$bitNot

Operator $bitNot melakukan operasi BITWISE NOT pada nilai bilangan bulat. Ini membalikkan semua bit operand, mengubah 1 menjadi 0s dan 0s menjadi 1s. Hasilnya adalah pelengkap bitwise dari nilai input.

Syntax

{
  $bitNot: <expression>
}

Parameter-parameternya

Examples

Pertimbangkan dokumen sampel ini dari koleksi toko.

{
    "_id": "0fcc0bf0-ed18-4ab8-b558-9848e18058f4",
    "name": "First Up Consultants | Beverage Shop - Satterfieldmouth",
    "location": {
        "lat": -89.2384,
        "lon": -46.4012
    },
    "staff": {
        "totalStaff": {
            "fullTime": 8,
            "partTime": 20
        }
    },
    "sales": {
        "totalSales": 75670,
        "salesByCategory": [
            {
                "categoryName": "Wine Accessories",
                "totalSales": 34440
            },
            {
                "categoryName": "Bitters",
                "totalSales": 39496
            },
            {
                "categoryName": "Rum",
                "totalSales": 1734
            }
        ]
    },
    "promotionEvents": [
        {
            "eventName": "Unbeatable Bargain Bash",
            "promotionalDates": {
                "startDate": {
                    "Year": 2024,
                    "Month": 6,
                    "Day": 23
                },
                "endDate": {
                    "Year": 2024,
                    "Month": 7,
                    "Day": 2
                }
            },
            "discounts": [
                {
                    "categoryName": "Whiskey",
                    "discountPercentage": 7
                },
                {
                    "categoryName": "Bitters",
                    "discountPercentage": 15
                },
                {
                    "categoryName": "Brandy",
                    "discountPercentage": 8
                },
                {
                    "categoryName": "Sports Drinks",
                    "discountPercentage": 22
                },
                {
                    "categoryName": "Vodka",
                    "discountPercentage": 19
                }
            ]
        },
        {
            "eventName": "Steal of a Deal Days",
            "promotionalDates": {
                "startDate": {
                    "Year": 2024,
                    "Month": 9,
                    "Day": 21
                },
                "endDate": {
                    "Year": 2024,
                    "Month": 9,
                    "Day": 29
                }
            },
            "discounts": [
                {
                    "categoryName": "Organic Wine",
                    "discountPercentage": 19
                },
                {
                    "categoryName": "White Wine",
                    "discountPercentage": 20
                },
                {
                    "categoryName": "Sparkling Wine",
                    "discountPercentage": 19
                },
                {
                    "categoryName": "Whiskey",
                    "discountPercentage": 17
                },
                {
                    "categoryName": "Vodka",
                    "discountPercentage": 23
                }
            ]
        }
    ]
}

Contoh 1: Operasi BITWISE NOT dasar

Kueri ini melakukan inversi bitwise pada bidang jumlah staf untuk dokumen penyimpanan tertentu. Nilai terbalik dapat digunakan untuk bendera izin khusus, pengalih fitur, atau operasi bitmask. Bitwise TIDAK dari 14 hasil adalah -15, dan bitwise TIDAK dari 8 hasil dalam -9. Hasil yang diamati disebabkan oleh representasi pelengkap dua di mana ~n = -(n+1).

db.stores.aggregate([{
        $match: {
            _id: "26afb024-53c7-4e94-988c-5eede72277d5"
        }
    },
    {
        $project: {
            name: 1,
            fullTimeStaff: "$staff.totalStaff.fullTime",
            partTimeStaff: "$staff.totalStaff.partTime",
            invertedFullTime: {
                $bitNot: "$staff.totalStaff.fullTime"
            },
            invertedPartTime: {
                $bitNot: "$staff.totalStaff.partTime"
            }
        }
    }
])

Kueri ini mengembalikan hasil berikut.

[
  {
    "_id": "26afb024-53c7-4e94-988c-5eede72277d5",
    "name": "First Up Consultants | Microphone Bazaar - South Lexusland",
    "fullTimeStaff": 14,
    "partTimeStaff": 8,
    "invertedFullTime": -15,
    "invertedPartTime": -9
  }
]

Contoh 2: Menggunakan $bitNot dengan persentase diskon

Kueri ini mengekstrak dan memproses informasi diskon untuk penyimpanan tertentu dan menerapkan operasi BITWISE NOT pada setiap persentase diskon. Operasi BITWISE NOT menginversi semua bit: 20 menjadi -21 dan 17 menjadi -18.

db.stores.aggregate([{
        $match: {
            _id: "26afb024-53c7-4e94-988c-5eede72277d5"
        }
    },
    {
        $unwind: "$promotionEvents"
    },
    {
        $match: {
            "promotionEvents.eventName": "Incredible Savings Showcase"
        }
    },
    {
        $unwind: "$promotionEvents.discounts"
    },
    {
        $project: {
            name: 1,
            eventName: "$promotionEvents.eventName",
            categoryName: "$promotionEvents.discounts.categoryName",
            discountPercentage: "$promotionEvents.discounts.discountPercentage",
            invertedDiscount: {
                $bitNot: "$promotionEvents.discounts.discountPercentage"
            }
        }
    }
])

Kueri ini mengembalikan hasil berikut:

[
  {
    "_id": "26afb024-53c7-4e94-988c-5eede72277d5",
    "name": "First Up Consultants | Microphone Bazaar - South Lexusland",
    "eventName": "Incredible Savings Showcase",
    "categoryName": "Microphone Stands",
    "discountPercentage": 17,
    "invertedDiscount": -18
  },
  {
    "_id": "26afb024-53c7-4e94-988c-5eede72277d5",
    "name": "First Up Consultants | Microphone Bazaar - South Lexusland",
    "eventName": "Incredible Savings Showcase",
    "categoryName": "Condenser Microphones",
    "discountPercentage": 20,
    "invertedDiscount": -21
  }
]