$cond - 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。

$cond

Amazon DocumentDB 中的$cond運算子用於評估條件式表達式，並傳回兩個可能的結果表達式之一。

參數

  • if：要評估的布林表達式。

  • then：如果表達式為 true，則傳回的if表達式。

  • else：如果表達式為 false，則傳回的if表達式。

範例 (MongoDB Shell)

下列範例示範如何使用 $cond運算子，根據一個人的年齡傳回值。

建立範例文件

db.people.insertMany([
  { _id: 1, name: "John Doe", age: 35 },
  { _id: 2, name: "Jane Doe", age: 25 },
  { _id: 3, name: "Bob Smith", age: 65 }
]);

查詢範例

db.people.aggregate([
  {
    $project: {
      name: 1,
      ageGroup: {
        $cond: {
          if: { $lt: ["$age", 30] },
          then: "young",
          else: {
            $cond: {
              if: { $lt: ["$age", 65] },
              then: "middle-aged",
              else: "elderly"
            }
          }
        }
      }
    }
  }
])

輸出

[
  { "_id" : 1, "name" : "John Doe", "ageGroup" : "middle-aged" },
  { "_id" : 2, "name" : "Jane Doe", "ageGroup" : "young" },
  { "_id" : 3, "name" : "Bob Smith", "ageGroup" : "elderly" }
]

程式碼範例

若要檢視使用 $cond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 example() {
  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('people');

  const result = await collection.aggregate([
    { $project: {
        name: 1,
        ageGroup: {
            $cond: {
                if: { $lt: ["$age", 30] },
                then: "young",
                else: {
                    $cond: {
                        if: { $lt: ["$age", 65] },
                        then: "middle-aged",
                        else: "elderly"
                    }
                }
            }
        }
      }
    }
  ]).toArray();

  console.log(result);
  client.close();
}

example();
Python
from pymongo import MongoClient


def example():
    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.people

    result = list(collection.aggregate([
        {
            '$project': {
                'name': 1,
                'ageGroup': {
                    '$cond': {
                        'if': { '$lt': ["$age", 30]},
                        'then': "young",
                        'else': {
                            '$cond': {
                                'if': { '$lt': ["$age", 65]},
                                'then': "middle-aged",
                                'else': "elderly"
                            }
                        }
                    }
                }
            }
        }
    ]))

    print(result)
    client.close()

example()