Springboot整合Mybatis进行CRUD
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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);
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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;
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
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