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Sunday, January 23, 2011

Java Hibernate

HIBERNATE - Introduction to Hibernate

Hibernate is an open source object/relational mapping tool for Java. Hibernate lets you develop persistent classes following common Java idiom - including association, inheritance, polymorphism, composition and the Java collections framework.

Hibernate not only takes care of the mapping from Java classes to database tables (and from Java data types to SQL data types), but also provides data query and retrieval facilities and can significantly reduce development time otherwise spent with manual data handling in SQL and JDBC.

Hibernates goal is to relieve the developer from 95 percent of common data persistence related programming tasks.

Hibernate is Free Software. The LGPL license is sufficiently flexible to allow the use of Hibernate in both open source and commercial projects (see the LicenseFAQ for details). Hibernate is available for download at This tutorial aims to provide insight into Hibernate version 3.0RC and its usage
Some of the main features of hibernate are listed below and we have tried to explain some of them in detail later in this tutorial.

  Transparent persistence without byte code processing
    Transparent persistence
    JavaBeans style properties are persisted
    No build-time source or byte code generation / processing
    Support for extensive subset of Java collections API
    Collection instance management
    Extensible type system
    Constraint transparency
    Automatic Dirty Checking
    Detached object support
  Object-oriented query language
    Powerful object-oriented query language
    Full support for polymorphic queries
    New Criteria queries
    Native SQL queries
  Object / Relational mappings
    Three different O/R mapping strategies

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