Skip to main content

ODTUG: Wednesday

By
This day started off with a very nice presentation about the joys of Javascript by Dan "The Man"McGhan. In a very nice pace he took the audience by the hand and increased the difficulty level step-by-step. His key message was; Don't be scared of Javascript, because if you look close enough it is looks more like PL/SQL than you might think at first sight. Get to learn jQuery and do your thing!
Another nice presentation was about "RESTful Web Services" by Jason Straub. He demoed how you can use webservices withing APEX to manage the buckets and contents on an Amazon S3 cloud environment. He also pointed out that not only APEX can consume webservices, but also can act as the source of a webservice. In order to achieve that you have to create a report on a public page that returns either XML or Json. He didn't show a demo, but promised to get out a paper or how-to out there next week. Have to try that myself soon!
Another fine session was Tim St. Hilaire's session on "APEX and AJAX". Nice examples on how to handcode your Ajax processes (the 'old' way) and how to new Dynamic Actions to do it the APEX 4-way.
Then, finally, it was my turn to show the coolest Plug-In of the conference - at least, that's my humble opinion ;-). Around 60 - 70 people showed up and the presentation went very well. ended right on time again!
After that, I didn't have the energy to attend another session and just had a beer at the bar with some other Europeans (Debra, Alex, Marco, Jonathan, Tim etc).
Then it was time for the "big party": good food, more than enough drinks and a very good comedian (John Heffron). After some more drinks in the Presedentail Suite (thanks Mike Riley) it was time to head off to bed....
Labels:

Comments

Post a Comment

Popular posts from this blog

apex_application.g_f0x array processing in Oracle 12

By
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 ...
Post a Comment
Read more

Filtering in the APEX Interactive Grid

By
Remember Oracle Forms? One of the nice features of Forms was the use of GLOBAL items. More or less comparable to Application Items in APEX. These GLOBALS where often used to pre-query data. For example you queried Employee 200 in Form A, then opened Form B and on opening that Form the Employee field is filled with that (GLOBAL) value of 200 and the query was executed. So without additional keys strokes or entering data, when switching to another Form a user would immediately see the data in the same context. And they loved that. In APEX you can create a similar experience using Application Items (or an Item on the Global Page) for Classic Reports (by setting a Default Value to a Search Item) and Interactive Reports (using the  APEX_IR.ADD_FILTER  procedure). But what about the Interactive Grid? There is no APEX_IG package ... so the first thing we have to figure out is how can we set a filter programmatically? Start with creating an Interactive Grid based upon the good o...
1 comment
Read more

Stop using validations for checking constraints !

By
 If you run your APEX application - like a Form based on the EMP table - and test if you can change the value of Department to something else then the standard values of 10, 20, 30 or 40, you'll get a nice error message like this: But it isn't really nice, is it? So what do a lot of developers do? They create a validation (just) in order to show a nicer, better worded, error message like "This is not a valid department".  And what you then just did is writing code twice : Once in the database as a (foreign key) check constraint and once as a sql statement in your validation. And we all know : writing code twice is usually not a good idea - and executing the same query twice is not enhancing your performance! So how can we transform that ugly error message into something nice? By combining two APEX features: the Error Handling Function and the Text Messages! Start with copying the example of an Error Handling Function from the APEX documentation. Create this function ...
Post a Comment
Read more