采用JTree根据数据库表建立树形结构。需要用mysql创建一个area(id,name)。id的结构是x.xxx.xxx.xxx结构，层次可自己设定。-Established according to a database table using JTree tree. Need to use mysql to create a area (id, name). id structure is x.xxx.xxx.xxx structure, hierarchy can set yoursel

MiniSQL Search for certain tuple Search between a range Create table Create B+index based on the key Drop table Drop index -A simple database. Simple operations are supported like search for certain tuple and create a new table. B+tree