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

Configuring hibernate programmatically

In the preceding section, we understood XML and the properties-based configuration. Hibernate also supports the programmatic configuration. To configure hibernate using this method, we have to work on a Java code and create an instance of the org.hibernate.cfg.Configuration class. There are multiple ways to configure hibernate.

How to do it…

First, write the following code:

Configuration configuration = new Configuration();

This will create an instance of the Configuration class using hibernate.cfg.xml or, whichever is found in the classpath.

Provide the following mapping files to the configuration:

configuration = configuration.addResource("Employee.hbm.xml");
configuration = configuration.addResource("Department.hbm.xml");

You can use an alternate way, as shown in the following code:

Configuration configuration = new Configuration().addResource("Employee.hbm.xml").addResource("Department.hbm.xml");

We can also provide a direct mapping using the class, as shown in the following code:

configuration = configuration.addClass("Department.class");

This will also look for Department.hbm.xml.

We can also set a custom property. To set up the custom property, use the following method:

configuration.setProperty(propertyName, value);

For example, consider the following code:

configuration.setProperty("show_sql", true);

To set up multiple properties using the properties object, execute the following code:

configuration.setProperties(java.util.Properties properties);

Here is an example:

Properties properties = new Properties();
properties.put("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
properties.put("hibernate.connection.driver_class", "com.mysql.jdbc.Driver");
properties.put("hibernate.connection.url", "jdbc:mysql://localhost:3306/kode12");
properties.put("hibernate.connection.username", "root");
properties.put("hibernate.connection.password", "root");
properties.put("show_sql", "true");
properties.put("", "update");

To read the mapping from the URL, you can use the following code:

configuration = configuration.addURL( url);

To read the mapping from the XML file, you can use the following code:

configuration = configuration.addXML(String xml);

How it works…

When we select the programmatic configuration option, the Configuration class is very important. Using the instance of the Configuration class, we will build a SessionFactory object, as shown in the following code:

SessionFactory sessionFactory = new Configuration().buildSessionFactory();

When the preceding code is executed, it creates a SessionFactory object using a .properties or .cfg file or whichever source is provided to create the configuration.