hash
Redis的Hash有点像一个对象（object），一个Hash里面可以存多个Key-Value对作为它的field，所以它通常可以用来表示对象。
Hash里面能存放的值也能作为String类型来存储，如果Hash里面值的类型可以解析为数字，那么也可以进行自增自减等操作。
HSET HGET
HSET 设置Hash里面的值：
语法：HSET KEY_NAME FIELD VALUE127.0.0.1:6379> HSET myhash field1 "foo"(integer) 1redis 127.0.0.1:6379> HGET myhash field1"foo"
HMSET HMGET
HMSET：同时将多个 field-value (字段-值)对设置到哈希表中。
语法： HMSET KEY_NAME FIELD1 VALUE1 ...FIELDN VALUENHMGET：返回哈希表中，一个或多个给定字段的值
语法：HMGET KEY_NAME FIELD1...FIELDN127.0.0.1:6379> HMSET myhash field1 "Hello" field2 "World"OK127.0.0.1:6379> HMGET MYHASH field11) (nil)127.0.0.1:6379> HMGET myhash field11) "Hello"127.0.0.1:6379> HMGET myhash field1 field21) "Hello"2) "World"
HGETALL
如果想获得Hash所有的Key-Value对，那就使用HGETALL：
127.0.0.1:6379> hgetall myhash1) "field1"2) "Hello"3) "field2"4) "World"127.0.0.1:6379>
HDEL
HDEL key field1 [field2]
删除一个或多个哈希表字段redis 127.0.0.1:6379> HSET myhash field1 "foo"(integer) 1redis 127.0.0.1:6379> HDEL myhash field1(integer) 1redis 127.0.0.1:6379> HDEL myhash field2(integer) 0
HEXISTS
HEXISTS key field
查看哈希表 key 中，指定的字段是否存在。redis 127.0.0.1:6379> HSET myhash field1 "foo"(integer) 1redis 127.0.0.1:6379> HEXISTS myhash field1(integer) 1redis 127.0.0.1:6379> HEXISTS myhash field2(integer) 0
HINCRBY
如果Hash里某个Field值的类型可以解析成数值，那么还可以用HINCRBY来做自增：
127.0.0.1:6379> hincrby user:1000 age 1(integer) 1127.0.0.1:6379> hincrby user:1000 age 1(integer) 2127.0.0.1:6379> hincrby user:1000 age 1(integer) 3127.0.0.1:6379> hincrby user:1000 age -1(integer) 2127.0.0.1:6379>
HINCRBYFLOAT
HINCRBYFLOAT key field increment
为哈希表 key 中的指定字段的浮点数值加上增量 increment 。redis> HSET mykey field 10.50(integer) 1redis> HINCRBYFLOAT mykey field 0.1"10.6"redis> HINCRBYFLOAT mykey field -5"5.6"redis> HSET mykey field 5.0e3(integer) 0redis> HINCRBYFLOAT mykey field 2.0e2"5200"redis>
HKEYS
HKEYS key
获取所有哈希表中的字段redis 127.0.0.1:6379> HSET myhash field1 "foo"(integer) 1redis 127.0.0.1:6379> HSET myhash field2 "bar"(integer) 1redis 127.0.0.1:6379> HKEYS myhash1) "field1"2) "field2"
HLEN
HLEN key
获取哈希表中字段的数量redis 127.0.0.1:6379> HSET myhash field1 "foo"(integer) 1redis 127.0.0.1:6379> HSET myhash field2 "bar"(integer) 1redis 127.0.0.1:6379> HLEN myhash(integer) 2
HSETNX
HSETNX key field value
只有在字段 field 不存在时，设置哈希表字段的值。如果哈希表不存在，一个新的哈希表被创建并进行 HSET 操作。
如果字段已经存在于哈希表中，操作无效。 如果 key 不存在，一个新哈希表被创建并执行 HSETNX 命令。
redis 127.0.0.1:6379> HSETNX myhash field1 "foo"(integer) 1redis 127.0.0.1:6379> HSETNX myhash field1 "bar"(integer) 0redis 127.0.0.1:6379> HGET myhash field1"foo"redis 127.0.0.1:6379> HSETNX nosql key-value-store redis(integer) 1redis 127.0.0.1:6379> HSETNX nosql key-value-store redis # 操作无效， key-value-store 已存在(integer) 0
HVALS
HVALS key
获取哈希表中所有值redis 127.0.0.1:6379> HSET myhash field1 "foo"(integer) 1redis 127.0.0.1:6379> HSET myhash field2 "bar"(integer) 1redis 127.0.0.1:6379> HVALS myhash1) "foo"2) "bar"# 空哈希表/不存在的keyredis 127.0.0.1:6379> EXISTS not_exists(integer) 0redis 127.0.0.1:6379> HVALS not_exists(empty list or set)
用.NET Core操练HASH
准备工作
1.建一个Person类
class Person { public int Id { get; set; } public string FirstName { get; set; } public string LastName { get; set; } public DateTime JoinDate { get; set; } public int Age { get; set; } public decimal BankBlance { get; set; } } 2.然后从网上抄袭了一个C#对象和Redis HashEntry[]之间转换的工具类：
static class RedisHelper { public static HashEntry[] ToHashEntries(this object obj) { PropertyInfo[] properties = obj.GetType().GetProperties(); return properties.Select(propertype => new HashEntry(propertype.Name, propertype.GetValue(obj).ToString())) .ToArray(); } public static T ConvertFromRedis (this HashEntry[] hashEntries) { PropertyInfo[] properties = typeof(T).GetProperties(); var obj = Activator.CreateInstance(typeof(T)); foreach (var property in properties) { HashEntry entry = hashEntries.FirstOrDefault(g => g.Name.ToString().Equals(property.Name)); if(entry.Equals(new HashEntry())){ continue;} property.SetValue(obj, Convert.ChangeType(entry.Value.ToString(), property.PropertyType)); } return (T) obj; } } 命令测试
static void Hash() { using (ConnectionMultiplexer redis = ConnectionMultiplexer.Connect("localhost:6379")) { IDatabase db = redis.GetDatabase(); var person = new Person(); person.Id = 123; person.FirstName = "Nick"; person.LastName = "Carter"; person.JoinDate = new DateTime(2019,4,20); person.Age = 32; person.BankBlance = 567.43m; //1.HSET db.HashSet("user:123", person.ToHashEntries()); //2.HGETALL 获取所有 HashEntry[] entries = db.HashGetAll("user:123"); foreach (HashEntry entry in entries) { Console.WriteLine(entry.Name); } Console.WriteLine(); //获取这个对象 Console.WriteLine("获取这个对象"); var thePerson = entries.ConvertFromRedis (); Console.WriteLine(thePerson.FirstName); //Nick Console.WriteLine(thePerson.Age); //32 Console.WriteLine(); //3.HGET 获取一个 var age = db.HashGet("user:123", nameof(person.Age)); Console.WriteLine(age);//32 Console.WriteLine(); //4.HMGET 获取多个 RedisValue[] values = db.HashGet("user:123", new RedisValue[] { nameof(person.Id), nameof(person.FirstName), nameof(person.Age), nameof(person.BankBlance), }); foreach (RedisValue redisValue in values) { Console.WriteLine(redisValue); } // 123 // Nick // 32 // 567.43 Console.WriteLine(); //5.HINCRBY 自增整数 var ageIncrement = db.HashIncrement("user:123", nameof(person.Age)); Console.WriteLine(ageIncrement); //33 ageIncrement = db.HashIncrement("user:123", nameof(person.Age),5); Console.WriteLine(ageIncrement); //38 Console.WriteLine(); //6.HDEL 删除 var ageDelSuccess = db.HashDelete("user:123", nameof(person.Age)); Console.WriteLine(ageDelSuccess); //true var ageDel = db.HashGet("user:123", nameof(person.Age)); Console.WriteLine(ageDel); //null //7.HSCAN 迭代 IEnumerable entriesEnumerable = db.HashScan("user:123"); foreach (HashEntry hashEntry in entriesEnumerable) { Console.WriteLine($"{hashEntry.Name}:{hashEntry.Value}"); } // Id: 123 // FirstName: Nick // LastName:Carter // JoinDate:2019 / 4 / 20 0:00:00 // BankBlance: 567.43 } } HSCAN
HSCAN key cursor [MATCH pattern] [COUNT count]
迭代哈希表中的键值对。参考：
草根专栏，
runoob，