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[英]Mongodb group collection entries by day from timestamp, performance optimisation
[英]Cannot retrieve all entries from MongoDB collection
我正在嘗試從 mongo 檢索所有條目,但我不斷收到一個錯誤,在有一些條目時我找不到任何錯誤。
const { MongoClient } = require('mongodb');
const url = 'mongodb://localhost:27017';
const dbName = 'toy_db';
tryMongo();
function tryMongo() {
MongoClient.connect(url, (err, client) => {
if (err) return console.log('Cannot connect to DB');
console.log('Connected successfully to server');
const db = client.db(dbName);
const collection = db.collection('toy');
collection.find().toArray((err, docs) => {
if (err) return console.log('cannot find toys');
console.log('found these:');
console.log(docs);
});
client.close();
});
}
這是我得到的錯誤:服務器正在偵聽端口 3030! 成功連接服務器找不到玩具
感謝任何形式的幫助!
在從服務器獲得響應之前,您正在關閉 mongo 連接。 移動client.close();
在toArray
回調中。
const { MongoClient } = require('mongodb');
const url = 'mongodb://localhost:27017';
const dbName = 'toy_db';
tryMongo();
function tryMongo() {
MongoClient.connect(url, (err, client) => {
if (err) return console.log(err);
console.log('Connected successfully to server');
const db = client.db(dbName);
const collection = db.collection('toy');
collection.find().toArray((err, docs) => {
if (err) {
console.log(err);
} else {
console.log('found these:');
console.log(docs);
}
client.close();
});
});
}
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