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Dominic Lennon
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Subquery results in SP getting lost when called in .Net App


I've written a Stored Procedure below:-

CREATE PROCEDURE [dbo].[getQuestionsByTopic]
      -- Add the parameters for the stored procedure here
      @topicId int,
      @quoteId int
      -- SET NOCOUNT ON added to prevent extra result sets from
      -- interfering with SELECT statements.

    -- Insert statements for procedure here
      SELECT q.*, a.questionAnswer, a.answerId FROM question q
      LEFT JOIN (SELECT questionId, questionAnswer, quoteId, Id AS answerId FROM questionAnswer WHERE quoteId = @quoteId) AS a ON q.questionId = a.questionId
      WHERE q.topicId = @topicId;

When ran from SQL Management Studio, it returns what I want - all questions and any answers based on Quote ID. However, when I call it in my .Net app, the fields specifically in the subquery never appear. Any ideas? Here's my code which grabs a dataset anyway:-

public DataTable getQuestionsByTopic (int topicId, int quoteId) {
                  DataTable dt = new DataTable();
                  SqlConnection conn = new SqlConnection();
                        using (SqlCommand command = new SqlCommand()) {
                              command.Connection = conn;
                              command.CommandType = CommandType.StoredProcedure;
                              command.CommandText = "getQuestionsByTopic";
                    command.Parameters.AddWithValue("@quoteId", topicId);
                    command.Parameters.AddWithValue("@topicId", topicId);

                              try { using(SqlDataAdapter adapt = new SqlDataAdapter(command)) adapt.Fill(dt); }
                              catch (Exception ex) { WritetoEventLog(ex.Message); }
                              finally { conn.Close(); }
                  return dt;
ASP.NETMicrosoft SQL Server

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Last Comment
Dominic Lennon

8/22/2022 - Mon

I suggest you replace SELECT q.* with the actual column list and to be very specific you could even cast each to the data type expected by the .NET page code.

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Dominic Lennon

Jesus christ. How obvious was that! Thanks for the answer - no wonder I never got the results I was after.
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