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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

Providing a hibernate configuration using the properties file

This is another way to configure hibernate; here, we will create a file with the .properties extension. Usually called hibernate.properties, this file is a replacement for hibernate.cfg.xml. You can use any approach (either cfg.xml or the properties file). However, the properties file is better for startup, and it is the easiest approach to get started quickly.

This is a simpler representation of an XML file. Hibernate searches for the XML file or the properties file at startup to find the configuration in your classpath. We can use any one of these options. You can use both of them at the same time, but this is uncommon because hibernate gives priority to the XML file over properties; the properties file is simply ignored in such cases.

Note

The properties file looks similar to a normal text file, but the content should be in a key/value pair, which is Key=Value.

Here is an example: hibernate.connection.driver_class=com.mysql.jdbc.Driver.

How to do it…

Now, we will create a file called hibernate.properties in our classpath and write the following properties in the file. The following code represents hibernate.cfg.xml in the hibernate.properties file:

…
hibernate.dialect=org.hibernate.dialect.MySQLDialect
hibernate.connection.driver_class=com.mysql.jdbc.Driver
hibernate.connection.url=jdbc:mysql://localhost:3306/kode12
hibernate.connection.username=root
hibernate.connection.password=root
show_sql=true
hbm2ddl.auto=update
…

How it works…

When we create an instance of the Configuration class, it will look for hibernate.cfg.xml or hibernate.properties in our classpath. If we use a .properties file, it'll get all of the property defined in the file, rather than create a Configuration object.

Note

The difference between an XML and properties file is that, in an XML file, you can directly map classes using the <Mapping> tag, but there is no way to configure it in a properties file. So, you can use this methodology when you use a programmatic configuration.

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