Question

我所拥有的是1000个不同领域的数据。我意识到，如果从excel导入的数据是字符串，我无法获得我的mongodb中的平均值。什么是让我的所有1000个数据都成为数字的最简单方法。

到目前为止：

Server.js

var express = require('express');
var app = express();
var mongojs = require('mongojs');
var db = mongojs('meibanlist', ['contact']);
var bodyParser = require('body-parser');
var async  = require('async');


app.use(express.static(__dirname + '/public'));
app.use(bodyParser.json());

app.get('/meibanlist', function (req, res) {
  console.log('I received a GET request');

  db.meibanlist.find(function (err, docs) {
    console.log(docs);
    res.json(docs);
  });
});


app.post('/meibanlist', function (req, res) {
  console.log(req.body);
  db.meibanlist.insert(req.body, function(err, doc) {
    res.json(doc);
  });
});

app.delete('/meibanlist/', function (req, res) {
  console.log();
  db.meibanlist.remove(function (err, doc) {
    res.json(doc);
  });
});

app.get('/meibanlist/', function (req, res) {
  console.log();
  db.meibanlist.findOne(function (err, doc) {
    res.json(doc);
  });
});

app.put('/meibanlist/', function (req, res) {
  console.log(req.body.machine_Id);
  db.meibanlist.findAndModify({
    query: {_id: mongojs.machine_Id},
    update: {$set: {machine_Id: req.body.machine_Id, air_Temp: req.body.air_Temp, water_Temp: req.body.water_Temp, heat_Temp: req.body.heat_Temp, room_Temp: req.body.room_Temp, date:req.body.date, time: req.body.time}},
    new: true}, function (err, doc) {
      res.json(doc);
    }
  );
});  
  app.get('/convertStringsToNumbe' , function(req, res){
      var recUpdated = 0;
      db.contact.find({}, function(err , meibanlist){
    if(meibanlist.length){
        async.eachSeries(meibanlist , function(listItem , cb){
            if(listItem && typeof listItem.air_Temp == 'string'){
                db.contact.update( 
                   { machine_Id: listItem.machine_Id}, 
                   { $set : { "air_Temp" : parseInt(listItem.air_Temp) } }
                ,function(err , updatedRec){
                    recUpdated++;
                    cb();
                });
            }
            else{
              console.log('already String')
              cb();
            }
        } , function(){
            console.log('operation completed, records updated count = ' + recUpdated);
            return true;
        })
    }   
    else{
        console.log('no data returned');
    }
  })
  });

app.listen(3000);
console.log('3000');

的index.html

<!DOCTYPE>
<html ng-app="myApp">
<head>
<!-- Latest compiled and minified CSS -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap.min.css">

<!-- Optional theme -->
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.1/css/bootstrap-theme.min.css">

  <title>Meiban App</title>
</head>
<body>
  <div class="container" ng-controller="AppCtrl">
    <h1>Meiban App</h1>

    <table class="table">
      <thead>
        <tr>
          <th>machine_Id</th>         
          <th>air_temp</th>
          <th>water_temp</th>        
          <th>heat_temp</th>
          <th>room_temp</th>
          <th>date</th>
          <th>time</th>
          <th>Action</th>
          <th>&nbsp;</th>
        </tr>
      </thead>
      <tbody>
        <tr>
          <td><input class="form-control" ng-model="contact.machine_Id" ></td>
          <td><input class="form-control" ng-model="contact.air_temp"></td>
          <td><input class="form-control" ng-model="contact.water_temp"></td>
          <td><input class="form-control" ng-model="contact.heat_temp"></td>
          <td><input class="form-control" ng-model="contact.room_temp"></td>
          <td><input class="form-control" ng-model="contact.time"></td>
          <td><input class="form-control" ng-model="contact.date"></td>
          <td><button class="btn btn-primary" ng-click="addContact()">Add Collection</button></td>
          <td><button class="btn btn-info" ng-click="update()">Update</button>&nbsp;&nbsp;<button class="btn btn-info" ng-click="deselect()">Clear</button></td>
        </tr>
        <tr ng-repeat="contact in meibanlist">
          <td>{{contact.machine_Id }}</td>
          <td>{{contact.air_temp}}</td>
          <td>{{contact.water_temp}}</td>
          <td>{{contact.heat_temp}}</td>
          <td>{{contact.room_temp}}</td>
          <td>{{contact.date}}</td>
          <td>{{contact.time}}</td>
          <td><button class="btn btn-danger" ng-click="remove(contact._id)">Remove</button></td>
          <td><button class="btn btn-warning" ng-click="edit(contact._id)">Edit</button></td>
        </tr>
      </tbody>
    </table>

  </div>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.3.12/angular.min.js"></script>
<script src="controller/controller.js"></script>
</body>
</html>

controller.js

var myApp = angular.module('myApp', []);
myApp.controller('AppCtrl', ['$scope', '$http', function($scope, $http) {
    console.log("Hello World from controller");


var refresh = function() {
  $http.get('/contactlist').success(function(response) {
    console.log("I got the data I requested");
    $scope.contactlist = response;
    $scope.contact = "";
  });
};

refresh();

$scope.addContact = function() {
  console.log($scope.contact);
  $http.post('/contactlist', $scope.contact).success(function(response) {
    console.log(response);
    refresh();
  });
};

$scope.remove = function(id) {
  console.log(id);
  $http.delete('/contactlist/' + id).success(function(response) {
    refresh();
  });
};

$scope.edit = function(id) {
  console.log(id);
  $http.get('/contactlist/' + id).success(function(response) {
    $scope.contact = response;
  });
};  

$scope.update = function() {
  console.log($scope.contact._id);
  $http.put('/contactlist/' + $scope.contact._id, $scope.contact).success(function(response) {
    refresh();
  });
};

$scope.deselect = function() {
  $scope.contact = "";
};

}]);

它给了我这个错误：

TypeError: db.contact.find(...).then is not a function
   at /home/balkis96/FYP/Meiban/server.js:55:27
   at Layer.handle [as handle_request] (/home/balkis96/node_modules/express/lib/router/layer.js:95:5)
   at next (/home/balkis96/node_modules/express/lib/router/route.js:131:13)
   at Route.dispatch (/home/balkis96/node_modules/express/lib/router/route.js:112:3)
   at Layer.handle [as handle_request] (/home/balkis96/node_modules/express/lib/router/layer.js:95:5)
   at /home/balkis96/node_modules/express/lib/router/index.js:277:22
   at Function.process_params (/home/balkis96/node_modules/express/lib/router/index.js:330:12)
   at next (/home/balkis96/node_modules/express/lib/router/index.js:271:10)
   at jsonParser (/home/balkis96/node_modules/body-parser/lib/types/json.js:103:7)
   at Layer.handle [as handle_request] (/home/balkis96/node_modules/express/lib/router/layer.js:95:5)

Answer 1

执行npm install async --save

  var async  = require('async');

  app.get('/convertStringsToNumbe' , function(req, res){
      var recUpdated = 0;
      db.contact.find({}).then(function(meibanlist){
        if(meibanlist.length){
            async.eachSeries(meibanlist , function(listItem , cb){
                if(listItem && typeof listItem.air_Temp == 'string'){
                    db.contact.update( 
                       { machine_Id: listItem.machine_Id}, 
                       { $set : { "air_Temp" : parseInt(listItem.air_Temp) } }
                    ).then(function(){
                        recUpdated++;
                        cb();
                    });
                }
                else{
                  console.log('already String')
                  cb();
                }
            } , function(){
                console.log('operation completed, records updated count = ' + recUpdated);
                return true;
            })
        }   
        else{
            console.log('no data returned);
        }
      })
  });

使用邮递员或只是在浏览器中点击此路线

在nodejs中从字符串转换为数字的最简单方法，所以我可以做$ avg

1 个答案: