mongodb-如何将内容更新为许多集合

Question

我有一个称为“图像”的集合，下面是图像集合的1个文档：

{
    "_id" : ObjectId("6234342df8afb4001e279ecc"),
    "is_deleted" : false,
    "labels" : [ 
        {
            "_id" : ObjectId("623d687e745109001e09f146"),
            "labelId" : ObjectId("623d6821745109001e09f04e"),
            "xmin" : 0.400763358778626,
            "xmax" : 0.614503816793893,
            "ymin" : 0.694300518134715,
            "ymax" : 0.906735751295337
        }
    ],
    "img_name" : "6910486605301182464.jpg",
    "img_originalname" : "images (11).jpg",
    "img_desc" : "Cyber Sercurity multi upload",
    "img_uri" : "http://localhost:8080/resources/images/2022/3/18/6910486605301182464.jpg",
    "img_path" : "/resources/images/2022/3/18/6910486605301182464.jpg",
    "datasetId" : ObjectId("6234342df8afb4001e279eca"),
    "createdAt" : ISODate("2022-03-18T07:26:37.422Z"),
    "updatedAt" : ISODate("2022-03-25T07:00:14.074Z"),
    "__v" : 0
}

在本文档中，我有一个 img_uri 其值当前以“ http：// localhost：8080”开头的。但是现在，我想找到所有文档的 img_uri 的值是“ http：// localhost：8080”，以替换我的域 img_uri =“ https://example.com” /code>，因此上述文档看起来像这样：

{
    "_id" : ObjectId("6234342df8afb4001e279ecc"),
    "is_deleted" : false,
    "labels" : [ 
        {
            "_id" : ObjectId("623d687e745109001e09f146"),
            "labelId" : ObjectId("623d6821745109001e09f04e"),
            "xmin" : 0.400763358778626,
            "xmax" : 0.614503816793893,
            "ymin" : 0.694300518134715,
            "ymax" : 0.906735751295337
        }
    ],
    "img_name" : "6910486605301182464.jpg",
    "img_originalname" : "images (11).jpg",
    "img_desc" : "Cyber Sercurity multi upload",
    "img_uri" : "https://example.com/resources/images/2022/3/18/6910486605301182464.jpg",
    "img_path" : "/resources/images/2022/3/18/6910486605301182464.jpg",
    "datasetId" : ObjectId("6234342df8afb4001e279eca"),
    "createdAt" : ISODate("2022-03-18T07:26:37.422Z"),
    "updatedAt" : ISODate("2022-03-25T07:00:14.074Z"),
    "__v" : 0
}

Answer 1

过滤器 - 带有 img_uri 的文档以“ http：// localhost：8080”开头，通过 $ REGEX 。

使用聚合管道来处理更新，通过 img_uri 。 mongodb.com/docs/manual/reference/operator/aggregation/replaceone/“ rel =“ nofollow noreferrer”> $ replace> $替换 。

使用 {multi：true} 更新所有过滤文档。

db.collection.update({
  "img_uri": {
    $regex: "^http://localhost:8080"
  }
},
[
  {
    $set: {
      "img_uri": {
        $replaceOne: {
          input: "$img_uri",
          find: "http://localhost:8080",
          replacement: "https://example.com"
        }
      }
    }
  }
],
{
  multi: true
})

示例mongo playground

Answer 2

Yong Shun提供的解决方案适用于MongoDB版本4.4及更高版本，如果您使用的版本较小，请尝试以下操作：

db.collection.update({
  "img_uri": {
    $regex: "^http://localhost:8080"
  }
},
[
  {
    $set: {
      "img_uri": {
        $concat: [
          "https://example.com",
          {
            $substrBytes: [
              "$img_uri",
              {
                $strLenBytes: "http://localhost:8080"
              },
              {
                $strLenBytes: "$img_uri"
              }
            ]
          }
        ]
      }
    }
  }
],
{
  multi: true
})

这是操场链接。