Skip to main content

Oracle APEX Reporting Tips & Tricks - Book Review

Just after my not-so-positive previous book review, another author dared to ask me for my review. I asked him whether he was sure, and he - confidently - answered positive. This book, written by George Bara from Romania, is called "Oracle APEX Reporting Tips & Tricks", so - from the title -  it seems to be covering similar subjects as the previous one. 
Chapter 1, "Introducing APEX", covers the install of APEX and the creation of a first application. The good thing here is that the author doesn't rewrite the docs, but just links to them. Right after that he introduces the two main report types: the Classic Report and the Interactive Report.
Chapter 2, "Interactive Reports Basics", covers the cool options from the Action menu as well how a developer can dis- or enable these options. Also the Alternate and Icon view is explained, followed by a brief example on styling an IR using CSS. After that multiple download options are covered, including an extensive custom download format.
Chapter 3, "Advanced Interactive Reports", dives a little bit deeper (as you could expect with a title like that). Reports based on APEX collection as well as some neat tricks to get the current filtering settings from the APEX dictionary are explained.
Chapter 4, "Beyond Interactive Reports",  dives even deeper on the subject. Adding and managing checkboxes in reports and how you can use Dynamic Actions on these checkboxes is explained. This is followed by a few paragraphs on dynamic filtering (using the APEX_UTIL.IR_FILTER procedure). The last paragraph covers how you could show images in your report. In this chapter I am missing two things: The first is the option of filtering through URL parameters, as described here. The second one is the alternative for showing images, using the APEX Listener, as described in Kris' blog.    
Chapter 5, "Reporting on Web Services Results", explains how to create web services references and how to create a report on the results of a web service call.
Chapter 6, "PDF Report Printing", dives deep into Apache FOP with a lot of XLS-FO examples. Obviously the author has a lot of experience in this matter. As the final chapter, Chapter 7, "Complex Report PDF Printing", goes even deeper than that. Alas, other options for printing, like PL-PDF or even BI Publisher are not covered at the same depth. Also the more modern alternative (or replacement) for Apache FOP - using the APEX Listener for PDF printing - is not covered. In my opinion the book should get an update on that (as I never used all the XLS-FO tricks mentioned here myself)!

So as a conclusion, the book covers what it promises. Reporting and printing. Nothing more, nothing less. It is aimed at beginner to intermediate developers.
One (more) remark though. While reading you notice the book has lacked a proper editor review (it is self published). The author is not a native english speaker and that now and then that is noticeable - sort of similar when reading this blog ;-). There are some errors and sentences that don't flow smoothly. But if you go over that, it is a good book for a starting APEX developers (and for some parts for intermediate ones as well), who wants to know more about the reporting solution APEX offers.

Comments

Popular posts from this blog

Filtering in the APEX Interactive Grid

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...

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 ...

Stop using validations for checking constraints !

 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 ...