Reverse engineering a legacy database This target generates entity class source code with mapping annotations and a hibernate.cfg.xml file that lists these mapped classes. You can edit the Java source directly to customize the mapping, if the customization in helloworld.reveng.xml is too limited. Also note that all exporters rely on templates written in the FreeMarker template language. You can customize the templates in whatever way you like, or even write your own. Even programmatic customization of code generation is possible. The Hibernate Tools reference documentation shows you how these options are used. Other exporters and configurations are available with the Hibernate Tools: An replaces the regular if you want to read mapping metadata from annotated Java classes, instead of XML mapping files. Its only argument is the location and name of a hibernate. cfg.xml file that contains a list of annotated classes. Use this approach to export a database schema from annotated classes. An is equivalent to an , except that it can scan for annotated Java classes automatically on the class- path; it doesn t need a hibernate.cfg.xml file. The exporter can create additional Java source for a persistence layer, based on the data access object pattern. At the time of writing, the templates for this exporter are old and need updating. We expect that the finalized templates will be similar to the DAO code shown in chapter 16, section 16.2, Creating a persistence layer. The exporter generates HTML files that document the tables and Java entities.
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