutorial | Introduction To Hibernate In Java | Java Hibernate Tutorial

This video on “Java Hibernate” is based on the Java Hibernate framework. Java Hibernate is a light-weight, open-source, ORM tool. This video will help the beginners with a fully-fledged end-to-end explanation of the concepts with practical examples for a better understanding.

#hibernate #java #programming

Hibernate Tutorial | Introduction To Hibernate In Java | Java Hibernate Tutorial
Gunjan  Khaitan

Gunjan Khaitan

1612793883

Hibernate Full Course | Java Hibernate Full Course | Hibernate Tutorial For Beginners

This video on “Hibernate Tutorial for Beginners” will help you learn the fundamentals for Java Hibernate in detail. This Hibernate full course video will also include a practical session for a better learning experience.

  • 00:00:00 Hibernate Basics
  • 00:04:41 Hibernate ORM Features
  • 00:12:40: Hibernate project
  • 00:15:55 Hibernate Annotations
  • 00:17:13 Hibernate CRUD Operations
  • 00:17:54 HQL
  • 01:13:27 Native SQL query and Criterial Query
  • 01:16:10 Caching in Hibernate
  • 01:46:48 Transaction Management

#hibernate #java #programming #developer

Hibernate Full Course | Java Hibernate Full Course | Hibernate Tutorial For Beginners
Agnes  Sauer

Agnes Sauer

1598590440

What Is the Hi/Lo Algorithm?

1. Introduction

In this tutorial, we’ll explain the Hi/Lo Algorithm. It is used mostly as a database identifier generation strategy.

We’ll start with the algorithm overview. Then, we’ll show a practical example based on the Hibernate framework. Finally, we’ll discuss the algorithm’s use cases, its benefits, and its drawbacks.

2. Hi/Lo Algorithm Overview

2.1 Definition

The main purpose of the Hi/Lo algorithm is to create a range of numbers that can be safely used as database identifiers. In order to do that, it uses three number variables commonly called high, low, and incrementSize.

The incrementSize variable holds the maximum number of identifiers that can be generated in one batch. It should be treated as a constant value defined at the beginning of the algorithm. Any runtime modification might cause serious problems in environments where multiple clients use the same Hi/Lo configuration to persist entries.

The high variable is usually assigned from a database sequence. In that case, we’re sure that no one will get the same number twice.

The low variable holds the currently assigned number in the range [0_, incrementSize_).

Given these points, the Hi/Lo algorithm generates values in range [(_hi – 1) * incrementSize + 1, _(hi * incrementSize)).

#persistence #hibernate #hibernate

What Is the Hi/Lo Algorithm?
Lore Duran

Lore Duran

1582870620

Hibernate Tutorial For Beginners - Hibernate Full Course

  1. Introduction – 00:05
  2. Prerequisites for Hibernate – 02:13
  3. Hibernate Theory – 04:44
  4. Practical – 14:32
  5. How to add Hibernate Plugin in Eclipse – 26:27
  6. Configuration File – 28:07
  7. Working – 35:20
  8. Show SQL Property – 39:58
  9. Annotation – 43:21
  10. Fetching Data Using Hibernate – 48:08
  11. How to use Embeddable Object – 52:37
  12. Mapping Relations Theory – 01:00:32
  13. Mapping Relations Practical – 01:13:36
  14. Fetch EAGER LAZY – 01:29:04
  15. Hibernate Caching – 01:35:39
  16. Caching Level 1 – 01:44:09
  17. Caching Level 2 – 01:50:39
  18. Caching Level 2 with Query – 02:00:25
  19. Hibernate Query Language Theory (HQL) – 02:04:53
  20. Hibernate Query Language (HQL) part 1 – 02:09:03
  21. Hibernate Query Language (HQL) part 2 – 02:18:09
  22. Hibernate Query Language (HQL) part 3 – 02:26:58
  23. Hibernate Object States Persistence Life Cycle – 02:34:03
  24. Hibernate Object States (Practical) – 02:40:35
  25. Hibernate Get vs Load – 02:47:48
  26. What is JPA? & JPA Implementation – 02:53:17

#hibernate #java

Hibernate Tutorial For Beginners - Hibernate Full Course
Vern  Greenholt

Vern Greenholt

1598504121

What Is the Hi/Lo Algorithm?

1. Introduction

In this tutorial, we’ll explain the Hi/Lo Algorithm. It is used mostly as a database identifier generation strategy.

We’ll start with the algorithm overview. Then, we’ll show a practical example based on the Hibernate framework. Finally, we’ll discuss the algorithm’s use cases, its benefits, and its drawbacks.

2. Hi/Lo Algorithm Overview

2.1 Definition

The main purpose of the Hi/Lo algorithm is to create a range of numbers that can be safely used as database identifiers. In order to do that, it uses three number variables commonly called high, low, and incrementSize.

The incrementSize variable holds the maximum number of identifiers that can be generated in one batch. It should be treated as a constant value defined at the beginning of the algorithm. Any runtime modification might cause serious problems in environments where multiple clients use the same Hi/Lo configuration to persist entries.

The high variable is usually assigned from a database sequence. In that case, we’re sure that no one will get the same number twice.

The low variable holds the currently assigned number in the range [0_, incrementSize_).

Given these points, the Hi/Lo algorithm generates values in range [(_hi – 1) * incrementSize + 1, _(hi * incrementSize)).

#persistence #hibernate #hibernate

What Is the Hi/Lo Algorithm?

How to resolve Hibernate OutOfMemoryError problem - Hibernate Batch processing

https://grokonez.com/hibernate/resolve-hibernate-outofmemoryerror-problem-hibernate-batch-processing

How to resolve Hibernate OutOfMemoryError problem – Hibernate Batch processing

When using Hibernate for saving a large number of entities to database, You can meet an OutOfMemoryException. The tutorial will show the case and resolve it with Hibernate Batch processing.

Related articles:

I. Technologies

– Java 1.8 – Maven 3.3.9 – Spring Tool Suite – Version 3.8.1.RELEASE – Hibernate: 5.2.10.Final – MySql database

II. Problem & Solution

1. Problem

Using Hibernate to save 20000 entities to database as below code:

Session session = factory.openSession();
Transaction tx = null;
try {
	tx = session.beginTransaction();
for (int i = 0; i < 20000; i++) {
	String text = Utilities.generatedRandomString();
	Data data = new Data(text);
	session.save(data);
}

tx.commit();

} catch (Exception e) {
if (null != tx) {
tx.rollback();
}
} finally {
session.close();
}

https://grokonez.com/hibernate/resolve-hibernate-outofmemoryerror-problem-hibernate-batch-processing

How to resolve Hibernate OutOfMemoryError problem – Hibernate Batch processing

#hibernate #outofmemoryerror #batch

How to resolve Hibernate OutOfMemoryError problem - Hibernate Batch processing
Edureka Fan

Edureka Fan

1618842614

Hibernate Tutorial For Beginners | What Is Hibernate Framework | ORM | Java Training

This Edureka video on Hibernate Tutorial will provide you with detailed knowledge about Hibernate Framework and all the necessary fundamentals like ORM, Hibernate Architecture, components and a lot more. This informative Hibernate Tutorial will include the following:

  • 00:00:00 Introduction
  • 00:01:04 What is ORM Tool?
  • 00:02:05 Why Hibernate?
  • 00:03:24 What is Hibernate?
  • 00:03:51 Features of Hibernate
  • 00:05:31 Hibernate Architecture
  • 00:08:15 Core Components of Hibernate
  • 00:09:33 Hibernate ER Mapping
  • 00:11:09 Hands-on

#hibernate #java #programming #developer

Hibernate Tutorial For Beginners | What Is Hibernate Framework | ORM | Java Training

Table Per Class Example || inheritance Mapping In Hibernate || Java Hibernate Tutorial

In this tutorial, we will cover the first type of inheritance in hibernate which is table per class hierarchy and we will learn how to do hibernate inheritance mapping with a complete example.

This is a continuation video of my hibernate inheritance mapping series.

watch the first tutorial by clicking on the below link :

learn inheritance in hibernate like a pro || table per class hierarchy in hibernate || STEP BY STEP

https://youtu.be/vJcFJUQ0vrw

table per class hierarchy basically means we need to represent all our parent class and subclass data with a single table.We will separate the data by using a special column called discriminator column.

In our coming tutorial we do the following things:-

we will represent the data with table per class concept by using annotation.

so stay tuned.

follow us on facebook:
https://www.facebook.com/seleniumexpress/

Music :

credits : -

Adventures by A Himitsu https://soundcloud.com/a-himitsu
Creative Commons — Attribution 3.0 Unported— CC BY 3.0
http://creativecommons.org/licenses/b
Music released by Argofox https://youtu.be/8BXNwnxaVQE
Music provided by Audio Library https://youtu.be/MkNeIUgNPQ8

template :
wwww.youtube.com/Alexbau01

#hibernate #java

Table Per Class Example || inheritance Mapping In Hibernate || Java Hibernate Tutorial

Hibernate ORM PanacheEntity with PostgreSQL | Quarkus Tutorial | QUARKUS | JPA | Hibernate | Java

✅ How to use Hibernate ORM PanacheEntity with PostgreSQL | Quarkus Tutorial

⌚ Timestamps

  • 0:00 Introduction | Quarkus Tutorial
  • 0:10 Panache Entity | Quarkus Tutorial
  • 2:45 Quarkus Hibernate ORM Panache Maven dependency | Quarkus Tutorial
  • 3:45 Movie Panache Entity | Quarkus Tutorial
  • 5:20 Get All Movies Panache Entity | Quarkus Tutorial
  • 6:20 Get Movie By Id Panache Entity | Quarkus Tutorial
  • 8:20 Get Movie By Country Panache Entity | Quarkus Tutorial
  • 10:10 Get Movie By Title Panache Entity | Quarkus Tutorial
  • 12:00 Create Movie Panache Entity | Quarkus Tutorial
  • 14:30 Delete Movie Panache Entity | Quarkus Tutorial
  • 16:30 Docker PostgreSQL image | Quarkus Tutorial
  • 17:00 Quarkus Datasoruce Hibernate | Quarkus Tutorial
  • 19:05 Quarkus JDBC PostgreSQL Maven | Quarkus Tutorial
  • 24:05 GitHub Repository | Quarkus Tutorial

GitHub Repository: https://github.com/GiuseppeScaramuzzino/quarkus-hibernate-orm-panache-entity

#hibernate #postgresql #quarkus #java

Hibernate ORM PanacheEntity with PostgreSQL | Quarkus Tutorial | QUARKUS | JPA | Hibernate | Java
Fannie  Zemlak

Fannie Zemlak

1618201461

Hibernate vs. JPA

In this article, I would like to discuss the difference between Hibernate and JPA, and the use cases made of these technologies on (old and new) projects; the history is important.

Then we will deduce the orientations that we wish to give on modern projects.

A Bit of History

If you learned the web as I did in the early 2000s, you built your first PHP apps building personal pages. If you needed non-static content on your pages, then the host provided you with access to a PostgreSQL database. To interact with this database, we launched SQL queries from PHP, and voila.

Many of the new developers entering the market are not trained in SQL or relational basics, as if they no longer need to know this concept.

Indeed, in the meantime, procedural languages have become object-oriented, starting with the language of the Internet: PHP. As the object dominates the world, we have sought to abstract ourselves from the relational: the bases have also become objects. We thus speak of the principle of object-relational mapping, ORM. This approach assumes that objects exist in a programming language, that tables and relationships exist in a database, and that a mapping exists allowing the translation between the two universes.

#hibernate #jpa #java

Hibernate vs. JPA

Understand JPA and Hibernate

Understand JPA and Hibernate

A quick introduction about Java Persistence API (JPA) and Hibernate framework, with code example.

This is a preview of the course “Java Servlet, JSP and Hibernate: Build a Complete Website”.

Watch the full course here: https://www.codejava.net/java-servlet-jsp-and-hibernate-build-a-complete-website-1/

#jpa #hibernate #java #api

Understand JPA and Hibernate
Brooke  Giles

Brooke Giles

1607223600

A Guide to MultipleBagFetchException in Hibernate

In this tutorial, we’ll talk about the MultipleBagFetchException. We’ll begin with the necessary terms to understand, and then we’ll explore some workarounds until we reach the ideal solution.

We’ll create a simple music app’s domain to demonstrate each of the solutions.

#hibernate #java #programming #developer

A Guide to MultipleBagFetchException in Hibernate