const path = require("path");
const Database = require('sqlite-async')
// 这里是 service 层，专门用来和数据库打交道的

class UserFileService {
  constructor () {}

  // 查询所有用户以及他们的文件
  async findAllUsersFiles () {
    const db = await Database.open(path.resolve(__dirname, '../data.db'));
    const files = [];
    // 查询所有的用户名
    const users = await db.all("SELECT * FROM users");
    for (let user of users) {
      // 遍历所有的用户名，根据用户名去查找他们的文件
      const userFiles = await db.all("SELECT * FROM "+user.username);
      console.log(userFiles)
      // push 方法是往数组里添加元素，files = [], files.push(username:xxx ,files:{[xxx]}), files = [username:xxx ,files:{[xxx]}]
      files.push({
        username: user.username,
        files: userFiles
      })
      console.log(files)
    }
    return files;
  }
}

module.exports = new UserFileService();//对外共享