PHP结合Redis+MySQL实现冷热数据交换应用案例详解

!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
head>
  meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
  title>Document/title>
/head>
script src="http://lib.sinaapp.com/js/jquery/1.9.1/jquery-1.9.1.min.js">/script>
body>
  p>span id="uid1">0/span>input type="button" value="用户1" onclick="vote(1);" />/p>
  p>span id="uid2">0/span>input type="button" value="用户2" onclick="vote(2);" />/p>
  p>span id="uid3">0/span>input type="button" value="用户3" onclick="vote(3);" />/p>
/body>
script>
  function vote(i){
    $.get('vote.php?uid='+i,function(rs){
      var span = '#uid'+i;
      $(span).html(rs);
    });
  }
/script>
/html>

?php
$redis = new Redis();
$redis->connect('localhost',6379);
//计算每个用户的总票数
$uid = intval($_GET['uid']);
//$uid = mt_rand(1,3);//随机指定投票人员，方便进行压力测试
echo $redis->incr($uid);
$voteid = $redis->incr('global_voteid');
$redis->set('vote:'.$voteid.':uid',$uid);
$ip = $_SERVER['REMOTE_ADDR'];
$redis->set('vote:'.$voteid.':ip',$ip);
$redis->set('vote:'.$voteid.':time',time());

?php
//连接数据库
$pdo = new PDO('mysql:host=localhost;dbname=test','root','1234');
$pdo->query('set names utf8');
//连接redis
$redis = new Redis();
$redis->connect('localhost',6379);
//永真循环
while(true){
  $vid = $redis->get('global_voteid');//自增长的主键
  $last = $redis->get('last');//最近一次插入mysql的投票主键
  //如果没有插入数据库，刚开始的肯定为true
  if(!$last){
    $last = 0;//设置为0
  }
  //如果所有的数据都被插入到MySQL中
  if($vid == $last){
    echo "wait\n";//输出等待
  }else{
    //进行插入到数据库操作
    $sql = 'insert into vote(vid,uid,ip,time) values';
    for($i = $vid;$i>$last;$i--){
      $k1 = 'vote:'.$i.':uid';
      $k2 = 'vote:'.$i.':ip';
      $k3 = 'vote:'.$i.':time';
      $row = $redis->mget([$k1,$k2,$k3]);
      $sql.="($i,$row[0],'$row[1]',$row[2]),";
            $redis->delete($k1,$k2,$k3);
    }
    $sql = substr($sql,0,-1);
    $pdo->exec($sql);
    $redis->set('last',$vid);//设置插入的主键位置
    echo 'OK';
  }
  sleep(5);//每隔5秒执行循环
}