Javascript mongodb没有插入完整的数组
我使用以下命令将499条目插入子文档中,从数组中获取数据 我的代码是这样的,因为数组太长,所以我将设置数组的快捷方式Javascript mongodb没有插入完整的数组,javascript,arrays,node.js,mongodb,Javascript,Arrays,Node.js,Mongodb,我使用以下命令将499条目插入子文档中,从数组中获取数据 我的代码是这样的,因为数组太长,所以我将设置数组的快捷方式 var bodyParser = require('body-parser'); var express = require("express"); var path = require("path"); var session = require('express-session'); var MongoClient = require('mongodb').MongoClie
var bodyParser = require('body-parser');
var express = require("express");
var path = require("path");
var session = require('express-session');
var MongoClient = require('mongodb').MongoClient;
var ObjectId = require('mongodb').ObjectID;
var app = express();
var url = "mongodb://<username>:<password>@ds157342.mlab.com:57342/heroku_4p9ggb81";
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var entery = ['غبة خاتون','حي الربيع','المغرب','القاهرة','الصليخ',.........];
var collection = db.collection('customers');
for (var i = 0 ; i<entery.length; i++){
var query = {"_id" : ObjectId(),"value": entery[i],"key": i}
collection.updateOne({"_id":ObjectId("59ccdf34aabdd50011258cbf")},{ "$push": { "lookupdata": query }},{ upsert: true },
function (err, result) {if (err) throw err;db.close();
});
console.log(i + "- " + entery[i] + " add data finsh ");}
app.listen(process.env.PORT || 3000, function (){
console.log("server is started");});
}
我的问题是,我的代码没有将数组中的所有499项插入LookUpdatea对象,它只输入50项,有时仅输入120项等等,我尝试多次更改编写此代码的方式,但问题仍然是一样的。如果插入/更新数据时不使用回调,请使用异步模块
`var bodyParser = require('body-parser');
var express = require("express");
var path = require("path");
var session = require('express-session');
var MongoClient = require('mongodb').MongoClient;
var ObjectId = require('mongodb').ObjectID;
var async = require('async');
var app = express();
var url = "mongodb://<username>:<password>@ds157342.mlab.com:57342/heroku_4p9ggb81";
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var enteries = ['غبة خاتون','حي الربيع','المغرب','القاهرة','الصليخ',.........];
var collection = db.collection('customers');
async.eachOf(enteries, function(entery, key, callback){
var query = {"value": entery,"key": key}
collection.updateOne({"_id":ObjectId("59ccdf34aabdd50011258cbf")},{ "$push": { "lookupdata": query }},{ upsert: true },
function (err, result) {if (err) throw err;db.close();
});
}, function(err){
if(err) throw err;
});
console.log(i + "- " + entery[i] + " add data finsh ");}
app.listen(process.env.PORT || 3000, function (){
console.log("server is started");});`
首先,使用npm安装安装异步模块-保存异步模块多亏了你,现在我得到了我想要的东西,没有任何问题,如果你告诉我为什么使用这个模块或者我们在这里做了什么,那就太好了,我仍然不明白。@MhadMorph你所做的是插入异步数据,您正在使用for循环,它不会等待查询保存数据并循环值,一次又一次,这就是为什么您会得到不希望的结果,有时它只保存50,有时120。。。
`var bodyParser = require('body-parser');
var express = require("express");
var path = require("path");
var session = require('express-session');
var MongoClient = require('mongodb').MongoClient;
var ObjectId = require('mongodb').ObjectID;
var async = require('async');
var app = express();
var url = "mongodb://<username>:<password>@ds157342.mlab.com:57342/heroku_4p9ggb81";
MongoClient.connect(url, function(err, db) {
if (err) throw err;
var enteries = ['غبة خاتون','حي الربيع','المغرب','القاهرة','الصليخ',.........];
var collection = db.collection('customers');
async.eachOf(enteries, function(entery, key, callback){
var query = {"value": entery,"key": key}
collection.updateOne({"_id":ObjectId("59ccdf34aabdd50011258cbf")},{ "$push": { "lookupdata": query }},{ upsert: true },
function (err, result) {if (err) throw err;db.close();
});
}, function(err){
if(err) throw err;
});
console.log(i + "- " + entery[i] + " add data finsh ");}
app.listen(process.env.PORT || 3000, function (){
console.log("server is started");});`