Skip to main content

OOW 2009 : Wednesday

I started off with a good breakfast with my roomies Marco and Jacco. Because there wasn't any interesting session in the first timeslot (or I couldn't find it), I attended the Exhibition Hall - which is mainly the same as previous years. Everyone wants to 'scan your badge' so they can spam you afterwards.
Next there were two sessions I really liked, and - it may or may not be a coincidence - both were 30 minutes 'power sessions'. The first one was by Mark Drake, the Product Manager for XML DB, about Managing XML Content with APEX. Very good job, although having live demo's obviously are a risk...and that's why I like them!
The next one was about Row Level Security / VPD and APEX. The presenter had a good demo and explained the stuff nicely.
I followed the keynote from the OTN Lounge (it is less boring with a beer). It wasn't a surprise anymore that The Governator would attend. Arnold emphasized that technology will deliver the solution for CO2 reduction - he didn't say that technology was also the cause of all kinds of pollution...
Larry's story - the only presentation from Oracle without the safe harbor slide - didn't contain anything astonishing new: Oracle has Linux and VM (that's a three year old story); has an Exadata machine thats an (undefined) number of times faster than the one form IBM (Sunday's news..); My Oracle Support will get better; Fusion Apps are on their way (with demo).
The last real session of the day was Building a Mashup with APEX. The presenter painted out an architecture where you create webservices on your database objects, and consume those in APEX on XE. The reasons for doing so was that
- you don't need a license for XE (that's true, but you do need a license for the underlying database, so that's a non-argument)
- he thought that APEX itself would have a negative impact on the performance of his database (which is obviously also a non-argument, as APEX adds only a very little bit of overhead - and creating extra layers as he suggested will create more overhead)
- the DBA's didn't like the idea for having an 'application in the database': the database is for data, not for applications... (An misconception that some old school DBA's hang on to).

And at night : The Appreciation Event with Aerosmith. And they rocked - especially when you know that Steven Tyler (the leadsinger) is 61!
1 comment

Popular posts from this blog

Showing a success message after closing a modal dialog

APEX 5 comes with Modal Dialogs out of the box. Very neat. Especially for adding and changing data. And to minimise the number of time a user has to click, it could be useful to add a "Close Dialog" process after the actual data processing. When the data processing fails, the Dialog stays on top showing the error. When data processing runs fine, the Dialog is closed ... without any confirmation. And this might be scary for a shaky user.

So how can we provide the user some feedback? On Page 4 of the Sample Dialog Application you can see one solution: up on a Dialog Closed Event on the parent page it does a redirect to refresh the parent page appending the success message of the "Close Dialog" process. This has two drawbacks. First, it probably refreshes more than necessary. And second, if you're using multiple layers of dialogs (dialogs that open other dialogs) the message appears in the "parent dialog".
As an alternative you could follow these steps: 1…

A review of APEX World 2017 - Day 1

Last week the SS Rotterdam was the beautiful location of the largest gathering of APEX Developers worldwide. With around 380 (!) attendees a new high was set. And they came from all over the world : I spotted people from The Netherlands, Belgium, Switzerland, Austria, Croatia, Germany, Denmark, Norway, UK, Ireland and the USA. And I even might have missed one or two ….

The event started with a presentation by the “father of APEX”, Mike Hichwa, talking about "Oracle APEX Past, Present and Future”. Of course everyone is curious what the APEX future might bring: Friendly URL’s, automated testing, more JSON, concurrent APEX versions, third party Oauth 2 authentication (think Facebook, Google), APEX app diff and more, a lot more, REST capabilities. And now we have to wait for APEX 5.2 … and that might take a while! 
After this keynote, the conference split up in three tracks. After the coffee break I returned to to big theatre where Geertjan Wielenga talked about "Finally Javas…

Push changed rows to an Interactive Grid

For pushing changes from the database to the end user, the regular solution is using websockets. A change in a record is detected - using a trigger or using the CQN (Change Query Notification) feature - and a notification is send to a websocket server. That websocket server broadcasts the notification over a channel to all browsers that are tuned in to that websocket channel. Then the browser reacts to that notification, usually showing an alert or refreshing a report. This trick is described on multiple sites, just Google for "oracle apex websockets" or similar.

So back in the old days, we used that notification in the browser to refresh the (interactive) report. But along comes the Interactive Grid (IG). While he full-refresh mechanism still works for IG, an IG has also the option to refresh just one row.  So wouldn't it be awesome that just the changed row(s) get refreshed upon a change in the database, instead of the whole report? Can we do it ... yes we can!
First i…