$bitsAllSet

$bitsAllSet 运算符用于匹配所有指定的位位置均已设置（即为 1）的文档。 此运算符用于对存储整数值的字段执行位运算。 它可用于需要根据整数字段内设置的特定位来筛选文档的场景。

语法

{
  <field>: { $bitsAllSet: <bitmask> }
}

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
                }
            ]
        }
    ]
}

该 storeFeatures 字段是表示各种存储功能的位掩码整数。 每个位对应于一项功能：

示例 1：查找有停车场和厕所的商店

此查询检索 具有停车和厕所 的存储（位 1 和 6）

db.stores.find({
    storeFeatures: {
        $bitsAllSet: [1, 6]
    }
}, {
    _id: 1,
    name: 1,
    storeFeatures: 1
}).limit(5)

等效：

db.stores.find({
    storeFeatures: {
        $bitsAllSet: 66
    }
}, {
    _id: 1,
    name: 1,
    storeFeatures: 1
}).limit(5)

此查询返回的前五个结果为：

[
  {
    "_id": "7e53ca0f-6e24-4177-966c-fe62a11e9af5",
    "name": "Contoso, Ltd. | Office Supply Deals - South Shana",
    "storeFeatures": 86
  },
  {
    "_id": "44fdb9b9-df83-4492-8f71-b6ef648aa312",
    "name": "Fourth Coffee | Storage Solution Gallery - Port Camilla",
    "storeFeatures": 222
  },
  {
    "_id": "728c068a-638c-40af-9172-8ccfa7dddb49",
    "name": "Contoso, Ltd. | Book Store - Lake Myron",
    "storeFeatures": 239
  },
  {
    "_id": "a2b54e5c-36cd-4a73-b547-84e21d91164e",
    "name": "Contoso, Ltd. | Baby Products Corner - Port Jerrold",
    "storeFeatures": 126
  },
  {
    "_id": "dda2a7d2-6984-40cc-bbea-4cbfbc06d8a3",
    "name": "Contoso, Ltd. | Home Improvement Closet - Jaskolskiview",
    "storeFeatures": 107
  }
]

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