Java persistence api tutorial pdf

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java persistence api tutorial pdf

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What is JPA? - JPA Implimentation

JPA Tutorial

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JPA Tutorial

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As a specification, the Java Persistence API is concerned with persistence , which loosely means any mechanism by which Java objects outlive the application process that created them. Not all Java objects need to be persisted, but most applications persist key business objects. The JPA specification lets you define which objects should be persisted, and how those objects should be persisted in your Java applications. By itself, JPA is not a tool or framework; rather, it defines a set of concepts that can be implemented by any tool or framework. Because of their intertwined history, Hibernate and JPA are frequently conflated. However, like the Java Servlet specification, JPA has spawned many compatible tools and frameworks; Hibernate is just one of them. King developed Hibernate as an alternative to entity beans for persistence.

Even though proprietary mapping products like Hibernate and TopLink still exist, they are now focused on providing their functionality through the JPA API, allowing all applications to be portable across JPA implementations. It covers entities, identifiers, O-R mappings, using an entity manager, creating and executing queries, and configuration of the persistence. The basic unit of persistence in JPA is the entity , which is nothing more than a regular Java class with metadata to describe how its state maps to the database tables. Metadata may be in the form of annotations on the entity class itself, or it may be an accompanying XML file, but we are using annotations since they are easier to specify and understand. Every entity class should have an Entity marker and an identifier field, indicated by Id , that is mapped to the primary key column in the database.

However, the data is rarely written directly from the user input to the database. Applications that follow a multilayered architecture have an intermediate business logic or domain layer , which is implemented as Java classes. The data binding model in Vaadin can be used to bind user interface components to a domain layer. The purpose of Java Persistence API is to define how the Java classes of the domain layer are mapped to database tables. Using the mappings, the instances of such classes can be persisted — stored in and retrieved from the database — without writing complex queries and copying the values between the queries and the domain model. Vaadin JPAContainer allows connecting Vaadin user interface components directly to the persistent model objects. It is an implementation of the container interface defined in the Vaadin core framework.

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