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Alberto Siurob
Asked: 2020-07-07 14:17:22 +0800 CST 2020-07-07 14:17:22 +0800 CST

从 Python 查询 MongoDB

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我正在尝试从 Python 查询 MongoDB，我刚刚进入这些技术。

我有这个代码

import pymongo
from pymongo import MongoClient

client = MongoClient()
db = client.crawler.users
res = db.find()

print( res )

它向我抛出了这个消息：

<pymongo.cursor.Cursor object at 0x7f438d574cd0>
Process exited with code: 0

如果您运行它，我希望从 Mongo 控制台得到这样的响应：

> db.users.find()
{ "_id" : ObjectId("5b3fd50706dd45b669417454"), "NAME" : "FOO", "LAST_NAME" : "BAR" }
{ "_id" : ObjectId("5b3fdd2e613d0b159da70742"), "NAME" : "POO", "LAST_NAME" : "MAR" }

感谢您的耐心等待

python

1 Answers

  1. Best Answer

    发生的事情是您正在打印光标。根据文档，该方法find返回一个pymongo.cursor.Cursor. 为了能够打印文档，您必须迭代光标：

    import pymongo
from pymongo import MongoClient

client = MongoClient()
db = client.crawler.users
res = db.find()
for document in res:
    print(document)

    这样，您应该会看到集合中每个文档的内容。如果您使用它看起来会更好pprint：

    import pymongo
from pymongo import MongoClient
from pprint import pprint

client = MongoClient()
db = client.crawler.users
res = db.find()
for document in res:
    pprint(document)
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