mirror of https://gitee.com/zorlan/skycaiji
122 lines
3.1 KiB
PHP
122 lines
3.1 KiB
PHP
<?php
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/*
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|--------------------------------------------------------------------------
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| SkyCaiji (蓝天采集器)
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|--------------------------------------------------------------------------
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| Copyright (c) 2018 https://www.skycaiji.com All rights reserved.
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|--------------------------------------------------------------------------
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| 使用协议 https://www.skycaiji.com/licenses
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|--------------------------------------------------------------------------
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*/
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namespace skycaiji\admin\model;
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/**
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* 数据缓存模型
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* 不继承model类直接调用db，防止不同表实例化的静态变量混淆
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*/
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class CacheModel{
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private static $instances;
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public $category='';
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public $table_name='cache';
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protected $cache_list=array();
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public function __construct($category=''){
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$this->category=$category;
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$this->table_name='cache'.($this->category?('_'.$this->category):'');
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}
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/*获取实例化类*/
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public static function getInstance($category=''){
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if(!isset(self::$instances[$category])){
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self::$instances[$category] = new static($category);
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}
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return self::$instances[$category];
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}
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/**
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* 获取数据库连接
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* @return \think\db\Query
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*/
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public function db(){
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try {
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$db=db($this->table_name);
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$db->getPk();
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}catch (\Exception $ex){
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$this->create_table();
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$db=db($this->table_name);
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}
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return $db;
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}
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public function getCount($cname){
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return $this->db()->where('cname',$cname)->count();
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}
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/**
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* 获取缓存
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* @param string $cname 缓存名称
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* @param string $key 缓存的数据键名
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* @return mixed
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*/
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public function getCache($cname,$key=null){
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$cache=$this->db()->where('cname',$cname)->find();
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switch($cache['ctype']){
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case 1:$cache['data']=intval($cache['data']);break;
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case 2:$cache['data']=unserialize($cache['data']);break;
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}
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return $key?$cache[$key]:$cache;
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}
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/**
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* 设置缓存
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* @param string $cname 缓存名称
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* @param string $value 缓存数据
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*/
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public function setCache($cname,$value){
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$data=array('cname'=>$cname,'ctype'=>0);
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if(is_array($value)){
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$data['ctype']=2;
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$data['data']=serialize($value);
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}elseif(is_integer($value)){
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$data['ctype']=1;
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$data['data']=intval($value);
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}else{
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$data['data']=$value;
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}
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$data['dateline']=time();
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$this->db()->insert($data,true);
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}
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/**
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* 缓存是否过期
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* @param string $cname 缓存名称
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* @param int $timeout 过期时间
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* @return boolean
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*/
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public function expire($cname,$timeout=72000){
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$cache=$this->getCache($cname);
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if(empty($cache)||abs(NOW_TIME-$cache['dateline']>$timeout)){
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return true;
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}else{
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return false;
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}
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}
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/**
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* 创建表
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* @return boolean
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*/
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public function create_table(){
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$tname=config('database.prefix').$this->table_name;
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$exists=db()->query("show tables like '{$tname}'");
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if(empty($exists)){
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$table=<<<EOT
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CREATE TABLE `{$tname}` (
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`cname` varchar(32) NOT NULL,
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`ctype` tinyint(3) unsigned NOT NULL,
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`dateline` int(10) unsigned NOT NULL,
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`data` mediumblob NOT NULL,
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PRIMARY KEY (`cname`)
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) ENGINE=MyISAM DEFAULT CHARSET=utf8
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EOT;
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db()->execute($table);
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}
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}
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}
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?>
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