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# Hibernate API Documentation (3.2.4.sp1.cp04)

Hibernate API

See:
Description

Core API
org.hibernate | This package defines the central Hibernate APIs.
org.hibernate.cfg | This package defines APIs for configuring Hibernate, and classes for building the Hibernate configuration-time metamodel.
org.hibernate.classic | This package implements backward-compatibility with Hibernate 2.1 APIs now deprecated in Hibernate3.
org.hibernate.criterion | A framework for defining restriction criteria and order criteria.
org.hibernate.metadata | This package defines an API for accessing the Hibernate runtime metamodel.
org.hibernate.usertype | Interfaces for user-defined custom types.

Extension API
org.hibernate.action | This package defines "actions" that are scheduled for asycnchronous execution by the event listeners.
org.hibernate.cache | This package defines APIs and implementations for the second-level cache and query cache.
org.hibernate.cache.entry | This package defines formats for disassembled state kept in the second level cache.
org.hibernate.collection | This package defines a framework for collection wrappers.
org.hibernate.connection | This package abstracts the mechanism for obtaining a JDBC connection.
org.hibernate.dialect | This package abstracts the SQL dialect of the underlying database.
org.hibernate.dialect.function | A framework for defining database-specific SQL functions that are available via the dialect.
org.hibernate.dialect.lock |
org.hibernate.event | This package defines an event framework for Hibernate.
org.hibernate.event.def | This package defines a default set of event listeners that implements the default behaviors of Hibernate.
org.hibernate.id | This package contains internal implementation classes for the main API interfaces.
org.hibernate.jdbc | This package abstracts the mechanism for dispatching SQL statements to the database, and implements interaction with JDBC.
org.hibernate.loader | This package defines functionality for processing JDBC result sets and returning complex graphs of persistent objects.
org.hibernate.loader.collection | This package defines collection initializers
org.hibernate.loader.criteria | This package defines the criteria query compiler and loader
org.hibernate.loader.custom | This package defines a framework for custom loaders that accept handwritten SQL
org.hibernate.loader.custom.sql |
org.hibernate.loader.entity | This package defines entity loaders
org.hibernate.loader.hql | This package defines a loader for the AST-based query parser
org.hibernate.persister | A persister defines a mapping strategy for a collection or entity.
org.hibernate.persister.collection | This package abstracts the persistence mechanism for collections.
org.hibernate.persister.entity | This package abstracts persistence mechanisms for entities, and defines the Hibernate runtime metamodel.
org.hibernate.property | This package abstracts the notion of a "property" of an entity.
org.hibernate.proxy | This package defines a framework for lazy-initializing entity proxies.
org.hibernate.transaction | This package abstracts the underlying transaction mechanism (JTA or JDBC) and provides strategies for obtaining application server `TransactionManager`s.
org.hibernate.transform | Defines strategies for post-processing criteria query result sets into a form convenient to the application.
org.hibernate.tuple | This package defines a runtime metamodel for entities at the object level and abstracts the differences between the various entity modes.
org.hibernate.type | A Hibernate `Type` is a strategy for mapping a Java property type to a JDBC type or types.

Miscellaneous API
org.hibernate.jmx | This package exposes a Hibernate instance via JMX.
org.hibernate.mapping | This package defines the Hibernate configuration-time metamodel.
org.hibernate.stat | This package exposes statistics about a running Hibernate instance to the application.
org.hibernate.tool.hbm2ddl | The `hbm2ddl` tool.
org.hibernate.tool.instrument | The `instrument` tool for adding field-interception hooks to persistent classes using built-time bytecode processing.

Internal Implementation
org.hibernate.engine | This package contains classes that are "shared" by other packages, and implementations of some key algorithms.
org.hibernate.exception | This package is a fork of Apache commons-lang nestable exceptions.
org.hibernate.hql | This package defines the interface between Hibernate and the HQL query parser implementation (to allow switching between the 2.x and 3.0 HQL parsers).
org.hibernate.hql.antlr | A special package for ANTLR-generated parser classes.
org.hibernate.hql.ast | An ANTLR-based parser for Hibernate Query Language.
org.hibernate.hql.classic | This package contains the Hibernate 2.x query parser which is being end-of-lifed.
org.hibernate.impl | This package contains implementations of the central Hibernate APIs, especially the Hibernate session.
org.hibernate.intercept | This package implements an interception mechanism for lazy property fetching, based on CGLIB bytecode instrumentation.
org.hibernate.lob | This package defines dummy and wrapper implementations of `java.sql.Clob` and `java.sql.Blob`.
org.hibernate.pretty | Classes for pretty printing things for exception and log messages.
org.hibernate.secure | Declarative security for CRUD operations on entities.
org.hibernate.sql | This package defines helper classes for rendering SQL fragments and SQL statements.
org.hibernate.util | Utility classes.

Other Packages
org.hibernate.bytecode | This package defines the API for plugging in bytecode libraries for usage by Hibernate.
org.hibernate.bytecode.cglib |
org.hibernate.bytecode.javassist |
org.hibernate.bytecode.util |
org.hibernate.context |
org.hibernate.engine.loading |
org.hibernate.engine.query |
org.hibernate.engine.query.sql |
org.hibernate.engine.transaction |
org.hibernate.hql.ast.exec |
org.hibernate.hql.ast.tree |
org.hibernate.hql.ast.util |
org.hibernate.id.enhanced |
org.hibernate.id.insert |
org.hibernate.intercept.cglib |
org.hibernate.intercept.javassist |
org.hibernate.param |
org.hibernate.proxy.dom4j |
org.hibernate.proxy.map |
org.hibernate.proxy.pojo |
org.hibernate.proxy.pojo.cglib |
org.hibernate.proxy.pojo.javassist |
org.hibernate.tool.instrument.cglib |
org.hibernate.tool.instrument.javassist |
org.hibernate.tuple.component |
org.hibernate.tuple.entity |

## Hibernate API

This documentation concentrates upon the following Core API interfaces:
- `org.hibernate.Hibernate`
- `org.hibernate.Session`
- `org.hibernate.SessionFactory`
- `org.hibernate.Transaction`
- `org.hibernate.Query`
- `org.hibernate.Criteria`
- `org.hibernate.ScrollableResults`
- `org.hibernate.cfg.Configuration`
- `org.hibernate.expression.Expression`
- `org.hibernate.expression.Order`
- `org.hibernate.expression.Example`
These interfaces are fully intended to be exposed to application code.
The Extension API is intended to be used by application programmers to extend Hibernate functionality. None of these interfaces are intended to be called by the application - they are called internally by Hibernate. This API is less stable than the Core API. The safest way to extend functionality is to contribute extensions back to the project; that way extensions will be updated when the Extension API changes.
Full Hibernate documentation may be found at hibernate.org.

See Also:
  `Hibernate`, `Session`, `SessionFactory`, `Transaction`, `Query`, `Criteria`, `ScrollableResults`, `Configuration`, `org.hibernate.expression.Expression`, `org.hibernate.expression.Order`, `org.hibernate.expression.Example`

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