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使用PyMongo执行正则表达式查询？

2024-05-15 15:23:05 373

PyMongo是一个Python发行版，其中包含用于MongoDB的工具。要使用PyMongo执行正则表达式查询，语法如下-

db.yourCollectionName.find({'yourCollectionName':{'$regex':'^yourWords'}}).pretty();

上面的语法将提供所有从特定单词开始的文档。

为了理解语法，让我们用文档创建一个集合。使用文档创建集合的查询如下-

> db.performRegex.insertOne({"ClientName":"Larry","ClientFolderInformation":[
   "Folder 1","Folder 2","Folder 3","Folder 4","Folder 5"], "MainFolderLocation":"/MainFolder/Details/ClientFolder" });
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5c8a8b186cea1f28b7aa07f2")
}
> db.performRegex.insertOne({"ClientName":"Larry","ClientFolderInformation":[
   "ClientFolder 1","ClientFolder 2","ClientFolder 3","ClientFolder 4","ClientFolder 5"],
   "MainFolderLocation":"/MainFolder/Details/ClientFolder" });
{
   "acknowledged" : true,
   "insertedId" : ObjectId("5c8a8b1d6cea1f28b7aa07f3")
}

在find()method的帮助下显示集合中的所有文档。查询如下-

> db.performRegex.find().pretty();

以下是输出-

{
   "_id" : ObjectId("5c8a8b186cea1f28b7aa07f2"),
   "ClientName" : "Larry",
   "ClientFolderInformation" : [
      "Folder 1",
      "Folder 2",
      "Folder 3",
      "Folder 4",
      "Folder 5"
   ],
   "MainFolderLocation" : "/MainFolder/Details/ClientFolder"
}
{
   "_id" : ObjectId("5c8a8b1d6cea1f28b7aa07f3"),
   "ClientName" : "Larry",
   "ClientFolderInformation" : [
      "ClientFolder 1",
      "ClientFolder 2",
      "ClientFolder 3",
      "ClientFolder 4",
      "ClientFolder 5"
   ],
   "MainFolderLocation" : "/MainFolder/Details/ClientFolder"
}

这是执行正则表达式的查询。

情况1-以下查询给出了所有以'ClientFolder'开头的文档-

> db.performRegex.find({'ClientFolderInformation':{'$regex':'^ClientFolder'}}).pretty();

以下是输出-

{
   "_id" : ObjectId("5c8a8b1d6cea1f28b7aa07f3"),
   "ClientName" : "Larry",
   "ClientFolderInformation" : [
      "ClientFolder 1",
      "ClientFolder 2",
      "ClientFolder 3",
      "ClientFolder 4",
      "ClientFolder 5"
   ],
   "MainFolderLocation" : "/MainFolder/Details/ClientFolder"
}

情况2-以下查询提供了所有以“文件夹”开头的文档-

> db.performRegex.find({'ClientFolderInformation':{'$regex':'^Folder'}}).pretty();

以下是输出-

{
   "_id" : ObjectId("5c8a8b186cea1f28b7aa07f2"),
   "ClientName" : "Larry",
   "ClientFolderInformation" : [
      "Folder 1",
      "Folder 2",
      "Folder 3",
      "Folder 4",
      "Folder 5"
   ],
   "MainFolderLocation" : "/MainFolder/Details/ClientFolder"
}

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使用PyMongo执行正则表达式查询？

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