# Lee
# July 29, 2018
from abc import ABC, abstractmethod

class DBHandler(ABC):
    @abstractmethod
    def insert_items(self):
        pass
        
    @abstractmethod
    def find_items(self):
        pass
        
    @abstractmethod
    def find_item(self):
        pass
   
    @abstractmethod
    def delete_items(self):
        pass
      
    @abstractmethod
    def update_items(self):
        pass
    
    @abstractmethod
    def aggregate(self): 
        pass
