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CHAPTER 4 OBJECT RELATIONAL MAPPING WITH HIBERNATE
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Figure 4-2. How Hibernate works
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The Hibernate Session
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The Hibernate Session embodies the concept of a persistence service (or persistence manager) that can be used to query and perform insert, update, and delete operations on instances of a class mapped by Hibernate. In an ORM tool you perform all of these interactions using objectoriented semantics; that is, you no longer are referring to tables and columns, but you use Java classes and object properties. As its name implies, the Session is a short-lived, lightweight object used as a bridge during a conversation between the application and the database. The Session wraps the underlying JDBC connection or J2EE data source, and it serves as a first-level cache for persistent objects bound to it.
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The Session Factory
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Hibernate requires that you provide it with the information required to connect to each database being used by an application as well as which classes are mapped to a given database. Each one of these database-specific configuration files, along with the associated class mappings, are compiled and cached by the SessionFactory, which is used to retrieve Hibernate Sessions. The SessionFactory is a heavyweight object that should ideally be created only once (since it is an expensive and slow operation) and made available to the application code that needs to perform persistence operations.
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CHAPTER 4 OBJECT RELATIONAL MAPPING WITH HIBERNATE
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Each SessionFactory is configured to work with a certain database platform by using one of the provided Hibernate dialects. If you are prototyping an application you ll likely start with a database system you can easily install and run on your own machine. In my case this is usually MySQL, PostgreSQL or one of the flavors of pure embedded open source Java databases like HSQLDB. Most of us eventually have to migrate our schemas to an enterprise RDBMS such as Oracle, Sybase, or DB2. With its pluggable database architecture, Hibernate can make porting your application from database to database as simple as changing a few parameters in an XML file. The choice of Hibernate dialect is important when it comes to using databasespecific features like native primary key generation schemes or Session locking. At the time of this writing Hibernate (version 3.1) supports 22 database dialects. Each of the dialect implementations are in the package org.hibernate.dialect. Figure 4-3 shows the available dialects.
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Figure 4-3. Hibernate dialects
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The Hibernate Object Mappings
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Hibernate specifies how each object state is retrieved and stored in the database via an XML configuration file. Hibernate mappings are loaded at startup and are cached in the SessionFactory. Each mapping specifies a variety of parameters related to the persistence lifecycle of instances of the mapped class such as: Primary key mapping and generation scheme Object-field-to-table-column mappings Associations/Collections Caching settings Custom SQL, store procedure calls, filters, parameterized queries, and more
CHAPTER 4 OBJECT RELATIONAL MAPPING WITH HIBERNATE
Persistence Lifecycle
The last piece of information that I wish I had obtained earlier in my work with Hibernate is an understanding of the Lifecycle of an object as it pertains to Hibernate. There are three possible states for a Hibernate mapped object. Understanding these states and the actions that cause state transitions will become very important when dealing with the more complex Hibernate problems. Figure 4-4 shows how different methods provided by the Hibernate Session transition a mapped object from state to state.
Figure 4-4. Persistence Lifecycle In the transient state, the object is not associated with a database table. That is, its state has not been saved to a table, and the object has no associated database identity (no primary key has been assigned). Objects in the transient state are non-transactional, meaning that they do not participate in the scope of any transaction bound to a Hibernate Session. After a successful invocation of the save or saveOrUpdate methods an object ceases to be transient and becomes persistent. The Session delete method (or a delete query) produces the inverse effect making a persistent object transient.
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