Hi, thanks for the answer and the link.
I have one more question: connecting to a derby database how can i know its version? Thanks On 13 June 2011 22:28, Kathey Marsden <[email protected]> wrote: > On 6/13/2011 1:13 PM, rob wrote: >> >> Hi, >> >> sorry for the question, i am new to derby, i have some databases >> created with derby 10.7, i would like to update to 10.8, my doubt is : >> can i always open a database created with 10.7 with the 10.8 >> derby.jar? >> >> > From my tests seems ok, but just to be sure if someone more expert >> than me can confirm this. >> >> I see, and this is ok, that the opposite is not possible, i cannot >> open a database created with 10.8 with 10.7 because the format is >> different. >> >> So there is some automatic format's conversion when you open a 10.7 >> database with 10.8? >> > Hi Rob, > > When you connect to your 10.7 database with a newer version e.g. connect > 'jdbc:derby:mydb' you are in what is called soft upgrade mode. You can > still run your existing application and go back to 10.7 but may not be able > to use some new features. > > If you connect with the upgrade=true attributed, e.g. > 'jdbc:Derby:mydb;upgrade=true' , this is called hard upgrade. The database > format will be changed to the newer version, any usage restrictions will be > lifted and you will not be able to go back to 10.7. > > see: > http://wiki.apache.org/db-derby/UpgradingTen > > I am not sure if any of the 10.8 features specifically require hard upgrade, > but generally I encourage users to perform hard upgrade once they have > verified their application with the new version. Moving forward it is the > most recent version that will get the most rigorous upgrade testing. > > Kathey > > >
