well i have a data in text that is like this:
group user
group user2
group user3
group3 user
group3 user2
group4 user3

and i want to print it out.

but i want to print like this

group user, user2 and user3
group3 user and user2
group4 user3

any ideas ?

im getting headache trying to solve it.

like i dont know how to merge the group and still associating the user reading from a data base.

any1 give me an extra hand any doubt just ask .
thx

As long as your data set isn't huge you can read them it into a hash of array refs keyed on the group then print it:


~Charlie

http://www.perldoc.com/...8.4/pod/perldsc.html

How about of huge data? What synopse would you use?

I imagine, that the users for one group must be anyway collected, then printed.
Then print is done per group.

I was thinking about printing each user one by one, that would be need only for user number in a gruop would be really huge, so printing per group would be a good idea.

Best regards,
Webmaster33

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If it got to that point, I would switch to something like MySQL or PG to store the data instead of flat files. In fact, I'd opt for that to start with. I never did like working with flat files much :)


Then you'd potentially be looping over the file several times. Once to collect a list of groups then once for each group in the list to collect a list of users. That could get very slow if the data set was in fact large enough to require this. Again, thats an indicator that it's time to move to a RDBMS.


I find it much easier to gather a list then print rather than printing as I find them. You have much more control over your data (i.e. sorting, formatting, etc.) in list form. If you just loop though the file and print them as you find them you lose much of that control. I guess it all depends on what you're doing with the data though.

One thing to remember is that a lot of this work can more efficiently be done at the DB level if you use MySQL or some other DB.

~Charlie

Yes, I aggree, for huge data RDBMS is better, but that was not the original proposal...
I don't like flat files, too

Yes, but we supposed huge files, so loading everything into memory is not a possible option...
So for huge files, processing the less possible data together, then flush/print out is the only option.

Best regards,
Webmaster33

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Thx chaz u helped me alot with this ...

im not usual to hash in this way but i was read that page ... trying to understand it ...

i appreciate your help.

thx again..

and i agreed with u if it goings to be huge move to something better like mysql or pg