Detailed Introduction springdata__spring

1. What is Springdata.

The Spring Data project is designed to simplify the building of data access counts based on the spring framework application, including non relational databases, Map-reduce frameworks, cloud data services, and so on, and also includes access support for relational databases.

Spring Data contains multiple subprojects:

Commons-Provides a shared infrastructure for use by subprojects to support cross-database persistence

Hadoop-a MapReduce job based on Spring's Hadoop job configuration and a POJO programming model

Key-value-integrates Redis and Riak to provide simple encapsulation in a number of common scenarios

Document-Integrated documentation database: CouchDB and MongoDB and provides basic configuration mapping and database support

Graph-Integrated NEO4J provides a powerful, POJO-based programming model

Graph Roo Addon-roo support for neo4j

JDBC Extensions-Supports Oracle RAD, advanced queues, and advanced data types

JPA-simplifies the creation of JPA data access tiers and persistence layer functionality across storage

Mapping-Provides an object mapping framework based on Grails to support different databases

Examples-sample programs, documents, and diagram databases

Guidance-Advanced Documentation
After seeing so many professional introductions, the spring Data project is designed to provide a common coding model that unifies our APIs.

2.HelloWorld DisplayLearning anything, from a simple and understandable demo to learn, will be very important, the following first to see a simple helloworlddemo directly to the DAO layer.[Java]  View plain  copy  print? <span style= "font-family:comic sans ms;font-size:18px;" >/**        *  @FileName: personrepotory.java       *  @Package:com.tgb.springdata.entity      *  @Description:  todo     *  @author: lucky       *  @date : November 8, 2015   PM 6:38:58      *  @version  V1.0         */   package com.tgb.springdata.entity;      import  java.util.date;   import java.util.list;      import  org.hibernate.type.truefalsetype;   import org.springframework.data.jpa.repository.jparepository ;   import org.springframework.data.jpa.repository.jpaspecificationexecutor;   Import  org.springframework.data.jpa.repository.modifying;   import org.springframework.data.jpa.repository.query;   import org.springframework.data.jpa.repository.support.jparepositoryfactory;   import  org.springframework.data.repository.crudrepository;   import  org.springframework.data.repository.pagingandsortingrepository;   import  org.springframework.data.repository.repository;   import  org.springframework.data.repository.query.param;     /**     * @ classname: personrepotory      *  @Description: todo     *  @author: lucky     *  @date: November 8, 2015   afternoon 6:38:58         */     /*   * 1.repository is an empty interface, which is a markup interface    * 2. If our defined interface inherits repository, the interface is identified by the IOC container as a repository bean   *  injected into the IOC container, intoIn this interface, you can define interfaces    * 3 that meet certain rules. You can actually replace the repository interface    */with an annotation @repositorydefination  annotation   /*   *  declaring methods in repository sub-interfaces    * 1. It's not a statement, it needs to conform to certain specifications