一层数据流图

本源码是针对中小型超市而开发的超市管理系统，使用方便-against the source is the development of small and medium-sized supermarkets and supermarket management system, easy to use

说明：  The front-end and back-end are completed by themselves. The front-end uses some basic frameworks (after all, I mainly focus on the development direction of the back-end). Most of the functions used in the back-end are implemented and encapsulated by themselves from the bottom, and almost no third-party frameworks are used. Generally speaking, it is relatively simple, and there may be defects or loopholes in some places.

数据库连接核对数据库的各种操作，包括第三方类，和数据库的连接方法，各种操作，看过之后有助于你对数据库的认识

说明：  提供最好的数据库程序代码尽快恢复快结束的快捷回复客户付款发货客服很快付款一就地覅(Provide the best database program codeThe end of the fast recovery fast reply customer payment delivery service soon payment in Fiao as soon as possible)

数据库的一些操作的，如添加、删除、修改、更新等 (Some database operations, such as add, delete, modify, update, etc.)

类，用于执行管理任务的 MS SQL Server 数据库。例如，备份、 还原、 收缩。

数据库C/S模式连接（以T-SQL数据库为例，vs2010环境）(Database C/S mode connection (T- SQL , for example, vs2010 environment))

数据库实验报告，老师布置的作业，也就是课本上的题自己用SQL语言进行调试，编写。-experimental database report, the teacher layout of the operation, which is on the books and that their use SQL debugging and preparation.

示例：备份SQL数据库和还原SQL数据库-Example: Backup and restore SQL database, SQL database,

SQL使用技术说明的书，很好用，第二版 -SQL using the technical description of the book, very good, and the second edition of