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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
// $Id: CacheSqlite.class.php 2734 2012-02-14 06:55:15Z liu21st $
/**
+--------------------------------
* Sqlite缓存类
+--------------------------------
*/
class CacheSqlite extends Cache {
/**
+----------------------------------------------------------
* 架构函数
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
*/
public function __construct($options='') {
if ( !extension_loaded('sqlite') ) {
throw_exception(L('_NOT_SUPPERT_').':sqlite');
}
if(empty($options)){
$options= array (
'db' => ':memory:',
'table' => 'sharedmemory',
'expire' => C('DATA_CACHE_TIME'),
'persistent'=> false,
'length' =>0,
);
}
$this->options = $options;
$func = $this->options['persistent'] ? 'sqlite_popen' : 'sqlite_open';
$this->handler = $func($this->options['db']);
$this->connected = is_resource($this->handler);
}
/**
+----------------------------------------------------------
* 是否连接
+----------------------------------------------------------
* @access private
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
private function isConnected() {
return $this->connected;
}
/**
+----------------------------------------------------------
* 读取缓存
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @param string $name 缓存变量名
+----------------------------------------------------------
* @return mixed
+----------------------------------------------------------
*/
public function get($name) {
N('cache_read',1);
$name = sqlite_escape_string($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 $expire 有效时间（秒）
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function set($name, $value,$expire=null) {
N('cache_write',1);
$expire = !empty($expireTime)? $expireTime : C('DATA_CACHE_TIME');
$name = sqlite_escape_string($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 $name 缓存变量名
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function rm($name) {
$name = sqlite_escape_string($name);
$sql = 'DELETE FROM '.$this->options['table'].' WHERE var=\''.$name.'\'';
sqlite_query($this->handler, $sql);
return true;
}
/**
+----------------------------------------------------------
* 清除缓存
+----------------------------------------------------------
* @access public
+----------------------------------------------------------
* @return boolen
+----------------------------------------------------------
*/
public function clear() {
$sql = 'DELETE FROM '.$this->options['table'];
sqlite_query($this->handler, $sql);
return ;
}
}
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