更新

2026-07-06 15:02:47 +08:00 · 2015-01-22 09:29:54 +08:00
parent 1df472b73e
commit b32d00b7f8
110 changed files with 20437 additions and 0 deletions
--- a/library/think/cache/driver/db.php
+++ b/library/think/cache/driver/db.php
@@ -0,0 +1,146 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkCache
+// +----------------------------------------------------------------------
+// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
+// +----------------------------------------------------------------------
+// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
+// +----------------------------------------------------------------------
+// | Author: liu21st <liu21st@gmail.com>
+// +----------------------------------------------------------------------
+
+namespace Think\Cache\Driver;
+
+/**
+ * 数据库方式缓存驱动
+ *    CREATE TABLE think_cache (
+ *      cachekey varchar(255) NOT NULL,
+ *      expire int(11) NOT NULL,
+ *      data blob,
+ *      datacrc int(32),
+ *      UNIQUE KEY `cachekey` (`cachekey`)
+ *    );
+ * @author    liu21st <liu21st@gmail.com>
+ */
+class Db {
+
+    protected $handler  =   null;
+    protected $options  =   [
+        'db'            =>  '',
+        'table'         =>  '',
+        'prefix'        =>  '',
+        'expire'        =>  0,
+        'length'        =>  0,
+    ];
+
+    /**
+     * 架构函数
+     * @param array $options 缓存参数
+     * @access public
+     */
+    public function __construct($options=[]) {
+        if(!empty($options)) {
+            $this->options      =   array_merge($this->options,$options);
+        }
+        $this->handler   = \Think\Db::instance();
+    }
+
+    /**
+     * 读取缓存
+     * @access public
+     * @param string $name 缓存变量名
+     * @return mixed
+     */
+    public function get($name) {
+        $name       =  $this->options['prefix'].addslashes($name);
+        $result     =  $this->handler->query('SELECT `data`,`datacrc` FROM `'.$this->options['table'].'` WHERE `cachekey`=\''.$name.'\' AND (`expire` =0 OR `expire`>'.time().') LIMIT 0,1');
+        if(false !== $result ) {
+            $result   =  $result[0];
+            $content   =  $result['data'];
+            if(function_exists('gzcompress')) {
+                //启用数据压缩
+                $content   =   gzuncompress($content);
+            }
+            $content    =   unserialize($content);
+            return $content;
+        }
+        else {
+            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) {
+        $data   =  serialize($value);
+        $name   =  $this->options['prefix'].addslashes($name);
+        if(function_exists('gzcompress')) {
+            //数据压缩
+            $data   =   gzcompress($data,3);
+        }
+        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
+        $result     =   $this->handler->query('select `cachekey` from `'.$this->options['table'].'` where `cachekey`=\''.$name.'\' limit 0,1');
+        if(!empty($result) ) {
+        	//更新记录
+            $result  =  $this->handler->execute('UPDATE '.$this->options['table'].' SET data=\''.$data.'\' ,expire='.$expire.' WHERE `cachekey`=\''.$name.'\'');
+        }else {
+        	//新增记录
+             $result  =  $this->handler->execute('INSERT INTO '.$this->options['table'].' (`cachekey`,`data`,`expire`) VALUES (\''.$name.'\',\''.$data.'\','.$expire.')');
+        }
+        if($result) {
+            if($this->options['length']>0) {
+                // 记录缓存队列
+                $result   =   $this->handler->query('SELECT `data`,`datacrc` FROM `'.$this->options['table'].'` WHERE `cachekey`=\'__info__\' AND `expire` =0 LIMIT 0,1');
+                $queue  =   xcache_get('__info__');
+                if(!$result) {
+                    $this->handler->execute('INSERT INTO '.$this->options['table'].' (`cachekey`,`data`,`expire`) VALUES (\'__info__\',\'\',0)');
+                    $queue  =   [];
+                }else{
+                    $queue   =  unserialize($result[0]['data']);
+                }
+                if(false===array_search($name, $queue))  array_push($queue,$name);
+                if(count($queue) > $this->options['length']) {
+                    // 出列
+                    $key =  array_shift($queue);
+                    // 删除缓存
+                    $this->handler->execute('DELETE FROM `'.$this->options['table'].'` WHERE `cachekey`=\''.$key.'\'');
+                }
+                $this->handler->execute('UPDATE '.$this->options['table'].' SET data=\''.serialize($queue).'\' ,expire=0 WHERE `cachekey`=\'__info__\'');
+                xcache_set('__info__', $queue);
+            }
+            return true;
+        }else {
+            return false;
+        }
+    }
+
+    /**
+     * 删除缓存
+     * @access public
+     * @param string $name 缓存变量名
+     * @return boolen
+     */
+    public function rm($name) {
+        $name  =  $this->options['prefix'].addslashes($name);
+        return $this->handler->execute('DELETE FROM `'.$this->options['table'].'` WHERE `cachekey`=\''.$name.'\'');
+    }
+
+    /**
+     * 清除缓存
+     * @access public
+     * @return boolen
+     */
+    public function clear() {
+        return $this->handler->execute('TRUNCATE TABLE `'.$this->options['table'].'`');
+    }
+
+}