CHAPTER 2 Starting a project
org.hibernate.dialect.HSQLDialect
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true The document type declaration is used by the XML parser to validate this document against the Hibernate configuration DTD. Note that this isn t the same DTD as the one for Hibernate XML mapping files. Also note that we added some line breaks in the property values to make this more readable you shouldn t do this in your real configuration file (unless your database username contains a line break). First in the configuration file are the database connection settings. You need to tell Hibernate which database JDBC driver you re using and how to connect to the database with a URL, a username, and a password (the password here is omitted, because HSQLDB by default doesn t require one). You set a Dialect, so that Hibernate knows which SQL variation it has to generate to talk to your database; dozens of dialects are packaged with Hibernate look at the Hibernate API documentation to get a list. In the XML configuration file, Hibernate properties may be specified without the hibernate prefix, so you can write either hibernate.show_sql or just show_sql. Property names and values are otherwise identical to programmatic configuration properties that is, to the constants as defined in org.hibernate.cfg.Environment. The hibernate.connection.driver_class property, for example, has the constant Environment.DRIVER. Before we look at some important configuration options, consider the last line in the configuration that names a Hibernate XML mapping file. The Configuration object needs to know about all your XML mapping files before you build the SessionFactory. A SessionFactory is an object that represents a particular
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