访问MongoDB和Python中的嵌套条目

import pymongo

# 连接MongoDB数据库
client = pymongo.MongoClient("mongodb://localhost:27017/")
db = client["mydatabase"]
collection = db["mycollection"]

# 查询嵌套条目
query = {"nested_field.key": "value"}
result = collection.find(query)

# 遍历查询结果
for doc in result:
    nested_item = doc["nested_field"]
    print(nested_item)

# 插入嵌套条目
new_item = {
    "key": "value",
    "nested_field": {
        "key1": "value1",
        "key2": "value2"
    }
}
collection.insert_one(new_item)

# 更新嵌套条目
query = {"key": "value"}
update = {"$set": {"nested_field.key1": "new_value"}}
collection.update_one(query, update)

# 删除嵌套条目
query = {"key": "value"}
collection.delete_one(query)