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。

 1 using ServiceStack.Redis;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.Text;
 5 
 6 namespace RedisDemo
 7 {
 8     class StringDemo
 9     {
10         public static void Start()
11         {
12             var redisMangement = new RedisManagerPool("127.0.0.1:6379");
13             var client = redisMangement.GetClient();
14 
15             //---字符串---
16             //set key value
17             //summary: Set the string value of a key
18             client.Set<int>("pwd", 111);
19             //get key
20             //summary: Get the value of a key
21             int pwd = client.Get<int>("pwd");
22             Console.WriteLine(pwd);
23 
24             //---对象---
25             var todos = client.As();
26             Todo todo = new Todo
27             {
28                 Id = todos.GetNextSequence(),
29                 Content = "String Demo",
30                 Order = 1
31             };
32             client.Set("todo", todo);
33             var getTodo = client.Get("todo");
34             Console.WriteLine(getTodo.Content);
35         }
36     }
37 }

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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。

 1 using ServiceStack.Redis;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.Text;
 5 
 6 namespace RedisDemo
 7 {
 8     class HashDemo
 9     {
10         public static void Start()
11         {
12             var redisMangement = new RedisManagerPool("127.0.0.1:6379");
13             var client = redisMangement.GetClient();
14 
15             //HSET key field value
16             //summary: Set the string value of a hash field
17             client.SetEntryInHash("test", "name", "ermao");
18             client.SetEntryInHash("test", "age", "26");
19 
20             //---获取test哈希下的所有key---
21             //HKEYS key
22             //summary: Get all the fields in a hash
23             List<string> hashKeys = client.GetHashKeys("test");
24             Console.WriteLine("keys in test");
25             foreach (var item in hashKeys)
26             {
27                 Console.WriteLine(item);
28             }
29 
30             //---获取test哈希下的所有值---
31             //HVALS key
32             //summary: Get all the values in a hash
33             List<string> hashValues = client.GetHashValues("test");
34             Console.WriteLine("values in test");
35             foreach (var item in hashValues)
36             {
37                 Console.WriteLine(item);
38             }
39 
40             //---获取test哈希下，第一个Key对应的值---
41             //HGET key field
42             //summary: Get the value of a hash field
43             string value = client.GetValueFromHash("test", hashKeys[0]);
44             Console.WriteLine($"test下的key{hashKeys[0]}对应的值{value}");
45         }
46     }
47 }

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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。

 1 using ServiceStack.Redis;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.Text;
 5 
 6 namespace RedisDemo
 7 {
 8     class ListDemo
 9     {
10         public static void Start()
11         {
12             var redisMangement = new RedisManagerPool("127.0.0.1:6379");
13             var client = redisMangement.GetClient();
14 
15             //---队列的使用（先进先出）---
16             client.EnqueueItemOnList("name", "zhangsan");
17             client.EnqueueItemOnList("name", "lisi");
18             long count = client.GetListCount("name");
19             for (int i = 0; i < count; i++)
20             {
21                 Console.WriteLine(client.DequeueItemFromList("name"));
22             }
23 
24             //---栈的使用（先进后出）---
25             client.PushItemToList("course", "Math");
26             client.PushItemToList("course", "English");
27             long count2 = client.GetListCount("course");
28             for (int i = 0; i < count2; i++)
29             {
30                 Console.WriteLine(client.PopItemFromList("course"));
31             }
32         }
33     }
34 }

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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。

 1 using ServiceStack.Redis;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.Text;
 5 
 6 namespace RedisDemo
 7 {
 8     class SetDemo
 9     {
10         public static void Start()
11         {
12             var redisMangement = new RedisManagerPool("127.0.0.1:6379");
13             var client = redisMangement.GetClient();
14 
15             //SADD key member [member ...]
16             //summary: Add one or more members to a set
17             client.AddItemToSet("s1", "abc");
18             client.AddItemToSet("s1", "qwer");
19             client.AddItemToSet("s1", "asdf");
20             client.AddItemToSet("s1", "hjkl");
21             client.AddItemToSet("s1", "zxc");
22             //SMEMBERS key
23             //summary: Get all the members in a set
24             HashSet<string> hashSet = client.GetAllItemsFromSet("s1");
25             foreach (var item in hashSet)
26             {
27                 Console.WriteLine(item);
28             }
29 
30             client.AddItemToSet("s2", "qwer");
31             client.AddItemToSet("s2", "wasd");
32 
33             //SUNION key [key ...]
34             //summary: Add multiple sets
35             HashSet<string> hashSetUnion = client.GetUnionFromSets(new string[] { "s1", "s2" });
36             Console.WriteLine("---并集---");
37             foreach (var item in hashSetUnion)
38             {
39                 Console.WriteLine(item);
40             }
41 
42             //SINTER key [key ...]
43             //summary: Intersect multiple sets
44             HashSet<string> hashSetInter = client.GetIntersectFromSets(new string[] { "s1", "s2" });
45             Console.WriteLine("---交集---");
46             foreach (var item in hashSetInter)
47             {
48                 Console.WriteLine(item);
49             }
50 
51             //SDIFF key [key ...]
52             //summary: Subtract multiple sets
53             HashSet<string> hashSetDifference = client.GetDifferencesFromSet("s1", new string[] { "s2" });
54             Console.WriteLine("---差集---");
55             foreach (var item in hashSetDifference)
56             {
57                 Console.WriteLine(item);
58             }
59         }
60     }
61 }

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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。

 1 using ServiceStack.Redis;
 2 using System;
 3 using System.Collections.Generic;
 4 using System.Text;
 5 
 6 namespace RedisDemo
 7 {
 8     class SortedSetDemo
 9     {
10         public static void Start()
11         {
12             var redisMangement = new RedisManagerPool("127.0.0.1:6379");
13             var client = redisMangement.GetClient();
14 
15             //ZADD key [NX|XX] [CH] [INCR] score member [score member ...]
16             //summary: Add one or more members to a sorted set, or update its score if it already exists
17             client.AddItemToSortedSet("grade", "Chinese", 82);
18             client.AddItemToSortedSet("grade", "Math", 96);
19             client.AddItemToSortedSet("grade", "English", 91);
20             client.AddItemToSortedSet("grade", "History", 97);
21             //ZREVRANGE key start stop [WITHSCORES]
22             //summary: Return a range of members in a sorted set, by index, with scores ordered from high to low
23             List<string> sortedList = client.GetAllItemsFromSortedSetDesc("grade");
24             foreach (var item in sortedList)
25             {
26                 Console.WriteLine(item);
27             }
28         }
29     }
30 }

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SortedSet的应用场景

排行榜（如：微博热搜排行榜）