Redis 学习笔记八 NodeJs使用Redis

npm install redis

官网：
https://github.com/NodeRedis/node_redis

代码：

连接

var redis = require("redis");
var client = redis.createClient(6379,'192.10.200.105',{connect_timeout:1});

client.info(function(err,response){
        console.log(err,response);
});
client.on('error',function(error){
        console.log(error);
});

multi

在遇到exec()之前都不会运行里面的程序。在exec()时，上面代码会按队列执行。

// multi chain with an individual callback
client.multi()
.scard("bigset")
.smembers("bigset")
.keys("*", function (err, replies) {
        // NOTE: code in this callback is NOT atomic
        // this only happens after the the .exec call finishes.
        client.mget(replies, redis.print);
    })
.dbsize()
.exec(function (err, replies) {
        console.log("MULTI got " + replies.length + " replies");
        replies.forEach(function (reply, index) {
            console.log("Reply " + index + ": " + reply.toString());
        });
    });

redis.print()

测试时使用的一个回调函数

var redis = require("redis"),
    client = redis.createClient();

client.on("connect", function () {
    client.set("foo_rand000000000000", "some fantastic value", redis.print);
    client.get("foo_rand000000000000", redis.print);
});

mget

var client = require("redis").createClient();

client.mget(["sessions started", "sessions started", "foo"], function (err, res) {
    console.dir(res);
});

键值是否存在

client.exists('key', function(err, reply) {
if (reply === 1) {
 console.log('exists');
 } else {
 console.log('doesn\'t exist');
 }
});