<?php
defined('IN_IA') or exit('Access Denied');
use phprs\ezsql\Sql;

// 读取指定的系统缓存项 core_cache表中
function cache_read($key,$db) {
    $val = Sql::select('syweb_core_cache.`value`')
                        ->from('syweb_core_cache')
                        ->where('syweb_core_cache.`key`=?', $key)
                        ->get($db ,null);
    if(count($val)>0){
    	return iunserializer($val[0]["value"]);
    }
}


function cache_search($prefix,$db) {
    $rs = Sql::select('syweb_core_cache.*')
                        ->from('syweb_core_cache')
                        ->where('syweb_core_cache.`key` like ?', "{$prefix}%")
                        ->get($db ,null);

	$result = array();
	foreach ((array)$rs as $v) {
		$result[$v['key']] = iunserializer($v['value']);
	}
	return $result;
}

// 存储系统缓存
function cache_write($key, $data,$db,$pdo) {
	if (empty($key) || !isset($data)) {
		return false;
	}
	$record = array();
	$record['`key`'] = $key;
	$record['`value`'] = iserializer($data);

    $id = Sql::replaceInto('syweb_core_cache')->values($record)->exec($pdo)->lastInsertId();
	return $id;
}


function cache_delete($key) {
    return Sql::deleteFrom('syweb_core_cache')->where('`key`=?',$key)->exec($pdo);
}


function cache_clean($prefix = '') {
	global $_W;
	if (empty($prefix)) {
		$sql = 'DELETE FROM ' . tablename('core_cache');
		$result = pdo_query($sql);
		if ($result) {
			unset($_W['cache']);
		}
	} else {
		$sql = 'DELETE FROM ' . tablename('core_cache') . ' WHERE `key` LIKE :key';
		$params = array();
		$params[':key'] = "{$prefix}:%";
		$result = pdo_query($sql, $params);
	}
	return $result;
}