Make your own free website on Tripod.com

InstantDB Project
About InstantDB
Project Mail Lists
Short History
Reporting Bugs
Screen Shots
3rd Party Examples
FAQs

Software
Downloads
Documentation
CVS Repositories
Roadmap
License

About Enhydra.org
Who We Are
News, Articles & Events
Getting Involved
Contact Us

Community
Demos
Contributions
Resources
Case Studies
On The Edge! -NEW-
Commercial Vendors


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: InstantDB: database shutting itself down without error


Thank you for your response, though.  We have been having a hard time with
trying to find the cause of InstantDB randomly shutting itself down after
executing a query and returning the result set.

Right now, we have a connection manager class that has a static member
variable for the connection.  Our application driver starts up the database
and the connection variable gets set at that point.  We have database helper
classes that are instantiated as needed.  These classes get the connection
from the connection manager and use it as necessary. 

It is not that we need threads to operate within the same transaction.  It
is more that we have separate threads that will be creating instances of the
database helper classes which will be accessing the static connection
variable.  But, so far in our testing we haven't had more than one thread
try to access the database connection at a time.

Thanks for your help.

Marci Lehman

-----Original Message-----
From: Scott Plante [mailto:splante@insightsys.com]
Sent: Thursday, March 01, 2001 5:47 PM
To: instantDB@enhydra.org
Subject: Re: InstantDB: database shutting itself down without error


Hmmm, I stand corrected. That's what I get for not double-checking 
before I post :-( I could have sworn I learned that somewhere.

So why would you want to share a connection between threads? Do you need 
the threads to operate within the same transaction?

Scott

Peter Yuill wrote:

>> You should never have multiple threads accessing the same connection 
>> unless you're using some pooling mechanism that insures that two threads 
>> can't using a connection at the same time. This is true for any JDBC 
>> connection, not just InstantDB.
> 
> 
> Not so according to the spec. Section 9.2 says:
> "We require that all operations on all the java.sql objects be
multi-thread safe and able to 
> cope correctly with having several threads simultaneously calling the same
object"
> 
> If multi-threading is the problem (only speculation at this point) then
its a bug.
> 
> Regards,
> Peter Yuill
> 
>
----------------------------------------------------------------------------
-
> To unsubscribe from this mailing list, send email to majordomo@enhydra.org
> with the text "unsubscribe instantdb" in the body of the email.
> If you have other questions regarding this mailing list, send email to
> the list admin at owner-instantdb@enhydra.org.
> 
> 

----------------------------------------------------------------------------
-
To unsubscribe from this mailing list, send email to majordomo@enhydra.org
with the text "unsubscribe instantdb" in the body of the email.
If you have other questions regarding this mailing list, send email to
the list admin at owner-instantdb@enhydra.org.

-----------------------------------------------------------------------------
To unsubscribe from this mailing list, send email to majordomo@enhydra.org
with the text "unsubscribe instantdb" in the body of the email.
If you have other questions regarding this mailing list, send email to
the list admin at owner-instantdb@enhydra.org.