pymongo：檢查是否我們已連接到的MongoDB數據庫

Question

client = MongoClient('localhost',27017) 
db = client[DB_NAME] 

def db_connect(): 
    #connecting to a DB in mongoDB 
    try: 
     if client.get_database(DB_NAME): 
      print("Connection Successful!") 
      return True 
    except: 
     print("Please check your connection") 
     return False 

def db_close(): 
    print ("Connection Getting Closed") 
    client.close() 

我想實現一個任務，只有通過pymongo存在的連接，然後返回true，這樣的功能可以繼續，否則應該返回false和消息來檢查連接。所以我們不會繼續下去。

我該如何做到這一點？

EDIT 1：接受的解決方案

Successfully added user: { 
"user" : "ash", 
"roles" : [ 
    { 
     "role" : "readWrite", 
     "db" : "myDB" 
    }, 
    "clusterAdmin" 
] 

}

我添加使用上述代碼段用戶，然後用於下面的腳本。

DB_NAME = "myDB" 
client = MongoClient('localhost',27017) 
db = client[DB_NAME] 
def db_connect(): 
    #connecting to a DB in mongoDB 
    try: 
     if db.authenticate("ash","password"): 
      print("Connection Successful!") 
      return True 
    except: 
     print("Please check your connection") 
     return False 

def db_close(): 
    print ("Connection Getting Closed") 
    client.close() 

if __name__ == "__main__": 
    db_connect() 
    db_close() 

我已經使用這個代碼段連接到我的DB 現在越來越連接到數據庫 我在我的電腦數據庫中，我使用的Ubuntu 16.04。

Answer 1

你可能會無論如何都要使用authenticate方法連接功能裏面，這樣你就可以做到這一點如下：

In [12]: client = MongoClient(DB_MACHINE, DB_PORT) 
In [13]: db = client.db_name 
In [16]: if db.authenticate(DB_USER, DB_PASS, source=DB_SOURCE): 
      # authenticated, do ... 
     else: 
      # not authenticated, not connected, do something else