商场端登录模块的业务逻辑层主要实现对其数据的加工处理，其实现主要针对用户所能操作的模块功能，以及商场端登录模块数据访问层主要实现SQL语句的拼凑，然后将SQL语句传入系统共用数据访问类中-Mall business logic side login module mainly realizes its data processing, mainly for its implementation user can operate the module functions, as well as s