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9.3.4 Running hbm2java
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You can easily start hbm2java from the command line:
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java -cp classpath net.sf.hibernate.tool.hbm2java.CodeGenerator options mapping_files
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hbm2java supports two options: output sets the directory for generated code, and config can be used to set a configuration file. Each mapping file that should be
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included in the source generation process must be named explicitly. An Ant task might be more appropriate in most projects. Here s an example:
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<target name="codegen"> <taskdef name="hbm2java" classname="net.sf.hibernate.tool.hbm2java.Hbm2JavaTask" classpathref="class.path"/> <hbm2java config="codegen.cfg.xml" output="generated/src/"> <fileset dir="mappings/"> <include name="**/*.hbm.xml"/> </fileset> </hbm2java> </target>
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Using the toolset
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This target produces Java source files in the generated_src directory. hbm2java uses the codegen.cfg.xml file from the current directory as its configuration and reads all Hibernate mapping files from the mappings directory (and its subdirectories). Remember to provide a classpath reference to this task that includes not only the hibernate-tools.jar of the HibernateExtensions distribution but also the Hibernate core JAR and all required third-party libraries for Hibernate (and Velocity, if required). The hbm2java tool can significantly improve your application development process, especially if you have a large number of existing database tables and also automatically generate Hibernate mapping metadata from that schema. Generating the mapping metadata from a schema is the job of Middlegen.
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9.4 Existing schemas and Middlegen
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Many developers use Hibernate in projects with legacy databases and existing schemas. In those cases, you usually can t modify the schema for easier integration with Hibernate. SQL databases traditionally have problems with schema evolution; some products even have problems renaming a table column. If your only choice is to work with an existing schema, you may as well try to automatically generate Hibernate mapping metadata from that schema. Doing so is especially useful if the schema contains many tables (say, more than 50) and the application working with that data has to be up and running as early as possible (which is also usually the case). You can use Middlegen to generate a mapping skeleton from database metadata and then refine the mappings by hand. Middlegen isn t limited to Hibernate metadata; it can also generate EJB entity bean code or Struts actions and JSP code through its plugins architecture. However, we ll focus on the Hibernate plugin in this section. Middlegen also offers a nice GUI, so you can rearrange the tables and customize the metadata generation process graphically.
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9.4.1 Starting Middlegen
The preferred way to start Middlegen is with Ant, using the bundled middlegen.MiddlegenTask. As always, you declare it in the build.xml after you copy the Middlegen core and Hibernate plugin JAR libraries to the classpath (Don t forget your JDBC driver!):
<taskdef name="middlegen" classname="middlegen.MiddlegenTask" classpathref="class.path"/>
Existing schemas and Middlegen
You can now use this middlegen task in whatever target you like and start the Middlegen GUI:
<middlegen appname="CaveatEmptor" prefsdir="${basedir}" gui="true" databaseurl="jdbc:oracle:thin:@localhost:1521:orac" driver="oracle.jdbc.driver.OracleDriver" username="test" password="test" schema="auction"> <hibernate destination="generated/src" package="org.hibernate.auction.model"/> </middlegen>
The previous example shows the minimum configuration options for Middlegen with the Hibernate plugin. You have to specify the database connection settings, such as JDBC driver, database URL, and login. The schema name is also important; otherwise, Middlegen will use all tables the user has access to, not only the tables owned by the user/schema. Middlegen saves the user s preferences (settings such as the position of the tables in the graphical interface and customization options); it uses the base directory of your project as the save path. The name of the preferences file is the same as the application name: in this case, CaveatEmptor-prefs.properties. Finally, you configure the Hibernate plugin. You have to set the target directory for the generated mapping files. In this example, we use the same directory that we might later use for the generated POJO source files (with hbm2java), so XML mapping files and persistent classes are in the same path. The package setting is used for all classes in the mapping metadata. Executing this target with Ant starts Middlegen. After automatically connecting to the local Oracle database, Middlegen reads the schema metadata and shows a graphical interface. This interface has a view of the database tables in the top half and a dialog with various options at the bottom. Figure 9.2 shows the table view. If you start Middlegen for the first time (without an existing configuration), the tables and relationships in the overview may look chaotic. Some manual work is required to get a good overview; luckily this must be done only once, because Middlegen saves the layout in the preferences. You can click and drag tables in the view and also select relationships for further customization (see the highlighted relationship between CATEGORY and CATEGORY_ITEM). After some work, we get a view of the CaveatEmptor database as shown in the figure; notice that the canvas extends to the right side with all other tables and relationships that have been found in our schema.
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