SpringBoot Data JPA 实战

Dear 丶 2022-07-15 11:47 149阅读 0赞

**搭建项目**

1）[https://start.spring.io/][https_start.spring.io] 初始化SpringBoot项目

![这里写图片描述][20161115165032448]

2）导入项目到Eclipse中

![这里写图片描述][20161115165151424]

3）添加Maven依赖：MySQL的java驱动、druid数据源

<dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>   
    
            
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.0.26</version>
            </dependency>

4）配置基本属性

spring.datasource.driverClassName=com.mysql.cj.jdbc.Driver
    spring.datasource.url=jdbc:mysql://192.168.1.12:3306/jeeboot?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
    spring.datasource.username=root
    spring.datasource.password=123456
    
    
    spring.jpa.hibernate.ddl-auto=none
    spring.jpa.show-sql=true
    spring.jackson.serialization.indent_output=true

5）定义映射实体类 User.java

@Entity
    public class User implements Serializable { 
    
        /** serialVersionUID. */
        private static final long serialVersionUID = 1L;
    
        /** 主键. */
        @Id
        @GeneratedValue
        private String id;
    
        /** 用户名. */
        private String userName = "";
    
        /** 手机号码. */
        private String mobileNo = "";
    
        /** 邮箱. */
        private String email = "";
    
        /** 密码. */
        private String password = "";
    
        /** 用户类型. */
        private Integer userType = 0;
    
        /** 注册时间. */
        private Date registerTime = new Date();
    
        /** 所在区域. */
        private String region = "";
    
        /** 是否有效 0 有效 1 无效. */
        private Integer validity = 0;
    
        /** 头像. */
        private String headPortrait = "";

6)定义数据访问接口 UserRepos.java

public interface UserRepos extends JpaRepository<User, String> {
    
        /** * 通过用户名相等查询 * * @param userName 用户名 * @return */
        List<User> findByUserName(String userName);
    
        /** * 通过名字like查询 * * @param userName 用户名 * @return */
        List<User> findByUserNameLike(String userName);
    
        /** * 通过用户名和手机号码查询 * * @param userName 用户名 * @param mobileNo 手机号码 * @return */
        User findByUserNameAndMobileNo(String userName, String mobileNo);
    
        /** * 根据用户类型，分页查询 * * @param userType 用户类型 * @param pageable * @return */
        Page<User> findByUserType(Integer userType, Pageable pageable);
    
        /** * 根据用户名，排序查询 * * @param userName 用户名 * @param sort * @return */
        List<User> findByUserName(String userName, Sort sort);
    
    }

7) 定义UserController.java

@RestController
    public class UserController { 
    
        @Autowired
        private UserRepos userRepos;
    
        @RequestMapping(value="saveUser")
        public User saveUser(){
            return userRepos.save(new User());
        }
    
        @RequestMapping(value="findByUserName")
        public List<User> findByUserName(String userName){
            return userRepos.findByUserName(userName);
        }
    
        @RequestMapping(value="findByUserNameLike")
        public List<User> findByUserNameLkie(String userName){
            return userRepos.findByUserNameLike(userName);
        }
    
        @RequestMapping(value="findByPage")
        public Page<User> findByPage(Integer userType){
            return userRepos.findByUserType(userType, new PageRequest(1, 5));
        }
    
        @RequestMapping(value="findByPageSort")
        public List<User> findByPageSort(String userName){
            return userRepos.findByUserName(userName, new Sort(Direction.DESC, "registerTime"));
        }
    
    }

![这里写图片描述][20161115180126844]

[https_start.spring.io]: https://start.spring.io/
[20161115165032448]: /images/20220715/0ed6046e2a7948869a2b6cd7d22f15e0.png
[20161115165151424]: /images/20220715/13e8411a29cb435a802237203693055a.png
[20161115180126844]: /images/20220715/e2f871a4f87e4c38969037e9e01bf4ca.png