Spring Data JPA

Commons - 提供共享的基础框架，适合各个子项目使用，支持跨数据库持久化。
JPA - 简化创建 JPA 数据访问层和跨存储的持久层功能。

Spring Data JPA提供的接口
1：Repository：最顶层的接口，是一个空的接口，目的是为了统一所有Repository的类型，且能让组件扫描的时候自动识别。
2：CrudRepository ：是Repository的子接口，提供CRUD的功能。
3：PagingAndSortingRepository：是CrudRepository的子接口，添加分页和排序的功能。
4：JpaRepository：是PagingAndSortingRepository的子接口，增加了一些实用的功能，比如：批量操作等。
5：JpaSpecificationExecutor：用来做负责查询的接口。
6：Specification：是Spring Data JPA提供的一个查询规范，要做复杂的查询，只需围绕这个规范来设置查询条件即可。

实例-配置
pom.xml

<dependency>            <groupId>org.hibernate</groupId>            <artifactId>hibernate-entitymanager</artifactId>            <version>4.2.1.Final</version>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>5.1.25</version>        </dependency>        <!--spring -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-core</artifactId>            <version>4.1.9.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-beans</artifactId>            <version>4.1.9.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>            <version>4.1.9.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jdbc</artifactId>            <version>4.1.9.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-tx</artifactId>            <version>4.1.9.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-web</artifactId>            <version>4.1.9.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>            <version>4.1.9.RELEASE</version>        </dependency>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-test</artifactId>            <version>4.1.9.RELEASE</version>        </dependency>        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>4.11</version>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.springframework.data</groupId>            <artifactId>spring-data-jpa</artifactId>            <version>1.5.1.RELEASE</version>        </dependency>    </dependencies>

web.xml

 <!-- Spring MVC核心控制器-->    <servlet>        <servlet-name>springmvc</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <init-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath*:spring-mvc.xml</param-value>    </init-param>        <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>        <servlet-name>springmvc</servlet-name>        <url-pattern>/</url-pattern>  </servlet-mapping>  <!-- Spring监听器-->    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <!-- 框架配置文件位置 -->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath*:applicationContext-*.xml</param-value>    </context-param>

applicationContext-persistence.xml

<tx:annotation-driven /><context:component-scan base-package="com.dao" /><context:component-scan base-package="com.impl" /><bean id="jpa" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">        <property name="dataSource" ref="dataSource" />        <property name="packagesToScan" value="com.dto" />        <property name="jpaVendorAdapter">            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />        </property>        <property name="jpaProperties">            <props>                <prop key="hibernate.hbm2ddl.auto">update</prop>                                <prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>                <prop key="hibernate.ddl-auto">update</prop>            </props>        </property></bean><bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">        <property name="driverClassName" value="com.mysql.jdbc.Driver" />        <property name="url" value="jdbc:mysql://localhost:3306/test" />        <property name="username" value="root" />        <property name="password" value="mysql" />    </bean><bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">        <property name="entityManagerFactory" ref="jpa" /></bean><bean id="persistenceExceptionTranslationPostProcessor"class="org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor" /><jpa:repositories base-package="com.dao"entity-manager-factory-ref="jpa"transaction-manager-ref="transactionManager" />

Dao.java

    public News readById(int id);    @Query("select n from News n where n.title=?1")//HSQL    public Iterable<News> searchByTitle(String title);    @Query("select n from News n where n.content= :content")//HSQL    public Iterable<News> searchByContent(@Param("content")String content);    @Modifying    @Query("update News n set n.title= :title where n.id= :id")//HSQL    public int setTitle(@Param("id")int id,@Param("title")String title);    @Modifying    @Query("delete  News n where n.content=?1")//HSQL     public void deleteByContent(String content);

Test.java

@org.junit.Testpublic void save(){        News news = new News();        news.setTitle("This is a test news");        news.setContent("This is a test content.");        news.setCreateDate(new Date());        newsService.save(news);     }@org.junit.Testpublic void testlistAll(){        Iterable<News> newsList = newsService.listAll();        Iterator<News> newsIterator = newsList.iterator();        while(newsIterator.hasNext()){            News temp = newsIterator.next();            System.out.println(temp);        }}@org.junit.Testpublic void testreadById(){        News newsIterable = newsService.readById(1);System.out.println(newsIterable.toString());}@org.junit.Testpublic void testdeleteById(){        newsService.deleteById(1);}@org.junit.Testpublic void testdeleteByContent(){        newsService.deleteByContent("This is");}@org.junit.Testpublic void testsetTitle(){    System.out.println(newsService.setTitle(1,"first"));}@org.junit.Testpublic void testHsql(){        Iterable<News> newsIterable = newsService.searchByTitle("This is a test news");        StringBuffer result = new StringBuffer();        Iterator<News> newsList = newsIterable.iterator();        while(newsList.hasNext()){            result.append(newsList.next().toString()+"\n");        }        System.out.println(result.toString());    }@org.junit.Testpublic void test2Hsql(){        Iterable<News> newsIterable = newsService.searchByContent("This is");        StringBuffer result = new StringBuffer();        Iterator<News> newsList = newsIterable.iterator();        while(newsList.hasNext()){            result.append(newsList.next().toString()+"\n");        }        System.out.println(result.toString());}@org.junit.Testpublic void testPage(){        Iterable<News> newsIterable = newsService.queryByPage(1);        StringBuffer result = new StringBuffer();        Iterator<News> newsList = newsIterable.iterator();        while(newsList.hasNext()){            result.append(newsList.next().toString()+"\n");        }        System.out.println(result.toString());}

实例-代码：
http://download.csdn.net/download/qq_30364013/9755735