基於.Net Core的Redis：基本數據類型及其應用場景與命令行操做

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

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

一、使用的Redis客戶端爲：ServiceStack.Redis
打開「程序包管理器控制檯」，輸入並執行「Install-Package ServiceStack.Redis」便可。

二、Redis基本數據類型：String
String類型是最經常使用的數據類型，在Redis中以KKey/Value存儲。

 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             //---對象---
25             var todos = client.As<Todo>();
26             Todo todo = new Todo
27             {
28                 Id = todos.GetNextSequence(),
29                 Content = "String Demo",
30                 Order = 1
31             };
32             client.Set<Todo>("todo", todo);
33             var getTodo = client.Get<Todo>("todo");
34             Console.WriteLine(getTodo.Content);
35         }
36     }
37 }

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String的應用場景

計數器：許多運用都會使用redis做爲計數的基礎工具，他能夠實現快速計數、查詢緩存的功能。

好比：優酷視頻的播放：incr video:videoId:playTimes

或者：文章瀏覽量：incr article:aricleId:clickTimes

或者粉絲數量：取關 decr author:authorId:fansNumber

 三、Redis基本數據類型：Hash
Hash在Redis採用 (HashId,Key，Value)進行存儲，一個HashId 能夠包含多個key，一個key對應着一個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             //---獲取test哈希下的全部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             //---獲取test哈希下的全部值---
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             //---獲取test哈希下，第一個Key對應的值---
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]}對應的值{value}");
45         }
46     }
47 }

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Hash的應用場景

商品詳情頁

四、Redis基本數據類型：List
list是一個鏈表結構，key能夠理解爲鏈表的名字，而後往這個名字所對應的鏈表里加值。，list能夠以隊列 / 棧的形式進行工做。

 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             //---隊列的使用（先進先出）---
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             //---棧的使用（先進後出）---
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的應用場景

點贊：
建立一條微博內容：set user:1:post:91 「hello redis」;
點贊：
lpush post:91:good 「kobe.png」
lpush post:91:good 「jordan.png」
lpush post:91:good 「James.png」
查看有多少人點贊：llen post:91:good
查看有哪些人點贊：lrange post:91:good 0 -1

 五、Redis基本數據類型：Set
它是去重、無序集合。set是經過hash table實現的，添加，刪除和查找,對集合咱們能夠取並集，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("---並集---");
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的應用場景

隨機事件（如：抽獎）、共同好友、推薦好友等

六、Redis基本數據類型：SortedSet
set是一種很是方便的結構，可是數據無序，redis提供了一個sorted set，每個添加的值都有一個對應的分數，放進去的值按照該分數升序存在一個集合中，能夠經過這個分數進行相關排序的操做。

 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的應用場景

排行榜（如：微博熱搜排行榜）