php无法操作php memcache操作类求助

来源：蜘蛛抓取(WebSpider) 时间：2016-06-01 03:01 标签： php memcache操作类
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Memcache 在PHP中的使用
add($key, $value, $expiry); $key: 唯一标识, 用于区分写入的数据 $value: 要写入的数据 $expiry: 过期时间, 默认为永远有效 用途: 将数据写入到memcache中 get($key) $key: 通过写入时的$key获取对应的数据 用途: 获取memcache中的数据 replace($key, $value, $expiry) 该方法参数与add方法的参数相同 用途也很明显就是替换数据 delete($key, $time = 0) $key: 唯一标识 $time: 延迟时间 用途: 删除memcache中存储的数据 下面来看看具体用法: add($key, $value, $expiry); $key: 唯一标识, 用于区分写入的数据 $value: 要写入的数据 $expiry: 过期时间, 默认为永远有效 用途: 将数据写入到memcache中 get($key) $key: 通过写入时的$key获取对应的数据 用途: 获取memcache中的数据 replace($key, $value, $expiry) 该方法参数与add方法的参数相同 用途也很明显就是替换数据 delete($key, $time = 0) $key: 唯一标识 $time: 延迟时间 用途: 删除memcache中存储的数据 下面来看看具体用法: 代码
代码如下: &?php $m = new Memcache(); $m-&connect('localhost', 11211); $data = 'content'; //需要缓存的数据 $m-&add('mykey', $data);echo $m-&get('mykey'); // 输出 content $m-&replace('mykey', 'data'); //替换内容为dataecho $m-&get('mykey');//输出 data $m-&delete('mykey'); //删除echo $m-&get('mykey'); //输出 false 因为已经删掉了哦.. ?&
是不是很简单.. 在实际应用中，通常会把数据库查询的结果集保存到 memcached 中 下次访问时直接从 memcached 中获取，而不再做数据库查询操作，这样可以在很大程度上减轻数据库的负担。 通常会将 SQL 语句 md5() 之后的值作为唯一标识符 key。下边是一个利用 memcached 来缓存数据库查询结果集的示例 代码
代码如下: &?php //连接memcache $m = new Memcache(); $m-&connect('localhost', 11211); //连接数据库的我就不写了. $sql = 'SELECT * FROM users'; $key = md5($sql); //md5 SQL命令 作为 memcache的唯一标识符 $rows = $m-&get($key); //先重memcache获取数据 if (!$rows) { //如果$rows为false那么就是没有数据咯, 那么就写入数据 $res = mysql_query($sql); $rows = array(); while ($row = mysql_fetch_array($res)) { $rows[] = $ } $m-&add($key, $rows); //这里写入重数据库中获取的数据, 可以设置缓存时间, 具体时间设置多少, 根据自己需求吧. } var_dump($rows); //打印出数据 //上面第一次运行程序时, 因为还没有缓存数据, 所以会读取一次数据库, 当再次访问程序时, 就直接重memcache获取了. ?&
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