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[英]Mongodb group collection entries by day from timestamp, performance optimisation
[英]Cannot retrieve all entries from MongoDB collection
我正在尝试从 mongo 检索所有条目,但我不断收到一个错误,在有一些条目时我找不到任何错误。
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();
});
}
这是我得到的错误:服务器正在侦听端口 3030! 成功连接服务器找不到玩具
感谢任何形式的帮助!
在从服务器获得响应之前,您正在关闭 mongo 连接。 移动client.close();
在toArray
回调中。
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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