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Re: Re: Class::DBI Intro

by salvadors (Pilgrim)
on Aug 01, 2003 at 07:54 UTC ( #279877=note: print w/replies, xml ) Need Help??


in reply to Re: Class::DBI Intro
in thread Class::DBI Intro

The delete method is rather inefficient. When called, Class::DBI will issue one DELETE statement for each row in your table.

Yes. This is a deliberate design decision. The class in question may have explicit behaviours attached to the act of deleting (for example, you can set up triggers at the application level, rather than at the database.) The only way to cause these to be fired is to delete the objects one at a time.

It's fairly trivial to set up your own method to delete from the database in one pass if you're comfortable doing so. Replacing all your SQL is not really Class::DBI's goal. Its job is to remove all the boring trivial repetitive SQL from your application, freeing you up to spend the time writing the more advanced stuff yourself that can't be easily abstracted away.

Tony

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[choroba]: LanX I miss working in a bank sometimes...
[Corion]: Discipulus: Ooof. Especially yearly things are things I like to automate instead of trying to remember how I did things last year...
[Corion]: And the second rule that I've learned is, that there is no one-off job, so writing a program for it pays off almost immediately. The third rule is to give all my programs numbers and have them reproduce that number in the name of their output files. :)
[Discipulus]: the true part is that also specification change between years.. but well our job is cheap but dont abuse of us.. ;=)
[LanX]: Choroba: do you miss chaos with ties? apply at the US government.. ;)
[ambrus]: Corion: those are good rules.
[ambrus]: Discipulus: oh sure. the input data has different filenames every time I get them.
[ambrus]: the directory structure may be 1, 2, or 3 deep, it may have spaces in the filename or not, it has dates in various format, different keywords for the same meanings, and the dates and other keywords are assembled in various ways.

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