SQL Server Section
1.http://blog.csdn.net/zhyl8157121/article/details/8169172
2.http://blog.sina.com.cn/s/blog_4ba5666e010178gx.html
JDBC Driver for SQL Server
(1) http://jtds.sourceforge.net/index.html (recommended, open source)
Http://blog.chinaunix.net/uid-327166-id-3962367.html
(2) http://www.microsoft.com/zh-CN/download/details.aspx?id=11774 (official)
Http://www.singlex.net/2379.html
MySQL section
Direct connection (poor security)
1.http://blog.csdn.net/luzhenrong45/article/details/8933515
2.http://blog.csdn.net/henglei1/article/details/12110211
Php,json
1.http://blog.csdn.net/welovesunflower/article/details/7776438
2.http://qinya.iteye.com/blog/1484073
3.http://blog.sina.com.cn/s/blog_6923201d01011t6h.html
4.http://wenku.baidu.com/view/b41539d226fff705cc170a3f.html
5.http://bbs.myolnet.com/forum.php?mod=viewthread&tid=39747
6.http://blog.csdn.net/chiuan/article/details/6992579
Android Access database (SQL Server and MySQL)