其实redis的事务是个假事务,没有实现原子性,
若要php支持事务,必须一起执行,其中incr会报错
$status = $redis->multi()->lPush($key1, '1123')->lPush($key2, '2123')->incr("age","age")->exec();
try {
$redis = new Redis();
$redis->connect('192.168.75.132', 6379);
//开启事务
$redis->multi();
$redis->setex('keyTest', 60, 1);
$redis->get('keyTest');
$redis->incr('keyTest');
$redis->get('keyTest');
//执行事务
$ret = $redis->exec();
print_r($ret);
} catch (Exception $e){
echo $e->getMessage();
}
//输出
Array
(
[0] => 1
[1] => 1
[2] => 2
[3] => 2
)
取消事务
try {
$redis = new Redis();
$redis->connect('192.168.75.132', 6379);
//先设置缓存keyTest为1
$redis->setex('keyTest', 60, 1);
//开启事务
$redis->multi();
$redis->setex('keyTest', 60, 10);
$redis->get('keyTest');
$redis->incr('keyTest');
$redis->get('keyTest');
//取消事务
$redis->discard();
$ret = $redis->get('keyTest');
var_dump($ret);
//查看keyTest
} catch (Exception $e){
echo $e->getMessage();
}
//输出
string(1) "1"
监视键,并执行事务
try {
$redis = new Redis();
$redis->connect('192.168.75.132', 6379);
//先设置缓存keyTest为1
$redis->setex('keyTest', 60, 1);
//监视keyTest
$redis->watch(array('keyTest'));
//假设在开始监视之后,执行事务之前,keyTest被并发操作redis的其他用户修改了
$redis->setex('keyTest', 60, 10);
//开启事务
$redis->multi();
$redis->incr('keyTest');
//执行事务
$ret = $redis->exec();
var_dump($ret);
$ret = $redis->get('keyTest');
var_dump($ret);
//查看keyTest
} catch (Exception $e){
echo $e->getMessage();
}
//输出
bool(false)
string(2) "10"
redis抢购
<?php
header("content-type:text/html;charset=utf-8");
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
$redis->watch("mywatchlist");
$len = $redis->hlen("mywatchlist");
$rob_total = 100; //抢购数量
if ($len < $rob_total) {
$redis->multi();
$redis->hSet("mywatchlist", "user_id_" . mt_rand(1, 999999), time());
$rob_result = $redis->exec();
//file_put_contents("log.txt", $len . PHP_EOL, FILE_APPEND);
if ($rob_result) {
$mywatchlist = $redis->hGetAll("mywatchlist");
echo '抢购成功' . PHP_EOL;
echo '剩余数量:' . ($rob_total - $len - 1) . PHP_EOL;
echo '用户列表:' . PHP_EOL;
print_r($mywatchlist);
exit;
} else {
exit('手气不好,再抢购!');
}
} else {
exit('已卖光');
}
标签:事务,get,Redis,redis,ret,echo,keyTest
From: https://www.cnblogs.com/qcy-blog/p/17932075.html