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。
$dayOfWeek
Amazon DocumentDB 中的$dayOfWeek運算子會從指定的日期欄位中擷取一週中的某一天。它以介於 1 （週日） 和 7 （週六） 之間的數字傳回星期幾，這是與 MongoDB 中相同的行為。
參數
範例 (MongoDB Shell)
此範例示範如何使用 $dayOfWeek 運算子，從weather集合中的 date 欄位擷取星期幾。
建立範例文件
db.weather.insertMany([
{
"temperature": 97.5,
"humidity": 0.60,
"date": new Date("2023-04-01")
},
{
"temperature": 95.2,
"humidity": 0.55,
"date": new Date("2023-04-02")
},
{
"temperature": 92.8,
"humidity": 0.65,
"date": new Date("2023-04-03")
}
]);
查詢範例
db.weather.aggregate([
{
$project: {
dayOfWeek: { $dayOfWeek: "$date" }
}
}
]).pretty();
輸出
{ "_id" : ObjectId("64272c6663f4f8ce422c2d91"), "dayOfWeek" : 7 }
{ "_id" : ObjectId("64272c6663f4f8ce422c2d92"), "dayOfWeek" : 1 }
{ "_id" : ObjectId("64272c6663f4f8ce422c2d93"), "dayOfWeek" : 2 }
程式碼範例
若要檢視使用 $dayOfWeek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 collection = db.collection('weather');
const result = await collection.aggregate([
{
$project: {
dayOfWeek: { $dayOfWeek: '$date' }
}
}
]).toArray();
console.log(result);
await client.close();
}
main();
- Python
-
from pymongo import MongoClient
def main():
client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
db = client.test
collection = db.weather
result = list(collection.aggregate([
{
'$project': {
'dayOfWeek': { '$dayOfWeek': '$date' }
}
}
]))
print(result)
client.close()
if __name__ == '__main__':
main()
