Question

我在OS X 10.9上運行mariadb數據庫並嘗試通過python連接到它。

如果我試試這個代碼，它工作得很好

import mysql.connector as mariadb 

if __name__ == "__main__": 

    mariadb_connection = mariadb.connect(user='root', database='account_balances') 
    cursor = mariadb_connection.cursor() 

我可以將事件插入一些記錄

但如果我嘗試

class account(object): 
    _logging_to_db_enabled = False 
    _database_object = None 
    _database_cursor = None 

def __init__(self): 
    pass 

def enable_logging_to_db(self): 
    try: 
     self._database_object = mariadb.connect(mariadb.connect(user='root', database='account_balances')) 
     self._logging_to_db_enabled = True 
    except self._database_object.Error as error: 
     print ("Opening DB error: {}".format(error)) 

    self._database_cursor = self._database_object.cursor() 

if __name__ == "__main__": 

    testobject = account() 
    testobject.enable_logging_to_db() 

我得到這個錯誤以下

File "....", line 22, in enable_logging_to_db 
self._database_cursor = self._database_object.cursor() 
File "<pathname_deleted>", line 1372, in cursor 
raise errors.OperationalError("MySQL Connection not available.") 
mysql.connector.errors.OperationalError: MySQL Connection not available. 

An一個想法爲什麼這是主要工作，但不是在一個對象內？

Answer 1

因爲你有一個錯字/複製&粘貼錯誤：

self._database_object = mariadb.connect(mariadb.connect(user='root', database='account_balances')) 

它應該是：

self._database_object = mariadb.connect(user='root', database='account_balances')