How to return custom table types from Npgsql and stored procedures?

Question

I\'m trying to return a custom (composite) type based on an implicit table type.

I have this table definition:

CREATE TABLE app_user (id CHAR(36) PRI         


        

Answer 1

Looks like I figured it out. Turned out to be easier than I thought. All I needed to change was the way the stored procedure was called from C#.

ApplicationUser user;
using (NpgsqlConnection db = new NpgsqlConnection(this.connectionString))
{
    db.Open();
    using (NpgsqlCommand cmd = new NpgsqlCommand("SELECT find_by_id(@user_id);", db))
    {
        cmd.Parameters.AddWithValue("user_id", userId);
        object result = cmd.ExecuteScalar();
        user = result == DBNull.Value ? null : (ApplicationUser)result;
    }
}

I preferred the other way of invoking the stored procedure, but at least this works!