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Java Hibernate Cookbook

Java Hibernate Cookbook

By : Prajapati, Ranapariya
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Java Hibernate Cookbook

Java Hibernate Cookbook

By: Prajapati, Ranapariya
Buy this Book

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

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 hibernate.properties, 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("hbm2ddl.auto", "update");
configuration.setProperties(properties);

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

configuration = configuration.addURL(java.net.URL 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.

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