Redis Hash Datatype for .NET developers

Redis Hash Datatype are similar to Dictionary in C#. Redis Hash datatype is a mapping of key as string and value as a string. Redis hashes are memory optimized.

var hashKey = “hashKey”;

  HashEntry[] redisMerchantDetails= {

    new HashEntry(“Name”, “Ravindra Naik”),

    new HashEntry(“Age”, 26),

    new HashEntry(“Profession”, “Software Engineer”)

  };

  redis.HashSet(hashKey, redisMerchantDetails);

  if (redis.HashExists(hashKey, “Age”))

  {

    var age= redis.HashGet(hashKey, “Age”); //Age is 26

  }

  var allHash = redis.HashGetAll(hashKey);

  //get all the items

  foreach (var item in allHash)

  {

    //output

    //key: Name, value: Ravindra Naik

    //key: Age , value: 26

    //key: Profession, value: Software Engineer

    Console.WriteLine(string.Format(“key : {0}, value : {1}”, item.Name, item.Value));

  }

  //get all the values

  var values = redis.HashValues(hashKey);

  foreach (var val in values)

  {

    Console.WriteLine(val); //result =Ravindra Naik, 26, Software Engineer

  }

  //get all the keys

  var keys = redis.HashKeys(hashKey);

  foreach (var k in keys)

  {

    Console.WriteLine(k); //result = Name, Age, Profession

  }

  var len = redis.HashLength(hashKey);  //result of len is 3

            

  if (redis.HashExists(hashKey, “Age”))

  {

    var age= redis.HashIncrement(hashKey, “Age”, 1); //year now becomes 27

    var age2= redis.HashDecrement(hashKey, “Age”, 1.5); //year now becomes 25.5

  }

• Here is how you can save, retrieve, update, increment and decrement the value.
• HashExists takes O(1) for checking the existence of a field, HashGetAll takes O(n) to get all n values of hash key and O(1) if n is small.

Thanks for dropping by !!! Feel free to comment to this post or you can also drop me an email at naik899@gmail.com.
The post Redis Hash Datatype for .NET developers appeared first on TechPatch.