Customizing DML in an APEX Interactive Grid

It should have been quite a relaxing Cricket World Cup final. After all, it was England v New Zealand. I was guaranteed to be on the winning side.
After several hours of nerve-shredding tension had failed to separate the teams England were awarded the trophy on the basis of dumb luck hitting more boundaries. The result was born with stoicism by the Black Caps, whose philosophy would, in other countries, be known as “Elite Niceness”. By a cruel twist of fate, Ben Stokes – England’s star all-rounder and Man of the Match – was actually born in Christchurch.
Oracle APEX has it’s own star all-rounder in the shape of the Editable Interactive Grid ( see what I did there ?)
As well as presenting information in the same way as an Interactive Report, it allows users to perform DML operations on the records it displays – provided it’s based on a single table.
What we’re going to look at here is how to base an Interactive Grid (IG) on a Query rather than a table whilst retaining the ability to perform DML operations on the displayed records. To achieve this, we’ll be customizing the PL/SQL that is executed when a DML operation is invoked in the IG.
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Installing APEX and ORDS on Oracle 18cXE on CentOS

It’s been rather a trying week.
Wales beat England in the Rugby on Saturday and every Welsh person alive has been observing the ancient tradition of rubbing English noses in it ever since.
My claim to Welsh heritage by marriage have been given short-shrift by Deb, whose accent has become rather more pronounced ever since the final whistle.

All in all, the onslaught of Welsh chauvinism has left me feeling rather like this :

Until things blow over, I’ve decided to spend more time in the shed. Fortunately, the Wifi signal is still pretty good so I’ve decided to use the free time by installing APEX 18.2 into an Oracle 18c RDBMS. As I’ve got time on my hands ( celebrations are unlikely to fizzle out for a couple of months yet), I’ve decided to follow Oracle’s recommendation and configure it to run on ORDS 18.4.
Specifically, what I’ll be covering here is :

  • installing APEX 18c
  • installing ORDS 18c
  • configuring APEX to run on ORDS
  • configuring ORDS to run on HTTPS with self-signed SSL certificates
  • using systemd to start ORDS automatically on boot

That should keep me occupied for a while…

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Upgrading to APEX 5 on Oracle XE 11g

It’s a Bank Holiday weekend here in the UK.
This is usually a time for doing odd-jobs as a distraction from watching the rain come down.
This time around, rather than subject you to another lament about the Great British Summer ( or lack thereof), I’m going to go through the steps needed to install APEX5 on Oracle 11gXE.

Now, I know that the documentation doesn’t mention Express Edition.
I also know that the instructions that Oracle do have for upgrading APEX on XE haven’t yet been updated to account for APEX5.
I know this because I’ve spent a wet Bank Holiday finding this stuff out the hard way so that (hopefully), you don’t have to.
What I’m going to cover here is :

  • Pre-installation checks
  • Getting APEX5
  • Installation
  • Configuration

I would say “let’s get cracking before the sun comes out”, but that would only give us until around the second week in July…
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Migrating the XE Database Management Application to a new version of APEX

I must confess to a weakness when it comes to throwing stuff away.
This is particularly true of techie stuff.
Whilst I have occasionally cannibalised an old machine for parts, there is a regrettably large part of the garage reserved for “vintage” hardware that I might just need at some point.

I’ve recently added to this hoard. I’ve finally gone and got a replacement for my ageing netbook.
As part of the configuration of the new machine, I’ve installed Oracle XE again.

I’m now poised to attempt an upgrade to a shiny new version of APEX.

First of all though, if you are similarly keen to upgrade from the venerable APEX 4.0, which XE ships with, to something more modern, your hoarding instincts may kick-in when it comes to the default Database Management Application.

Once you upgrade APEX 4 to any subsequent version, this application “disappears”.
The functionality it offers is readily available through SQLDeveloper (or indeed, any of the major Oracle Database IDE’s).
Alternatively, it’s a fairly simple matter to come up with your own, improved version.

Not convinced ? Oh well, I suppose we’d better save it for re-deployment into your new APEX environment.

What I’m going to cover here is :

  • Backing up the default XE ADMIN application
  • Tweaking the APEX export file
  • Restoring the XE ADMIN application

I’ve tested this process against both APEX4.2 and APEX5.0 running on Oracle XE11g.
In the steps that follow, I’m assuming that you’re upgrading to APEX5.0.
The main difference here is the APEX owning schema.
For APEX4.2, the owner is APEX_040200, in APEX 5.0 it’s APEX_050000.
As the APEX upgrade takes place entirely within the database, the steps that follow are platform independent.

Incidentally, if you’re wondering exactly how you would upgrade XE11g to this APEX version, details will follow in my next post.

NOTE – I’m assuming here that you’re doing this on your own personal playground 11GXE database and have therefore not
worried too much about any security implications for some of the activities detailed below.

Right, let’s get started…
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Oracle XE 11g – Getting APEX to start when your database does

They say patience is a virtue. It’s one that I often get to exercise, through no fault of my own.
Usually trains are involved. Well, I say involved, what I mean is…er…late.
I know, I do go on about trains. It’s a peculiarly British trait.
This may be because the highest train fares in Europe somehow don’t quite add up to the finest train service.
We can debate the benefits of British Trains later – let’s face it we’ll have plenty of time whilst we’re waiting for one to turn up. For now, I want to concentrate on avoiding any further drain on my badly tried patience by persuading APEX that it should be available as soon as my Oracle XE database is…
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Implementing a Database Authentication Scheme in APEX

The following tangential opening was written especially for Scott Wesley in the hope that he’ll be minded to point out any errors in what follows. The same applies to Jeff Kemp ( although I don’t know if he’s into the AFL).
Unlike me, both of these guys are APEX experts.

Football. It’s a term that means different things to different people.
To a European, it’s most likely to be a reference to good old Association Football ( or Soccer).
To an American, it’s more likely to be the Grid-iron game.
A New Zealander will probably immediately think of Rugby Union.
An Australian ? Well, it’s probably a fair bet that they’ll think of Aussie Rules Football.

On the face of it, the rules appear rather arcane to an outsider. 18-a-side teams kicking, catching and punching something that resembles a Rugby ball around a pitch that resembles a cricket oval. Then there is the scoring system.
“Nice Behind”, to an AFL player is more likely to be taken as a compliment of their skill at the game than an appreciation of their anatomy.

Then again, it’s easy to scoff at any sport with which you are unfamiliar.
For example, Rugby could be characterised as 30 people chasing after an egg. Occasionally, they all stop and half of them go into some strange kind of group hug. I wonder if the backs ever get paranoid because they think the forwards are talking about them ?

As for soccer, even afficionados will acknowledge that there’s something a bit odd about a game where 22 millionares spend lots of time chasing after one ball…when they’re not rolling around in apparent agony after appearing to trip over an earth worm. I mean, the ball isn’t that expensive, surely they can afford one each ?

The point of all of this ? Well, what is considered to be obscure, eccentric, or just plain odd often depends on the perspective of the observer.

Take APEX authentication schemes for example.
Whilst not the default, Database Authentication is a scheme that is readily available. However, there doesn’t seem to be much written on this subject.

In contrast, there is a fair bit out there about APEX Custom Authentication. A lot of it would appear to re-enforce the idea that implementing security by hand is fraught with difficulty.
Just one example can be seen here.

If we were to approach this topic from the perspective of looking to migrate an elderly Oracle Forms application – where each user has their own database account – to APEX, we might be attracted to the idea of a Database Authentication Scheme and want to find out more.

What follows is my adventure through setting up such an Authentication Scheme.
Specifically, I’m going to cover :

  • Creating an APEX Database Authentication Scheme
  • Default behaviour
  • Adding a Verification Function to restrict access to a sub-set of Database Users
  • The vexed question of password resets

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