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What is JPA? JPA (Java persistence API)Is a Java persistence specification officially proposed by Sun.It provides Java developers with an object/association ing tool to manage the relational data in Java applications. His appear

1.JPA Solid life cycle:JPA entities have the following 4 Life cycle states:(1). New: Instantaneous object, no ID yet, and object associated with persistence context.(2). Managed: Persisted managed object, with ID value, has already established an associated object with persistence context.(3). Datached: A free-form offline object with an ID value, but no associated object with persistence context.(4). Removed: Deleted objects, with ID values, are asso

What is 1.JPA? and related overview JPA is a shorthand for the Java persistence API, an ORM specification that Sun is officially proposing! Sun has proposed this specification for 2 reasons:1. Simplify existing Java EE and Java SE application development work.2.

This article describes the latest UML-TO-JPA transformations in Rational Software Architect (RSA) V7.5, which allows users to design JPA configuration and data models on the UML object model, and to quickly generate Java classes with JPA annotations that can Developers are freed from frequent repetitive work. When the

Spring entry --- JPA learning notes, --- jpa learning notes Spring, which has been used for a period of time, is now only in a usable state and does not know much about anything deeper. So I decided to start learning Spring in depth. This document mainly records JPA learning. Before learning JPA, you need to understand

http://blog.csdn.net/hmk2011/article/details/6289151 (1), JPA Introduction:JPA is all called the Java Persistence API, and the Java Persistence API is the Java Persistence interface proposed by Sun Company in the Java EE 5 specification.

(1), JPA Introduction:JPA is all called the Java Persistence API, and the Java Persistence API is the Java Persistence interface proposed by Sun Company in the Java EE 5 specification. JPA draws on the strengths of today's

Defined Java Persistence API JPA uses JDK 5.0 annotations or XML to describe the mapping relationships of object-relational tables and to persist the entity objects of the runtime to the database. Origins Sun introduced the new JPA ORM specification for two reasons: first, simplifying the development of object persistence for existing

JPA development entry instance and jpa entry instance 1. What is JPA? JPA is a Java persistence specification officially proposed by sun. It provides Java developers with an object/relationship ing tool to manage the relational da

Label: use Java SP strong data on code Work Management I. Details about JPA JPA (Java persistence API) is a Java persistence specification officially proposed by Sun. It provides an object/link ing tool for Java developers to m

JPA (3): JPA + Hibernate basic learning In the first article of this series, we have mentioned JPA and Hibernate. Is the role of the two in the system architecture: We can draw two conclusions from a piece of film: first, the main role of JPA is persistence operations; secondly, J