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Home > Programming > Application Development > Java Hibernate Cookbook
Java Hibernate Cookbook
Java Hibernate Cookbook

Java Hibernate Cookbook: Over 50 recipes to help you build dynamic and powerful real-time Java Hibernate applications

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Java Hibernate Cookbook

Chapter 2. Understanding the Fundamentals

In this chapter, we will cover the following recipes:

  • Building a SessionFactory
  • Creating a generic SessionFactory provider class
  • Opening a new session
  • Opening a stateless session
  • Saving an object to the database
  • Fetching an object from the database
  • Removing an object from the database
  • Updating an object
  • Creating a criteria
  • Restricting the results using a criteria
  • Pagination using a criteria
  • Sorting the results
  • Transforming a result
  • Using basic projection

Introduction

Before we proceed, it's necessary to learn about the fundamentals of hibernate: the classes and interfaces required.

In this chapter, we will cover the fundamentals of hibernate, such as SessionFactory, Session, and Criteria. We will discuss the importance of SessionFactory in the hibernate application. Criteria is used to do the actual transaction or the CRUD (Create, Read, Update, Delete) operation. Apart from this, we will cover some basic and useful functionalities, such as the sorting of results, limiting the number of rows, transforming a result, and the basics of projections.

Building a SessionFactory

First, we will discuss SessionFactory and how to create it in detail. As the name suggests, a SessionFactory is a factory of sessions.

A SessionFactory has the following features:

  • It's an interface implemented using the singleton pattern.
  • It's created using the configuration provided by the configuration file.
  • It's thread-safe, so it's created once during the application's lifetime, and multiple users or threads can access it at the same time without any concurrency issue.
  • As a SessionFactory object is immutable, changes made to the configuration will not affect the existing factory object.
  • It's a factory class, and its main duty is to create, manage, and retrieve a session on request. A Session is used to get a physical connectivity with the database.

How to do it…

If you are using a version of hibernate that is earlier than 4, use the following code to create a SessionFactory:

/* Line 1 */ Configuration cfg = new Configuration();
...

Creating a generic SessionFactory provider class

Now, we will create a helper class, which will help us to set and get SessionFactory on demand.

We require SessionFactory at every point while working with hibernate. So, we will create a HibernateUtil.java class.

Tip

This is just a naming convention and not a hibernate standard but is used globally by developers and communities for the ease of use.

How to do it…

Here, we will create a Java file with the name HibernateUtil.java:

  1. Enter the following code in the HibernateUtil.java file:
    import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
  private static final SessionFactory sessionFactory;
    
  static {
    try {
      // Create the SessionFactory from hibernate.cfg.xml
     sessionFactory = new Configuration().configure().buildSessionFactory();

      // Use code below for Hibernate version 4
      // Configuration configuration = new Configuration();
      // configuration = configuration...

Opening a new session

A Session is also known as an interface that is used to get a physical connectivity with a database. It is instantiated every time we need to interact with the database for the CRUD (Create, Read, Update, Delete) operations. Persistent objects always travel from the application to the database and vice versa only through the Session.

Now, let's find out more about Session and how to open a new Session using a SessionFactory.

Getting ready

Before we create a Session object, we need to get an object such as a SessionFactory as a prerequisite:

  1. Use the following code to open a new session:
    SessionFactory sessionFactory = HibernateUtil.getSessionFactory();

How to do it…

Now, we will open a new Session with the database:

Session session = sessionFactory.openSession();

Other methods are also available to open a Session, as shown in the following code:

Session openSession(org.hibernate.Interceptor interceptor);
Session openSession(java.sql.Connection connection, org.hibernate...

Opening a stateless session

Basically, a stateless session is used to perform only one task. It does not take place in any type of cache. A cache is used to store the frequently used objects in the current context. There are some cases where a stateless session is very useful; for example, if we are reading data from a file and inserting it into the database, we don't need to cache that data further because this is a one-time operation.

Apart from this, a stateless session does not use dirty checking while performing a transactional operation. The collections, as well as hibernate's event model and interceptors, are ignored by a stateless session.

How to do it…

Now, let's look at how to create a stateless session. It's the same as creating a session, but the method is different:

  1. Enter the following code to open a stateless session:
    SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openStatelessSession();

Saving an object to the database

Now, we have reached a point from where we start the actual transactional operations, such as insert, delete, update, and so on.

In this recipe, we will look at how to save an object to the database.

The equivalent SQL query is as follows:

  • Department: INSERT INTO department (deptName) VALUES ('department name');
  • Employee: INSERT INTO employee (firstName, salary, department) VALUES ('first name', salary value, department id);

How to do it…

Let's look at how to save an object to the database:

  1. The following code shows how we can save an object to the database:
    SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();

// begin a transaction 
session.getTransaction().begin(); 

//creating a department object
Department department = new Department();
department.setDeptName("developement");

// save department object
session.save(department); 
System.out.println("Department...

Introduction

Before we proceed, it's necessary to learn about the fundamentals of hibernate: the classes and interfaces required.

In this chapter, we will cover the fundamentals of hibernate, such as SessionFactory, Session, and Criteria. We will discuss the importance of SessionFactory in the hibernate application. Criteria is used to do the actual transaction or the CRUD (Create, Read, Update, Delete) operation. Apart from this, we will cover some basic and useful functionalities, such as the sorting of results, limiting the number of rows, transforming a result, and the basics of projections.

Building a SessionFactory

First, we will discuss SessionFactory and how to create it in detail. As the name suggests, a SessionFactory is a factory of sessions.

A SessionFactory has the following features:

  • It's an interface implemented using the singleton pattern.

  • It's created using the configuration provided by the configuration file.

  • It's thread-safe, so it's created once during the application's lifetime, and multiple users or threads can access it at the same time without any concurrency issue.

  • As a SessionFactory object is immutable, changes made to the configuration will not affect the existing factory object.

  • It's a factory class, and its main duty is to create, manage, and retrieve a session on request. A Session is used to get a physical connectivity with the database.

How to do it…

If you are using a version of hibernate that is earlier than 4, use the following code to create a SessionFactory:

/* Line 1 */ Configuration cfg = new Configuration();
/* Line 2 */ cfg = cfg.configure();
/*...

Creating a generic SessionFactory provider class

Now, we will create a helper class, which will help us to set and get SessionFactory on demand.

We require SessionFactory at every point while working with hibernate. So, we will create a HibernateUtil.java class.

Tip

This is just a naming convention and not a hibernate standard but is used globally by developers and communities for the ease of use.

How to do it…

Here, we will create a Java file with the name HibernateUtil.java:

  1. Enter the following code in the HibernateUtil.java file:

    import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {
  private static final SessionFactory sessionFactory;
    
  static {
    try {
      // Create the SessionFactory from hibernate.cfg.xml
     sessionFactory = new Configuration().configure().buildSessionFactory();

      // Use code below for Hibernate version 4
      // Configuration configuration = new Configuration();
      // configuration = configuration...

Opening a new session

A Session is also known as an interface that is used to get a physical connectivity with a database. It is instantiated every time we need to interact with the database for the CRUD (Create, Read, Update, Delete) operations. Persistent objects always travel from the application to the database and vice versa only through the Session.

Now, let's find out more about Session and how to open a new Session using a SessionFactory.

Getting ready

Before we create a Session object, we need to get an object such as a SessionFactory as a prerequisite:

  1. Use the following code to open a new session:

    SessionFactory sessionFactory = HibernateUtil.getSessionFactory();

How to do it…

Now, we will open a new Session with the database:

Session session = sessionFactory.openSession();

Other methods are also available to open a Session, as shown in the following code:

Session openSession(org.hibernate.Interceptor interceptor);
Session openSession(java.sql.Connection connection, org.hibernate.Interceptor...

Opening a stateless session

Basically, a stateless session is used to perform only one task. It does not take place in any type of cache. A cache is used to store the frequently used objects in the current context. There are some cases where a stateless session is very useful; for example, if we are reading data from a file and inserting it into the database, we don't need to cache that data further because this is a one-time operation.

Apart from this, a stateless session does not use dirty checking while performing a transactional operation. The collections, as well as hibernate's event model and interceptors, are ignored by a stateless session.

How to do it…

Now, let's look at how to create a stateless session. It's the same as creating a session, but the method is different:

  1. Enter the following code to open a stateless session:

    SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openStatelessSession();

Saving an object to the database

Now, we have reached a point from where we start the actual transactional operations, such as insert, delete, update, and so on.

In this recipe, we will look at how to save an object to the database.

The equivalent SQL query is as follows:

  • Department: INSERT INTO department (deptName) VALUES ('department name');

  • Employee: INSERT INTO employee (firstName, salary, department) VALUES ('first name', salary value, department id);

How to do it…

Let's look at how to save an object to the database:

  1. The following code shows how we can save an object to the database:

    SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();

// begin a transaction 
session.getTransaction().begin(); 

//creating a department object
Department department = new Department();
department.setDeptName("developement");

// save department object
session.save(department); 
System.out.println("Department saved, id:  " + department.getId()...

Fetching an object from the database

Now we will take a look at how to fetch objects using a Session. Here, we will also see how to get only one record using the primary key column. We override a toString() method in the Employee and Department classes so that it's easy to display the data within an object, as shown in the following code:

@Override
    public String toString() {
      return "\nEmployee"
      + "\n id: " + this.getId()
      + "\n first name: " + this.getFirstName()
      + "\n salary: " + this.getSalary()
      + "\n department: " + this.getDepartment().getDeptName();
    }

How to do it…

Here, we are trying to get an employee having id equals 1.

The equivalent SQL query is as follows:

SELECT * FROM employee WHERE id=1;

Now, let's look at how to do the same using hibernate:

  1. Enter the following code to fetch an object of the employee type, where the id is 1:

    SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session =  sessionFactory.openSession();
Employee...

Removing an object from the database

Now, we take a look at how to remove a record from the database.

How to do it…

Here, we are trying to remove an employee object having id equals 1.

The SQL query executed to achieve the same result is as follows:

DELETE FROM employee WHERE id=1;

Now, let's take a look at how to do the same using hibernate.

Code

Enter the following code to delete an object of the employee type, where id is 1:

SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();

session.getTransaction().begin();
Employee employee = (Employee) session.get(Employee.class, new Long(1));
session.delete(employee);
session.getTransaction().commit();

session.close(); 
HibernateUtil.shutdown();

Output

The output will be as follows:

Hibernate: select employee0_.id as id0_1_, employee0_.department as department0_1_, employee0_.firstName as firstName0_1_, employee0_.salary as salary0_1_, department1_.id as id1_0_, department1_.deptName as deptName1_0_...

Updating an object

Here, we look at how to get a record from the database and update the same record to the database. The main goal is to get Employee#2 and update the first name, aarush, to aarush_updated.

How to do it…

Here, we are trying to update an employee object having id equals 2.

The SQL query executed to achieve the same result is as follows:

UPDATE employee SET firstName='aarush_updated' WHERE id=2;

Now, let's take a look at how to do the same using hibernate.

Code

Enter the following code to update an object of the employee type, where id is 2:

SessionFactory sessionFactory = HibernateUtil.getSessionFactory();
Session session = sessionFactory.openSession();

/* Line 3 */ Employee employee = (Employee) session.get(Employee.class, new Long(2));

System.out.println("\nOld Employee...");
System.out.println(employee.toString());

session.getTransaction().begin();
/* Line 9 */ employee.setFirstName("aarush_updated");
/* Line 10 */ session.update(employee);
session.getTransaction().commit...
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Page 1 of 16

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Key benefits

  • Learn to associate JDBC and Hibernate with object persistence
  • Manage association mappings, implement basic annotations and learn caching
  • Get to grips with Hibernate fundamentals from installation to developing a business application with this step-by-step guide

Description

This book will provide a useful hands-on guide to Hibernate to accomplish the development of a real-time Hibernate application. We will start with the basics of Hibernate, which include setting up Hibernate – the pre-requisites and multiple ways of configuring Hibernate using Java. We will then dive deep into the fundamentals of Hibernate such as SessionFactory, session, criteria, working with objects and criteria. This will help a developer have a better understanding of how Hibernate works and what needs to be done to run a Hibernate application. Moving on, we will learn how to work with annotations, associations and collections. In the final chapters, we will see explore querying, advanced Hibernate concepts and integration with other frameworks.

Who is this book for?

This is book for Java developers who now want to learn Hibernate. Good knowledge and understanding of Java is preferred to allow efficient programming of the core elements and applications; it would be helpful if readers are familiar with the basics of SQL.

What you will learn

  • Set up and install Hibernate on your system and explore different ways in which Hibernate can be configured
  • Learn the basic concepts and fundamentals of Java Hibernate
  • Define mappings without a use of XML file using Annotations
  • Persist collection elements such as list, map, set and array
  • Explore the various mapping options and learn to work with Hibernate associations
  • Understand advanced Hibernate concepts such as caching and inheritance
  • Develop an engaging and robust real-world hibernate application based on a common business scenario
  • Integrate Hibernate with other frameworks to develop robust enterprise applications

Product Details

Country selected
Publication date, Length, Edition, Language, ISBN-13
Publication date : Sep 18, 2015
Length: 250 pages
Edition : 1st
Language : English
ISBN-13 : 9781784398408
Vendor :
Oracle
Category :
Programming
Languages :
Java
Concepts :
Application Development
Tools :
Hibernate

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Product Details

Publication date : Sep 18, 2015
Length: 250 pages
Edition : 1st
Language : English
ISBN-13 : 9781784398408
Vendor :
Oracle
Category :
Programming
Languages :
Java
Concepts :
Application Development
Tools :
Hibernate

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Table of Contents

9 Chapters
1. Setting Up Hibernate Chevron down icon Chevron up icon
1. Setting Up Hibernate
Introduction
Getting the required libraries for hibernate
Creating a hibernate persistent class
Providing an XML-based hibernate mapping
Providing an annotation-based hibernate mapping
Providing a hibernate configuration using an XML file
Providing a hibernate configuration using the properties file
Configuring hibernate programmatically
2. Understanding the Fundamentals Chevron down icon Chevron up icon
2. Understanding the Fundamentals
Introduction
Building a SessionFactory
Creating a generic SessionFactory provider class
Opening a new session
Opening a stateless session
Saving an object to the database
Fetching an object from the database
Removing an object from the database
Updating an object
Creating a criteria
Restricting the results using a criteria
Pagination using a criteria
Sorting the results
Transforming a result
Using basic projection
3. Basic Annotations Chevron down icon Chevron up icon
3. Basic Annotations
Introduction
Declaring a class as an entity and creating a table in the database – @Entity and @Table
Creating a column in the table – @Column
Creating a primary key and composite primary key column – @Id and @IdClass
Creating an autogenerator column
4. Working with Collections Chevron down icon Chevron up icon
4. Working with Collections
Introduction
Persisting List
Persisting Set
Persisting Map
Persisting Array
5. Working with Associations Chevron down icon Chevron up icon
5. Working with Associations
Introduction
One-to-one mapping using foreign key association
One-to-one mapping using a common join table
One-to-one mapping using a common primary key
One-to-many mapping or many-to-one mapping
Many-to-many mapping
6. Querying Chevron down icon Chevron up icon
6. Querying
Introduction
Working with an alias
Performing aggregate operations
Executing a subquery using a criteria
Executing a native SQL query
Executing a query using HQL
Using formula in hibernate
Working with NamedQuery
7. Advanced Concepts Chevron down icon Chevron up icon
7. Advanced Concepts
Introduction
Working with a first-level cache
Working with a second-level cache
Working with a query cache
Working with the table per class hierarchy strategy of inheritance
Working with the table per subclass strategy of inheritance
Working with the table per concrete class strategy of inheritance
Working with the versioning of objects
Maintaining the history of an object
Working with an interceptor
Working with batch processing
8. Integration with Other Frameworks Chevron down icon Chevron up icon
8. Integration with Other Frameworks
Introduction
Integration with Spring
Integration with Struts
Index Chevron down icon Chevron up icon
Index

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About the authors

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Profile icon Prajapati
Prajapati
Yogesh Prajapati is a Java programmer. He has more than 4 years of experience in implementing enterprise web applications using J2EE technologies. Yogesh has experience in technologies and frameworks such as Spring, Hibernate, RESTful web services, and MongoDB. He pursued a BCA from Ganpat University, Kherva, Gujarat, India. In 2011, Yogesh obtained a master's degree in computer application from Gujarat University, Gujarat, India. His expertise is not limited to a particular domain; he has worked with clients in the transportation, finance, and health care domains. Apart from this, he has experience in GIS development and has also worked in the hospitality industry. He shares his knowledge of Java and other technologies through blogging. He is interested in contributing to open source technologies and is enthusiastic about building new products and services.
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Profile icon Ranapariya
Ranapariya
Vishal Ranapariya is a Java developer. He has more than 4 years of experience in implementing enterprise web applications using J2EE technology. He has experience with technologies and frameworks such as Java, J2EE, Spring, Hibernate, RESTful web services, MongoDB, and Core Hadoop. Vishal pursued a BCA from Gujarat University, Gujarat, India. In 2011, he obtained a master's degree in computer application from Gujarat University, Gujarat, India. Vishal has blogs at http://kode12.com, where he shares his knowledge of Java-related open source technologies. He is interested in contributing to open source technologies. Vishal is enthusiastic about building new products and services. You can follow Vishal on his blog and on LinkedIn at https://in.linkedin.com/in/vishalranapariya.
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