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Главная - Вопросы по программированию - Нужно найти размер каждого изображения (более 100 КБ), которое хранится в двоичном виде в mongodb

Нужно найти размер каждого изображения (более 100 КБ), которое хранится в двоичном виде в mongodb

#mongodb #mongodb-query #aggregation-framework

Вопрос:

Я попытался выполнить следующий запрос, но он не удался

 db.getCollection('images').aggregate([
    {
        $project: {
      "practiceId": "$practiceId",
      "imageSize": { $binarySize: "$data" }
    }
    }])

Ошибка, которую я получаю

И мои примерные данные в mongodb выглядят так

 {
    "_id" : ObjectId("60be3c9ea77d6312514276384"),
    "_class" : "com.test.images.model.ImageEntity",
    "practiceId" : NumberLong(242),
    "fileName" : "img.jpg",
    "contentType" : "image/jpeg",
    "data" : { "$binary" : "/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAkGBxITEhUTExMVFhUVFyAYFRcXFxsgIBggICggICAoHx8gJTAqICYxJR8fKjsrMTU3NTU1ICs7QDo1PzA1NjUBCgoKDg0OFxAQFjgdFhorNCsvKys3Ky0rNyszKzctLTMyLS03NzcrLS0rNzc3Kys4KzgrODgrKzg4NjctNy81MP/AABEIAMgAyAMBIgACEQEDEQH/xAAbAAEAAgMBAQAAAAAAAAAAAAAABAUCAwYBB//EADwQAAEDAgQDBQUGBQQDAAAAAAEAAhEDIQQSMUEFUWEGEyJxgTKRobHBB0JSYtHwIzNy4fEUgpLSY6Ky/8QAGQEBAAMBAQAAAAAAAAAAAAAAAAECAwQF/8QAJBEBAQACAgICAgIDAAAAAAAAAAECAxEhEjEEUUFxMoETImH/2gAMAwEAAhEDEQA/APuKIiAiIgIiICIqHtjxr/S0C4HxOs3npJj9evoQce7U0cPLZDnjVo281wvFO11d4zF2UH2GNnTqOfn8FzArPdme /i8UyZJHXXn7lDe9zjlFOTzMlZ3Jrjhz6WNLiFR7iS4Hq9x WZTBxFtNwOhB2cSD6mY8tPgoVPhVVwAawNG8mPcBorXC9nrS8/5WN24xvj8fK/h0vZ/7QKfsVZtuTJHruPjzXc4TF06rc1NwcOYXxPF9nHgksI9LLoewfFXMf3TgQZ066e/4LTDZKy2abj7fU0WLTIWS2YCIiAiIgIiICIiAiIgIiICIiAiIgLgPtJYX1KbPuimXeuYAfvou/XJds8MCc3OnlHvn9 aipnt8yNIlvdxADpHMg/sKxwGGAiBCVmeMxoP8LdRqMbAe4BcW3m16ejxkW F0hS6bFWYDjeFLsodJV931MAui0rLw 2/ T6QarVUjC5cQyqBv4h5f2Ut3HWPJa2k8xqRp7zC9w Ka59MibuLSDsYJHy K01yzJjvymWF 30ukBAjRZrRgv5bJ/CFvXe8oREQEREBERAREQEREBERAREQEREHi5ntriWtFNn335i0dBE/Me9dOvn/ANqtOo0UazdKbXx0dLHD4NcfRVzvE5aasZllxXPYOTTe8jxd44HpEED4qBU4Y9z5zZRF3QJnbXb9 XTcBoCpw9tWQX1JqujSdHRyjL6LDCsBsVzbOZeY7dMl5l/Cqq8OHcBpOarlu8WB5EDYzyMHkLET HVHGm6k4yR8Vv42WMa24uRA5k6SvOD0gXulzQZus7zXTJMUVnAKXeGo7NpAAIjQib3BGY6HWDsIlPwIa3M2ZaWkE62I MSrLvmNMG7ZjMDoeq21HAaXTm8/pTLCWft1HB8SKlFhGwykciLFTlX8Bo5aDBzGb33 qnrtx9R5eySZXj09REVlBERAREQEREBERAREQEREBERAVZ2h4YMRQfT31aeThcfp5FWa8UWcxMtl5jguDYOrSZUp1GZblzbROaQ6B5gn16hVmH1HX6aru 0bgKYdydr6FcM18ExqDmaubdOJI7dGfNtRMfWa8hj8skTlJHpqtnDeG0WkvDsrjrB15zzWeMp06wBLQSDIkLfw7ChvsU2 4LPGx1 /aQHtNhLgdQB qnYPBkuawHXQnb9wVrZbXXdW3ZuiXPLzo0QPM/2 aYzyykZbc/HGuiY2AByWSIu55YiIgIiICIiAiIgIiICIiAiIgIiICIoON4hTY5tIvAqVAcjdzGp6Dqg5/tTx2kWuw4Ds5GbQAQNbzuJHquGp4wggG/J3Pz6ru KYJrv4gbLmgtNtWm5/fUrmsbwKJfTBcw 0zdvVvMdNRG 0btVuPli1 Puxl8cukKhiBOsK6wlcNGy55 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    "thumbnail" : false
}

Есть какие-нибудь предложения?

Ответ №1:

Возможно, проблема с форматом данных. Этот работает:

 db.images.insertOne({
   "_class": "com.test.images.model.ImageEntity",
   "practiceId": NumberLong(242),
   "fileName": "img.jpg",
   "contentType": "image/jpeg",
   "thumbnail": false,
   data: BinData(0, "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 /i8UyZJHXXn7lDe9zjlFOTzMlZ3Jrjhz6WNLiFR7iS4Hq9x WZTBxFtNwOhB2cSD6mY8tPgoVPhVVwAawNG8mPcBorXC9nrS8/5WN24xvj8fK/h0vZ/7QKfsVZtuTJHruPjzXc4TF06rc1NwcOYXxPF9nHgksI9LLoewfFXMf3TgQZ066e/4LTDZKy2abj7fU0WLTIWS2YCIiAiIgIiICIiAiIgIiICIiAiIgLgPtJYX1KbPuimXeuYAfvou/XJds8MCc3OnlHvn9 aipnt8yNIlvdxADpHMg/sKxwGGAiBCVmeMxoP8LdRqMbAe4BcW3m16ejxkW F0hS6bFWYDjeFLsodJV931MAui0rLw 2/ T6QarVUjC5cQyqBv4h5f2Ut3HWPJa2k8xqRp7zC9w Ka59MibuLSDsYJHy K01yzJjvymWF 30ukBAjRZrRgv5bJ/CFvXe8oREQEREBERAREQEREBERAREQEREHi5ntriWtFNn335i0dBE/Me9dOvn/ANqtOo0UazdKbXx0dLHD4NcfRVzvE5aasZllxXPYOTTe8jxd44HpEED4qBU4Y9z5zZRF3QJnbXb9 XTcBoCpw9tWQX1JqujSdHRyjL6LDCsBsVzbOZeY7dMl5l/Cqq8OHcBpOarlu8WB5EDYzyMHkLET HVHGm6k4yR8Vv42WMa24uRA5k6SvOD0gXulzQZus7zXTJMUVnAKXeGo7NpAAIjQib3BGY6HWDsIlPwIa3M2ZaWkE62I MSrLvmNMG7ZjMDoeq21HAaXTm8/pTLCWft1HB8SKlFhGwykciLFTlX8Bo5aDBzGb33 qnrtx9R5eySZXj09REVlBERAREQEREBERAREQEREBERAVZ2h4YMRQfT31aeThcfp5FWa8UWcxMtl5jguDYOrSZUp1GZblzbROaQ6B5gn16hVmH1HX6aru 0bgKYdydr6FcM18ExqDmaubdOJI7dGfNtRMfWa8hj8skTlJHpqtnDeG0WkvDsrjrB15zzWeMp06wBLQSDIkLfw7ChvsU2 4LPGx1 /aQHtNhLgdQB qnYPBkuawHXQnb9wVrZbXXdW3ZuiXPLzo0QPM/2 aYzyykZbc/HGuiY2AByWSIu55YiIgIiICIiAiIgIiICIiAiIgIiICIoON4hTY5tIvAqVAcjdzGp6Dqg5/tTx2kWuw4Ds5GbQAQNbzuJHquGp4wggG/J3Pz6ru KYJrv4gbLmgtNtWm5/fUrmsbwKJfTBcw 0zdvVvMdNRG 0btVuPli1 Puxl8cukKhiBOsK6wlcNGy55 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})

db.images.aggregate([
   {
      $project: {
         "practiceId": "$practiceId",
         "imageSize": { $binarySize: "$data" }
      }
   }
])

{ 
    "practiceId" : 242, 
    "imageSize" : 4207.0
}

Я вставляю эти два документа:

 db.images.insertMany([
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      author: "you",
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         "$type": "00"
      },
   },
   {
      author: "me",
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   }
])

Монгоэкспорт выглядит так:

 {
    "_id": { "$oid": "60f92b42607c82337782654e" },
    "author": "you",
    "data": {
        "$binary": "/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAAk...",
        "$type": "00"
    }
},
{
    "_id": { "$oid": "60f92b42607c82337782654f" },
    "author": "me",
    "data": {
        "$binary": {
            "base64": "/9j/4AAQSkZJRgABAQAAAQABAAD/2wCEAA...",
            "subType": "00"
        }
    }
}

Похоже, монго не распознает его как двоичные данные, вывод другой.

Комментарии:

1. Я думаю, что моя версия mongo старая 3.2.5, поэтому $binarySize не поддерживает

2. С новой версией он дает мне правильный вывод, но размер изображения на выходе указан в байтах. Есть ли какой-нибудь способ, которым мы можем получить его в КБ

3. Ах да, я не обратил внимания на ваше сообщение об ошибке. Это число так просто imageSize: { $divide: [{ $binarySize: "$data" }, 1024] }

4. Спасибо за вашу помощь! но есть ли какой-нибудь способ получить размер изображения для более старой версии mongo?

5. Я так не думаю, вам нужна более свежая версия.

Метки: ,