當使用MongoClientv3.0時，db.Collection不是函數(shù)我一直在努力W3學校教程關(guān)于MongoDB的NodeJS。當我試圖在NodeJS環(huán)境中實現(xiàn)這個示例并使用Ajax調(diào)用該函數(shù)時，我得到了以下錯誤：TypeError: db.collection is not a function
at c:\Users\user\Desktop\Web Project\WebService.JS:79:14
at args.push (c:\Users\user\node_modules\mongodb\lib\utils.js:431:72)
at c:\Users\user\node_modules\mongodb\lib\mongo_client.js:254:5
at connectCallback (c:\Users\user\node_modules\mongodb\lib\mongo_client.js:933:5)
at c:\Users\user\node_modules\mongodb\lib\mongo_client.js:794:11
at _combinedTickCallback (internal/process/next_tick.js:73:7)
at process._tickCallback (internal/process/next_tick.js:104:9)請在下面找到我的實現(xiàn)代碼：var MongoClient = require('mongodb').MongoClient;var url = "mongodb://localhost:27017/mytestingdb";MongoClient.connect(url, function(err, db) {
if (err) throw err;
db.collection("customers").findOne({}, function(err, result) {
if (err) throw err;
console.log(result.name);
db.close();
});});請注意，每當執(zhí)行命中時，錯誤就會發(fā)生：db.collection("customers").findOne({}, function(err, result) {}另外，請注意(如果這很重要)，我已經(jīng)為節(jié)點JS安裝了最新的MongoDB包(NPM安裝MongoDB)，而MongoDB版本是MongoDBEnterprise3.4.4，MongoDBNode.js驅(qū)動程序v3.0.0-rc0。
3 回答
慕姐8265434
TA貢獻1813條經(jīng)驗 獲得超2個贊
斯蒂芬大帝
TA貢獻1827條經(jīng)驗 獲得超8個贊
MongoClient.connect()dbclientdb(dbname)db
const MongoClient = require('mongodb').MongoClient;const assert = require('assert');
// Connection URLconst url = 'mongodb://localhost:27017';
// Database Nameconst dbName = 'myproject';
// Use connect method to connect to the serverMongoClient.connect(url, function(err, client) {
assert.equal(null, err);
console.log("Connected successfully to server");
const db = client.db(dbName);
client.close();});- 3 回答
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