springboot集成spring-data-jpa

springboot集成spring-data-jpa

第一步：添加Spring Data JPA的起步依赖

    org.springframework.boot
    spring-boot-starter-data-jpa

  此处是扩展部分（扩展部分纯属扯淡可以不看） 
            Spring Data JPA 官方地址；(https://spring.io/projects/spring-data-jpa)
            里面有很详细的资料，可惜是英文的。

第二步：添加数据库驱动依赖

    mysql
    mysql-connector-java

第三步：在application.properties(或者application.yum)中配置数据库和jpa的相关属性

#DB Configuration:
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/ceshi?useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root

#JPA Configuration:
spring.jpa.database=MySQL
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy

第四部：创建实体

@Entity
public class User{

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String username;
    private String password;
    private String name;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + ''' +
                ", password='" + password + ''' +
                ", name='" + name + ''' +
                '}';
    }
}

第五步：编写UserRepository

public interface UserRepository extends JpaRepository{
    public List findAll();
}

第六步：编写测试类

@RunWith(SpringRunner.class)
@SpringBootTest(classes=MySpringBootApplication.class)
public class JpaTest {

    @Autowired
    private UserRepository userRepository;

    @Test
    public void test(){
        List users = userRepository.findAll();
        System.out.println(users);
    }

}

第七部：打印测试一下
忘记写数据库的事情了粘贴一些

CREATE TABLE `user` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT COMMENT '用户编号',
  `name` varchar(20) DEFAULT NULL COMMENT '用户名拼音',
  `password` char(32) DEFAULT NULL COMMENT '密码',
  `username` varchar(20) DEFAULT NULL COMMENT '用户名',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=3 DEFAULT CHARSET=utf8