抽象工厂(Abstract Factory)

模式定义

提供一个接口， 让该接口负责创建一系列‘相关或者相互依赖的对象’ ， 无需指定他们具体的类

要点总结

如果没有应对‘多系列对象构建’的需求变化 ，则没有必要使用Abstract Factory模式，这个时候使用简单的工厂完全可以

‘系列对象’值的事在某一特定系列下的队形之间有相互依赖，或者作用的关系。不同系列的对象之间不能相互依赖。

Abstract Factory 模式主要在于应对‘新系列’的需求变动。其缺点在于难以应对‘新对象’的需求变动

"""
设计模式——抽象工厂模式
抽象工厂模式(Abstract Factory Pattern):提供一个创建一系列相关或相互依赖对象的接口，而无需指定它们的类
"""
import sys

#抽象用户表类
class User(object):

    def get_user(self):
        pass

    def insert_user(self):
        pass

#抽象部门表类
class Department(object):

    def get_department(self):
        pass

    def insert_department(self):
        pass

#操作具体User数据库类-Mysql
class MysqlUser(User):

    def get_user(self):
        print 'MysqlUser get User'

    def insert_user(self):
        print 'MysqlUser insert User'

#操作具体Department数据库类-Mysql
class MysqlDepartment(Department):

    def get_department(self):
        print 'MysqlDepartment get department'

    def insert_department(self):
        print 'MysqlDepartment insert department'

#操作具体User数据库-Orcal
class OrcaleUser(User):

    def get_user(self):
        print 'OrcalUser get User'

    def insert_user(self):
        print 'OrcalUser insert User'

#操作具体Department数据库类-Orcal
class OrcaleDepartment(Department):

    def get_department(self):
        print 'OrcalDepartment get department'

    def insert_department(self):
        print 'OrcalDepartment insert department'

#抽象工厂类
class AbstractFactory(object):

    def create_user(self):
        pass

    def create_department(self):
        pass

class MysqlFactory(AbstractFactory):

    def create_user(self):
        return MysqlUser()

    def create_department(self):
        return MysqlDepartment()

class OrcaleFactory(AbstractFactory):

    def create_user(self):
        return OrcalUser()

    def create_department(self):
        return OrcalDepartment()

if __name__ == "__main__":

    db = sys.argv[1]
    myfactory = ''
    if db == 'Mysql':
        myfactory = MysqlFactory()
    elif db == 'Orcal':
        myfactory = OrcaleFactory()
    else:
        print "不支持的数据库类型"
        exit(0)
    user = myfactory.create_user()
    department = myfactory.create_department()
    user.insert_user()
    user.get_user()
    department.insert_department()
    department.get_department()