$比特

该 $bit 运算符用于对整数值执行按位运算。 它可用于通过应用按位 AND、OR 和 XOR 操作更新文档中的整数字段。 $bit之类的按位运算符不是用于递增值，而是用于直接操作位（例如检查、设置或清除特定位）。

Syntax

{
    $bit: {
        < field >: {
            < operator >: < number >
        }
    }
}

参数

例子

请考虑商店集合中的这个示例文档。

{
    "_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
                }
            ]
        }
    ]
}

示例 1：对 partTime 字段执行按位 AND作 totalStaff

db.stores.updateOne({
    _id: "7954bd5c-9ac2-4c10-bb7a-2b79bd0963c5"
}, {
    $bit: {
        "staff.totalStaff.partTime": {
            and: 1
        }
    }
})

此查询返回以下结果。

[
  {
    "acknowledged": true,
    "insertedId": null,
    "matchedCount": "1",
    "modifiedCount": "1",
    "upsertedCount": 0
  }
]

示例 2：对 partTime 字段执行按位 OR作 totalStaff

db.stores.updateOne({
    _id: "7954bd5c-9ac2-4c10-bb7a-2b79bd0963c5"
}, {
    $bit: {
        "staff.totalStaff.partTime": {
            "or": 1
        }
    }
})

此查询返回以下结果。

[
  {
    "acknowledged": true,
    "insertedId": null,
    "matchedCount": "1",
    "modifiedCount": "1",
    "upsertedCount": 0
  }
]

示例 3：对 partTime 字段执行按位 XOR作 totalStaff

db.stores.updateOne({
    _id: "7954bd5c-9ac2-4c10-bb7a-2b79bd0963c5"
}, {
    $bit: {
        "staff.totalStaff.partTime": {
            "xor": 1
        }
    }
})

此查询返回以下结果。

[
  {
    "acknowledged": true,
    "insertedId": null,
    "matchedCount": "1",
    "modifiedCount": "1",
    "upsertedCount": 0
  }
]

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