Redis學習

最近在向node后臺開發看齊，所以了解了一些關于redis的知識，這里作為筆記

• 安裝redis

  使用home-brew

  brew install redis

成功的提示信息

To have launchd start redis at login: ln -sfv /usr/local/opt/redis/*.plist ~/Library/LaunchAgents Then to load redis now: launchctl load ~/Library/LaunchAgents/homebrew.mxcl.redis.plist Or, if you don’t want/need launchctl, you can just run: redis-server /usr/local/etc/redis.conf 復制代碼

使用cat命令查看配置信息

cat /usr/local/etc/redis.conf

其中指定了端口等信息

bind 127.0.0.1 ::1 bind 127.0.0.1 port 6379 tcp-backlog 511 timeout 0 tcp-keepalive 300 ... 復制代碼

• 啟動redis redis-server /usr/local/etc/redis.conf 終端輸出

9400:C 17 Sep 21:51:36.794 # oO0OoO0OoO0Oo Redis is starting oO0OoO0OoO0Oo9400:C 17 Sep 21:51:36.795 # Redis version=4.0.11, bits=64, commit=00000000, modified=0, pid=9400, just started9400:C 17 Sep 21:51:36.795 # Configuration loaded9400:M 17 Sep 21:51:36.796 * Increased maximum number of open files to 10032 (it was originally set to 7168)._.__.-``__ ''-.__.-`` `. `_. ''-._ Redis 4.0.11 (00000000/0) 64 bit.-`` .-```. ```\/ _.,_ ''-._( ' , .-` | `, ) Running in standalone mode|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379| `-._ `._ / _.-' | PID: 9400`-._ `-._ `-./ _.-' _.-'|`-._`-._ `-.__.-' _.-'_.-'|| `-._`-._ _.-'_.-' | http://redis.io`-._ `-._`-.__.-'_.-' _.-'|`-._`-._ `-.__.-' _.-'_.-'|| `-._`-._ _.-'_.-' |`-._ `-._`-.__.-'_.-' _.-'`-._ `-.__.-' _.-'`-._ _.-'`-.__.-'9400:M 17 Sep 21:51:36.799 # Server initialized9400:M 17 Sep 21:51:36.800 * DB loaded from disk: 0.001 seconds9400:M 17 Sep 21:51:36.800 * Ready to accept connections 復制代碼

這里可以看到redis啟動成功，監聽的端口是6379 新開一個tab窗口 輸入redis-cli ping 可以看到控制臺輸出PONG 這就說明redis啟動成功

• 關閉redis
  • 在啟動窗口按cmd+c或者直接關掉窗口結束進程
  • 執行redis-cli shutdown 輸出redis-cli ping檢驗 控制臺打印Could not connect to Redis at 127.0.0.1:6379: Connection refused 說明關閉成功

node端的簡單使用

• node安裝redis npm install redis --save

• 啟動redis客戶端

  const redis = require('redis'); // 你啟動的redis端口和ip地址+options（可去官網自行查閱資料） const client = redis.createClient(6379, '127.0.0.1', {}); // 監聽錯誤 client.on('error', (err) => {console.log(err); }) // 設置普通的string client.set("string key", "string val", redis.print); // 設置hash值 client.hset("hash key", "hashtest 1", "some value", redis.print); client.hset(["hash key", "hashtest 2", "some other value"], redis.print); // 設置map值 client.mset('key1', 'val1', ... 'keyn', 'valn', '[callback]'); //循環遍歷 client.hkeys("hash key", function (err, replies) {console.log(replies.length + " replies:");replies.forEach(function (reply, i) {console.log(" " + i + ": " + reply);});// 退出client.quit(); }); 復制代碼

  更多命令使用請參考:?github.com/NodeRedis/n…

• 漂流瓶小功能

  • throw方法

    exports.throw = (bottle, callback) => {bottle.time = bottle.time || Date.now();const bottleId = Math.random().toString(16);const type = {male: 0,female: 1};console.log('at redis.js:', bottle);/*client.SELECT選擇數據庫編號*/client.SELECT(type[bottle.type], function (event) {console.log(event);/*client.HMSET 保存哈希鍵值*/client.HMSET(bottleId, bottle, function (err, result) {if (err) {return callback({code: 0,msg: "過會兒再來試試吧！"});}console.log('at redis.js:', result);callback({code: 1,msg: result});/*設置過期時間為1天*/client.EXPIRE(bottleId, 86400);});});} 復制代碼

  • pick方法

    exports.pick = function (info, callback) {const type = {all: Math.round(Math.random()),male: 0,female: 1};console.log('info is:', info);info.type = info.type || 'all';client.SELECT(type[info.type], function () {/*隨機返回當前數據庫的一個鍵*/client.RANDOMKEY(function (err, bottleId) {if (!bottleId) {return callback({code: 0,msg: "大海空空如也..."});}/*根據key返回哈希對象*/client.HGETALL(bottleId, function (err, bottle) {if (err) {return callback({code: 0,msg: "漂流瓶破損了..."});}callback({code: 1,msg: bottle});/*根據key刪除鍵值*/client.DEL(bottleId);});});});} 復制代碼
    • app.js
    const redislib = require('./lib/redis');redislib.throw({type: 'male',}, res => {console.log(res);})redislib.pick({type: 'male',}, res => {console.log('at callback:', res);}); 復制代碼

    到這里已經跑通了程序，盡情享受redis吧～

    項目地址

轉載于:https://juejin.im/post/5b9fb826f265da0aa664b529

總結

以上是生活随笔為你收集整理的笔记：后端 - Redis的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。