Book Image

Java Hibernate Cookbook

By : Yogesh Prajapati, Vishal Ranapariya
Book Image

Java Hibernate Cookbook

By: Yogesh Prajapati, Vishal Ranapariya

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.
Table of Contents (15 chapters)
Java Hibernate Cookbook
About the Authors
About the Reviewers

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.


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

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

Employee employee = (Employee) session.get(Employee.class, new Long(1));



The output will be as follows:

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