.net operation redis hash object

One 、Hash Object overview

Hash is widely used in many programming languages , And in the Redis It's the same with China , stay redis in , Hash type refers to Redis The value in the key value pair itself is a key value pair structure , Form like value=[{field1,value1},...{fieldN,valueN}].

Redis Each of them hash Can be stored 232 - 1 Key value pair （40 More than ）.

Two 、 Use scenarios

Redis Hash objects are often used to cache some object information , Such as user information 、 Commodity information 、 Configuration information, etc .

3、 ... and 、.NET operation

1、 Basic operation

string hashid = "kgxk";
client.SetEntryInHash(hashid, "id", "001");
Console.WriteLine(client.GetValuesFromHash(hashid, "id").FirstOrDefault());
Console.WriteLine(client.GetValuesFromHash(hashid, "name").FirstOrDefault());
client.SetEntryInHash(hashid, "socre", "100");
Console.WriteLine(client.GetValuesFromHash(hashid, "socre").FirstOrDefault());

2、 Batch add key Value

Dictionary<string, string> pairs = new Dictionary<string, string>();
pairs.Add("id", "001");
pairs.Add("name", "kgxk");
client.SetRangeInHash(hashid, pairs);
// Get current key Value 
Console.WriteLine(client.GetValueFromHash(hashid, "id"));
Console.WriteLine(client.GetValueFromHash(hashid, "name"));
// Get all the small things you want at one time key（ Attribute ） value    If key non-existent , It returns null , Don't throw exceptions 
var list = client.GetValuesFromHash(hashid, "id", "name", "abc");
Console.WriteLine("*********");
foreach (var item in list)
{
   Console.WriteLine(item);
}

3、 If hashid Exists in collection key/value Return without adding false, If it doesn't exist, add key/value, return true

Console.WriteLine(client.SetEntryInHashIfNotExists(hashid, "name", " you're pretty "));
Console.WriteLine(client.SetEntryInHashIfNotExists(hashid, "name", " you're pretty   Ha ha ha "));
Console.WriteLine(client.GetValuesFromHash(hashid, "name").FirstOrDefault());

4、 Store the object T t To hash Collection

//urn:  Class name : id Value  、、 If you use object operations , Be sure to have id
client.StoreAsHash<UserInfo>(new UserInfo() { Id = 1, Name = "KGXK", Number = 0 });
client.StoreAsHash<UserInfo>(new UserInfo() { Id = 2, Name = "SXY", Number = 1 });
var olduserinfo = client.GetFromHash<UserInfo>(2);
Console.WriteLine(olduserinfo.Id);

// If id exist , Then overwrite the same id  He helps us serialize or reflect something 
client.StoreAsHash<UserInfo>(new UserInfo() { Id = 2, Name = "KGXK2" });
// Get objects T in ID by id The data of .  There must be attributes id, Case insensitive 
Console.WriteLine(client.GetFromHash<UserInfo>(1).Name);
var olduserinfo = client.GetFromHash<UserInfo>(1);
olduserinfo.Number = 4;
client.StoreAsHash<UserInfo>(olduserinfo);
Console.WriteLine(" The final result " + client.GetFromHash<UserInfo>(1).Number);

UserInfo lisi = new UserInfo() { Id = 1, Name = " Li Si ", Number = 0 };
client.StoreAsHash<UserInfo>(lisi);
Console.WriteLine(client.GetFromHash<UserInfo>(1).Number);
// Make a self increase 
var oldzhang = client.GetFromHash<UserInfo>(1);
oldzhang.Number++;
client.StoreAsHash<UserInfo>(oldzhang);

5、 obtain hashid The total number of data in the dataset

Dictionary<string, string> pairs = new Dictionary<string, string>();
pairs.Add("id", "001");
pairs.Add("name", "kgxk");
client.SetRangeInHash(hashid, pairs);
// Get the total number of data 
Console.WriteLine(client.GetHashCount(hashid));

6、 obtain hashid All in the dataset key or value Set

Dictionary<string, string> pairs = new Dictionary<string, string>();
pairs.Add("id", "001");
pairs.Add("name", "kgxk");
client.SetRangeInHash(hashid, pairs);
var keys = client.GetHashKeys(hashid);//key
//var values = client.GetHashValues(hashid); //value
foreach (var item in keys)
{
   Console.WriteLine(item);
}

7、 Delete hashid In dataset key data

Dictionary<string, string> pairs = new Dictionary<string, string>();
pairs.Add("id", "001");
pairs.Add("name", "kgxk");
client.SetRangeInHash(hashid, pairs);
client.RemoveEntryFromHash(hashid, "id");
var values = client.GetHashValues(hashid);
foreach (var item in values)
{
   Console.WriteLine(item);
}

8、 Judge hashid Whether the data set exists key

Dictionary<string, string> pairs = new Dictionary<string, string>();
pairs.Add("id", "001");
pairs.Add("name", "kgxk");
client.SetRangeInHash(hashid, pairs);
Console.WriteLine(client.HashContainsEntry(hashid, "id")); //T  F
Console.WriteLine(client.HashContainsEntry(hashid, "number"));// T F

9、 to hashid Data sets key Of value Add countby, Return the added data

Dictionary<string, string> pairs = new Dictionary<string, string>();
pairs.Add("id", "001");
pairs.Add("name", "kgxk");
pairs.Add("number", "2");
client.SetRangeInHash(hashid, pairs);
Console.WriteLine(client.IncrementValueInHash(hashid, "number", 2));
// Be careful , The stored value must be of numeric type , Otherwise, throw an exception 

10、 Generic encapsulation

public static class HashHelper
    {
		public static void StoreAsHash<T>(T model,RedisClient client) where T : class, new()
		{
			// Get all fields of the current type 
			Type type = model.GetType();
			var fields = type.GetProperties();
			// urn:  Class name : id Value 
			var hashid = type.FullName;
			Dictionary<string, string> pairs = new Dictionary<string, string>();
			var IdValue = string.Empty;
			for (int i = 0; i < fields.Length; i++)
			{
				if (fields[i].Name.ToLower() == "id")
				{
					// If you really put two of the same id The object of is saved , I may only change one of them 
					// impossible , If there are two identical id The object of is saved , Then the latter will replace the former 
					IdValue = fields[i].GetValue(model).ToString();
				}
				else
				{
					//  Get the value of the field 
					pairs.Add(fields[i].Name, fields[i].GetValue(model).ToString());
				}

			}
			if (IdValue == string.Empty)
			{
				IdValue = DateTime.Now.ToString("yyyyMMdd");
			}
			
			client.SetRangeInHash(hashid + IdValue, pairs);
		}

		public static T GetFromHash<T>(object id, RedisClient client) where T : class, new()
		{
			// Get all fields of the current type 
			Type type = typeof(T);
			// urn:  Class name : id Value 
			var hashid = type.FullName;
			
			var dics = client.GetAllEntriesFromHash(hashid + id.ToString());
			if (dics.Count == 0)
			{
				return new T();
			}
			else
			{
				var model = Activator.CreateInstance(type);
				var fields = type.GetProperties();
				foreach (var item in fields)
				{
					if (item.Name.ToLower() == "id")
					{
						item.SetValue(model, id);
					}
					if (dics.ContainsKey(item.Name))
					{
						item.SetValue(model, dics[item.Name]);
					}
				}
				return (T)model;
			}


		}
	}

call

HashHelper.StoreAsHash<UserInfoTwo>(new UserInfoTwo() { Id = "10001", Name = "MMM" }, client);
var user = HashHelper.GetFromHash<UserInfoTwo>("10001", client);
Console.WriteLine(user.Name);
Console.WriteLine(user.Id);