Insert JSON data into postgres using .NET core 2.0 and entity framework

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I am a newbie to PostgreSQL db and we're trying to implement an endpoint to save JSON data to PostgreSQL DB using the .NET Core 2.0 api's

# PostgreSQL Table Definition:
ID - UUID
DeptId - int4
DeptSettings - json

Can anyone please share a code sample to save json data to PostgreSQL using Entity Framework in .NET Core/C#?

Thank you in advance.

What I have tried:

Unable to find any solution for the same over internet. Henceforth, reaching out to broader forum.

Posted 16-Jul-18 20:00pm

Vipul_Ch

Updated 21-Jul-18 16:31pm

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Raghu m u · Answer 1 · 2018-07-21T16:32:00

Json type is mapped to string in .Net. So, define DeptSettings as string in entity model.

C#

public class Department {
  public Guid Id { get; set; }
  public int DeptId { get; set; }
  public string DeptSettings { get; set; }
}

In the ApplicationDbContext file, explicitly specify the PostgreSQL data type by adding the following to your model's OnModelCreating:

C#

protected override void OnModelCreating(ModelBuilder builder) {
  builder.Entity<Department>().Property(d => d.DeptSettings).HasColumnType("json");
}

This way, the string will be cast to json and stored in the database.

Note: The value of the DeptSettings must be a string.