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Editorial Team
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Asked: 2026-05-22T18:23:22+00:00

structure CREATE TABLE IF NOT EXISTS `blabbing` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username`

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structure


CREATE TABLE IF NOT EXISTS `blabbing` (   
 `id` int(11) NOT NULL AUTO_INCREMENT,
  `username` varchar(255) CHARACTER SET utf8 NOT NULL,
   `msg_date` datetime NOT NULL DEFAULT '0000-00-00 00:00:00'
   `body` varchar(255) CHARACTER SET utf8 NOT NULL,
     PRIMARY KEY (`id`)
    ) ENGINE=MyISAM  DEFAULT CHARSET=latin1 AUTO_INCREMENT=307 ;

Also if I want to add a responseto field can I use the same structure as the body field because this is a response and will have the same type of data that the field.

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1 Answer

  1. Editorial Team
    CREATE TRIGGER trig_tablename_insert
BEFORE INSERT ON `tablename`
FOR EACH ROW SET NEW.id = md5(username + body + CAST(msg_date AS CHAR));

    Since this is likely a primary key, using a hash function on an indexed column should be avoided. Hash functions are not sequential, so an ordered index will get fragmented VERY quickly.

    Your best bet is to create a trigger to check the values don’t already exist, or put extra code as part of the insert. It will make for much faster inserts. Use an EXISTS with a subquery searching for a match.

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