R树与B树的混合树，在这个程序里面可以直接用R树和B树-R and B-tree tree of mixed tree, in the inside can directly with the R and B-tree tree

小型数据库系统，Visual Studio 2008/2010工程，可直接运行，支持SQL语句、建立B+树索引、计算操作时间等功能-Small database system, Visual Studio 2008/2010 project can be run directly support the SQL statement to establish B+ tree index, calculated operation time etc.