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Next, a name that can be easily referenced later, project.classpath, is defined as a shortcut to all libraries in the library directory of the project. Another shortcut for a pattern that will come in handy is defined as meta.files. You need to handle configuration and metadata files separately in the processing of the build, using this filter. The clean target removes all created and compiled files, and cleans the project. The last three targets, compile, copymetafiles, and run, should be selfexplanatory. Running the application depends on the compilation of all Java source files, and the copying of all mapping and property configuration files to the build directory. Now, execute ant compile in your WORKDIR to compile the Hello World application. You should see no errors (nor any warnings) during compilation and find your compiled class files in the bin directory. Also call ant copymetafiles once, and check whether all configuration and mapping files are copied correctly into the bin directory. Before you run the application, start the database management system and export a fresh database schema. Starting the HSQL database system Hibernate supports more than 25 SQL database management systems out of the box, and support for any unknown dialect can be added easily. If you have an existing database, or if you know basic database administration, you can also replace the configuration options (mostly connection and dialect settings) you created earlier with settings for your own preferred system. To say hello to the world, you need a lightweight, no-frills database system that is easy to install and configure. A good choice is HSQLDB, an open source SQL database management system written in Java. It can run in-process with the main application, but in our experience, running it stand-alone with a TCP port listening for connections is usually more convenient. You ve already copied the hsqldb.jar file into the library directory of your WORKDIR this library includes both the database engine and the JDBC driver required to connect to a running instance. To start the HSQLDB server, open up a command line, change into your WORKDIR, and run the command shown in figure 2.4. You should see startup messages and finally a help message that tells you how to shut down the database system (it s OK to use Ctrl+C). You ll also find some new files in your WORKDIR, starting with test these are the files used by HSQLDB to store your data. If you want to start with a fresh database, delete the files between restarts of the server.
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You now have an empty database that has no content, not even a schema. Let s create the schema next. Exporting the database schema You can create the database schema by hand by writing SQL DDL with CREATE statements and executing this DDL on your database. Or (and this is much more convenient) you can let Hibernate take care of this and create a default schema for your application. The prerequisite in Hibernate for automatic generation of SQL DDL is always a Hibernate mapping metadata definition, either in XML mapping files or in Java source-code annotations. We assume that you ve designed and implemented your domain model classes and written mapping metadata in XML as you followed the previous sections. The tool used for schema generation is hbm2ddl; its class is org.hibernate. tool.hbm2ddl.SchemaExport, so it s also sometimes called SchemaExport. There are many ways to run this tool and create a schema:
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You can run <hbm2ddl> in an Ant target in your regular build procedure. You can run SchemaExport programmatically in application code, maybe in your HibernateUtil startup class. This isn t common, however, because you rarely need programmatic control over schema generation. You can enable automatic export of a schema when your SessionFactory is built by setting the hibernate.hbm2ddl.auto configuration property to create or create-drop. The first setting results in DROP statements followed by CREATE statements when the SessionFactory is built. The second setting adds additional DROP statements when the application is shut down and the SessionFactory is closed effectively leaving a clean database after every run.
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