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                # Redis實戰源碼之Hash使用實例 > 在實際應用中,Hash不單單就是存儲數據表,我通過實例介紹一下Hash強悍的功能 ## 使用Hash存儲在線會員 如果你開發過聊天室,游戲項目等時候,你會碰到顯示當前所有在線會員 顯示在線會員肯定會容易,那么我們還要同時顯示這些會員的性別,姓名,等級,地區等信息呢, 當然,我們想要都能從數據庫讀出來,最多犧牲一些性能. 這時候我們使用Hash,同樣能解決這個問題 * 我們先定義一個online表 ~~~ $online =RedisHash::instance()->setTable("online")->setKey("room1"); ~~~ 或者 ~~~ $online =RedisHash::instance()->setHashKey("online:room1"); ~~~ * 登記上線信息時候 這樣這個 當一個會員上線是 ~~~ $guid = "PU592FB8F95842F575356"; $online->set($guid,serialize(PersonnelUser::quickGet("$guid"))) ~~~ 顯示所有在線會員 ~~~ $online->get() ~~~ dump后的結果如下: ![](https://box.kancloud.cn/05bb9cc97102d242ecaa0c3282025cb1_1147x66.png) * 剔除上線信息 ~~~ $guid = "PU592FB8F95842F575356"; $online->delete($guid) ~~~
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