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Yii2-Redis使用初记

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Jun 13, 2016 pm 12:23 PM

cache gt redis yii

Yii2-Redis使用小记

前些天简单学习了下 Redis，现在准备在项目上使用它了。我们目前用的是 Yii2 框架，在官网搜索了下 Redis，就发现了yii2-redis这扩展。

安装后使用超简单，打开 common/config/main.php 文件，修改如下。

1	`'cache'` `=> [` `// 'class' => 'yii\caching\FileCache', 'class' => 'yii\redis\Cache',],'redis' => [ 'class' => 'yii\redis\Connection', 'hostname' => 'localhost', 'port' => 6379, 'database' => 0,],`

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OK，现在已经用 redis 接管了yii的缓存，缓存的使用和以前一样，以前怎么用现在还是怎么用，但是有个不算bug的bug，所以算小坑，等会会说。

来测试下 cache 先，

1	`Yii::$app->cache->set('test',` `'hehe..');echo` `Yii::$app->cache->get('test'),` `"\n";Yii::$app->cache->set('test1',` `'haha..', 5);echo` `'1 ', Yii::$app->cache->get('test1'),` `"\n";sleep(6);echo` `'2 ', Yii::$app->cache->get('test1'),` `"\n";`

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来看下测试结果。

和原来一样的用法，没问题。。

但是刚才我说过了有个不算bug的bug，所以算小坑，到底是什么东西呢？
如果你直接用 redis 接管了 cache，如果正常使用是完全没问题的，但是当过期时间的值超过 int 范围的时候，redis就会报错。
我使用了 yii2-admin，凑巧让我踩到坑了，因为他缓存了30天，也就是2592000秒，并且 redis 缓存时间精度默认用毫秒，所以时间就是 2592000000 毫秒。
而 redis 的过期时间只能是int类型，Cache.php 里的 php 强制转为int，而没有做其他处理，所以就会变成 -1702967296 然后就报错了。

但是直接在 redis 命令行下不会负数，如图。

不过没关系，修复起来也很简单，我们修改为秒即可。
打开 vendor/yiisoft/yii2-redis/Cache.php 第 133 行，修改为如下代码。

protected function setValue($key, $value, $expire){ if ($expire == 0) { return (bool) $this->redis->executeCommand('SET', [$key, $value]); } else { // $expire = (int) ($expire * 1000); // 单位默认为毫秒 // return (bool) $this->redis->executeCommand('SET', [$key, $value, 'PX', $expire]); $expire = +$expire > 0 ? $expire : 0; // 防止负数 return (bool) $this->redis->executeCommand('SET', [$key, $value, 'EX', $expire]); // 按秒缓存 }}

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这样就OK了。

好了，今天分享这些，明后天会说下 yii2-redis 的 Connection 和 ActiveRecord 以及小坑。

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