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Re: Re: Re: Re: Re: Re: DB_File, not saving

by jsprat (Curate)
on Jul 18, 2003 at 00:36 UTC ( #275461=note: print w/ replies, xml ) Need Help??


in reply to Re: Re: Re: Re: Re: DB_File, not saving
in thread DB_File, not saving

I must be able to tie %chat to both objects otherwise it's useless

Pretty strong words, partner ;-) I think what you mean is that to pull this off you must be able to represent the data in a sorted manner.

First off, sauoq was right on about IxHash.

Second, diotalevi says to use $DB_BTREE. An excellent suggestion, as long as you use a sensible key - maybe date/time stamp - and be aware of the possibility of duplicates. It will always be sorted - it's stored in a balanced tree. The key your script uses is $cnt, but I don't see it being initialized anywhere (probably not a sensible key ;). Every message is stuffed into the same slot, overwriting the previous message.

The most straightforward short-term solution for you IMO would be to use $DB_RECNO like so:

# tie your array to the file tie @chat, 'DB_File', 'chat', O_CREAT | O_RDWR, 0644, $DB_RECNO; # push the message info onto the array push @chat, "Message number $_" for (1 ..20); # print the last five messages print join "\n", @chat[-5 .. -1]; __END__ output: Message number 16 Message number 17 Message number 18 Message number 19 Message number 20

You'll be able to treat @chat like an ordinary array. As a bonus, you'll be able to view or modify the chat db file with any text editor.


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