Beginning Hibernate: From Novice to Professional by Jeffrey Sambells, Michael Purvis, Cameron Turner

By Jeffrey Sambells, Michael Purvis, Cameron Turner

starting Hibernate is perfect if youre skilled in Java with databases (the conventional, or "connected," approach), yet are new to open resource light-weight Hibernatethe most well-liked de facto object-relational mapping and database-oriented program improvement framework. This e-book packs in fresh information regarding the newest unencumber of the Hibernate 3.2.x endurance layer and offers a transparent advent to the present ordinary for object-relational patience in Java.

Experienced writer Dave Minter and contributor Jeff Linwood offer extra in-depth examples than the other books for Hibernate newbies. The authors additionally current fabric in a full of life, example-based mannernot in a dry, theoretical, hard-to-read style. and because the ebook retains its concentrate on Hibernate with out losing time on nonessential third-party instruments, youll be capable of instantly begin development transaction-based engines and applications.

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Example text

SQL Dialects JDBC abstracts away many of the underlying connection details for each relational database, yet every relational database supports a different set of features and uses a slightly different version of SQL. Among the features that differ between relational databases are the syntax for marking identity columns, column data types, available SQL functions, foreign key constraint syntax, limits, GUID support, and support for cascade deletes. Hibernate abstracts away all of these changes into dialect classes.

We discuss mapping file configuration in the next section and caching in Chapter 9. After placing your XML configuration file in the root directory of the classpath, you will need to call one of the configure() methods on your application’s Configuration object. xml), you can call configure() with no arguments. If you used a different file name (for instance, because you have production, staging, user acceptance test, and development environments, with different databases), use one of the following methods on a Configuration object: • public Configuration configure(String) throws HibernateException: Loads the XML configuration from a resource accessible by the current thread’s context class loader • public Configuration configure(URL) throws HibernateException: Retrieves the XML configuration from a valid URL • public Configuration configure(File) throws HibernateException: Uses an XML configuration file on the file system Mapping Documents Once you have created your mapping documents for Hibernate, it needs to know where to find them.

You can call Hibernate from a Swing application, a servlet, a portlet, a JSP page, or any other Java application that has access to a database. Typically, you would use Hibernate to either create a data access layer for an application or replace an existing data access layer. Hibernate supports Java Management Extensions (JMX), J2EE Connector Architecture (JCA), and Java Naming and Directory Interface (JNDI) Java language standards. Using JMX, you can configure Hibernate while it is running. Hibernate may be deployed as a JCA connector, and you can use JNDI to obtain a Hibernate session factory in your application.

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