Hibernate

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ORM goal: Take advantage of the things SQL
databases do well, without leaving the Java language of
objects and classes.
ORM real goal: Do less work and have a happy DBA.
Hibernate is an open-source ORM toolkit for the Java
language, providing a framework for mapping an object-
oriented domain model to a traditional relational
database.

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XML (Extensible Markup Language) is a human readable
way of describing structured data.
XML is made up of tags enclosing text:
<dataset>
<record>
<name>David</name>
<age>47</age>
</record>
</dataset>
Mapping Java classes to database table is accomplished
through the configuration of an XML file.

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SQL (Structured Query Language) is a standard language
for accessing and manipulating relational databases.
SQL queries allow the user to specify a description of the
desired result set:
SELECT title, price
FROM Book
WHERE price > 100.00
ORDER BY title
SQL is designed for the retrieval and management of data in
database and database schema creation and
modification.

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• Hibernate Query Language (HQL)
• “minimal” object-oriented dialect of ANSI SQL
• Criteria Queries (QBC)
• extensible framework for query objects
• includes Query By Example (QBE)
• Native SQL queries
• SQL queries may be defined and called exactly HQL
query

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• Persistence for POJOs (JavaBeans)
• Flexible and intuitive mapping
• Support for fine-grained object models
• Powerful, high performance queries
• Dual-Layer Caching Architecture (HDLCA)
• Lazy loading