Hibernate is a high-performance Object/Relational persistence and query service.Hibernate is free software that is distributed under the GNU Lesser General Public License. Hibernate solves object-relational impedance mismatch problem.
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The SQL code / statements in the application can be eliminated without writing complex JDBC / Entity Bean code. Distributed transaction can simply be performed by using ORM tools. Hibernate is an open source ORM tool and a robust framework to perform ORMapping.
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High Level abstraction obscuring what is happening under the hood.
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JDBC maps Java classes to database tables (and from Java data types to SQL data types) Hibernate automatically generates the SQL queries.
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High level view shows the Hibernate architecture, how the Hibernate application work and which steps following.
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1.5.1 Minimal Architecture

The "minimal" architecture has the application manage its own JDBC connections and provide those connections to Hibernate; additionally the application manages transactions for itself.
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1.5.2 Comprehensive Architecture

The "comprehensive" architecture abstracts the application away from the underlying JDBC/JTA APIs and allows Hibernate to manage the details.
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You need to follow several steps to configure hibernate with eclipse IDE. Firstly you have to download the hibernate jars and then add them to classpath of eclipse.
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1.6.1 Simple Example OF Hibernate

This is a simple example of hibernate in which you need to make several files to use hibernate framework.
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Hibernate is a persistence framework which is used to persist data from Java environment to database. Persistence is a process of storing the data to some permanent medium and retrieving it back at any point of time even after the application that had created the data ended.
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An instance of org.hibernate.cfg.Configuration represents an entire set of mappings of an application's Java types to an SQL database. The org.hibernate.cfg.Configuration is used to build an immutable org.hibernate.SessionFactory. The mappings are compiled from various XML mapping files.
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Object/relational mappings are usually defined in an XML document. The mapping document is designed to be readable and hand-editable.
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If you do any modifications all the changes will first applied to the object in session cache only .
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This hibernate example use annotations and log4j. In this example you need to make several files to use hibernate framework.
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Hibernate datatypes acts as a bridge between the java datatype and database datatype. Based on the dialect, hibernate choose the correct datatype while creating the table in database.
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1.12.1 Hibernate Datatypes Example

Hibernate datatype example show the use of date, locale and currency datatypes.
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Hibernate Query Language is known as HQL. It is a object oriented query language as similar to SQL [Structural Query Language]. HQL works on persistent object and their properties rather than tables and columns. HQL queries is converted into SQL queries to perform task in database
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Application architecture gives the detail structure of the application and layer used in application.
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1.14.1 DAO [Data Access Object]

Use DAO to separate Object-Relationship behavior from the rest of your project as it provide high level of data source abstraction. The DAO manages the connection with the data source to obtain and store data, data could be a persistence object.
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1.14.2 AbstractDAO

AbstractDAO is a super class of all other DAO that contains methods for CRUD operation, which are common to all sub DAO that is all DAO need these method to perform CRUD operation into database.
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Hibernate provides one of the methods is Criteria API which allows you to build up a criteria query object programmatically where you can apply filtration rules and logical conditions.
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Hibernate uses a fetching strategy to retrieve associated objects if the application needs to navigate the association. Fetch strategies can be declared in the O/R mapping metadata, or over-ridden by a particular HQL or Criteria query.
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1.16.1 Fetch-SELECT Strategies Example with Annotation

This example shows how Fetch-SELECT strategy work in hibernate and how it different from others fetching strategy.
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1.16.2 Fetch-JOIN Strategies Example with Annotation

This example shows how Fetch-JOIN strategy work in hibernate and how it different from others fetching strategy.
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1.16.3 batch-size="2" Strategies Example With Annotation

This example shows how batch-size=="2" strategy work in hibernate and how it different from others fetching strategy.
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1.16.4 Fetch-SUBSELECT Strategies Example with Annotation

This example shows how Fetch-SUBSELECT strategy work in hibernate and how it different from others fetching strategy.
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Hibernate use caching to maintain the performance of an application. The caching lie between the application and the database to avoid the number of hits to database, it provide better performance for critical applications.
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1.17.1 First-level Cache

The first-level cache is the Session cache and is a mandatory cache through which all requests must pass. The Session object keeps an object under its own power before committing it to the database.
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1.17.2 Second-level Cache

Second level cache is an optional cache and first-level cache will always be consulted before any attempt is made to locate an object in the second-level cache. The second-level cache can be configured on a per-class and per-collection basis and mainly responsible for caching objects across sessions.
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1.17.3 Query-level Cache

Hibernate also implements a cache for query result sets that integrates closely with the second-level cache. This is an optional feature and requires two additional physical cache regions that hold the cached query results and the timestamps when a table was last updated.
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This has hibernate related configurations table and other stuff related hibernate framework.
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