基于.Net Core的Redis：基本数据类型及其应用场景与命令行操作

参考自：https://blog.csdn.net/only_yu_yy/article/details/78873735

https://blog.csdn.net/fenghuoliuxing990124/article/details/84983694

1、使用的Redis客户端为：ServiceStack.Redis
打开“程序包管理器控制台”，输入并执行“Install-Package ServiceStack.Redis”即可。

2、Redis基本数据类型：String
String类型是最常用的数据类型，在Redis中以KKey/Value存储。

using ServiceStack.Redis;
using System;
using System.Collections.Generic;
using System.Text;

namespace RedisDemo
{
    class StringDemo
    {
        public static void Start()
        {
            var redisMangement = new RedisManagerPool("127.0.0.1:6379");
            var client = redisMangement.GetClient();

            //---字符串---
            //set key value
            //summary: Set the string value of a key
            client.Set<int>("pwd", 111);
            //get key
            //summary: Get the value of a key
            int pwd = client.Get<int>("pwd");
            Console.WriteLine(pwd);

            //---对象---
            var todos = client.As<Todo>();
            Todo todo = new Todo
            {
                Id = todos.GetNextSequence(),
                Content = "String Demo",
                Order = 1
            };
            client.Set<Todo>("todo", todo);
            var getTodo = client.Get<Todo>("todo");
            Console.WriteLine(getTodo.Content);
        }
    }
}

String的应用场景

计数器：许多运用都会使用redis作为计数的基础工具，他可以实现快速计数、查询缓存的功能。

比如：优酷视频的播放：incr video:videoId:playTimes

或者：文章浏览量：incr article:aricleId:clickTimes

或者粉丝数量：取关 decr author:authorId:fansNumber

 3、Redis基本数据类型：Hash
Hash在Redis采用 (HashId,Key，Value)进行存储，一个HashId 可以包含多个key，一个key对应着一个value。

using ServiceStack.Redis;
using System;
using System.Collections.Generic;
using System.Text;

namespace RedisDemo
{
    class HashDemo
    {
        public static void Start()
        {
            var redisMangement = new RedisManagerPool("127.0.0.1:6379");
            var client = redisMangement.GetClient();

            //HSET key field value
            //summary: Set the string value of a hash field
            client.SetEntryInHash("test", "name", "ermao");
            client.SetEntryInHash("test", "age", "26");

            //---获取test哈希下的所有key---
            //HKEYS key
            //summary: Get all the fields in a hash
            List<string> hashKeys = client.GetHashKeys("test");
            Console.WriteLine("keys in test");
            foreach (var item in hashKeys)
            {
                Console.WriteLine(item);
            }

            //---获取test哈希下的所有值---
            //HVALS key
            //summary: Get all the values in a hash
            List<string> hashValues = client.GetHashValues("test");
            Console.WriteLine("values in test");
            foreach (var item in hashValues)
            {
                Console.WriteLine(item);
            }

            //---获取test哈希下，第一个Key对应的值---
            //HGET key field
            //summary: Get the value of a hash field
            string value = client.GetValueFromHash("test", hashKeys[0]);
            Console.WriteLine($"test下的key{hashKeys[0]}对应的值{value}");
        }
    }
}

Hash的应用场景

商品详情页

4、Redis基本数据类型：List
list是一个链表结构，key可以理解为链表的名字，然后往这个名字所对应的链表里加值。，list可以以队列 / 栈的形式进行工作。

using ServiceStack.Redis;
using System;
using System.Collections.Generic;
using System.Text;

namespace RedisDemo
{
    class ListDemo
    {
        public static void Start()
        {
            var redisMangement = new RedisManagerPool("127.0.0.1:6379");
            var client = redisMangement.GetClient();

            //---队列的使用（先进先出）---
            client.EnqueueItemOnList("name", "zhangsan");
            client.EnqueueItemOnList("name", "lisi");
            long count = client.GetListCount("name");
            for (int i = 0; i < count; i++)
            {
                Console.WriteLine(client.DequeueItemFromList("name"));
            }

            //---栈的使用（先进后出）---
            client.PushItemToList("course", "Math");
            client.PushItemToList("course", "English");
            long count2 = client.GetListCount("course");
            for (int i = 0; i < count2; i++)
            {
                Console.WriteLine(client.PopItemFromList("course"));
            }
        }
    }
}

List的应用场景

点赞：
创建一条微博内容：set user:1:post:91 “hello redis”;
点赞：
lpush post:91:good “kobe.png”
lpush post:91:good “jordan.png”
lpush post:91:good “James.png”
查看有多少人点赞：llen post:91:good
查看有哪些人点赞：lrange post:91:good 0 -1

 5、Redis基本数据类型：Set
它是去重、无序集合。set是通过hash table实现的，添加，删除和查找,对集合我们可以取并集，交集，差集。

using ServiceStack.Redis;
using System;
using System.Collections.Generic;
using System.Text;

namespace RedisDemo
{
    class SetDemo
    {
        public static void Start()
        {
            var redisMangement = new RedisManagerPool("127.0.0.1:6379");
            var client = redisMangement.GetClient();

            //SADD key member [member ...]
            //summary: Add one or more members to a set
            client.AddItemToSet("s1", "abc");
            client.AddItemToSet("s1", "qwer");
            client.AddItemToSet("s1", "asdf");
            client.AddItemToSet("s1", "hjkl");
            client.AddItemToSet("s1", "zxc");
            //SMEMBERS key
            //summary: Get all the members in a set
            HashSet<string> hashSet = client.GetAllItemsFromSet("s1");
            foreach (var item in hashSet)
            {
                Console.WriteLine(item);
            }

            client.AddItemToSet("s2", "qwer");
            client.AddItemToSet("s2", "wasd");

            //SUNION key [key ...]
            //summary: Add multiple sets
            HashSet<string> hashSetUnion = client.GetUnionFromSets(new string[] { "s1", "s2" });
            Console.WriteLine("---并集---");
            foreach (var item in hashSetUnion)
            {
                Console.WriteLine(item);
            }

            //SINTER key [key ...]
            //summary: Intersect multiple sets
            HashSet<string> hashSetInter = client.GetIntersectFromSets(new string[] { "s1", "s2" });
            Console.WriteLine("---交集---");
            foreach (var item in hashSetInter)
            {
                Console.WriteLine(item);
            }

            //SDIFF key [key ...]
            //summary: Subtract multiple sets
            HashSet<string> hashSetDifference = client.GetDifferencesFromSet("s1", new string[] { "s2" });
            Console.WriteLine("---差集---");
            foreach (var item in hashSetDifference)
            {
                Console.WriteLine(item);
            }
        }
    }
}

Set的应用场景

随机事件（如：抽奖）、共同好友、推荐好友等

6、Redis基本数据类型：SortedSet
set是一种非常方便的结构，但是数据无序，redis提供了一个sorted set，每一个添加的值都有一个对应的分数，放进去的值按照该分数升序存在一个集合中，可以通过这个分数进行相关排序的操作。

using ServiceStack.Redis;
using System;
using System.Collections.Generic;
using System.Text;

namespace RedisDemo
{
    class SortedSetDemo
    {
        public static void Start()
        {
            var redisMangement = new RedisManagerPool("127.0.0.1:6379");
            var client = redisMangement.GetClient();

            //ZADD key [NX|XX] [CH] [INCR] score member [score member ...]
            //summary: Add one or more members to a sorted set, or update its score if it already exists
            client.AddItemToSortedSet("grade", "Chinese", 82);
            client.AddItemToSortedSet("grade", "Math", 96);
            client.AddItemToSortedSet("grade", "English", 91);
            client.AddItemToSortedSet("grade", "History", 97);
            //ZREVRANGE key start stop [WITHSCORES]
            //summary: Return a range of members in a sorted set, by index, with scores ordered from high to low
            List<string> sortedList = client.GetAllItemsFromSortedSetDesc("grade");
            foreach (var item in sortedList)
            {
                Console.WriteLine(item);
            }
        }
    }
}

SortedSet的应用场景

排行榜（如：微博热搜排行榜）