网上找到的些许程序与数据库连接程序，针对各种不同数据库给出源代码-Online to find a little program and the database connection program, a variety of different databases for the source code is given

ID3算法的实现，能有效地将数据库中潜在的知识进行分类。-ID3 algorithm, to be effective in a database of potential knowledge classification.