12.1

package com.example.service;

import com.example.mapper.UserMapper;
import com.example.pojo.Student;
import com.example.pojo.Teacher;
import com.example.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;

    public int getByUser(String username, String password, String position) {
        return userMapper.getByUser(username, password, position);
    }

    public void add(User user) {
        String userName = user.getUserName();
        String password = user.getPassword();
        String position = user.getPosition();
        userMapper.add(userName, password, position);
    }

    public void addTea(Teacher teacher) {
        String teacherID = teacher.getTeacherID();
        String teacherName=teacher.getTeacherName();
        String teacherSex=teacher.getTeacherSex();
        String teacherCollege = teacher.getTeacherCollege();
        String position=teacher.getPosition();
        userMapper.addTea(teacherID, teacherName, teacherSex,teacherCollege, position);
    }

    public void addStu(Student student) {
        String studentID = student.getStudentID();
        String studentName = student.getStudentName();
        String studentSex = student.getStudentSex();
        String studentClass = student.getStudentClass();
        String studentMajor = student.getStudentMajor();
        userMapper.addStu(studentID, studentName, studentSex, studentClass, studentMajor);
    }
}

TeacherService

package com.example.service;

import com.example.mapper.TeacherMapper;
import com.example.pojo.Course;
import com.example.pojo.Information;
import com.example.pojo.Teacher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class TeacherService {
    @Autowired
    private TeacherMapper teacherMapper;

    public Teacher getName(String username) {
        return teacherMapper.getName(username);
    }

    public void addCourse(Course course) {
        String courseID = course.getCourseID();
        String courseName = course.getCourseName();
        int courseCount = course.getCourseCount();
        String courseTeacher = course.getCourseTeacher();
        int count = course.getCount();
        teacherMapper.addCourse(courseID, courseName, courseCount, courseTeacher, count);
    }

    public void updateTea(Teacher teacher) {
        String teacherID = teacher.getTeacherID();
        String teacherName = teacher.getTeacherName();
        String teacherSex = teacher.getTeacherSex();
        String teacherCollege = teacher.getTeacherCollege();
        String position = teacher.getPosition();
        teacherMapper.updateTea(teacherID, teacherName, teacherSex, teacherCollege, position);
    }

    public Teacher getByName(String name) {

        return teacherMapper.getByName(name);
    }

    public Teacher getAll(String username) {
        return teacherMapper.getAll(username);
    }

    public List<Course> getCourse(String name) {
        return teacherMapper.getCourse(name);
    }
}

StudentService

package com.example.service;

import com.example.mapper.StudentMapper;
import com.example.pojo.Course;
import com.example.pojo.Information;
import com.example.pojo.Student;
import com.example.pojo.Teacher;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

@Service
public class StudentService {
    @Autowired
    private StudentMapper studentMapper;
    ;

    public Student getName(String username) {
        return studentMapper.getName(username);
    }

    public void update(Student student) {
        String studentID = student.getStudentID();
        String studentName = student.getStudentName();
        String studentSex = student.getStudentSex();
        String studentClass = student.getStudentClass();
        String studentMajor = student.getStudentMajor();
        studentMapper.update(studentID, studentName, studentSex, studentClass, studentMajor);
    }

    public Course selectCourse(String name) {
        return studentMapper.selectCourse(name);
    }

    public Teacher selectAll(String name) {
        return studentMapper.selectAll(name);
    }

    public List<Course> select() {
        return studentMapper.select();
    }

    public void choose1(Information information) {
        String courseID = information.getCourseID();
        String TeacherID = information.getTeacherID();
        String studentID = information.getStudentID();
        studentMapper.choose1(courseID, TeacherID, studentID);
    }

    public void updateCourse(String id, String count) {
        studentMapper.updateCourse(id, count);
    }

    public Course cc(String id) {
        return studentMapper.cc(id);
    }

    public List<Information> getInformation(String name) {
        return studentMapper.getInformation(name);
    }
}