php memcached mysql開發詳細實例

2024-05-04 21:49:01

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Memcached的工作方式:以下的部分中,讀者最好能準備一份memcached的源代碼.

Memcached是傳統的網絡服務程序,如果啟動的時候使用了-d參數,它會以守護進程的方式執行,創建守護進程由daemon.c完成,這個程序只有一個daemon函數,這個函數很簡單,如無特殊說明,代碼以1.2.1為準,代碼如下:

#include <fcntl.h>

#include <stdlib.h>

#include <unistd.h>

int

daemon(nochdir, noclose)

    int nochdir, noclose;

{

    int fd;

    switch (fork()) {

    case -1:

        return (-1);

    case 0:

        break;

    default:

        _exit(0);

    }

    if (setsid() == -1)

        return (-1);

    if (!nochdir)

        (void)chdir(”/”);

    if (!noclose && (fd = open(”/dev/null”, O_RDWR, 0)) != -1) {

        (void)dup2(fd, STDIN_FILENO);

        (void)dup2(fd, STDOUT_FILENO);

        (void)dup2(fd, STDERR_FILENO);

        if (fd > STDERR_FILENO)

            (void)close(fd);

    }

    return (0);

}

這個函數 fork 了整個進程之后,父進程就退出,接著重新定位 STDIN 、 STDOUT 、 STDERR 到空設備,daemon 就建立成功了,代碼如下:

<?php

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);

}

}

?>

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 ",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;

}

}

}

?>

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"); //查詢是從mysql

foreach($result as $var){

echo $var['pid'];

}

$mem->set('cn_'.$mdsql,$result); //添加到名為 cn 的 memcached 服務器

}else{

foreach($result as $var){

echo $var['pid'];

}

}

?>

<?php

$memcached = array( //用memcached 的多進程模擬多臺memcached 服務器 cn en 為內存服務器名

'cn'=>array('192.168.254.144',11211),

'en'=>array('192.168.254.144',11212)

); //開源代碼Vevb.com

$mysql = array( // mysql 的主從我的環境是： xp 主 linux 從 mysql 5 php5

'master'=>array('192.168.254.213','root','1','mydz'),

'slave_1'=>array('192.168.254.144','root','1','mydz') //可以靈活添加多臺從服務器

);

?>