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采用memcache与数据库连接查询的方式进行数据缓存目前是采用单个的memcache服务器，以后会添加多个的

<?php

/**

* @author

* @name data link class and memcache class

* //使用memcache的查询结果

* 传送sql语句，返回是查询后的数组，数组有可能为空

* $dataArrayName = $db->get_Date($sql);

* 如果查询的是单条数据，则要进行输出时采用

* $dataArrayName[0]['字段名']的格式

*/

class Datelink

{

private $DateServer = "localhost";//mysql数据库地址

private $DateBase = "basename";//mysql中的数据库

private $DateUser = "username";//mysql数据库连接帐号

private $Datepwd = "userpwd";//mysql数据库连接密码

private $dbLink;//连接对象

private $result;//数据查询结果

private $insert_id;//定义插入序号

private $affected_rows;//定义影响行数

static $data_obj;

private $mem_obj;

#采用单例模式,实例化时进行数据库连接

function __construct(){

$this->dbLink=@mysql_connect($this->DateServer,$this->DateUser,$this->Datepwd)or die(mysql_error());

if(!$this->dbLink)$this->dbhalt("exsiting error when connecting!");

if(!@mysql_select_db($this->DateBase,$this->dbLink))$this->dbhalt("can't use this database,please check database!");

mysql_query("set names utf-8",$this->dbLink);//如果是utf-8可以改为utf-8

$this->mem_obj = Mem::__GetObj();

}

private function __clone(){}

static function contect_data(){

if(!self::$data_obj instanceof self){

self::$data_obj = new self();

}

return self::$data_obj;

}

function __set($name,$value){//设置属性

$this->$name=$value;

}

function __get($name){//获取属性

return $this->$name;

}

function dbhalt($errmsg){//错误反馈

die($errmsg);

}

function get_Date($sql){//仅针对select 查询进行缓存

if(preg_match("/^select/i",$sql)){//如果是select这里增加memcache内容的判断

if($this->mem_obj->cache_Obj){//进行mem 查询看是否存在缓存

if($temp=$this->mem_obj->get($sql)){

$this->result=$temp;

return $temp;

}else{

$this->execute($sql);

$rows = $this->num_rows();

$temp = array();

for ($i=0;$i<$rows;$i++) {

$fields = mysql_num_fields($this->result);

$row = mysql_fetch_array($this->result);

for ($j=0;$j<$fields;$j++) {

if ($i == 0) {

$columns[$j] = mysql_field_name($this->result,$j);

}

$temp[$i][$columns[$j]] = $row[$j];

}

}

//$temp = $this->fetch_array();

$this->mem_obj->set($sql,$temp);

return $temp;

}

}//如果不是select 或者没有memcache

}

//如果以上没有进行 memcache的查询，则进行普通查询并返回

$this->execute($sql);

$rows = $this->num_rows();

$temp = array();

for ($i=0;$i<$rows;$i++) {

$fields = mysql_num_fields($this->result);

$row = mysql_fetch_array($this->result);

for ($j=0;$j<$fields;$j++) {

if ($i == 0) {

$columns[$j] = mysql_field_name($this->result,$j);

}

$temp[$i][$columns[$j]] = $row[$j];

}

}

return $temp;

}

function fetch_array(){

return mysql_fetch_array($this->result);

}

function execute($sql){//执行sql

$this->result = mysql_query($sql,$this->dbLink);

}

function num_rows(){//返回行数,参数记录集

return mysql_num_rows($this->result);

}

function get_rows($sql){//返回行数,参数为sql

$this->execute($sql);

return $this->num_rows($this->result);

}

function insert($sql){//插入sql-有自动增长序号,返回新建序号

$this->execute($sql);

$this->insert_id = mysql_insert_id($this->dbLink);

$this->free_result($this->result);

return $this->insert_id;

}

function insert_($sql){//插入sql-没有自动增长序号,返回影响行数

$this->execute($sql);

$this->affected_rows = mysql_affected_rows($this->dbLink);

$this->free_result($this->result);

return $this->affected_rows;

}

function update($sql){//更新sql

$this->execute($sql);

$this->affected_rows=mysql_affected_rows($this->dbLink);

$this->free_result($this->result);

return $this->affected_rows;

}

function del($sql){//删除sql

$this->execute($sql);

$this->affected_rows=mysql_affected_rows($this->dbLink);

$this->free_result($this->result);

return $this->affected_rows;

}

function free_result(){//释放记录集

@mysql_free_result($this->result);

}

function close(){//关闭当前数据库

@mysql_close($this->dbLink);

}

}//结束class的括号

class Mem{//memcache设置

private $server_ip="";

private $server_port="11211";//默认端口

static $mem_Obj;

public $cache_Obj;

function __construct(){

if($this->cache_Obj=@new Memcache){

if(!@$this->cache_Obj->connect($this->server_ip,$this->server_port))$this->cache_Obj=false; }

}

private function __clone(){}

static function __GetObj(){

if(!self::$mem_Obj instanceof self)self::$mem_Obj = new self;

return self::$mem_Obj;

}

public function set($sql,$tempSource){//设置cache

return $this->cache_Obj->set(md5($sql),$tempSource);

}

public function add($sql,$tmpSource){//add添加cache，如果存在则删除后添加

if($this->get($sql))$this->del($sql);

return $this->set($sql,$tmpSource);

}

public function get($sql){//获取cache

if($temp=$this->cache_Obj->get(md5($sql))){

return $temp;

}

return false;

}

public function del($sql){//删除某个数据

return $this->cache_Obj->delete(md5($sql));

}

public function delAll(){//让所有cache失效，并不清空，会有新数据取代

return $this->cache_Obj->flush();

}

}

$db=Datelink::contect_data(); //这里是调用数据库连接

// $db->mem_obj->delAll();//这里可以其清除全部缓存

?>

Memcache与mysql配合查询，进行数据缓存

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