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.
 */
@Entity
public 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)
@SpringBootTest
public 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=true
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=create
spring.jpa.properties.hibernate.format_sql=false