src/main/java/com/system/service/impl/TeacherServiceImpl.java

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package com.system.service.impl;

import com.system.exception.CustomException;
import com.system.mapper.CollegeMapper;
import com.system.mapper.CourseMapper;
import com.system.mapper.TeacherMapper;
import com.system.mapper.TeacherMapperCustom;
import com.system.po.*;
import com.system.service.TeacherService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;


@Service
public class TeacherServiceImpl implements TeacherService {

    @Autowired
    private TeacherMapper teacherMapper;

    @Autowired
    private TeacherMapperCustom teacherMapperCustom;

    @Autowired
    private CollegeMapper collegeMapper;

    @Autowired
    private CourseMapper courseMapper;

    public void updateById(Integer id, TeacherCustom teacherCustom) throws Exception {
        teacherMapper.updateByPrimaryKey(teacherCustom);
    }

    public void removeById(Integer id) throws Exception {
        CourseExample courseExample = new CourseExample();

        CourseExample.Criteria criteria = courseExample.createCriteria();
        criteria.andTeacheridEqualTo(id);
        List<Course> list = courseMapper.selectByExample(courseExample);

        if (list.size() != 0) {
            throw new CustomException("请先删除该名老师所教授的课程");
        }

        teacherMapper.deleteByPrimaryKey(id);
    }

    public List<TeacherCustom> findByPaging(Integer toPageNo) throws Exception {
        PagingVO pagingVO = new PagingVO();
        pagingVO.setToPageNo(toPageNo);

        List<TeacherCustom> list = teacherMapperCustom.findByPaging(pagingVO);

        return list;
    }

    public Boolean save(TeacherCustom teacherCustom) throws Exception {