工厂模式三层架构增删改查分页（BLL层使用事务）源码
本软件是一个工厂模式三层架构例子程序（★特点与难点是在BLL层使用数据库事务，而不在DAL层使用数据库事务）。程序通过WinForm应用程序实现Sql Server 2005,Sqlite 3的增、删、改、查，分页功能。是学习三层架构、工厂模式，操作Sql Server和Sqlite数据库的极佳学习例子。本源码是我开发一个10万行代码软件时使用的架构的进化升级版，使用此架构，可以开发复杂的（操作数据库）WinForm或WebForm程序，相信您在学习这个例子程序的时候，能学到很多项目开发经验，包括接口操作、文件组织、编码规范、多数据库、代码重用等等。
【为什么要在BLL层使用数据库事务？】
1．由于某些业务逻辑较复杂，需要对数据库多表进行操作，为保证关联数据的完整性，需要使用数据库事务。
2．为了实现应用系统（业务逻辑）一次编写即可支持多种数据库，需要使用工厂模式实现多数据库支持。
3．一般情况，我们可以在DAL层使用数据库事务，但较多的业务逻辑放在DAL层，使得BLL层和DAL层职责不清，不利于统一在BLL层编写业务逻辑
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