Hibernate introduction
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- 2. 2 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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- 4. 4 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.
- 5. 5 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.
- 6. 6 • 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
- 7. 7 • 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