like single for typecho | Typecho 免插件文章点赞

functions.php

<?php 
function likeSingle($cid) {
	$db = likeSingleDb();
	if ($db == null)  Typecho_Response::throwJson(array('status'=>-1,'msg'=>'数据库有误!'));
	$prefix = $db->getPrefix();
	if(!cid) Typecho_Response::throwJson(array('status'=>0,'msg'=>'请选择喜欢的文章!'));
	$likes = Typecho_Cookie::get('likes');
	if(empty($likes)){
		$likes = array();
	} else {
		$likes = explode(',', $likes);
	}
	if(!in_array($cid,$likes)){
		$row = $this->db->fetchRow($this->db->select('table.contents.likes')->from('table.contents')->where('cid = ?', $cid)->limit(1));
		$this->db->query($this->db->update('table.contents')->rows(array('table.contents.likes' => (int)$row['likes']+1))->where('cid = ?', $cid));
		array_push($likes,$cid);
		$likes = implode(',', $likes);
		Typecho_Cookie::set('likes',$likes);
		Typecho_Response::throwJson(array('status'=>1,'msg'=>'点赞成功'));
	}
}
function likeSingleDb() {
	$db = Typecho_Db::get();
	$type = explode('_', $db->getAdapterName());
	$type = array_pop($type);
	$prefix = $db->getPrefix();
	try {
		$select = $db->select('table.contents.likes')->from('table.contents');
		$db->query($select, Typecho_Db::READ);
		return $db;
	} catch (Typecho_Db_Exception $e) {
		if(('Mysql' == $type && (1054 == $code || '42S22' == $code)) || ('SQLite' == $type && ('HY000' == $code || 1 == $code))) {
			try {
				if ('Mysql' == $type) {
					$db->query("ALTER TABLE `".$prefix."contents` ADD `likes` INT(8) NOT NULL  DEFAULT 0;");
				} else if ('SQLite' == $type) {
					$db->query("ALTER TABLE `".$prefix."contents` ADD `likes` Integer NOT NULL  DEFAULT 0");
				} else {
					return null;
				}
				return $db;
			} catch (Typecho_Db_Exception $e) {
				return null;
			}
		}
	}
	return null;
}
?>

如何调用呢