/* * To change this template, choose Tools | Templates * and open the template in the editor. */package com.shopping.dao;import com.shopping.model.Category;import java.util.List;/** * * @author ruirui * CategoryDAO?ж??????????? * CategoryMysqlDAO * CategoryOracleDAO;; * CategoryFactory; */public interface CategoryDAO {            public int save(Category c);    public void del(Category c);    public List<Category> getCategorys();    public  void addChildCategory(int pid, String cname, String cdescr,int grade);    public void delete(int id,int pid);    public Category loadById(int id);}