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From "Youssef Mohammed" <youssef.moham...@gmail.com>
Subject Re: Oracle database calling the web app?
Date Tue, 06 Jan 2009 22:31:07 GMT
you can also have your trigger call a java package where you can simply call
a web service (SOAP or RESTful).


Regards, Youssef


On Wed, Jan 7, 2009 at 12:26 AM, Edward Dowgiallo <eddowgiallo@gmail.com>wrote:

> Support for what you want to do is actually a feature in Oracle 11g.  For
> Oracle 10g, you want to look at the publish/subscribe support which is part
> of advanced queueing.  The documentation is available online at
> http://otn.oracle.com.
>
> Ed
>
> On Tue, Jan 6, 2009 at 5:22 PM, Bill Davidson <billdsd@gmail.com> wrote:
>
> > Is it possible to set up a callback like situation so that a trigger in
> an
> > Oracle 10g database can call a method in a currently running webapp
> > that's running in Tomcat 6?
> >
> > My situation is that I want to cache some infrequently changed database
> > data in memory but when that data does change in the database, I want
> > the web applications, running on multiple servers, to immediately pick
> > up the change.
> >
> > Right now, one idea I have for this is to have the database trigger
> > create a file in a file system that's shared by the database server and
> > the application servers and have the web apps check for the existence
> > of this file to know whether to update the cache.  It feels ugly and
> > means hitting a networked file system a lot but it seems like it should
> > work and it seems like it should not be as bad as hitting the database
> > constantly for something that doesn't change very often.
> >
> > I'd rather have the database send a message somehow to the web app that
> > it needs to update its cache of the data.  Any suggestions?
> >
> >
> >
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