Now, enterprises or organizations have to spend more
energy to deal with this challenge that the relational data to
be stored has beyond storage limit of a single database server.
Even worse is that traditional relational databases are almost
difficult to extend. It is generally accepted that the ideal
solution is to distribute data to multiple servers. According to
this idea, we design the system as database middleware to
achieve data partion. The programmer just need to focus on
the business logic without understanding the underlying data
distribution and structure by using this system and the extra
work is merely to configure several fiels