使用Mysql和Redis设计抢购逻辑

CREATE TABLE `la_store` (
  `id` int(11) NOT NULL,
  `val` int(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

<?php
$stime=microtime(true);
$count=100000;//测试次数
while($count>0){
$count-=1;
$con = mysql_connect("localhost","user","pwd");
if (!$con)
  {
  die(‘Could not connect: ‘ . mysql_error());
  }
mysql_select_db("database_name", $con);
mysql_query(‘begin‘);
$record=mysql_query("select * from la_store where id = 1 for update");//获取独占锁
$record=mysql_fetch_array($record);
if($record[‘val‘]>0){//判断是否还有库存
//有库存的逻辑
$res=mysql_query("UPDATE la_test SET val = val-1 WHERE id=1 ");//更新库存
}else{
//没库存的逻辑
}
mysql_query("commit");
mysql_close($con);
}
$etime=microtime(true);//获取程序执行结束的时间
$total=$etime-$stime;
echo $total;

<?php
$stime=microtime(true);//开始时间
$count=100000;//测试次数
while($count>0){
$count-=1;
$redis = new Redis();
   $redis->connect(‘127.0.0.1‘, 6379);
$res=$redis->multi()->decr(‘store‘)->get(‘store‘)->exec();
if($res[1]>0){
        //有库存逻辑
}else{
        //没有库存逻辑
}
}
$etime=microtime(true);//获取程序执行结束的时间
print_r($res);
$total=$etime-$stime;
echo $total;