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Re: Message storing problem.

by nate (Monk)
on Jan 21, 2001 at 00:00 UTC ( [id://53243]=note: print w/replies, xml ) Need Help??


in reply to Message storing problem.

In case you care, here's the table structure that the Everything Chatterbox system uses:
CREATE TABLE message ( message_id int(11) DEFAULT '0' NOT NULL auto_increment, msgtext char(255) DEFAULT '' NOT NULL, author_user int(11) DEFAULT '0' NOT NULL, tstamp timestamp(14), for_user int(11) DEFAULT '0' NOT NULL, PRIMARY KEY (message_id), KEY for_user (for_user) );

This basically breaks down to:

  • message_id -- arbitrary AUTO_INC primary key
  • msgtext -- 255 chars of communication
  • author_user -- reference to authors's unique ID
  • tstamp -- timestamp set on insertion of message, used for ordering
  • for_user -- optional field, if left blank it's considered "chat" if set, it becomes a "message" for whatever user ID it references

    For chat, your sql query looks something like:

    my $expiration_seconds = 500; $dbh->prepare("SELECT * FROM message WHERE for_user=0 AND unix_timestamp(now())-unix_timestamp(tstamp) + < $expiration_seconds ORDER BY tstamp");

    then for viewing a user's specific messages:

    my $UID = getUserIdSomehow(); $dbh->prepare("SELECT * FROM message WHERE for_user=$UID ORDER BY tstamp");

    It's really a pretty simple system, but it does depend on having numeric IDs that you can look up your users with. And don't worry too much about running out of INT -- 32-bits gives you lots of room to talk.

    -nate

  • Replies are listed 'Best First'.
    Re: Re: Message storing problem.
    by salvadors (Pilgrim) on Jan 21, 2001 at 00:30 UTC
      my $UID = getUserIdSomehow(); $dbh->prepare("SELECT * FROM message WHERE for_user=$UID ORDER BY tstamp");

      Surely you don't prepare the query with a variable in it? You should be using placeholders:

      my $UID = getUserIdSomehow(); my $sth = $dbh->prepare("SELECT * FROM message WHERE for_user=? ORDER BY tstamp");
      which then gets executed with $sth->execute($UID)

      Tony

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