应用程序保存的Pymongo数据在mongo shell中不可用

Question

我正在用Pymongo构建一个烧瓶应用程序。在我的python脚本中，数据应该用。save（）保存，也可以用。find（）检索，如果我重新启动应用程序，它也会保持不变。然而，如果我从另一个终端或在停止应用程序后从同一终端检查mongo数据库，数据就不在那里了。为了确保正确使用pymongo，我从w3schools.com复制并粘贴了下面的基本脚本：

#!/usr/bin/python3
import pymongo

myclient = pymongo.MongoClient("mongodb://localhost:27017/")
mydb = myclient["mydatabase"]
mycol = mydb["customers"]
mydict = { "name": "John", "address": "Highway 37" }
obj = mycol.insert_one(mydict)
obj = mycol.find_one()
print(obj)

输出为：

{'_id': ObjectId('5f09b0c4dfedb570e2f5411e'), 'name': 'John', 'address': 'Highway 37'}

正如你所料。这是在运行上述脚本之前显示数据库的结果：

> show databases
admin   0.000GB
config  0.000GB
local   0.000GB

> show databases
admin   0.000GB
config  0.000GB
local   0.000GB
mydatabase  0.000GB

use mydatabase
db.mydatabase.customers.find()
>

storage:
  dbPath: /var/lib/mongodb
  journal:
   enabled: true


systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log

net:
  port: 27017
  bindIp: 127.0.0.1

processManagement:
  timeZoneInfo: /usr/share/zoneinfo

MongoDB shell version v4.2.8
connecting to: mongodb://127.0.0.1:27017/?compressors=disabled&gssapiServiceName=mongodb
Implicit session: session { "id" : UUID("20a57a18-201c-4393-a9a3-c0ee53e028e8") }
MongoDB server version: 4.2.8
Server has startup warnings: 
2020-07-11T12:16:02.034+0000 I  STORAGE  [initandlisten] 
2020-07-11T12:16:02.034+0000 I  STORAGE  [initandlisten] ** WARNING: Using the XFS filesystem is strongly recommended with the WiredTiger storage engine
2020-07-11T12:16:02.034+0000 I  STORAGE  [initandlisten] **          See http://dochub.mongodb.org/core/prodnotes-filesystem
2020-07-11T12:16:02.940+0000 I  CONTROL  [initandlisten] 
2020-07-11T12:16:02.940+0000 I  CONTROL  [initandlisten] ** WARNING: Access control is not enabled for the database.
2020-07-11T12:16:02.940+0000 I  CONTROL  [initandlisten] **          Read and write access to data and configuration is unrestricted.
2020-07-11T12:16:02.940+0000 I  CONTROL  [initandlisten]

看到“连接到:mongoDb://127.0.0.1:27017/？compressors=disabled&gssapiserviceName=mongoDb”后，我试图将MongoClient连接改为“mongoDb://127.0.0.1:27017/？compressors=disabled&gssapiserviceName=mongoDb”，看看这是否可行，但它只是抛出并出错：

    /home/vagrant/.local/lib/python3.6/site-packages/pymongo/compression_support.py:55: UserWarning: Unsupported compressor: disabled
  warnings.warn("Unsupported compressor: %s" % (compressor,))
/home/vagrant/.local/lib/python3.6/site-packages/pymongo/common.py:756: UserWarning: Unknown option gssapiservicename
  warnings.warn(str(exc))

Answer 1

您需要的语法是：

db.customers.find()

在贝壳上。您已经使用use命令指定了数据库。

要列出集合，它是：

show collections