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Unknown levels of sub-element extractionby onegative (Scribe) |
on Dec 06, 2008 at 03:40 UTC ( [id://728478]=perlquestion: print w/replies, xml ) | Need Help?? |
onegative has asked for the wisdom of the Perl Monks concerning the following question:
Dear Monks,
I am having difficulty in building a looping construct to take an initial element and perform a database lookup of its sub-elements which can contain sub-elements which results in the need to then perform additional lookups of one or more elements which again may contain more sub-elements which again may require an additional lookups of sub-elements until the sub-elements can no longer be sub-divided. Then all the while collecting the lowest common denominator of the elements called DEVICES and storing in a single array to be returned as a result. Here is a look the best I can represent of what the data could look like. I am using psuedo-data to represent what I am trying to accomplish. There are three types of data. Group, User, Device. So the top level is a Group which can contain any of the data types described above.
And my results would be DEVICE1 ... DEVICE17 So the initial query is to GROUP1 which contains a sub-group and 3 devices. So I store the 3 devices and then I need to process GROUP2 which contains 2 sub-groups, 2 devices and a user. Then I store those 2 devices in the original array and then process GROUP3, GROUP4 and USER1 to extract their devices which I again store in the device array and so on until I can't break down any sub-elements further. The problem I am having is understand the logic construct that needs to be used to extract devices from the initial group and then sub-group and/or users embedded as members of the subsequent elements extracted. The sub-elements could contain many layers of sub-groups after sub-groups and this is where I am having trouble understanding how I would build the logic. I can code most of it but I am really having trouble grasping the deeper logic to continue to process sub-tree after sub-tree without writing the results to files and then reading them after I have exhuasted the sub-trees to the LCD. If I just had an example to see I think the light would go on! But I keep hitting a deadend trying to build the logic in my mind. Any and all suggestions would be greatly appreciated. Thanks in advance for your help, Danny
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