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。
$radiansToDegrees
8.0.1 版的新功能。
Amazon DocumentDB 中的$radiansToDegrees運算子會將值從弧度轉換為度數。
參數
範例 (MongoDB Shell)
下列範例示範如何使用 $radiansToDegrees運算子將弧度值轉換為度數。
建立範例文件
db.angles.insertMany([
{ "_id": 1, "radians": 0 },
{ "_id": 2, "radians": 1.5707963267948966 },
{ "_id": 3, "radians": 3.141592653589793 },
{ "_id": 4, "radians": 6.283185307179586 }
]);
查詢範例
db.angles.aggregate([
{ $project: {
"degrees": { $radiansToDegrees: "$radians" }
}}
]);
輸出
[
{ "_id": 1, "degrees": 0 },
{ "_id": 2, "degrees": 90 },
{ "_id": 3, "degrees": 180 },
{ "_id": 4, "degrees": 360 }
]
程式碼範例
若要檢視使用 $radiansToDegrees 運算子的程式碼範例，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('angles');
const result = await collection.aggregate([
{ $project: {
"degrees": { $radiansToDegrees: "$radians" }
}}
]).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['angles']
result = list(collection.aggregate([
{ '$project': {
'degrees': { '$radiansToDegrees': '$radians' }
}}
]))
print(result)
client.close()
if __name__ == "__main__":
main()
