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From publicay...@verizon.net
Subject Re: procedure to upgrade or create an embedded database
Date Mon, 08 Dec 2008 23:09:10 GMT
How do I tell if the database needs to be upgraded? Or is there no 
impact if I specify "upgrade" but one is not necessary?

Brian


On Mon, Dec 8, 2008 at  8:43 AM, Rick Hillegas wrote:

> Brian Peterson wrote:
>> I'm trying to figure out how to determine what connection parameters 
>> for an
>> embedded database I should use when there might not be a database in 
>> place
>> (so "create=true"), or there might be an older version already in 
>> place (so
>> "upgrade=true"), or there might already be a database of the right 
>> version
>> in place (so "create" or add nothing to the URL).
>>
>> I read that "upgrade" and "create" cannot both be specified in the
>> connection URL. If I'm putting out a release of my application that 
>> uses the
>> latest version of Derby (10.4) while a previous version used 10.2.2, 
>> what
>> are the recommended steps for making the connection to the Derby 
>> database if
>> one is already present? (Note that I have to handle this 
>> programmatically as
>> part of the application startup.)
>>
>> Do I first try a URL with "create" and see if there's an error, and 
>> if so,
>> follow up with a call with "upgrade"? Or do I have the procedure 
>> always use
>> "upgrade" and follow up with a URL with "create" if it fail to make a
>>
> Hi Brian,
>
> Your first approach sounds good to me:
>
> 1) Bring up the database, specifying "create=true"
>
> 2) If you get the warning that the database already exists, then bring 
> down the database and reboot it in upgrade mode
>
> Regards,
> -Rick
>> connection?
>>
>> Brian
>>
>>
>>
>>

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