Skip to main content

ODTUG Kaleidoscope 2008 : The pre-conference conference


The day started with a rather fierce thunderstorm, and I can tell you that if it rains in New Orleans it really rains! This day was a sort of warming-up for the real conference with three full day symposiums on Essbase, APEX and Fusion. I attended the ‘The Seasoning of Application Express - Must hear Succes Stories‘ symposium that started off with an impressive presentation of Scott Spendolini. His theme was ‘Less is more‘, what didn’t refer this own presentation as he managed to go to 431 slides in half an hour! After that Mike Hichwa from Oracle did an ‘Apex Update’. He told us that currently APEX is the most used tool within Oracle for internal applications. Oracle also releases products that are based on APEX, like Database Vault. And we got a sneak preview of the future of APEX: we will get updateable interactive reports, custom item types, easy way to attach files of any kind to a record and declarative AJAX support. And some other good news: SQL Developer will support logical and physical data modeling - so we don’t need Designer for that anymore. And from these datamodels APEX applications can be generated using templates.

The other five presentations were user experiences. They all come together at one point: Application development can be incredibly fast when you use APEX, and that’s exactly what the business needs: short term to market and agile development. The IT departments have some difficulties in this paradigm shift: the regular long term waterfall approach doesn’t work here. And the risk is that the business users will develop the applications themselves (again, just like they did using Excel and Access), just because it is - or seems to be - so easy.

Just before the Welcome Reception Thomas Kyte did a presentation on ‘How do you know what you know…‘. It was the same message as he delivered 1,5 year ago during Open World, but with different examples: Knowledge is good, but can also be bad. If you had an experience in the past, that doesn’t automatically mean it still counts, because things, like the Oracle database, change. BTW it’s always a great pleasure to attend one of Thom’s presentations.

Comments

Popular posts from this blog

Refresh selected row(s) in an Interactive Grid

In my previous post I blogged about pushing changed rows from the dabatase into an Interactive Grid. The use case I'll cover right here is probably more common - and therefore more useful!

Until we had the IG, we showed the data in a report (Interactive or Classic). Changes to the data where made by popping up a form page, making changes, saving and refreshing the report upon closing the dialog. Or by clicking an icon / button / link in your report that makes some changes to the data (like changing a status) and ... refresh the report.  That all works fine, but the downsides are: The whole dataset is returned from the server to the client - again and again. And if your pagination size is large, that does lead to more and more network traffic, more interpretation by the browser and more waiting time for the end user.The "current record" might be out of focus after the refresh, especially by larger pagination sizes, as the first rows will be shown. Or (even worse) while you…

Dockerize your APEX development environment

Nowadays Docker is everywhere. It is one of the main components of Continuous Integration / Continuous Development environments. That alone indicates Docker has to be seen more as a Software Delivery Platform than as a replacement of a virtual machine.

However ...

If you are running an Oracle database using Docker on your local machine to develop some APEX application, you will probably not move that container is a whole to test and production environments. Because in that case you would not only deliver a new APEX application to the production environment - which is a good thing - but also overwrite the data in production with the data from your development environment. And that won't make your users very excited.
So in this set up you will be using Docker as a replacement of a Virtual Machine and not as a Delivery Platform.
And that's exactly the way Martin is using it as he described in this recent blog post. It is an ideal way to get up and running with an Oracle database …

apex_application.g_f0x array processing in Oracle 12

If you created your own "updatable reports" or your custom version of tabular forms in Oracle Application Express, you'll end up with a query that looks similar to this one:
then you disable the "Escape special characters" property and the result is an updatable multirecord form.
That was easy, right? But now we need to process the changes in the Ename column when the form is submitted, but only if the checkbox is checked. All the columns are submitted as separated arrays, named apex_application.g_f0x - where the "x" is the value of the "p_idx" parameter you specified in the apex_item calls. So we have apex_application.g_f01, g_f02 and g_f03. But then you discover APEX has the oddity that the "checkbox" array only contains values for the checked rows. Thus if you just check "Jones", the length of g_f02 is 1 and it contains only the empno of Jones - while the other two arrays will contain all (14) rows. So for processing y…