How to map JSON from bank in Dapper using C # dictionary?

Question

I have a MySQL database and I have a JSON column that stores items as follows:

[{"key":"value"},{"key2","value2"},...}

How can I handle this and load into a C # dictionary? I'm getting error converting from string to dictionary

Example of model:

public class Person
{
  string name;
  Dictionary<string, string> itens;
}

Answer 1

You need to first select it. Dapper does not support this out of the box . Then you could use Newtonsoft.JSON ( NuGet-Package ) and use it's deserializer like so:

myPerson.itens = JsonConvert.DeserializeObject<Dictionary<string, string>>(json);

Reference: https://www.newtonsoft.com/json/help/html/DeserializeDictionary.htm

Answer 2

Dictionary<string, string> dir = new Dictionary<string, string>();

                    string splitOn = "value";


                    dir = cnn.Query<string, string, KeyValuePair<string, string>>("YOUR_SP", (s, i) => new KeyValuePair<string, string>(s, i), null, null, false, splitOn, null, null)
        .ToDictionary(kv => kv.Key, kv => kv.Value);

Answer 3

You have to create a Custom Handler. I've written detailed articles on that subject.

• https://medium.com/dapper-net/custom-type-handling-4b447b97c620
• https://medium.com/dapper-net/one-to-many-mapping-with-dapper-55ae6a65cfd4

Samples are also available on GitHub:

https://github.com/yorek/dapper-samples

I've used SQL Server as RDBMS, but everything should apply as is to MySQL