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Building a SessionFactory This is an example of a typical Hibernate startup procedure, in one line of code, using automatic configuration file detection:
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SessionFactory sessionFactory = new Configuration().configure().buildSessionFactory();
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Wait how did Hibernate know where the configuration file was located and which one to load When new Configuration() is called, Hibernate searches for a file named hibernate.properties in the root of the classpath. If it s found, all hibernate.* properties are loaded and added to the Configuration object. When configure() is called, Hibernate searches for a file named hibernate.cfg.xml in the root of the classpath, and an exception is thrown if it can t be found. You don t have to call this method if you don t have this configuration file, of course. If settings in the XML configuration file are duplicates of properties set earlier, the XML settings override the previous ones. The location of the hibernate.properties configuration file is always the root of the classpath, outside of any package. If you wish to use a different file or to have Hibernate look in a subdirectory of your classpath for the XML configuration file, you must pass a path as an argument of the configure() method:
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SessionFactory sessionFactory = new Configuration() .configure("/persistence/auction.cfg.xml") .buildSessionFactory();
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Finally, you can always set additional configuration options or mapping file locations on the Configuration object programmatically, before building the SessionFactory:
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SessionFactory sessionFactory = new Configuration() .configure("/persistence/auction.cfg.xml") .setProperty(Environment.DEFAULT_SCHEMA, "CAVEATEMPTOR") .addResource("auction/CreditCard.hbm.xml") .buildSessionFactory();
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Many sources for the configuration are applied here: First the hibernate.properties file in your classpath is read (if present). Next, all settings from /persistence/ auction.cfg.xml are added and override any previously applied settings. Finally, an additional configuration property (a default database schema name) is set programmatically, and an additional Hibernate XML mapping metadata file is added to the configuration. You can, of course, set all options programmatically, or switch between different XML configuration files for different deployment databases. There is effectively no
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limitation on how you can configure and deploy Hibernate; in the end, you only need to build a SessionFactory from a prepared configuration.
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NOTE
Method chaining Method chaining is a programming style supported by many Hibernate interfaces. This style is more popular in Smalltalk than in Java and is considered by some people to be less readable and more difficult to debug than the more accepted Java style. However, it s convenient in many cases, such as for the configuration snippets you ve seen in this section. Here is how it works: Most Java developers declare setter or adder methods to be of type void, meaning they return no value; but in Smalltalk, which has no void type, setter or adder methods usually return the receiving object. We use this Smalltalk style in some code examples, but if you don t like it, you don t need to use it. If you do use this coding style, it s better to write each method invocation on a different line. Otherwise, it may be difficult to step through the code in your debugger.
Now that you know how Hibernate is started and how to build a SessionFactory, what to do next You have to create a configuration file for Hibernate. Creating an XML configuration file Let s assume you want to keep things simple, and, like most users, you decide to use a single XML configuration file for Hibernate that contains all the configuration details. We recommend that you give your new configuration file the default name hibernate.cfg.xml and place it directly in the source directory of your project, outside of any package. That way, it will end up in the root of your classpath after compilation, and Hibernate will find it automatically. Look at the file in listing 2.4.
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