用springboot，vue，mybatis和elementUI实现上传PDF文件到数据库，需要上传到数据库的内容有文件名，文件上传时间，文件路径，上传者的编号，上传者编号为varchar型。请告诉我springboot配置文件，domain代码，controller代码，service代码，前端vue和element代码，mybatis代码和数据库建表语句，并用注释讲解

很高兴为您提供解答。以下是您所需的代码和注释：

1. SpringBoot配置文件

application.properties

# 数据库配置
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

# MyBatis配置
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.type-aliases-package=com.example.demo.domain

# 文件上传配置
spring.servlet.multipart.enabled=true
spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=10MB
spring.servlet.multipart.file-size-threshold=2KB

2. Domain代码

File.java

package com.example.demo.domain;

import java.util.Date;

public class File {
    private Integer id;
    private String fileName;
    private Date uploadTime;
    private String filePath;
    private String uploaderId;

    // getter和setter方法省略
}

3. Controller代码

FileController.java

package com.example.demo.controller;

import com.example.demo.domain.File;
import com.example.demo.service.FileService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

@RestController
@RequestMapping("/file")
public class FileController {
    @Autowired
    private FileService fileService;

    @PostMapping("/upload")
    public String upload(@RequestParam("file") MultipartFile multipartFile, @RequestParam("uploaderId") String uploaderId) {
        // 获取文件名
        String fileName = multipartFile.getOriginalFilename();
        // 获取当前时间
        Date uploadTime = new Date();
        // 生成文件路径
        String filePath = "D:/upload/" + new SimpleDateFormat("yyyyMMdd").format(uploadTime) + "/" + fileName;
        // 创建文件对象
        File file = new File(filePath);
        // 判断目录是否存在，不存在则创建
        if (!file.getParentFile().exists()) {
            file.getParentFile().mkdirs();
        }
        try {
            // 将文件保存到磁盘
            multipartFile.transferTo(file);
            // 将文件信息保存到数据库
            File fileEntity = new File();
            fileEntity.setFileName(fileName);
            fileEntity.setUploadTime(uploadTime);
            fileEntity.setFilePath(filePath);
            fileEntity.setUploaderId(uploaderId);
            fileService.save(fileEntity);
            return "上传成功";
        } catch (IOException e) {
            e.printStackTrace();
            return "上传失败";
        }
    }
}

4. Service代码

FileService.java

package com.example.demo.service;

import com.example.demo.domain.File;

public interface FileService {
    void save(File file);
}

FileServiceImpl.java

package com.example.demo.service.impl;

import com.example.demo.dao.FileDao;
import com.example.demo.domain.File;
import com.example.demo.service.FileService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class FileServiceImpl implements FileService {
    @Autowired
    private FileDao fileDao;

    @Override
    public void save(File file) {
        fileDao.save(file);
    }
}

5. 前端Vue和Element代码

<template>
  <div>
    <el-upload
      class="upload-demo"
      action="/file/upload"
      :headers="{ 'Content-Type': 'multipart/form-data' }"
      :data="{ uploaderId: uploaderId }"
      :on-success="handleSuccess"
      :on-error="handleError"
      :before-upload="beforeUpload"
      :file-list="fileList"
      multiple>
      <el-button size="small" type="primary">点击上传</el-button>
      <div slot="tip" class="el-upload__tip">只能上传PDF文件，且不超过10MB</div>
    </el-upload>
  </div>
</template>

<script>
export default {
  data() {
    return {
      uploaderId: '123',
      fileList: []
    }
  },
  methods: {
    handleSuccess(response, file, fileList) {
      this.$message.success('上传成功');
      this.fileList = fileList;
    },
    handleError(error, file, fileList) {
      this.$message.error('上传失败');
    },
    beforeUpload(file) {
      const isPDF = file.type === 'application/pdf';
      const isLt10M = file.size / 1024 / 1024 < 10;
      if (!isPDF) {
        this.$message.error('只能上传PDF文件');
      }
      if (!isLt10M) {
        this.$message.error('文件大小不能超过10MB');
      }
      return isPDF && isLt10M;
    }
  }
}
</script>

6. MyBatis代码

FileDao.java

package com.example.demo.dao;

import com.example.demo.domain.File;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;

@Mapper
public interface FileDao {
    @Insert("INSERT INTO file(file_name, upload_time, file_path, uploader_id) VALUES(#{fileName}, #{uploadTime}, #{filePath}, #{uploaderId})")
    void save(File file);
}

7. 数据库建表语句

CREATE TABLE `file` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `file_name` varchar(255) NOT NULL,
  `upload_time` datetime NOT NULL,
  `file_path` varchar(255) NOT NULL,
  `uploader_id` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

希望这些代码和注释能够帮助您实现上传PDF文件到数据库的功能。