Drupal adding rows in comment storage - Where to edit 'INSERT' query? - php

Question

I edited the 'comment' table in my Drupal MySQL database to add two rows. This is because I have a page that takes in a URL parameter, so while there is one page, I need to distinguish between the values of that parameter for comments. I'm having trouble editing my comment.module to edit the MySQL query. I can't find any kind of 'INSERT into...' query anywhere, not just in that file. I've looked through everything in the comment module folder.
What appears to be what affects the database insertion is the comment_publish_action() function in comment.module but I'm still running into some problems regarding the added columns, as they don't have default values.
Here's that function, 'typenode' and 'idofnode' are the added columns with test values:
function comment_publish_action($comment, $context = array()) {
if (isset($comment->subject)) {
$subject = $comment->subject;
$comment->status = COMMENT_PUBLISHED;
}
else {
$cid = $context['cid'];
$subject = db_query('SELECT subject FROM {comment} WHERE cid = :cid', array(':cid' => $cid))->fetchField();
db_update('comment')
->fields(array(
'status' => COMMENT_PUBLISHED,
'typenode' => 'player',
'idofnode' => 1239
))
->condition('cid', $cid)
->execute();
}
watchdog('action', 'Published comment %subject.', array('%subject' => $subject));
}

Answer 1

Edit comment.module is not good idea. During next core updates all changes will be lost. Better to create a custom module and implement some hooks there.
There is function comment_save($comment) which perform steps to insert / update new comment. In this function you can find a line drupal_write_record('comment', $comment); which do insert or update of db table 'comment' (dependence on logic). But before this line there is hook module_invoke_all('comment_presave', $comment); which allows you to modify $comment object before it will be store in database. This is good way to go - implement this hook in custom module and do modifications there.
function custom_module_comment_presave($comment) {
//add rows info here
}