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138 lines
4.9 KiB
138 lines
4.9 KiB
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
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// +----------------------------------------------------------------------
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// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
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// +----------------------------------------------------------------------
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// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
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// +----------------------------------------------------------------------
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// | Author: liu21st <liu21st@gmail.com>
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// +----------------------------------------------------------------------
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namespace Think\Cache\Driver;
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use Think\Cache;
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defined('THINK_PATH') or exit();
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/**
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* 数据库方式缓存驱动
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* CREATE TABLE think_cache (
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* cachekey varchar(255) NOT NULL,
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* expire int(11) NOT NULL,
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* data blob,
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* datacrc int(32),
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* UNIQUE KEY `cachekey` (`cachekey`)
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* );
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*/
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class Db extends Cache {
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/**
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* 架构函数
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* @param array $options 缓存参数
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* @access public
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*/
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public function __construct($options=array()) {
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if(empty($options)) {
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$options = array (
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'table' => C('DATA_CACHE_TABLE'),
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);
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}
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$this->options = $options;
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$this->options['prefix'] = isset($options['prefix'])? $options['prefix'] : C('DATA_CACHE_PREFIX');
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$this->options['length'] = isset($options['length'])? $options['length'] : 0;
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$this->options['expire'] = isset($options['expire'])? $options['expire'] : C('DATA_CACHE_TIME');
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$this->handler = \Think\Db::getInstance();
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}
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/**
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* 读取缓存
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* @access public
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* @param string $name 缓存变量名
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* @return mixed
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*/
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public function get($name) {
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$name = $this->options['prefix'].addslashes($name);
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N('cache_read',1);
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$result = $this->handler->query('SELECT `data`,`datacrc` FROM `'.$this->options['table'].'` WHERE `cachekey`=\''.$name.'\' AND (`expire` =0 OR `expire`>'.time().') LIMIT 0,1');
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if(false !== $result ) {
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$result = $result[0];
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if(C('DATA_CACHE_CHECK')) {//开启数据校验
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if($result['datacrc'] != md5($result['data'])) {//校验错误
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return false;
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}
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}
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$content = $result['data'];
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if(C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
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//启用数据压缩
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$content = gzuncompress($content);
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}
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$content = unserialize($content);
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return $content;
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}
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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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* 写入缓存
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* @access public
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* @param string $name 缓存变量名
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* @param mixed $value 存储数据
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* @param integer $expire 有效时间（秒）
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* @return boolean
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*/
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public function set($name, $value,$expire=null) {
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$data = serialize($value);
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$name = $this->options['prefix'].addslashes($name);
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N('cache_write',1);
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if( C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
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//数据压缩
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$data = gzcompress($data,3);
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}
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if(C('DATA_CACHE_CHECK')) {//开启数据校验
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$crc = md5($data);
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}else {
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$crc = '';
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}
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if(is_null($expire)) {
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$expire = $this->options['expire'];
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}
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$expire = ($expire==0)?0: (time()+$expire) ;//缓存有效期为0表示永久缓存
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$result = $this->handler->query('select `cachekey` from `'.$this->options['table'].'` where `cachekey`=\''.$name.'\' limit 0,1');
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if(!empty($result) ) {
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//更新记录
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$result = $this->handler->execute('UPDATE '.$this->options['table'].' SET data=\''.$data.'\' ,datacrc=\''.$crc.'\',expire='.$expire.' WHERE `cachekey`=\''.$name.'\'');
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}else {
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//新增记录
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$result = $this->handler->execute('INSERT INTO '.$this->options['table'].' (`cachekey`,`data`,`datacrc`,`expire`) VALUES (\''.$name.'\',\''.$data.'\',\''.$crc.'\','.$expire.')');
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}
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if($result) {
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if($this->options['length']>0) {
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// 记录缓存队列
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$this->queue($name);
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}
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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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* 删除缓存
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* @access public
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* @param string $name 缓存变量名
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* @return boolean
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*/
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public function rm($name) {
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$name = $this->options['prefix'].addslashes($name);
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return $this->handler->execute('DELETE FROM `'.$this->options['table'].'` WHERE `cachekey`=\''.$name.'\'');
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}
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/**
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* 清除缓存
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* @access public
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* @return boolean
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*/
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public function clear() {
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return $this->handler->execute('TRUNCATE TABLE `'.$this->options['table'].'`');
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}
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}
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