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Signed-off-by: j502647092 <jtb1@163.com>
2025-11-24 21:26:09 +00:00 · 2015-11-01 22:25:03 +08:00
commit 2003fda7cb
409 changed files with 77938 additions and 0 deletions
--- a/ThinkPHP/Library/Think/Cache/Driver/Db.class.php
+++ b/ThinkPHP/Library/Think/Cache/Driver/Db.class.php
@@ -0,0 +1,138 @@
+<?php
+// +----------------------------------------------------------------------
+// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
+// +----------------------------------------------------------------------
+// | 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();
+/**
+ * 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`)
+ *    );
+ */
+class Db extends Cache {
+
+    /**
+     * 架构函数
+     * @param array $options 缓存参数
+     * @access public
+     */
+    public function __construct($options=array()) {
+        if(empty($options)) {
+            $options = array (
+                'table'     =>  C('DATA_CACHE_TABLE'),
+            );
+        }
+        $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');
+        $this->handler   = \Think\Db::getInstance();
+    }
+
+    /**
+     * 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);
+        N('cache_read',1);
+        $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   =  $result[0];
+            if(C('DATA_CACHE_CHECK')) {//开启数据校验
+                if($result['datacrc'] != md5($result['data'])) {//校验错误
+                    return false;
+                }
+            }
+            $content   =  $result['data'];
+            if(C('DATA_CACHE_COMPRESS') && 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 $expire  有效时间（秒）
+     * @return boolean
+     */
+    public function set($name, $value,$expire=null) {
+        $data   =  serialize($value);
+        $name   =  $this->options['prefix'].addslashes($name);
+        N('cache_write',1);
+        if( C('DATA_CACHE_COMPRESS') && function_exists('gzcompress')) {
+            //数据压缩
+            $data   =   gzcompress($data,3);
+        }
+        if(C('DATA_CACHE_CHECK')) {//开启数据校验
+            $crc  =  md5($data);
+        }else {
+            $crc  =  '';
+        }
+        if(is_null($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=\''.$data.'\' ,datacrc=\''.$crc.'\',expire='.$expire.' WHERE `cachekey`=\''.$name.'\'');
+        }else {
+        	//新增记录
+             $result  =  $this->handler->execute('INSERT INTO '.$this->options['table'].' (`cachekey`,`data`,`datacrc`,`expire`) VALUES (\''.$name.'\',\''.$data.'\',\''.$crc.'\','.$expire.')');
+        }
+        if($result) {
+            if($this->options['length']>0) {
+                // 记录缓存队列
+                $this->queue($name);
+            }
+            return true;
+        }else {
+            return false;
+        }
+    }
+
+    /**
+     * 删除缓存
+     * @access public
+     * @param string $name 缓存变量名
+     * @return boolean
+     */
+    public function rm($name) {
+        $name  =  $this->options['prefix'].addslashes($name);
+        return $this->handler->execute('DELETE FROM `'.$this->options['table'].'` WHERE `cachekey`=\''.$name.'\'');
+    }
+
+    /**
+     * 清除缓存
+     * @access public
+     * @return boolean
+     */
+    public function clear() {
+        return $this->handler->execute('TRUNCATE TABLE `'.$this->options['table'].'`');
+    }
+
+}