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mongodb怎么獲取表中記錄數(shù)

小億
122
2023-11-16 11:09:27
欄目: 云計算

在MongoDB中，獲取集合中的記錄數(shù)可以使用countDocuments()方法。該方法返回一個promise，可以使用then()方法來獲取結(jié)果。

以下是一個示例：

const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb+srv://<username>:<password>@<cluster-url>/<database>?retryWrites=true&w=majority";

MongoClient.connect(uri, function(err, client) {
  if(err) {
    console.log('Error occurred while connecting to MongoDB Atlas...\n',err);
  }
  console.log('Connected to MongoDB Atlas...');
  
  const collection = client.db("<database>").collection("<collection>");

  collection.countDocuments()
    .then(count => {
      console.log("Number of documents in the collection: ", count);
    })
    .catch(err => {
      console.log("Error occurred while counting documents:\n", err);
    })
    .finally(() => {
      client.close();
    });
});

請注意，<username>、<password>、<cluster-url>、<database>和<collection>都需要替換為適當(dāng)?shù)闹怠?/p>

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