In the JDBC world if you want to change your datamodel frequently you should 
write some SQL scripts that recreate the database from scratch and accept 
inputs that abstract the new tables or fields to setup.  If you want more 
details let me know as I've done this many times.

Sent from my iPhone

On Aug 7, 2010, at 7:35 PM, Young <woshidus...@126.com> wrote:

> So if I want to change my datamodel frequently, I have to use JDBC model?
> 
> 
> 
> 
> At 2010-08-07 20:44:20,"Sean Owen" <sro...@gmail.com> wrote:
> 
>> No, you just update the database tables. That's the point of using the
>> JDBC model.
>> 
>> 2010/8/7 Young <woshidus...@126.com>:
>>> If I want to update the datamodel frequently or in real time, what should I 
>>> do? Or I have to use two instance and fit the database data into memory 
>>> alternatively?
>>> 

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