Presentation JPA

Java Persistence API JS Bournival 5 juin 2006

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Un peu d’histoire … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Un peu d’histoire … ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Les besoins ,[object Object],[object Object],[object Object]

EJB 3.0 vs. Java Persistence API ,[object Object],[object Object],[object Object],[object Object]

Java Persistence API: Quoi de neuf? ,[object Object],[object Object],[object Object],[object Object],[object Object],* POJO – n.m. [pôdjô] POJO is an acronym for Plain Old Java Object , and is favoured by advocates of the idea that the simpler the design, the better. - Wikipedia. "We wondered why people were so against using regular objects in their systems and concluded that it was because simple objects lacked a fancy name. So we gave them one, and it's caught on very nicely." - Martin Fowler

Java Persistence API: Mappings de base ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],@Table(name= " EMP " ) @Entity @Id @Column(name= "EMP_NAME " ) EMP_NAME NAME @Lob « BLOB » PIC SALARY ID EMP

Relations ,[object Object],[object Object],[object Object],[object Object],[object Object]

Relationship: Many to One ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],@Table(name= " EMP " ) @Entity @Id public class Department { private int id; private String dname; // getters & setters ... } @Entity @Id @ManyToOne FK PK DEPT_ID ID EMP PK DNAME ID DEPARTMENT @JoinColumn(name= " DEPT_ID " )

Relationship: One to Many ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],@Table(name= " EMP " ) @Entity @Id public class Department { private int id; private String dname; private Collection<Employee> emps; // getters & setters ... } @Entity @Id @ManyToOne FK PK DEPT_ID ID EMP PK DNAME ID DEPARTMENT @JoinColumn(name= " DEPT_ID " ) @OneToMany(mappedBy= "d")

Relationships: One to One ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],@Table(name= " EMP " ) @Entity @Id public class ParkingSpace { private int id; private int lot; private String location; private Employee emp; // getters & setters ... } @Entity @Id @OneToOne FK PK P_SPACE ID EMP PK LOCATION LOT ID @JoinColumn(name= " P_SPACE " ) PARKINGSPACE @OneToOne(mappedBy= "space" )

Relationships: Many to Many ,[object Object],[object Object],[object Object],[object Object],@Table(name= " EMP " ) @Entity @Id public class Project { private int id; private String name; private Collection< Employee> e; // getters & setters ... } @Entity @Id @ManyToMany PK SALARY NAME ID EMP PK NAME ID PROJECT @ManyToMany(mappedBy= "p" ) PK,FK1 PROJ_ID EMP_ID EMP_PROJ PK,FK2 @JoinTable(name= " EMP_PROJ " , joinColumns= @JoinColumn(name= " EMP_ID " ), inverseJoinColumns= @JoinColumn(name= " PROJ_ID " ))

Héritage ,[object Object],[object Object],[object Object],[object Object]

Héritage: single table ,[object Object],EMP_TYPE NAME START_DATE DAILY_RATE TERM VACATION ID PK EMP

Héritage: joined table ,[object Object],NAME START_DATE EMP_TYPE ID PK EMP DAILY_RATE TERM ID PK,FK ContractEmployee VACATION ID PK,FK NurunEmployee

Héritage: table per concrete class ,[object Object],NAME S_DATE DAILY_RATE TERM ID PK,FK ContractEmployee NAME S_DATE VACATION ID PK,FK NurunEmployee

Entity Manager: le cœur de la JPA ,[object Object],[object Object],[object Object],[object Object]

Entity Manager: petit exemple ,[object Object],public class EmployeeServlet extends HttpServlet { EntityManagerFactory emf; public Employee find(int id) { EntityManager em = emf.createEntityManager(); return em.find(Employee.class, id); } } public class EmployeeServlet extends HttpServlet { EntityManagerFactory emf; public void createEmployee() { EntityManager em = emf.createEntityManager(); Employee emp = new Employee(); // apply setters // ... em.persist(emp); } } @PersistenceUnit(unitName= " emp " ) Dependency Injection!

EntityManager: déclarer le persistence unit ,[object Object],<?xml version="1.0"?> <persistence> <persistence-unit name= " emp "> <jta-data-source>jdbc/EmployeeDS</jta-data-source> <!–- autres propriétés du persistence provider --> </persistence-unit> </persistence> persistence.xml

Queries: NamedQueries ,[object Object],[object Object],[object Object],@Entity @NamedQuery(name= " myQuery " , query= "Select o from MyPojo o" ) public class MyPojo { … } public class MyService { public void myMethod () { … List results = em.createNamedQuery( " myQuery " ).getResultList(); … } }

Queries: NativeQueries ,[object Object],public class MyService { public void myMethod () { … List results = em.createNativeQuery( “ SELECT * FROM MyPojo “, MyPojo.class ) .getResultList(); … } }

Transactions ,[object Object],[object Object],[object Object],[object Object],[object Object]

Transactions: JTA ,[object Object],public class MyServlet extends HttpServlet { … @Resource UserTransaction utx; public void doGet (…) { utx.begin() // persistence operations … utx.commit(); } }

Transactions: Resource-local ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Petite demo sympathique ,[object Object],[object Object],[object Object],[object Object]

[object Object],Support de l’industrie

Application server / persistence engine ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Outils ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

References http://www.jcp.org/en/jsr/detail?id=220 http://www.eclipse.org/dali/ https://glassfish.dev.java.net/ http://hibernate.org/299.html http://solarmetric.com/Software/Kodo/kodoejb.php http://www.oracle.com/technology/products/ias/toplink/JPA/index.html http://dev2dev.bea.com/persistence/ http://www.jroller.com/page/mkeith http://blog.hibernate.org/ http://blogs.sun.com/theaquarium http://apress.com/book/bookDisplay.html?bID=10093 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],[object Object]

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