Springboot实现JPA

项目结构图

pom.xml文件如下

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>com.zhenqi</groupId>    <artifactId>springboot_jpa</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>jar</packaging>    <name>springboot_jpa</name>    <description>Demo project for Spring Boot</description>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.4.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>        <java.version>1.7</java.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <!-- 持久层 -->        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-data-jpa</artifactId>        </dependency>        <!-- h2内存数据库 -->        <dependency>            <groupId>com.h2database</groupId>            <artifactId>h2</artifactId>            <scope>runtime</scope>        </dependency>        <dependency>            <groupId>javax</groupId>            <artifactId>javaee-api</artifactId>            <version>7.0</version>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

实体类User.java

package com.zhenqi.study.entity;import javax.persistence.Entity;import javax.persistence.GeneratedValue;import javax.persistence.Id;/** * Created by wuming on 2017/7/18. */@Entitypublic class User {    @Id    @GeneratedValue    private Long id;    private String name;    private Integer age;    public User() {    }    public User(String name, Integer age) {        this.name = name;        this.age = age;    }}

定义DAO接口，UserRepository.java

package com.zhenqi.study.repository;import com.zhenqi.study.entity.User;import org.springframework.data.jpa.repository.JpaRepository;import java.util.List;/** * Created by wuming on 2017/7/19. */public interface UserRepository extends JpaRepository<User, Long> {    List<User> findByNameLike(String name);}

测试类

package com.zhenqi.study;import com.zhenqi.study.entity.User;import com.zhenqi.study.repository.UserRepository;import static org.assertj.core.api.Assertions.assertThat;import org.junit.After;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)@SpringBootTestpublic class SpringbootJpaApplicationTests {    @Autowired    UserRepository userRepository;    @Test    public void proxy() throws Exception {        System.out.println(userRepository.getClass());    }    @Test    public void save() throws Exception {        for (int i = 0; i < 10; i++) {            User user = new User("zhenqi" + i, 25 + i);            userRepository.save(user);        }    }    @Test    public void all() throws Exception {        save();        assertThat(userRepository.findAll()).hasSize(10);    }    @Test    public void findByName() throws Exception {        save();        assertThat(userRepository.findByNameLike("zhen%")).hasSize(10);    }    @After    public void destroy() throws Exception {        userRepository.deleteAll();    }}

最后附上配置文件 application.properties

spring.jpa.generate-ddl=truespring.jpa.show-sql=truespring.jpa.hibernate.ddl-auto=createspring.jpa.properties.hibernate.format_sql=false