Hibernate.org Community Documentation

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## Vorwort

Working with both Object-Oriented software and Relational Databases can be cumbersome and time consuming. Development costs are significantly higher due to a paradigm mismatch between how data is represented in objects versus relational databases. Hibernate is an Object/Relational Mapping solution for Java environments. The term Object/Relational Mapping refers to the technique of mapping data from an object model representation to a relational data model representation (and visa versa). See http://en.wikipedia.org/wiki/Object-relational_mapping for a good high-level discussion.

## Anmerkung

While having a strong background in SQL is not required to use Hibernate, having a basic understanding of the concepts can greatly help you understand Hibernate more fully and quickly. Probably the single best background is an understanding of data modeling principles. You might want to consider these resources as a good starting point:

- http://www.agiledata.org/essays/dataModeling101.html

- http://en.wikipedia.org/wiki/Data_modeling

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. It can significantly reduce development time otherwise spent with manual data handling in SQL and JDBC. Hibernate’s design goal is to relieve the developer from 95% of common data persistence-related programming tasks by eliminating the need for manual, hand-crafted data processing using SQL and JDBC. However, unlike many other persistence solutions, Hibernate does not hide the power of SQL from you and guarantees that your investment in relational technology and knowledge is as valid as always.

Hibernate may not be the best solution for data-centric applications that only use stored-procedures to implement the business logic in the database, it is most useful with object-oriented domain models and business logic in the Java-based middle-tier. However, Hibernate can certainly help you to remove or encapsulate vendor-specific SQL code and will help with the common task of result set translation from a tabular representation to a graph of objects.

Falls Ihnen Hibernate und Objekt/Relationales Mapping oder sogar Java neu sind, orientieren Sie sich bitte an folgenden Schritten:

1. Read Kapitel 1, Tutorial for a tutorial with step-by-step instructions. The source code for the tutorial is included in the distribution in the `doc/reference/tutorial/` directory.

2. Read Kapitel 2, Architektur to understand the environments where Hibernate can be used.

3. View the `eg/` directory in the Hibernate distribution. It contains a simple standalone application. Copy your JDBC driver to the `lib/` directory and edit `etc/hibernate.properties`, specifying correct values for your database. From a command prompt in the distribution directory, type `ant eg` (using Ant), or under Windows, type `build eg`.

4. Use this reference documentation as your primary source of information. Consider reading [JPwH] if you need more help with application design, or if you prefer a step-by-step tutorial. Also visit http://caveatemptor.hibernate.org and download the example application from [JPwH].

5. Antworten auf häufig gestellte Fragen (FAQs) finden Sie auf der Website von Hibernate.

6. Auf der Hibernate Website befinden sich auch Demos, Beispiele und Anleitungen Dritter.

7. Bei Fragen wenden Sie sich an das Benutzerforum, das mit der Hibernate Website verlinkt ist. Wir bieten auch ein JIRA-Problemverfolgungssystem für Fehlerberichte und Feature-Anfragen. Falls Sie an der Entwicklung von Hibernate interessiert sind, registrieren Sie sich bei der Mailing-Liste für Entwickler. Falls Sie diese Dokumentation in Ihre Sprache übersetzen möchten, setzen Sie sich mittels der Mailing-Liste für Entwickler mit uns in Verbindung.

There are a number of ways to become involved in the Hibernate community, including

- Trying stuff out and reporting bugs. See http://hibernate.org/issuetracker.html details.

- Trying your hand at fixing some bugs or implementing enhancements. Again, see http://hibernate.org/issuetracker.html details.

- http://hibernate.org/community.html list a few ways to engage in the community.

  - There are forums for users to ask questions and receive help from the community.

  - There are also IRC channels for both user and developer discussions.

- Helping improve or translate this documentation. Contact us on the developer mailing list if you have interest.

- Evangelizing Hibernate within your organization.

Copyright © 2004 Red Hat, Inc.

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