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Java persistence api
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- 2. What isJava Persistence API Primary Features Five Steps to Implement JPA ◦ Download Hibernate Components ◦ Prepare Database, and Download JDBC Driver ◦ Implemented POJO entities and add annotations ◦ Persistence.xml ◦ Implemented client side code via EntityManager
- 3. The JavaPersistence API is the standard object/relational mapping and persistence management interface of the Java EE 5.0 platform. As part of the EJB 3.0 specification effort, it is supported by all major vendors of the Java industry.
- 4. Inheritance, polymorphism, etc.Inheritance,polymorphism, etc. Using annotations and/or XMLUsing annotations and/or XML
- 5. Java Application JavaPersistence API Hibernate TopLink Kodo (OpenJPA) Everyone can use their own favorite persistence technology
- 6. Hibernate CoreHibernate Core HibernateAnnotation (JPA) Hibernate EntityManager Hibernate Annotation (JPA) Hibernate EntityManager Hibernate Annotation (Hibernate) Hibernate XML Mapping File Hibernate Annotation (Hibernate) Hibernate XML Mapping File Java Persistence APIJava Persistence API Hibernate APIHibernate API
- 7. 1. Hibernate Core 2.Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ MySQL JDBC Driver http://tinyurl.com/ymt6rb
- 8. 1. Hibernate Core 2.Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ 1. Hibernate Core 2. Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ MySQL JDBC Driver http://tinyurl.com/ymt6rb MySQL JDBC Driver http://tinyurl.com/ymt6rb
- 9. To label artifacts (classes,methods etc.) for persistence or persistence related operations To label artifacts (classes, methods etc.) for persistence or persistence related operations A “gateway” to the persistence classes A “gateway” to the persistence classes Allow access to persistent objects, transaction context, query language etc. Allow access to persistent objects, transaction context, query language etc.
- 10. Hibernate Annotationsincludes ◦ Standardized Java Persistence and EJB 3.0 (JSR 220) object/relational mapping annotations ◦ Hibernate-specific extension annotations for performance optimization and special mappings Hibernate EntityManager includes ◦ The standard Java Persistence management API ◦ The standard Java Persistence Query Language ◦ The standard Java Persistence object lifecycle rules ◦ The standard Java Persistence configuration and packaging
- 11. 1. Hibernate Core 2.Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ 1. Hibernate Core 2. Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ MySQL JDBC Driver http://tinyurl.com/ymt6rb MySQL JDBC Driver http://tinyurl.com/ymt6rb
- 14. Attached toa class Signify that a class is persistent Example: An entity must follow the Java Bean convention for its attributes to be persistent ◦ Having getters and setters
- 15. Each entitymust have an identity An identity of an entity could simply be a class variable annotated with @Id Example
- 16. Id canbe auto generated @Id(generate=GeneratorType.AUTO) There are other strategies such as ◦ GeneratorType.SEQUENCE ◦ GeneratorType.IDENTITY AUTO is best for portability between database vendors
- 17. @Column, isput on getter of a class variable Has several functionalities ◦ Updatable (boolean) ◦ Nullable (updatable) ◦ Length (int) ◦ Example:
- 18. There are4 types of links ◦ @OneToOne ◦ @OneToMany ◦ @ManyToOne ◦ @ManyToMany In most cases, putting the annotation on a getter of a class variable would be enough In some cases, we need to identify a few parameters to the annotations
- 19. Two cases ◦Two entities share the same primary key value
- 20. Entity objectshave two distinct modes ◦ Attached The object is in the database ◦ Detached The object is in memory acting as a DTO Modification on detached object would not be persisted automatically Developers need to persist detached objects using a primitive
- 21. Entity manager: ◦Gateway to persistent classes ◦ Enable queries ◦ Outside of session beans, provides transaction facility
- 22. 1. Hibernate Core 2.Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ 1. Hibernate Core 2. Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ MySQL JDBC Driver http://tinyurl.com/ymt6rb MySQL JDBC Driver http://tinyurl.com/ymt6rb
- 23. Entity classesEntity classes JDBC Driver JDBC Driver JDBC URL JDBC URL UsernameUser name passwordpassword EntityManagerFactory Name EntityManagerFactory Name
- 24. 1. Hibernate Core 2.Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ 1. Hibernate Core 2. Hibernate EntityManager 3. Hibernate Annotations http://www.hibernate.org/ MySQL JDBC Driver http://tinyurl.com/ymt6rb MySQL JDBC Driver http://tinyurl.com/ymt6rb
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