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  Oracle Tips by Burleson

Computation and Processing Points in Detail

Instead of explaining, earlier in the chapter, when each of the processing points was executed, I decided to wait until this section so the explanation could be condensed into one section.  Otherwise the information would have been spread throughout the sections above. 

When I was first starting out, I found it difficult to know when to use which execution point and why one should be chosen over the other.  The following description helped me, and it should remove some of the confusion for you as well.

A review of where the regions are laid out in respect to the page rendering of each region is in order.  Figure 12.7 does not represent the layout for every page template in HTML DB, but is useful for the descriptions soon to be given.  For reference, this is the No Tabs page template.

There is a region named After Header that displays at the top of the page.  Then, located at the beginning of the HTML Body (the <body> tag), is an area named Region Pos 1.  Next in line is what HTML DB calls the Box Body.  The box body is surrounded by the Before Regions and After Regions execution points.  Following those regions are the remaining Region Positions and finally the Before Footer region.

During page rendering it is important to create processes in the proper execution point depending on what is to be accomplished.  There may come a time when page items being set in one computation or process need to be referred to in another computation or process.  They must be processed by the HTML DB engine in the proper order.  This can cause hours of frustration if the developer does not have a solid understanding of the order of things being executed during page rendering.

In regards to which is being executed first, the Computation or the Process, it is the Computation that is executed first.  In other words, if a Computation is executing in the before regions point and a Process executing in the before regions execution point, it is the Computation that will be executed first by the HTML DB engine.

The above book excerpt is from:

Easy HTML-DB Oracle Application Express

Create Dynamic Web Pages with OAE

ISBN 0-9761573-1-4   

Michael Cunningham & Kent Crotty


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