Hibernate: A Developer's Notebook

3.1. Creating Persistent Objects

Let's start by creating some objects in Java and persisting them to the database, so we can see how they turn into rows and columns for us. Because of the way we've organized our mapping document and properties file, it's extremely easy to configure the Hibernate session factory and get things rolling.

To get started, set up the Hibernate environment and use it to turn some new Track instances into corresponding rows in the database table.

3.1.1. How do I do that?

This discussion assumes you've created the schema and generated Java code by following the examples in Chapter 2. If you haven't, you can start by downloading the examples archive from this book's web site, jumping in to the ch03 directory, and copying in the third-party libraries as instructed in Chapter 1. Once you've done that, use the commands ant codegen followed by ant schema to set up the generated Java code and database schema on which this example is based. As with the other examples, these commands should be issued in a shell/command window whose current working directory is the top of your project tree, containing Ant's build.xml file.

We'll start with a simple example class, CreateTest, containing the necessary imports and housekeeping code to bring up the Hibernate environment and create some Track instances that can be persisted using the XML mapping document we started with. The source is shown in Example 3-1.

The examples in most chapters build on the previous ones, so if you ...