So I'm trying to fill a DataTable with data from a MSSQL query, but for some reason it completely refuses to work and it's making me very annoyed.
When I iterate through the results with a SqlDataReader and Read(), I get the results and even when I attempt to fill the DataTable with the SqlDataAdapter, the query appears on the SQL Profiler and yet doesn't return any data.
I have no idea what has possessed my code, but maybe you can figure it out:
try
{
// Global variables
var connectionString = System.Configuration.ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
var textString = "Pasākums {0} sākas pēc {1}!";
var linkString = @"/Event/Index/{0}";
using (SqlConnection conn = new SqlConnection(connectionString))
{
// Set variables
var findIn24HrsEventsCmd = new SqlCommand(@"
SELECT adm.UserID, adm.EventID FROM [dbo].[EventAdmissions] AS adm WHERE EventID IN
(
SELECT EventID FROM [dbo].[Events]
WHERE DATEDIFF(hour, @date, StartTime) BETWEEN 0 AND 24
)
AND
(
SELECT COUNT(URL) FROM [dbo].[Notifications]
WHERE Type = 1 AND UserID = adm.UserID
AND URL LIKE '/Event/Index/'+CAST(adm.EventID AS VARCHAR(36))
) = 0", conn);
findIn24HrsEventsCmd.Parameters.Add(new SqlParameter("date", "2015-05-31 02:17:28.727"));
var test = new SqlCommand(@"SELECT * FROM [dbo].[EventAdmissions]", conn);
var findIn1HrEventsCmd = new SqlCommand(@"
SELECT adm.UserID, adm.EventID FROM [dbo].[EventAdmissions] AS adm WHERE EventID IN
(
SELECT EventID FROM [dbo].[Events]
WHERE DATEDIFF(minute, @date, StartTime) BETWEEN 0 AND 60
)
AND
(
SELECT COUNT(URL) FROM [dbo].[Notifications]
WHERE Type = 1 AND UserID = adm.UserID
AND URL LIKE '/Event/Index/'+CAST(adm.EventID AS VARCHAR(36))
) < 2", conn);
findIn1HrEventsCmd.Parameters.Add(new SqlParameter("date", "2015-05-31 02:17:28.727"));
var t = findIn1HrEventsCmd.CommandTimeout;
// Retrieve data
conn.Open();
log.Debug("Starting with the events that are on in an hour.");
// Do it first for evens within an hour
var oneHrDataAdapter = new SqlDataAdapter(test);
var oneHrDt = new DataTable();
oneHrDataAdapter.Fill(oneHrDt);
findIn1HrEventsCmd.Dispose();
findIn24HrsEventsCmd.Dispose();
oneHrDataAdapter.Dispose();
}
} catch (Exception e)
{
log.Fatal("Fatal error!" + e.Message);
}
Note how I've replaced the complex queries for a very simple test query that definitely returns results in Management Studio and with the DataReader, but doesn't work with a DataTable for some reason. Note that it isn't timing out, the server is located on the same machine and the query runs for maybe like 1-2 seconds at most.
The connection works, because as I mentioned before the DataReader approach works and also there are no exceptions thrown.
