Every day I learn something new in ABAP. Sometimes I’d rather not learn them. Like this one.
Table T056P has a date field. While SELECTing this table using the date as criteria I couldn’t get any result even though the code seemed correct. Using SE16N I found that the date range was also not working as expected: it would only should results if the final date was put in the LOW field and the initial date in the HIGH. Bizarre.
John created transaction ZFB01 and associated it with program ZFB01 which, after doing some stuff, does a CALL TRANSACTION on FB01. Then came his friend Mike and ran transaction ZFB01.
He managed to start running it because he had permissions to do it. But half way through he got an error because he doesn’t have permissions to run transaction FB01.
Both John and Mike knew that the system administrators would never ever give Mike permission to run FB01.
If you read Abapinho you already know how much I like exception classes. But this is not the only ABAP mechanism for dealing with errors.
There is another one, called ASSERT, which should be used more often.
If you’re not already using ABAP Objects you’re chicken.
If you use them, I do hope you’re following the best practice of using class exceptions.
And if you’re using class exceptions you better understand the best way of using them, particularly the advantages of chaining them.
This said, here’s what brings us here today. In the post about chained exceptions I showed a way to get the text of the deepest exception in the chain by using a WHILE loop:
I’ve been using more and more references in ABAP.
I used to use REF TO only for classes but I’ve been finding more and more advantages in using them for other data types. But, just like in C++, care must be used when dealing with data references. Things can easily go very wrong.
In this article, I’ll try to show you how to use and how not to use REF TO DATA. Let’s start by an example of how not to do it.
The other day a very strange thing happened to me. I was sending SY-TABIX as a parameter into a method. Before the call it contained 1 but, once inside, the parameter’s value was 0. Weird. o_thingalizer->very_strange_thing(sy-tabix). I was hearing “Why?! Why?!” repeatedly inside my head. But suddenly I understood it! When you send some field of the SYST as a by parameter you have to pass it by value and not by reference.
Some time ago I wrote an article explaining a way to automatically convert classic exceptions to exception classes. Today I use this technique in almost all the exception classes that I create (and I’ve even improved it, but I’ll leave that for another post).
This tip explains the exact opposite.
Sometimes, when comparing versions, several differences show up even when we did not make changes to the code. These differences may simply be a consequence of a Pretty Printer that altered code indentations. This makes comparing the versions confusing. But ABAP Workbench lets you configure the diff tool to ignore indentations and even comments. Just press F5 while there or go to the “Display Format> Settings” menu and adapt it to your needs:
When you want to use CL_GUI_ALV_GRID in a CONTAINER you must copy a standard Status GUI from another program. For example, the GUI Status “STANDARD” of the function group SALV. And then, in the screen’s PAI you do:
SET PF-STATUS ‘STANDARD’.
And thus the little standard buttons show up on your screen.
Don’t put off until tomorrow what you can do SY-DATUM.
While coding, it’s always good to have ways to speed up what we’re doing. A good one is automatic generation of templates for function and method calls.
I know 3 ways to achieve this.
Any object created in SAP must belong to a package.
Until recently, whenever I needed to create a program for a quick test I’d put it in the $TMP package. This way I was sure that it would never be transported to another system.
But sometimes I have the need to create stuff in the development system which, even though it should never be transported, should stay there forever. For example, development tools like ZSAPLINK and abapGit. But if we put everything under package $TMP it will soon be a big mess.
Today when I want to create a SALV I always create a DDIC structure with the data elements already set to show the texts I need. This avoids the need for code to manipulate the field catalog.
The ABAP editor is full of functionalities yet to be discovered.
When I do CTRL-F to search for text, the option I usually choose is “Find next”.
