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120 lines
4.2 KiB
PHP
120 lines
4.2 KiB
PHP
<?php
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// +----------------------------------------------------------------------
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// | ThinkPHP [ WE CAN DO IT JUST THINK ]
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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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* Sqlite缓存驱动
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*/
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class Sqlite 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 ( !extension_loaded('sqlite') ) {
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E(L('_NOT_SUPPORT_').':sqlite');
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}
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if(empty($options)) {
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$options = array (
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'db' => ':memory:',
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'table' => 'sharedmemory',
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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'])? $options['expire'] : C('DATA_CACHE_TIME');
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$func = $this->options['persistent'] ? 'sqlite_popen' : 'sqlite_open';
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$this->handler = $func($this->options['db']);
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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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N('cache_read',1);
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$name = $this->options['prefix'].sqlite_escape_string($name);
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$sql = 'SELECT value FROM '.$this->options['table'].' WHERE var=\''.$name.'\' AND (expire=0 OR expire >'.time().') LIMIT 1';
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$result = sqlite_query($this->handler, $sql);
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if (sqlite_num_rows($result)) {
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$content = sqlite_fetch_single($result);
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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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return unserialize($content);
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}
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return false;
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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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N('cache_write',1);
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$name = $this->options['prefix'].sqlite_escape_string($name);
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$value = sqlite_escape_string(serialize($value));
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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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if( C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
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//数据压缩
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$value = gzcompress($value,3);
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}
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$sql = 'REPLACE INTO '.$this->options['table'].' (var, value,expire) VALUES (\''.$name.'\', \''.$value.'\', \''.$expire.'\')';
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if(sqlite_query($this->handler, $sql)){
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if($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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}
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return false;
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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 = $this->options['prefix'].sqlite_escape_string($name);
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$sql = 'DELETE FROM '.$this->options['table'].' WHERE var=\''.$name.'\'';
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sqlite_query($this->handler, $sql);
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return true;
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}
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/**
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* 清除缓存
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* @access public
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* @return boolean
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*/
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public function clear() {
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$sql = 'DELETE FROM '.$this->options['table'];
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sqlite_query($this->handler, $sql);
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return ;
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}
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}
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