1.进行多功能模块的建立项目

• 建立一个spring-boot-mybatis

  
  
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• entity的course类

package com.springboot.mybatis.entity;

import lombok.Data;

@Data
public class Course {
    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;
    }

    private Long courseId;
    private String courseName;
    private Long userId;
    private String courseClass;
    private String cover;
    private String courseCode;
    private Short finished;
}

• CourseMapper类

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);
}

• CourseService类

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);
}

• RandomUtil类

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();
    }
}

• SpringBootMybatisApplication类

package com.springboot.mybatis;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("com.springboot.mybatis.mapper")
public class SpringBootMybatisApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootMybatisApplication.class, args);
    }

}

• CourseServiceImplTest类

package com.springboot.mybatis;

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(7L);
    }

    @Test
    public void insert() {
        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() {
        Course course = courseService.getOne(2L);
        course.setCover("999.jpg");
        course.setFinished((short) 1);
        courseService.update(course);
    }
}

• CourseController类

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

    /**
     * 新增班课
     *
     * @param course
     */
    @RequestMapping(value = "/course", 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);
    }
}

• 在postman的运行结果

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