Web API to query SQL Server and return result is not working as expected - asp.net

Question

I am trying to connect to SQL Server from the Web API and return a result set as JSON. But my code shown here is not working as expected. I am trying to return the entire query response as a JSON:
[HttpGet]
public HttpResponseMessage Getdetails(string ROOM)
{
string commandText = "SELECT * from [TDB].[dbo].[results_vw] where ROOM = #ROOM_Data";
string connStr = ConfigurationManager.ConnectionStrings["TDBConnection"].ConnectionString;
var jsonResult = new StringBuilder();
using (SqlConnection connection = new SqlConnection(connStr))
{
SqlCommand command = new SqlCommand(commandText, connection);
command.Parameters.Add("#ROOM_Data", SqlDbType.VarChar);
command.Parameters["#ROOM_Data"].Value = ROOM;
connection.Open();
var reader = command.ExecuteReader();
if (!reader.HasRows)
{
jsonResult.Append("[]");
}
else
{
while (reader.Read())
{
jsonResult.Append(reader.GetValue(0).ToString());
}
}
var response = new HttpResponseMessage(System.Net.HttpStatusCode.OK);
response.Content = new StringContent(jsonResult.ToString());
connection.Close();
return response;
}
}
This code returns this result:
333838362692368203368203368203362692368203359544362692368203362692368203362692368203368203
Where I am expecting the JSON as
{"data":
[
{"R_ID":"368203","ROOM":"K2"},
{"R_ID":"368203","ROOM":"K2"}
]}
Now I created a model class called DatabaseResult to store the response but I am not sure how I can store the result in to the model class in the controller
public class DatabaseResult
{
public int r_id { get; set; }
public string room { get; set; }
}

Answer 1

The current result is because you are only return the the value from the first column of each row and adding it to the string builder.
Create a new instance of the model and populate it using the values from the reader for each row.
[HttpGet]
public IHttpActionResult Getdetails(string ROOM) {
string commandText = "SELECT * from [TDB].[dbo].[results_vw] where ROOM = #ROOM_Data";
string connStr = ConfigurationManager.ConnectionStrings["TDBConnection"].ConnectionString;
var jsonResult = new StringBuilder();
using (SqlConnection connection = new SqlConnection(connStr)) {
using (SqlCommand command = new SqlCommand(commandText, connection)) {
command.Parameters.Add("#ROOM_Data", SqlDbType.VarChar);
command.Parameters["#ROOM_Data"].Value = ROOM;
connection.Open();
List<DatabaseResult> records = new List<DatabaseResult>();
using (var reader = command.ExecuteReader()) {
while (reader.Read()) {
var row = new DatabaseResult {
r_id = (int)reader["r_id"],
room = (string)reader["room"],
//...other properties.
};
records.Add(row);
}
return Ok(records);
}
}
}
}
The above uses the column names as the indexer to get the values from the reader.