本文从B树开始谈起，然后论述B+树、B*树，最后谈到R 树。其中B树、B+树及B*树部分由weedge完成，R 树部分由Frankie完成，全文最终由July统稿修订完成。-Starting the beginning of this B-tree, and then discusses the B+ tree, B* tree, R-tree and finally spoke. Where the B-tree, B+ tree and B* tree partially complete