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Remember that this has to be an inverse collection mapping, so it doesn t support indexed collections. Now that you know all the association mapping techniques for normal entities, we still have to consider inheritance and associations to the various levels of an inheritance hierarchy. What we really want is polymorphic behavior. Let s see how Hibernate deals with polymorphic entity associations.

<copy todir="flat_source"> <fileset dir="src" includes="**/*.java"/> <mapper type="package" from="*.java" to="*.java" /> </copy>

Polymorphism is a defining feature of object-oriented languages like Java. Support for polymorphic associations and polymorphic queries is an absolutely basic feature of an ORM solution like Hibernate. Surprisingly, we ve managed to get this far without needing to talk much about polymorphism. Even more surprisingly, there is not much to say on the topic polymorphism is so easy to use in Hibernate that we don t need to spend a lot of effort explaining it. To get an overview, we first consider a many-to-one association to a class that may have subclasses. In this case, Hibernate guarantees that you can create links to any subclass instance just like you would to instances of the superclass.

For example, the file src/org/example/antbook/ant/lucene/HtmlDocumentTest.java is copied to output/org.example.antbook.ant.lucene. HtmlDocumentTest.java. The resulting file, of course, will not compile properly because <javac> expects classes to be in a directory hierarchy matching the package name, but it will present a different view of all of your source code.

Programmatic schema generation is straightforward:

We have covered the Ant datatypes that are frequently used by Ant tasks, but there are several other datatypes that are used by a smaller number of tasks. These datatypes are no less important, of course, when you need them for your build. Rather than provide detailed discussion of these types here, we show them with the appropriate tasks elsewhere in this book.

Configuration cfg = new Configuration().configure(); SchemaExport schemaExport = new SchemaExport(cfg); schemaExport.create(false, true);

A new SchemaExport object is created from a Configuration; all settings (such as the database driver, connection URL, and so on) are passed to the SchemaExport constructor. The create(false, true) call triggers the DDL generation process, without any SQL printed to stdout (because of the false setting), but with DDL immediately executed in the database (true). See the SchemaExport API for more information and additional settings. Your development process determines whether you should enable automatic schema export with the hibernate.hbm2ddl.auto configuration setting. Many new Hibernate users find the automatic dropping and re-creation on SessionFactory build a little confusing. Once you re more familiar with Hibernate, we encourage you to explore this option for fast turnaround times in integration testing. An additional option for this configuration property, update, can be useful during development: it enables the built-in SchemaUpdate tool, which can make schema evolution easier. If enabled, Hibernate reads the JDBC database metadata on startup and creates new tables and constraints by comparing the old schema with the current mapping metadata. Note that this functionality depends on the quality of the metadata provided by the JDBC driver, an area in which many drivers are lacking. In practice, this feature is therefore less exciting and useful than it sounds.

ZipFileset Building an archive that contains the contents of other archive files can be accomplished using the <zipfileset> datatype. A <zipfileset> not only allows putting the contents of one archive inside another, it also provides the capability to prefix an archives contents within another. For example, when building the WAR file for our search engine application, we incorporate the Javadoc HTML in an api subdirectory and our documentation under the help directory. These were not the directory names used during our build process, yet the WAR file will have these names in its structure.

We ve seen Hibernate users trying to use SchemaUpdate to update the schema of a production database automatically. This can quickly end in disaster and won t be allowed by your DBA.

<war destfile="dist/antbook.war" webxml="web.xml"> <classes dir="${build.classes.dir}"/> . . . <fileset dir="web"/> <zipfileset dir="${javadoc.dir}" prefix="api" /> <zipfileset dir="${build.dir}/webdocs" prefix="help"/> </war>

You can also run SchemaUpdate programmatically: