$millisecond - Amazon DocumentDB
範例 (MongoDB Shell)程式碼範例

本文為英文版的機器翻譯版本，如內容有任何歧義或不一致之處，概以英文版為準。

$millisecond

Amazon DocumentDB 中的$millisecond運算子用於擷取日期值的毫秒部分。

參數

無

範例 (MongoDB Shell)

此範例示範如何使用 $millisecond運算子擷取日期值的毫秒部分。

建立範例文件

db.events.insert([
  {
    "name": "Event 1",
    "timestamp": ISODate("2023-04-21T10:30:15.123Z")
  },
  {
    "name": "Event 2",
    "timestamp": ISODate("2023-04-21T10:30:15.456Z")
  },
  {
    "name": "Event 3",
    "timestamp": ISODate("2023-04-21T10:30:15.789Z")
  }
])

查詢範例

db.events.aggregate([
  {
    $project: {
      name: 1,
      milliseconds: { $millisecond: "$timestamp" }
    }
  }
])

輸出

[
  {
    "_id": ObjectId("644332a42054ed1b0d15f0c1"),
    "name": "Event 1",
    "milliseconds": 123
  },
  {
    "_id": ObjectId("644332a42054ed1b0d15f0c2"),
    "name": "Event 2",
    "milliseconds": 456
  },
  {
    "_id": ObjectId("644332a42054ed1b0d15f0c3"),
    "name": "Event 3",
    "milliseconds": 789
  }
]

程式碼範例

若要檢視使用 $millisecond命令的程式碼範例，請選擇您要使用的語言標籤：

Node.js
const { MongoClient } = require('mongodb');

async function main() {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const events = db.collection('events');

  const result = await events.aggregate([
    {
      $project: {
        name: 1,
        milliseconds: { $millisecond: '$timestamp' }
      }
    }
  ]).toArray();

  console.log(result);

  await client.close();
}

main();
Python
from pymongo import MongoClient

client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
db = client['test']
events = db['events']

result = list(events.aggregate([
    {
        '$project': {
            'name': 1,
            'milliseconds': { '$millisecond': '$timestamp' }
        }
    }
]))

print(result)

client.close()