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What is Hibernate?
Hibernate 3.0, the latest Open Source persistence technology at the heart of
J2EE EJB 3.0 is available for download from
Hibernet.org.The
Hibernate 3.0 core is 68,549 lines of Java code together with 27,948 lines of
unit tests, all freely available under the LGPL, and has been in development for
well over a year. Hibernate maps the Java classes to the database tables. It
also provides the data query and retrieval facilities that significantly reduces
the development time. Hibernate is not the best solutions for data centric
applications that only uses the stored-procedures to implement the business
logic in database. It is most useful with object-oriented domain modes and
business logic in the Java-based middle-tier. Hibernate allows transparent
persistence that enables the applications to switch any database. Hibernate can
be used in Java Swing applications, Java Servlet-based applications, or J2EE
applications using EJB session beans.
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Hibernate 3.0 provides three full-featured query
facilities: Hibernate Query Language, the newly enhanced Hibernate
Criteria Query API, and enhanced support for queries expressed in the
native SQL dialect of the database.
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Filters for working with temporal (historical), regional
or permissioned data.
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Enhanced Criteria query API: with full support for
projection/aggregation and subselects.
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Runtime performance monitoring: via JMX or local Java
API, including a second-level cache browser.
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Eclipse support, including a suite of Eclipse plug-ins
for working with Hibernate 3.0, including mapping editor, interactive query
prototyping, schema reverse engineering tool.
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Hibernate is Free under LGPL: Hibernate can be used to
develop/package and distribute the applications for free.
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Hibernate is Scalable: Hibernate is very performant and
due to its dual-layer architecture can be used in the clustered
environments.
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Less Development Time: Hibernate reduces the development
timings as it supports inheritance, polymorphism, composition and the Java
Collection framework.
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Automatic Key Generation: Hibernate supports the
automatic generation of primary key for your.
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JDK 1.5 Enhancements: The new JDK has been
released as a preview earlier this year and we expect a slow migration to
the new 1.5 platform throughout 2004. While Hibernate3 still runs perfectly
with JDK 1.2, Hibernate3 will make use of some new JDK features. JSR 175
annotations, for example, are a perfect fit for Hibernate metadata and we
will embrace them aggressively. We will also support Java generics, which
basically boils down to allowing type safe collections.
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EJB3-style persistence operations: EJB3 defines the create()
and merge() operations, which are slightly different to Hibernate's saveOrUpdate() and saveOrUpdateCopy()
operations. Hibernate3 will support all four operations as methods of the
Session interface.
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Hibernate XML binding enables data to
be represented as XML and POJOs
interchangeably.
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The EJB3 draft specification support for POJO
persistence and annotations.
Detailed features are available at
http://www.hibernate.org/About/RoadMap.
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