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。
$not
$not 彙總運算子會對表達式執行邏輯 NOT 操作。true 如果表達式評估為 false，且false如果表達式評估為 ，則傳回 true。
參數
範例 (MongoDB Shell)
下列範例示範如何使用 $not運算子反轉布林值。
建立範例文件
db.users.insertMany([
{ _id: 1, name: "Alice", active: true },
{ _id: 2, name: "Bob", active: false },
{ _id: 3, name: "Charlie", active: true }
]);
查詢範例
db.users.aggregate([
{
$project: {
name: 1,
active: 1,
inactive: { $not: ["$active"] }
}
}
]);
輸出
[
{ _id: 1, name: 'Alice', active: true, inactive: false },
{ _id: 2, name: 'Bob', active: false, inactive: true },
{ _id: 3, name: 'Charlie', active: true, inactive: false }
]
程式碼範例
若要檢視使用$not彙總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 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('users');
const result = await collection.aggregate([
{
$project: {
name: 1,
active: 1,
inactive: { $not: ["$active"] }
}
}
]).toArray();
console.log(result);
await 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['users']
result = list(collection.aggregate([
{
'$project': {
'name': 1,
'active': 1,
'inactive': { '$not': ['$active'] }
}
}
]))
print(result)
client.close()
example()
