用PHP改变MYSQL字段的排序位置

Posted 2021-02-26

Quick little snippet for changing the ordering of a field in a mysql database.

function changeOrderNum($currentOrderNum, $newOrderNum) {
	$yourTableName = "";
	$orderField = "";
 
	if($newOrderNum < $currentOrderNum) {
		$update1 = mysql_query("UPDATE $yourTableName SET $orderField = $orderField+1 WHERE $orderField >= '$newOrderNum' AND $orderField < '$currentOrderNum'") or die(mysql_error());
	} else {
		$update1 = mysql_query("UPDATE $yourTableName SET $orderField = $orderField-1 WHERE $orderField <= '$newOrderNum' AND $orderField > '$currentOrderNum'") or die(mysql_error());
	}
}