Java Hibernate Cookbook

Java Hibernate Cookbook

Overview of this book

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.

Java Hibernate Cookbook

Credits

About the Authors

About the Reviewers

www.PacktPub.com

Preface

Free Chapter

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

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

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

Working with Collections

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

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

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

Integration with Other Frameworks

Introduction

Integration with Spring

Integration with Struts

Index

Customer Reviews

5 star

4 star

3 star

2 star

1 star

Introduction

In this chapter, we will take a look at how the hibernate and ORM (Object-relational Mapping) frameworks work, how to configure hibernate in different ways, and the libraries that are required for the hibernate application. An essential part of the application is the hibernate configuration. Through the configuration, we can provide database information to the hibernate engine, such as the database host, port, username, password, the database name, the drive class, and so on.

In the older era of Java development, developers used some methodologies to persist data. To persist data means to save or store data in some storage medium by maintaining it in a certain state. Once the data is successfully persisted, it can be used at any given time. A database is the more preferable storage medium for a transactional operation. Usually, we use JDBC (Java Database Connectivity) to perform such operation with the database.

If we use the JDBC operation, we need to work a bit harder and take care of the following processes:

Opening a database connection
Maintaining an open connection
Building a query
Executing a query
Getting a response to the query
Mapping the query response with the custom classes
Closing the database connection

To avoid this hectic process, we can use the ORM tools available in the market. ORM stands for Object Relation Mapping. It works as a bridge between the application and database by simplifying the communication between them.

The benefits of the ORM framework are as follows:

It reduces the development time/cost.
It speeds up the development.
It provides us with portability. Hibernate supports multiple databases, so there is no need to write a database-specific code.

This is a useful feature of hibernate. Generally, all databases have their own syntax made up of Data Definition Language (DDL) or Data Manipulation Language (DML) statements. If we used JDBC, we would need to write a database-specific code as our database is changed. However, hibernate gets rid of the developer's headache by handling this issue.

The syntax of a query may be different for different database parameters; still, hibernate works in the same way for all types of databases. Hibernate's term dialect helps achieve this type of functionality. The implementation of the dialect class is provided by the database provider to inform hibernate about the syntax of this particular database.

Some useful features of hibernate are as follows:

Code reusability
Transaction management
Efficient collection/custom classes mapping
The caching mechanism supported by hibernate

Java Hibernate Cookbook

Java Hibernate Cookbook

Overview of this book

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Java Hibernate Cookbook

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