jpa java

. package Org. Springboot. Sample. DAO;Import Java. Util. List;Import Javax. Transaction. Transactional;import org. Springboot. Sample. Entity. Score;import org. Springframework. Data. JPA. Repository. modifying;import org. Springframework. Data. JPA. Repository. Query;import org. Springframework. Data. Repository. Crudrepository;import org. Springframework. Data

1. Create a JPA project First, create a JPA project (if you do not know that JPA creates or appears in least one user library must be selected, refer to Http://blog.csdn.net/baidu_37107022/article /details/76554393) Jar Package Description 2. Create entity Classes description of related annotations in entity classes * @Table annotation class corresponding tab

Java Persistence APISince EJB technology can begin to be applied, there is always doubt about its usability in practical applications. In my opinion, the two most important causes of this phenomenon are complexity and resource-intensive nature. As a result, frameworks (such as Spring and Hibernate) that are simpler than EJBS and have smaller resource spaces are then popular. To illustrate this point, we note that the direction of the EJB 3.0 specifica

:jpaspecificationexecutor: The interface used to do the query 6:specification: A query specification provided by Spring Data JPA, to make complex queries, simply set the query criteria around this specification toHelloWorldn Environment constructs a common Java project in eclipse, mainly to add a bunch of jar packages. 1: First download Spring data Common and spring data

Employee. Java: (base class) 1 @ Entity 2 @ Inheritance (Strategy = inheritancetype. single_table) // Select an inheritance Policy 3 @ Discriminatorcolumn (name = "type ") // Configure the authenticator 4 @ Discriminatorvalue ("0 ") // Set the authenticator Value 5 Public Class Employee { 6 @ ID 7 @ Generatedvalue 8 Private Integer ID; 9 Private String name; 10 Public Integer GETID (){ 11 Return ID;12 } 13

1. What is Jpa?JPA full name Java persistence API. 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. JPA (Java Persistence A

The WTP project under Eclipse Engineering includes a new development view--JPA (Java persistence API). The JPA (Java persistence API) is the new data persistence programming model introduced in EJB 3.0. JPA leverages annotations (Annotation) and object/relational mappings t

JPA Java persistence API is a standard ORM interface of Java ee 5 and part of ejb3 specifications. Hibernate, a popular ORM framework today, is an implementation of JPA, but its function is the superset of JPA. The relationship between J