首先建立表

Snipaste_2019-03-18_17-12-54.png

实体类（Course）

@Data
public class Course {
   private Long courseId;
   private String courseName;
   private Long userId;
   private String courseClass;
   private String cover;
   private String courseCode;
   private Short finished;
}

@CourseMapper

public interface CourseMapper {
    @Results({@Result(column = "course_id", property = "courseId"),
            @Result(column = "course_name", property = "courseName"),
            @Result(column = "user_id", property = "userId"),
            @Result(column = "course_class", property = "courseClass"),
            @Result(column = "cover", property = "cover"),
            @Result(column = "course_code", property = "courseCode"),
            @Result(column = "finished", property = "finished"),
            @Result(column = "username", property = "username"),
            @Result(column = "avatar", property = "avatar")
    })
    @Select("SELECT * FROM t_course ")
    List selectAll();
    @Results({@Result(column = "course_id", property = "courseId"),
            @Result(column = "course_name", property = "courseName"),
            @Result(column = "user_id", property = "userId"),
            @Result(column = "course_class", property = "courseClass"),
            @Result(column = "cover", property = "cover"),
            @Result(column = "course_code", property = "courseCode"),
            @Result(column = "finished", property = "finished"),
            @Result(column = "username", property = "username"),
            @Result(column = "avatar", property = "avatar")
    })
    @Select("SELECT * FROM t_course WHERE course_id= #{courseId} ")
    Course getOne(Long courseId);

    @Delete( "DELETE FROM  t_course WHERE course_id =#{courseId}" )
    void delete(Long courseId);

    @Insert("INSERT INTO t_course(course_name,user_id,course_class,cover,course_code,finished)"
    + "VALUES(#{courseName},#{userId},#{courseClass},#{cover},#{courseCode},#{finished})")
    void  insert(Course course);

    @Update("UPDATE t_course SET cover=#{cover},finished=#{finished} WHERE course_id =#{courseId}")
    void update(Course course);
}
.

CourseService

public interface CourseService {
   List seleceAll();

   Course getOne(long courseId);

   void delete(long  courseId);
   void   insert(Course course);

   void update(Course course);
}

CourseServiceImpl

@Service
public class CourseServiceImpl implements CourseService{
@Resource
private  CourseMapper courseMapper;
    @Override
    public List seleceAll() {
        return courseMapper.selectAll();
    }

    @Override
    public Course getOne(long courseId) {
        return courseMapper.getOne( courseId );
    }

    @Override
    public void delete(long courseId) {
        courseMapper.delete( courseId );
    }

    @Override
    public void insert(Course course) {
        courseMapper.insert(course);

    }

    @Override
    public void update(Course course) {
            courseMapper.update(course);
    }
}

进行测试

@RunWith(SpringRunner.class)
@SpringBootTest
public class CourseServiceTest {
    @Resource
    private CourseService courseService;

    @Test
    public void seleceAll() throws Exception {
        List  courseList = courseService.seleceAll();
        courseList.forEach( course -> System.out.println( course ) );
    }

    @Test
    public void getOne() throws Exception {
        Course course = courseService.getOne( 1L );
        System.out.println( course );

    }

    @Test
    public void delete() throws Exception {
        courseService.delete( 6L );
    }

    @Test
    public void insert() throws Exception {
         Course course = new Course();
         course.setCourseName( "微信小程序开发" );
         course.setCourseClass( "软件1721" );
         course.setUserId( 1L );
         course.setCover( "1.jpg" );
         course.setCourseCode( RandomUtil.getRandomCode() );
         course.setFinished( (short)0);
         courseService.insert( course );

    }

    @Test
    public void update() throws Exception {
        Course course = courseService.getOne(4L);
        course.setCover("999.jpg");
        course.setFinished((short) 1);
        courseService.update(course);
}}

Controller

@RestController
@RequestMapping(value = "/api")
public class CourseController {
    @Resource
    private CourseService courseService;

    @RequestMapping(value = "/courses",method = RequestMethod.GET)
    public List selectAll(){
        return courseService.seleceAll();
    }
    @RequestMapping(value = "/course/{id}",method =RequestMethod.GET)
    public Course getOne(@PathVariable("id") long id){
        return  courseService.getOne(id);

    }
    @RequestMapping(value = "/course/{id}",method = RequestMethod.DELETE)
    public  void  delete(@PathVariable("id") long id){
        courseService.delete( id );
    }

    @RequestMapping(value = "/course",method = RequestMethod.POST)
    public void addCourse(@RequestBody Course course){
        course.setCourseCode( RandomUtil.getRandomCode() );
          courseService.insert(course);
    }
    @RequestMapping(value = "/coursec",method = RequestMethod.PUT)
    public  void update(@RequestBody Course course){
        courseService.update(course);
    }


}