【www.gdgbn.com--php常用代码】

数据表参考:
代码:--------------------------------------------------------------------------------
CREATE TABLE `mf_sort` (
`sortid` SMALLINT( 3 ) UNSIGNED NOT NULL AUTO_INCREMENT ,
`main` TINYINT( 2 ) UNSIGNED NOT NULL ,
`parentid` SMALLINT( 3 ) UNSIGNED NOT NULL ,
`layer` SMALLINT( 3 ) UNSIGNED NOT NULL ,
`orders` TINYINT( 2 ) UNSIGNED NOT NULL ,
`sort` VARCHAR( 100 ) NOT NULL ,
PRIMARY KEY ( `sortid` ) ,
INDEX ( `main` , `parentid` , `layer` , `orders` )
);
--------------------------------------------------------------------------------
关键的函数
PHP代码:--------------------------------------------------------------------------------
function get_main_layer_orders($parentid)
{
global $x_db;
$sql = "select `main`, `layer`, `orders` ";
$sql .= "from `mf_sort` ";
$sql .= "where `postid`="$parentid"";
$x_db->exec($sql);
$data = $x_db->get_data();
$layer = $data[0]["layer"]+1;
$main = $data[0]["main"];
$orders = $data[0]["orders"];
$sql = "select `sortid` from `mf_sort` ";
$sql .= "where `parentid`="$parentid"";
$x_db->exec($sql);
$n = $x_db->n;
if ($n>0)
{
$lastid = $parentid;
get_lastid($lastid);
$sql = "select `orders` from `mf_sort` ";
$sql .= "where `sortid`="$lastid"";
$x_db->exec($sql);
$data = $x_db->get_data();
$orders = $data[0][0];
$sql = "update `mf_sort` ";
$sql .= "set `orders`=`orders`+1 ";
$sql .= "where `orders`>$orders and `main`="$main"";
$x_db->exec($sql);
$orders = $orders + 1;
return array($main, $layer, $orders);
}

本文来源：http://www.gdgbn.com/jiaocheng/1497/