jpa tutorial

In recent years ORM (Object-relational Mapping, Object Relational mapping, which is the mapping of entity objects and database tables) The technology market is bustling, and a variety of persistence frameworks emerge, among which the most influential are Hibernate and Toplink. On the basis of fully absorbing the existing excellent ORM, especially the Hibernate frame design idea, Sun company has developed a new JPA (Java persistence API) specification,

JPA describes the mapping of objects-relational tables through JDK 5.0 annotations or XML, and persists entity objects for the run-time into the database.One of the goals of JPA is to develop an API that can be implemented by many vendors, and developers can code to implement the API instead of using proprietary vendor-specific APIs. So developers only need to use vendor-specific APIs to get the functionali

"http://blog.sina.com.cn/s/blog_625d79410101dbdd.html"read the top two help documents "jpa" @OneToOne one-way and "jpa" @OneToOne two-way presumably everyone is already full of curiosity and anticipation for cascading operations. Then this article will introduce you to the JPA Cascade save Operation. Before that, I would like you to look at this document and have

Learn article from: Http://www.ityouknow.com/spring-boot.htmlspring data JPA Introduction First understand what JPA is?JPA (Java Persistence API) is the Java Persistence specification proposed by Sun. It provides Java developers with an object/association mapping tool to manage relational data in Java applications. The main purpose of his presence is to simplify

Configure JPASpring JPA provides two methods to create JPA entitymanagerfactoryEntitymanagerfactory created by factorybean is applicable to environments that only use JPA for data access. Since the persistenceprovider automatic detection mechanism is used, configuration information can only be read from the default path classpath: META-INF/persistence. xml. Facto

A simple way to test JPA entities in a Java SE environmentFor software quality reasons, all the code we write is theoretically tested. JPA testing is not as convenient as a normal component, because JPA involves a database, so integration testing is essential, and a test framework like Arquillian can handle more complex integration tests, but its configuration is

Spring-data-jpaThe JPA (Java persistence API) defines a series of criteria for object persistence,At present, the implementation of this specification of products have hibernate, TopLink and so on.The spring data JPA framework, which focuses on the only business logic code that is not simplified to the spring, has been saved by the developer's only remaining implementation of the persistence layer's busines

This article describes a design approach to Java platform,enterprise Edition (Java EE 5) that leverages the Enterprise JavaBeans (EJB) 3.0 new Java Persistence API (JPA). JPA provides a standard object-relational mapping solution that avoids reliance on third-party frameworks such as Hibernate. You will see the details of the sample application, which validates the method and clarifies the key design decisi

Since JPA was first introduced in 2006, it has been widely supported by the Java development community. The next major update of the specification, the--2.0 version (JSR 317), will be completed by the end of 2009. One of the key features introduced in JPA 2.0 is the Criteria API, which gives the Java language a unique capability to develop a query that the Java compiler can verify its correctness at run tim

Transferred from: http://blog.csdn.net/linlinv3/article/details/46605719 SPRING-DATA-JPA How to use 1. What is Spring-data To simplify the code for program-to-database interaction, Spring provides a ready-made DAO layer framework that the Spring family provides spring-data for relational and NoSQL databases; For example, spring data JPA, spring data Hadoop, spring data MongoDB, spring data Solr, and s

Tags: get reason post problem extends Java RAC for SIGFirst, the summaryThe current project was originally based on Oracle development and is now being ported to PostgreSQL. Given that JPA has been used to achieve object persistence, the leader has always thought that the migration task is easy, but there are still a lot of problems in the actual process. Some of these problems are caused by nonstandard definitions of EJBS, such as mapping number (1)

Chapter One: Spring data JPA What is spring data is an open-source framework for simplifying database access and supporting cloud services. Its main goal is to make access to data easy and fast, and to support map-reduce framework and cloud computing data Services. Spring Data contains multiple sub-projects: Commons-Provides a shared infrastructure for use by individual sub-projects, supports cross-database persistence

Recently, team started to try Spring Boot + Spring data JPA as a solution to the data tier, and after a few laps on the internet, it was found that everyone was not in the JPA, for (1) MyBatis simple and intuitive enough, (2) The spring Data JPA at the bottom of hibernate is complex and performance-based.But when we came to the spring boot world, we found that sp

I. Overview　　Official website: https://projects.spring.io/spring-data-jpa/　　1. What is SPRING-DATA-JPA 　　Spring data JPA, part of the larger Spring data family, makes it easy to easily implement JPA based repositories. This module deals with enhanced support for JPA

JPA IntroductionJPA (Java Persistence API) is the Java Persistence specification proposed by Sun. It provides Java developers with an object/association mapping tool to manage relational data in Java applications. The main purpose of his presence is to simplify existing persistent development efforts and integrate ORM technology, and to end the current Hibernate,toplink,jdo and other ORM frameworks for each battalion. It is worth noting that

Persistence Entitymanagerfactory Entitymanager Find method GetReference method Persist method Remove method Merge method Case 1 The Incoming object has no ID Scenario 2 An incoming object has identitymanager in the cache without that record in the object database Scenario 3 An incoming object has a Identitymanager cache without that record in the object database Scenario 4 An Incoming object has a Identitymanager c