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Kozz Re: Limit to Line Length?

by Kozz (Friar)
on Jan 26, 2001 at 22:18 UTC ( #54590=note: print w/replies, xml ) Need Help??


in reply to Limit to Line Length?

This is good advice, and good questions.
No, I'm not sure that it's not a logic issue. It's running on Linux, Perl 5.005_03. And the text editor doesn't have anything to do with it, since when I'd grep the text file for a pattern which is SUPPOSED to be there, it wouldn't show up. And again - the only thing touching these files were perl scripts.

There are, however, a few things going on in the script which could have some consequences... primarily, my former bad habit of open,flock,read,close followed by open,flock,write, close rather than rewinding the file, writing, truncating, and closing.

Further research leads me to realize that the dates contained within the records indicate that nothing past a certain date was appearing, and since new records are simply appended to the file, you might indeed be right that this is a flocking issue.

Notwithstanding my confidence in my ability to use FLOCK, I still think I made some mistakes, and I appreciate Tilly's soft criticism which made me re-think my methods.

I think I'll go look at and fix some code. I humbly thank all of you for your research and insight. :-)

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[erix]: then you might as well send that patch to the DBIC guys :)
[Corion]: erix: Yeah, I just found that it has no documentation at all on how to circumvent/ eliminate "1+n SELECTs" by building a local hash... I guess I have to make ->has_many do the hash lookup instead of doing the SQL query. But as the problem ...
[Corion]: ... has only manifested itself so far through the puzzled questions of other bystanders, I won't go deeper at this time. But the DBIx::Class documentation could well do with a document on how to make "it" (that is, ORMs in general) faster ;)
[Corion]: I find that DBIx::Class, like most ORMs makes things easy until they become performance critical and then makes it horribly hard to change things because the design is highly inflexible if you don't already know about the problems of 1+n :-/
[choroba]: that's why I don't like similar libraries. They pretend you don't have to learn SQL, but in the end, you have to learn how SQL plus to overcome their own limitations
[Corion]: "Just write the proper SQL beforehand" is of course the appropriate solution, but if you did that, you wouldn't/couldn't use DBIx::Class either. At least not in an obvious (to me) way.
choroba scratches a "how"
[Corion]: choroba: Exactly... But maybe that's just because I'm old and grumpy ;)

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