我有一个数据库包装类,建立一个连接到一些MongoDB实例:

async connect(connectionString: string): Promise<void> {
        this.client = await MongoClient.connect(connectionString)
        this.db = this.client.db()
}

这给了我一个警告:

(node:4833) DeprecationWarning:当前URL字符串解析器已弃用,并将在未来版本中删除。要使用新的解析器,将选项{useNewUrlParser: true}传递给MongoClient.connect。

connect()方法接受一个MongoClientOptions实例作为第二个参数。但它没有useNewUrlParser属性。我还尝试在连接字符串中设置这些属性,就像这样:mongodb://127.0.0.1/my-db?useNewUrlParser=true,但它对那些警告没有影响。

那么我怎么能设置useneurlparser删除这些警告?这对我来说很重要,因为脚本应该以cron的方式运行,而这些警告会导致垃圾邮件。

我使用3.1.0-beta4版本的mongodb驱动程序,并在3.0.18中使用相应的@types/mongodb包。它们都是npm install可用的最新版本。

解决方案

使用旧版本的mongodb驱动程序:

"mongodb": "~3.0.8",
"@types/mongodb": "~3.0.18"

当前回答

你需要在猫鼬.connect()方法中添加{useNewUrlParser: true}。

mongoose.connect('mongodb://localhost:27017/Notification',{ useNewUrlParser: true });

其他回答

const mongoose = require('mongoose');

mongoose
  .connect(connection_string, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true,
    useFindAndModify: false,
  })
  .then((con) => {
    console.log("connected to db");
  });

试着用这个

以下为我的工作 对于猫鼬版本5.9.16

const mongoose = require('mongoose');

mongoose.set('useNewUrlParser', true);
mongoose.set('useFindAndModify', false);
mongoose.set('useCreateIndex', true);
mongoose.set('useUnifiedTopology', true);

mongoose.connect('mongodb://localhost:27017/dbName')
    .then(() => console.log('Connect to MongoDB..'))
    .catch(err => console.error('Could not connect to MongoDB..', err))

(node:16596) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect. (Use node --trace-deprecation ... to show where the warning was created) (node:16596) [MONGODB DRIVER] Warning: Current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.

用法:

async connect(connectionString: string): Promise<void> {
        this.client = await MongoClient.connect(connectionString, {
    useUnifiedTopology: true,
    useNewUrlParser: true,
  })
        this.db = this.client.db()
}

下面突出显示的猫鼬连接代码解决了猫鼬驱动程序的警告:

mongoose.connect('mongodb://localhost:27017/test', { useNewUrlParser: true });

这几行代码同样适用于所有其他弃用警告:

const db = await mongoose.createConnection(url, { useNewUrlParser: true });
mongoose.set('useCreateIndex', true);
mongoose.set('useFindAndModify', false);