Posted in: Hibernate,Hibernate Query examples (HQL)
Overview of Hibernate :- Open Source light-weight ORM solution
- Doesn’t require container (light-weight)
- Object based model
- Transparent solutions
- It is around from quite some time
- Very well matured and adopted by a large developer community
- Saving objects for future use
- Storage could be a File system, RDBMS etc
- Today’s popular data storage systems are RDBMS
- Objects are not directly mapped to RDBMS tables
ORM - Object Relational Mapping – New solution :
- Persists Objects in a Relational Database
- Transparent solution; underlying tables are hidden from classes
- Support CRUD (Create, Read, Update and Delete) operations
- Provides RDBMS Vendor independence
- Hibernate is built on top of JDBC
- Hibernate was introduced to address the issues of Entity Beans
- Hibernate is built on top of JNDI, JDBC, JTA It uses XML based configuration files for mapping
- Supports many databases like Sybase, Oracle, MySQL, other Object Oriented Databases etc.
- Easy migration from one vendor database to another
- Hibernate generates the JDBC Code based on the underlying vendor database
- Hibernate APIs are very simple to learn and use
- Provides quite powerful object query language known as Hibernate Query Language (HQL)