使用Pymongo获取集合的所有文档

Question

I want to write a function to return all the documents contained in mycollection in mongodb

from pymongo import MongoClient

if __name__ == '__main__':
    client = MongoClient("localhost", 27017, maxPoolSize=50)
    db=client.mydatabase
    collection=db['mycollection']
    cursor = collection.find({})
    for document in cursor:
        print(document)

However, the function returns: Process finished with exit code 0

Answer 1

Here is the sample code which works fine when you run from command prompt.

from pymongo import MongoClient

if __name__ == '__main__':
    client = MongoClient("localhost", 27017, maxPoolSize=50)
    db = client.localhost
    collection = db['chain']
    cursor = collection.find({})
    for document in cursor:
          print(document)

Please check the collection name.

Answer 2

I think this will work fine in your program.

cursor = db.mycollection # choosing the collection you need

for document in cursor.find():
    print (document)

Answer 3

pymongo creates a cursor. Hence you'll get the object 'under' the cursor. To get all objects in general try:

list(db.collection.find({}))

This will force the cursor to iterate over each object and put it in a list()

Have fun...