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Java Persistence: Core Object

v110223. Java Persistence: Core ORM. 2. Goals. Be able to map a single class and properties to the database using class annotations and ORM descriptorsBe able to get and set properties using get/set API calls instead of SQL. v110223. Java Persistence: Core ORM. 3. Objectives. Entitiesclass annotat

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Java Persistence: Core Object

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    1. v110223 Java Persistence: Core ORM 1 Java Persistence: Core Object/Relational Mapping

    2. v110223 Java Persistence: Core ORM 2 Goals Be able to map a single class and properties to the database using class annotations and ORM descriptors Be able to get and set properties using get/set API calls instead of SQL

    3. v110223 Java Persistence: Core ORM 3 Objectives Entities class annotations orm.xml descriptor Primary Key Generation Primary Keys simple composite Fine Tuning Objects Multi-table Mappings Secondary Tables Embedded Objects

    4. v110223 Java Persistence: Core ORM 4 Entities Plain Old Java Object (POJO) Classes Instantiated and used just like any other POJO Bike bike = new Bike(1); bike.setMake("trek"); bike.setModel("2200"); bike.setSize(26); Mapped to the database schema Interact with EntityManager to perform persistence operations em.persist(bike); Bike bike2 = em.find(Bike.class, 1); em.remove(bike2); Must have a no-arg constructor (spec says non-private; hibernate can work with private) be denoted as an Entity (either within class or descriptor) have at least 1 field/property labeled as Id

    5. v110223 Java Persistence: Core ORM 5 Annotated Entity Example: Bike.java

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