1.Spring-boot-Mybatis模块结构

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2.内部各类代码（增删改查功能的实现）

1.Controller
UserController.java

package com.springboot.mybatis.controller;

import com.springboot.mybatis.entity.Course;
import com.springboot.mybatis.service.CourseService;
import com.springboot.mybatis.util.RandomUtil;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;
import java.util.List;

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

/**
 * 查询所有班课
 *
 * @return
 */
@RequestMapping(value = "/courses", method = RequestMethod.GET)
public List<Course> selectAll() {
    return courseService.selectAll();
}

/**
 * 根据id查询班课
 *
 * @param id
 * @return
 */
@RequestMapping(value = "/courses/{id}", method = RequestMethod.GET)
public Course getOne(@PathVariable("id") long id) {
    return courseService.getOne(id);
}

/**
 * 根据id删除班课
 *
 * @param id
 */
@RequestMapping(value = "/courses/{id}", method = RequestMethod.DELETE)
public void deleteCourse(@PathVariable("id") long id) {
    courseService.delete(id);
}

/**
 * 新增班课
 *
 * @param course
 */
@RequestMapping(value = "/courses", method = RequestMethod.POST)
public void addCourse(@RequestBody Course course) {
    course.setCourseCode(RandomUtil.getRandomCode());
    courseService.insert(course);
}

/**
 * 更新班课
 *
 * @param course
 */
@RequestMapping(value = "/course", method = RequestMethod.PUT)
public void updateCourse(@RequestBody Course course) {
    courseService.update(course);
}}

2.entity
Course.java

package com.springboot.mybatis.entity;

import lombok.Data;

@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;

public Long getCourseId() {
    return courseId;
}

public void setCourseId(Long courseId) {
    this.courseId = courseId;
}

public String getCourseName() {
    return courseName;
}

public void setCourseName(String courseName) {
    this.courseName = courseName;
}

public Long getUserId() {
    return userId;
}

public void setUserId(Long userId) {
    this.userId = userId;
}

public String getCourseClass() {
    return courseClass;
}

public void setCourseClass(String courseClass) {
    this.courseClass = courseClass;
}

public String getCover() {
    return cover;
}

public void setCover(String cover) {
    this.cover = cover;
}

public String getCourseCode() {
    return courseCode;
}

public void setCourseCode(String courseCode) {
    this.courseCode = courseCode;
}

public Short getFinished() {
    return finished;
}

public void setFinished(Short finished) {
    this.finished = finished;
}

}

3.Mapper
CourseMapper.java

package com.springboot.mybatis.mapper;

import com.springboot.mybatis.entity.Course;
import org.apache.ibatis.annotations.*;

import java.util.List;

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

@Results({
        @Result(property = "courseId", column = "course_id"),
        @Result(property = "courseName", column = "course_name"),
        @Result(property = "userId", column = "user_id"),
        @Result(property = "courseClass", column = "course_class"),
        @Result(property = "cover", column = "cover"),
        @Result(property = "courseCode", column = "course_code"),
        @Result(property = "finished", column = "finished")
})
@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);

}

• 注： image.png
  此处SQL语句中 image.png 只是为了转行所进行的操作，如不需转行，将 “ + ” 去掉并添加空格即可。

4.service
CourseService.java

package com.springboot.mybatis.service;

import com.springboot.mybatis.entity.Course;

import java.util.List;

public interface CourseService {
List<Course> selectAll();

Course getOne(long courseId);

void delete(long courseId);

void insert(Course course);

void update(Course course);

}

5.service.Impl
CourseServiceImpl.java

package com.springboot.mybatis.service.Impl;

import com.springboot.mybatis.entity.Course;
import com.springboot.mybatis.mapper.CourseMapper;
import com.springboot.mybatis.service.CourseService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

@Service
public class CourseServiceImpl implements CourseService {
@Resource
private CourseMapper courseMapper;

@Override
public List<Course> selectAll() {
    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);
}

}

6.util工具类
随机数工具类RandomUtil

package com.springboot.mybatis.util;

import java.util.Random;

/**随机数工具类 */
public class RandomUtil {
public static String getRandomCode() {
StringBuffer stringBuffer = new StringBuffer();
Random random = new Random();
for (int i = 0; i < 6; i++) {
//生成[0,bound)的随机整数
int num = random.nextInt(10);
//将随机数加入可变长字符串
stringBuffer.append(num);
}
return stringBuffer.toString();
}
}

7.junit测试类
CourseServiceImplTest

package com.springboot.mybatis.service.Impl;

import com.springboot.mybatis.entity.Course;
import com.springboot.mybatis.service.CourseService;
import com.springboot.mybatis.util.RandomUtil;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;

import java.util.List;

import static org.junit.Assert.*;

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

@Test
public void selectAll() {
    List<Course> courseList = courseService.selectAll();
    courseList.forEach(course -> System.out.println(course));
}

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

@Test
public void delete() {
    courseService.delete(1L);
}

@Test
public void insert() {
    Course course = new Course();
    course.setCourseName("微信小程序开发22");
    course.setCourseClass("软件1721");
    course.setUserId(6L);
    course.setCover("1.jpg");
    course.setCourseCode(RandomUtil.getRandomCode());
    course.setFinished((short) 0);
    courseService.insert(course);
}

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

}

3.数据库中数据表的配置

image.png