$nin - 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。

$nin

$nin 運算子用於比對不在指定陣列中的值。這是$in運算子的反向，其符合指定陣列中的值。

規劃器 2.0 版已新增 的索引支援。 $nin

參數

  • field：要檢查的欄位。

  • array：要檢查的值陣列。

 

欄位名稱中的美元 ($)

欄位名稱中的 Dollar($) 和 dot(.) 如需在巢狀物件$nin中查詢字$首欄位的限制，請參閱 。

範例 (MongoDB Shell)

下列範例示範如何使用 $nin運算子來尋找category欄位不等於 "Fiction" 或 "Mystery" 的文件。

建立範例文件

db.books.insertMany([
  { title: "The Great Gatsby", author: "F. Scott Fitzgerald", category: "Fiction" },
  { title: "To Kill a Mockingbird", author: "Harper Lee", category: "Fiction" },
  { title: "The Girl on the Train", author: "Paula Hawkins", category: "Mystery" },
  { title: "The Martian", author: "Andy Weir", category: "Science Fiction" },
  { title: "The Alchemist", author: "Paulo Coelho", category: "Philosophy" }
])

查詢範例

db.books.find({
  category: {
    $nin: ["Fiction", "Mystery"]
  }
})

輸出

[
  {
    _id: ObjectId('...'),
    title: 'The Martian',
    author: 'Andy Weir',
    category: 'Science Fiction'
  },
  {
    _id: ObjectId('...'),
    title: 'The Alchemist',
    author: 'Paulo Coelho',
    category: 'Philosophy'
  }
]

程式碼範例

若要檢視使用 $nin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 findBooksNotInCategories(categories) {
  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 books = await db.collection('books').find({
    category: {
      $nin: categories
    }
  }).toArray();
  console.log(books);
  client.close();
}

findBooksNotInCategories(['Fiction', 'Mystery']);
Python
from pymongo import MongoClient

def find_books_not_in_categories(categories):
    client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
    db = client['test']
    books = list(db.books.find({
        'category': {
            '$nin': categories
        }
    }))
    print(books)
    client.close()

find_books_not_in_categories(['Fiction', 'Mystery'])