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Hibernate_ORM_JPA Hibernate_ORM_JPA.pptx
- 1. ORM,JPA,HIBERNATE 1.What is ORM? 2.What is Hibernate and its architecture. 3. What is JPA and how does it work? Author: Pham Anh Quan
- 2. 1. WHAT ISORM? ORM is a programming technique that helps to transfer data from object to database and vice versa.
- 3. 2. What isHibernate and its architecture. What is Hibernate? In the business layer, there are two sublayers, the logic layer and the persistence layer. Hibernate is one of the ORM Frameworks. Hibernate framework is a framework for persistence layer.
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- 5. These are thePOJO objects that will map to the corresponding tables of the relational database. Persistence object
- 6. Configuration The Configuration objectprovides two main components: Database Connection: To connect to the database, Configuration uses one or more configuration files in the form of hibernate.properties Class Mapping Setup: This component creates connections between Java classes and database tables.
- 7. Session Factory Sessionfactory inHibernate is an interface that connects to the Database through reading Configuration. Each database requires its own Session Factory.
- 8. Transaction A Transaction representsa unit of action to the database
- 9. Transaction A Transaction representsa unit of action to the database
- 10. 1. WHAT ISJPA? JPA acts as a mapping between JAVA objects and a relational database using ORM . technology JPA acts as a bridge between tables / relationships between tables in the database and classes / relationships between objects. For example, the USER table with columns (Id, username, password) will correspond to the User.java class with the fields Id, username, and password. Since then, every time we query tables or columns, we will directly call methods on classes and fields of the class without caring about what type of database we are using, what kind of database data we are using, etc.
- 11. JPA architecture JPA consistsof three main components: Entity, EntityManager, and EntityManagerFactory. There are also, EntityTransaction, Persistence, Query.
- 12. Enity Entities are objectsthat represent a table in the database. Entities are usually simple POJO classes, consisting only of getter and setter methods.
- 13. Entity Manager EntityManager isan interface that provides APIs for interacting with Entities. Some basic functions of EntityManager such as: Persist: this method is used to save a newly created entity to the database. Merge: used to update the state of the entity into the database. Remove: delete an instance of the entity.
- 14. EntityManagerFactory EntityManagerFactory is usedto create an instance of EntityManager. Persistence A Persistence defines a set of Entity classes that are managed by an instance of EntityManager in the application.
- 15. EntityTransaction A Transaction isa set of operations where all operations must either be successful or all fail. A database transaction consists of a set of SQL statements committed or rolled back in a unit. Query This is an interface, implemented by each JPA provider to get relational objects that meet the query criteria.
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