memcached 和 mysql 主从环境下php开发代码详解_php技巧
$memcached = array( //用memcached 的 多 进程模拟 多台memcached 服务器 cn en 为 内存服务器名
'cn'=>array('192.168.254.144',11211),
'en'=>array('192.168.254.144',11212)
);
$mysql = array( // mysql 的主从 我的环境是 : xp 主 linux 从 mysql 5 php5
'master'=>array('192.168.254.213','root','1','mydz'),
'slave_1'=>array('192.168.254.144','root','1','mydz') //可以灵活添加多台从服务器
);
?>
服务器配置文件: 十分方便的 切换主从. 当主换了 从可以迅速切换为主. 支持 多从服务器 .
class Memcached
{
private $mem;
public $pflag=''; // memcached pconnect tag
private function memConnect($serkey){
require 'config.php';
$server = $memcached;
$this->mem = new Memcache;
$link = !$this->pflag ? 'connect' : 'pconnect' ;
$this->mem->$link($server[$serkey][0],$server[$serkey][1]) or $this->errordie('memcached connect error');
}
public function set($ser_key,$values,$flag='',$expire=''){
$this->memConnect($this->tag($ser_key));
if($this->mem->set($ser_key,$values,$flag,$expire)) return true;
else return false;
}
public function get($ser_key){
$this->memConnect($this->tag($ser_key));
if($var=$this->mem->get($ser_key)) return $var;
else return false;
}
private function tag($ser_key){
$tag=explode('_',$ser_key);
return $tag[0];
}
private function errordie($errmsg){
die($errmsg);
}
}
?>
简单的封装了 memcached 的操作. 详细的时间不多.我要离开公司了
在memcached 的多服务器上. 我的实现思路是这样的: 在把信息添加到 内存服务器的时候.我选择了手工设置添加到那个服务器.而不用传统的根据ID自动分配.
这样可以更灵活点.
以内存服务器名 为表示 比如 存 $arr 这个信息到 en 这台 内存服务器 我就这样写 $mem->set('en_'.$arr); 明白了吧
class Mysql
{
private $mysqlmaster;
private $myssqlslave;
private static $auid=0;
public function __construct(){
require 'config.php';
$msg = $mysql;
$this->mysqlmaster = new mysqli($msg['master'][0],$msg['master'][1],$msg['master'][2],$msg['master'][3]); //master mysql
$this->mysqlslave = $this->autotranscat($msg); // slave mysql
if(mysqli_connect_errno()){
printf("Connect failed: %s\n",mysqli_connect_error());
exit();
}
if(!$this->mysqlmaster->set_charset("latin1") && !$this->mysqlslave->set_charset("latin1")){
exit("set charset error");
}
}
private function autotranscat($mysql){
session_start();
$_SESSION['SID']!=0 || $_SESSION['SID']=0 ;
if($_SESSION['SID'] >=count($mysql)-1) $_SESSION['SID'] = 1;
else $_SESSION['SID']++;
$key = 'slave_'.$_SESSION['SID'];
echo($_SESSION['SID']);
return new mysqli($mysql[$key][0],$mysql[$key][1],$mysql[$key][2],$mysql[$key][3]);
}
public function mquery($sql){ //insert update
if(!$this->mysqlmaster->query($sql)){
return false;
}
}
public function squery($sql){
if($result=$this->mysqlslave->query($sql)){
return $result;
}else{
return false;
};
}
public function fetArray($sql){
if($result=$this->squery($sql)){
while($row=$result->fetch_array(MYSQLI_ASSOC)){
$resultraa[] = $row;
};
return $resultraa;
}
}
}
?>
这个是 mysqli 的封装. 也就是 读 从 写 主 的操作的封装.
require 'init.php';
$mem = new Memcached;
/* $mem->set('en_xx','bucuo');
echo($mem->get('en_xx'));
$mem->set('cn_jjyy','wokao');
echo($mem->get('cn_jjyy'));
*/
$sq = new Mysql;
$sql = "insert into mybb(pid) values(200)";
$mdsql = md5($sql);
if(!$result=$mem->get('cn_'.$mdsql)){
$sq->mquery("insert into mybb(pid) values(200)"); //插入到主mysql
$result = $sq->fetArray("select * from mybb"); //查询 是 从mysql
foreach($result as $var){
echo $var['pid'];
}
$mem->set('cn_'.$mdsql,$result); //添加到 名为 cn 的 memcached 服务器
}else{
foreach($result as $var){
echo $var['pid'];
}
}
?>

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