<?
function db_update_190_pre() 
{
	//before we do this, make sure we set the configuration variables based on the conferences.
	$q=mysql_query("SELECT * FROM conferences WHERE type='sciencefair' AND year>0");
	while($r=mysql_fetch_object($q)) {
		echo "  Updating config for year={$r->year} to conferences_id={$r->id}\n";
		mysql_query("UPDATE config SET conferences_id='$r->id' WHERE year='$r->year'");
	}
}

function db_update_190_post()
{
	global $config;
	$q=mysql_query("SELECT DISTINCT var FROM config WHERE section='system'");
	while($r=mysql_fetch_object($q)) {
		echo "  Upgrading system variable $r->var ...  ";
		$q2=mysql_query("SELECT * FROM config WHERE var='$r->var' ORDER BY year DESC LIMIT 1");
		$r2=mysql_fetch_object($q2);
		if($r2->year!=0) {
			echo " copying from year {$r2->year} ...  ";
			mysql_query("UPDATE config SET conferences_id=0, year=0 WHERE var='$r->var' AND year='$r2->year'");
		}
		else 
				echo " no year based record to udpate ";

		mysql_query("DELETE FROM config WHERE var='$r->var' AND (conferences_id>0 OR year>0)");
		echo " deleted ".mysql_affected_rows()." old year-based records\n";
	}
}

?>