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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2014 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Think\Cache\Driver;
use Think\Cache;
defined('THINK_PATH') or exit();
/**
* Sqlite缓存驱动
*/
class Sqlite extends Cache {
/**
* 架构函数
* @param array $options 缓存参数
* @access public
*/
public function __construct($options=array()) {
if ( !extension_loaded('sqlite') ) {
E(L('_NOT_SUPPORT_').':sqlite');
}
if(empty($options)) {
$options = array (
'db' => ':memory:',
'table' => 'sharedmemory',
);
}
$this->options = $options;
$this->options['prefix'] = isset($options['prefix'])? $options['prefix'] : C('DATA_CACHE_PREFIX');
$this->options['length'] = isset($options['length'])? $options['length'] : 0;
$this->options['expire'] = isset($options['expire'])? $options['expire'] : C('DATA_CACHE_TIME');
$func = $this->options['persistent'] ? 'sqlite_popen' : 'sqlite_open';
$this->handler = $func($this->options['db']);
}
/**
* 读取缓存
* @access public
* @param string $name 缓存变量名
* @return mixed
*/
public function get($name) {
N('cache_read',1);
$name = $this->options['prefix'].sqlite_escape_string($name);
$sql = 'SELECT value FROM '.$this->options['table'].' WHERE var=\''.$name.'\' AND (expire=0 OR expire >'.time().') LIMIT 1';
$result = sqlite_query($this->handler, $sql);
if (sqlite_num_rows($result)) {
$content = sqlite_fetch_single($result);
if(C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
//启用数据压缩
$content = gzuncompress($content);
}
return unserialize($content);
}
return false;
}
/**
* 写入缓存
* @access public
* @param string $name 缓存变量名
* @param mixed $value 存储数据
* @param integer $expire 有效时间（秒）
* @return boolean
*/
public function set($name, $value,$expire=null) {
N('cache_write',1);
$name = $this->options['prefix'].sqlite_escape_string($name);
$value = sqlite_escape_string(serialize($value));
if(is_null($expire)) {
$expire = $this->options['expire'];
}
$expire = ($expire==0)?0: (time()+$expire) ;//缓存有效期为0表示永久缓存
if( C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
//数据压缩
$value = gzcompress($value,3);
}
$sql = 'REPLACE INTO '.$this->options['table'].' (var, value,expire) VALUES (\''.$name.'\', \''.$value.'\', \''.$expire.'\')';
if(sqlite_query($this->handler, $sql)){
if($this->options['length']>0) {
// 记录缓存队列
$this->queue($name);
}
return true;
}
return false;
}
/**
* 删除缓存
* @access public
* @param string $name 缓存变量名
* @return boolean
*/
public function rm($name) {
$name = $this->options['prefix'].sqlite_escape_string($name);
$sql = 'DELETE FROM '.$this->options['table'].' WHERE var=\''.$name.'\'';
sqlite_query($this->handler, $sql);
return true;
}
/**
* 清除缓存
* @access public
* @return boolean
*/
public function clear() {
$sql = 'DELETE FROM '.$this->options['table'];
sqlite_query($this->handler, $sql);
return ;
}
}