AW: How to check if database is available

["Hiller, Frank RD-AS2" <Fr...@heidelberg.com>]

Hi Tom,

ok, I did that.
I read the parameters for the database (protocol, subprotocol, ...) from database_repository.xml.
Then I try to establish a connection to the DB. If that fails the DB is not available.

You don't think this could be a functionality that PB API could provide?

Frank 

-----Ursprüngliche Nachricht-----
Von: Thomas Dudziak [mailto:tomdzk@gmail.com] 
Gesendet: Freitag, 19. August 2005 09:48
An: OJB Users List
Betreff: Re: How to check if database is available

On 8/19/05, Hiller, Frank RD-AS2 <Fr...@heidelberg.com> wrote:

> how can one check via OJB whether the database is avaialable before 
> establishing a connection to it?

I think that in JDBC you'd have to try to establish a connection to it and if that fails, then likely the database is not available (for whatever reason). AFAIK there is no other generic way (though individual databases may provide other means).
Since OJB builds upon JDBC, you probably got to try to establish a connection and execute the query that you've defined as the keep-alive query, and see whether this is possible.

Tom

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Re: How to check if database is available

[Thomas Dudziak <to...@gmail.com>]

On 9/2/05, Hiller, Frank RD-AS2 <Fr...@heidelberg.com> wrote:

> ok, I did that.
> I read the parameters for the database (protocol, subprotocol, ...) from database_repository.xml.
> Then I try to establish a connection to the DB. If that fails the DB is not available.
> 
> You don't think this could be a functionality that PB API could provide?

You misunderstood me, I was suggesting that you simply try to
establish a connection *via* the PB - much in the same way as Ribi was
suggesting, or perhaps by executing a simple query with the broker
instance - not outside of OJB (of course this would work too).

Tom

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