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

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package com.system.service.impl;

import com.system.mapper.CollegeMapper;
import com.system.mapper.StudentMapper;
import com.system.mapper.StudentMapperCustom;
import com.system.po.*;
import com.system.service.StudentService;
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 StudentServiceImpl implements StudentService {

    //使用spring 自动注入
    @Autowired
    private StudentMapperCustom studentMapperCustom;

    @Autowired
    private StudentMapper studentMapper;

    @Autowired
    private CollegeMapper collegeMapper;

    public void updataById(Integer id, StudentCustom studentCustom) throws Exception {
        studentMapper.updateByPrimaryKey(studentCustom);
    }

    public void removeById(Integer id) throws Exception {
        studentMapper.deleteByPrimaryKey(id);
    }

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

        List<StudentCustom> list = studentMapperCustom.findByPaging(pagingVO);

        return list;
    }

    public Boolean save(StudentCustom studentCustoms) throws Exception {
        Student stu = studentMapper.selectByPrimaryKey(studentCustoms.getUserid());
        if (stu == null) {
            studentMapper.insert(studentCustoms);
            return true;
        }

        return false;
    }

    //返回学生总数
    public int getCountStudent() throws Exception {
        //自定义查询对象
        StudentExample studentExample = new StudentExample();
        //通过criteria构造查询条件