See APEX Debug info in PL/SQL and SQL Developer

When developping Oracle APEX apps I like to instrument my code with APEX_DEBUG and/or Logger.

With our APEX Office Print (AOP) PL/SQL API and APEX Plug-in we did the same, we use APEX_DEBUG and Logger behind the scenes to allow you to see what it going on. But when I tried to view the APEX debug messages in SQL Developer, I didn't see any. Christian Neumueller of the APEX Dev team, gave me the answer: (more...)

Monitoring your Oracle APEX environment; when is a good time to do an upgrade?

Yesterday Oracle released Oracle APEX 19.1. We typically upgrade our environment within a week.

The question is always, when is a good time to upgrade?

As we are hosting multiple applications and sites in our environment, we want to find a spot with minimal impact to our customers. For some applications which are only accessed by some people in Belgium, it's very easy to schedule an upgrade at night as the chances are not (more...)

Where are my static application files of Oracle APEX?

Ever got the error that there's an issue with your environment because the Application Express files have not been loaded when you try to open Oracle APEX in your environment?


Since the Announcement of the availability of Oracle APEX Static Resources on a Content Delivery Network I typically configure APEX to use the CDN.

Steps to do so for the entire environment:
  • Navigate to the apex/utilities subdirectory from the directory you unzipped APEX to
  • Connect to your (more...)

Including an image from APEX Static Application Files in an email

Some people use APEX Office Print (AOP) to send out HTML emails based on a custom HTML template they created. Today we got a question in our AOP support inbox how to include images in those emails.

In an AOP Template, you can use a tag {%image} and AOP will replace that tag with a base64 encoded image. This works great when you open the resulting HTML file in a browser, but when using emails (more...)

Region only shown in development mode in Oracle APEX

In the last months, I had to look up several times in different projects how to show a region only when I was logged in into the App Builder in Oracle Application Express (APEX). So I thought to write a quick post on it.

In one project we had to log in with different users to test the behavior of the authorization schemes, so people saw the things they should see and could do the (more...)

The best free database… Google is wrong!

When you search on Google for "the best free database", the below is what you get (search done 11-NOV-2018 and again on 12-JAN-2019 and 28-JAN-2019). To my surprise, there's no Oracle on the list? The reason is Google took the answer from this review. As I don't want people to see this screenshot, I put in red what is wrong with the answer, so in case Google shows images, and people don't read (more...)

Trying to decide which APEX events to attend? Here’s where I’ll be.

I love going to conferences, to catch up with friends, be part of the vibrant Oracle APEX community, gain and share knowledge and of course demo APEX Office Print (AOP).

Conferences are a great way to get some new ideas and insights. You learn not only from the content but even more from the different cultures and background of people and the way they approach things.

My schedule till June looks like this:

ITOUG Tech (more...)

APEX Office Print (AOP) 19.1: Printing and Exporting made easy in Oracle APEX

To start the new year in an awesome way, we released APEX Office Print (AOP) 19.1 on January 11th. I typically don't blog about every new AOP release, but this is an important release in our history of the product.

Our dream is that every developer can use AOP, that is why in AOP 18.1 (released September 2018) we made a Free Cloud Tier.

With AOP 19.1 we go one step further... from (more...)

Upgrading of Oracle APEX 18.x and future

Late September 2018 Oracle Application Express (APEX) 18.2 was released.

Since 2018, Oracle adopts a new versioning for their software, and APEX is following that. The plan of the Oracle APEX development team is to do two releases a year which carry the year and the release number of that year e.g. 18.1, 18.2, 19.1.

I like this new way of providing us with new releases. You don't know the (more...)

Increasing Maximum Web Service Requests in Oracle APEX 18.1

While running our final tests of APEX Office Print (AOP) 18.1 we hit "ORA-20000: Issue calling Main AOP Service (REST call: ): ORA-20001: You have exceeded the maximum number of web service requests per workspace."


When you login into the Internal Workspace and navigate to a workspace, there's a setting for  Maximum Web Service Requests. The default value is 1000 requests per 24h (rolling window).

If you know that AOP has next to (more...)

Replace deprecated apex_util.string_to_table (APEX 5.1/18.1)

Sometimes the Oracle APEX documentation announces some packages will become deprecated in a release. It's not that those packages are suddenly gone, but you should not use them anymore. Your code will run fine still, but in the future, APEX might take it out completely, so it's best to replace them with the new package.

One of those packages announced in Oracle APEX 5.1 that are deprecated, and which I used a lot, was (more...)

"ORA-22902: CURSOR expression not allowed" in ORDS and APEX and how to fix them

When you want to define different blocks of data, some hierarchical, some not, you can do that by using the cursor expressions in SQL. An example of a query looks like this:

  select
    c.cust_first_name,
    c.cust_last_name,
    c.cust_city,
    cursor(select o.order_total, order_name,
              cursor(select p.product_name, i.quantity, i.unit_price
                (more...)

Hide certain objects on an APEX page

A few days ago I got a question on how to hide the title row from the Interactive Report Pivot view.
So the person didn't want to show the red area:


The solution to this problem is to add the following CSS to your page:


table.a-IRR-table--pivot tr:nth-child(3) {
    display:none;
}

The result is this - the title is gone:


Doing this blog post is not about giving the solution to the above problem. (more...)

I’ll be at APEX Meetup Munich: Thu 19 Jul 2018

Just a quick note I'll do two presentations at the APEX Meetup in Munich on Thursday, July 19th 2018.

In the first presentation I'll bring you to a virtual and augmented world, entirely build in Oracle Application Express (APEX). There are 30 Google Cardboards available to make the experience complete. Fun guaranteed! :)


At KScope I was also interviewed by Bob Rhubart on my talks over there, which the AR/VR presentation was one (more...)

My top 5 APEX 18.1 Plugins

With every new version of Oracle Application Express (APEX) new features are added and the life of a developer is made even easier. If the feature set is not enough or you see you need to build the same functionality more often, you can always extend APEX with plug-ins.

There are six different types of plugins: dynamic action, item,  region, process, authentication scheme and authorization scheme.

Plug-ins are absolutely fantastic to extend the native functionalities (more...)

Automatically capture all errors and context in your APEX application

Let me start this post with a conversation between an end-user (Sarah) and a developer (Harry):

End-user: "Hey there, I'm receiving an error in the app."
Developer: "Oh, sorry to hear that. What is the message saying?"
End-user: "Unable to process row of table EBA_PROJ_STATUS_CATS.  ORA-02292: integrity constraint (XXX.SYS_C0090660) violated - child record found"
Developer: "Oh, what are you trying to do?"
End-user: "I'm trying to delete a category."
(more...)

How to Export to Excel and Print to PDF in Oracle APEX? The answer…

Two questions that pop-up a lot when I'm at a conference or when doing consulting are:
  • How can I export my data from APEX to Excel?
  • How can I print to PDF? Or how can I get a document/report with my data?
The reason those questions are asked every time again is that although those features exist to a certain extent in APEX, what you actually want, is not shipped with Oracle Application Express (APEX), at (more...)

Error!?! What’s going in APEX? The easiest way to Debug and Trace an Oracle APEX session

There are some days you just can't explain the behaviour of the APEX Builder or your own APEX Application. Or you recognize this sentence of your end-user? "Hey, it doesn't work..."

In Oracle APEX 5.1 and 18.1, here's how you start to see in the land of the blinds :)

Logged in as a developer in APEX, go to Monitor Activity:


 From there go to Active Sessions:



You will see all active (more...)

Facebook, Google and Custom Authentication in the same Oracle APEX 18.1 app

Oracle APEX 18.1 has many new features, one of them is called Social Login.

On the World Cup 2018 Challenge, you can see the implementation of this new feature. The site allows you to sign-up or login with Facebook, Google, and your own email address.


It's even nicer that if you register with your email, but later decide to sign-up with Google or Facebook, it will recognize you as the same user if (more...)

The World Cup 2018 Challenge is live… An app created 12 years ago to showcase the awesome Oracle APEX


Since 2006 it's a tradition... every two years we launch a site where you can bet on the games of the World Cup (or Euro Cup). This year you find the app at https://www.wc2018challenge.com

You can read more about the history and see how things look like over time, or you can look on this blog at other posts in the different years.

The initial goal of the app was to showcase what (more...)