C# SqlDataReader Execution Statistics and Information

Question

Hi,

I am creating an automated DB Query Execution Queue, which essentially means I am creating a Queue of SQL Queries, that are executed one by one.

Queries are executed using code similar to the following:

using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString))
{
  cn.Open();
  using (SqlCommand cmd = new SqlCommand("SP", cn))
  {
    cmd.CommandType = CommandType.StoredProcedure;
    using (SqlDataReader dr = cmd.ExecuteReader())
    {
      while (dr.Read())
      {

      }
    }
  }
}

What I would like to do is collect as much information as I can about the execution. How long it took. How many rows were affected.

Most importantly, if it FAILED, why it failed.

Really any sort of information I can get about the execution I want to be able to save.

Answer 1

While I am a bit unsure what your question really is, with that I mean if you want a list of statistics that could be useful to save or how to get the statistics you mention above.

SqlDataReader has properties .RecordsAffected and .FieldCount that tells you a bit about how much data was returned.

You can also catch the SqlException to find out some information about what (if anything) went wrong.

Answer 2

Try using the built in statistics for the execution time and rows selected/affected:

using (SqlConnection cn = new SqlConnection(ConfigurationManager.ConnectionStrings["NorthwindConnectionString"].ConnectionString))
{
  cn.Open();
  cn.StatisticsEnabled = true;
  using (SqlCommand cmd = new SqlCommand("SP", cn))
  {
    cmd.CommandType = CommandType.StoredProcedure;
    try
    {
      using (SqlDataReader dr = cmd.ExecuteReader())
      {
        while (dr.Read())
        {

        }
      }
    }
    catch (SqlException ex)
    {
      // Inspect the "ex" exception thrown here
    }
  }

  IDictionary stats = cn.RetrieveStatistics();
  long selectRows = (long)stats["SelectRows"];
  long executionTime = (long)stats["ExecutionTime"];
}

See more on MSDN.

The only way I can see you finding out how something failed is inspecting the SqlException thrown and looking at the details.