/// <summary>
/// Gets the learn sessions.
/// </summary>
/// <param name="lmId">The lm id.</param>
/// <returns></returns>
/// <remarks>Documented by Dev08, 2009-01-13</remarks>
public List <int> GetLearnSessions(int lmId)
{
object learnSessionsCache = parent.CurrentUser.Cache[ObjectLifetimeIdentifier.GetIdentifier(CacheObject.StatisticsLearnSessions, lmId)];
MsSqlCeStatisticConnector c = MsSqlCeStatisticConnector.GetInstance(parent);
//The data of GetLearnSession can be cached until a new session was created.
if (runningSessionCopy == c.RunningSession && learnSessionsCache != null)
{
return(learnSessionsCache as List <int>);
}
//if cache is empty or the RunningSession has changed...
SqlCeCommand cmd = MSSQLCEConn.CreateCommand(parent.CurrentUser);
cmd.CommandText = "SELECT id FROM \"LearningSessions\" WHERE lm_id = @lmId AND user_id=@uid ORDER BY endtime ASC";
cmd.Parameters.Add("@lmId", lmId);
cmd.Parameters.Add("@uid", parent.CurrentUser.Id);
List <int> output = new List <int>();
SqlCeDataReader reader = MSSQLCEConn.ExecuteReader(cmd);
while (reader.Read())
{
object id = reader["id"];
int id_converted = Convert.ToInt32(id);
output.Add(id_converted);
}
reader.Close();
runningSessionCopy = c.RunningSession;
//Save to Cache
parent.CurrentUser.Cache[ObjectLifetimeIdentifier.Create(CacheObject.StatisticsLearnSessions, lmId, Cache.DefaultStatisticValidationTime)] = output;
return(output);
}
/// <summary>
/// Closes the user session.
/// </summary>
/// <param name="last_entry">The last_entry.</param>
/// <remarks>Documented by Dev10, 2009-01-11</remarks>
public void CloseUserSession(int last_entry)
{
SqlCeCommand cmd = MSSQLCEConn.CreateCommand(Parent.CurrentUser);
cmd.CommandText = "UPDATE LearningSessions SET endtime=GETDATE() WHERE id=@id";
cmd.Parameters.Add("@id", last_entry);
MSSQLCEConn.ExecuteNonQuery(cmd);
//Following Statement does add the "RunningSession" = false to the current Statistic.
MsSqlCeStatisticConnector connector = MsSqlCeStatisticConnector.GetInstance(Parent);
connector.RunningSession = -1;
}
/// <summary>
/// Creates a new user session.
/// The old one will be automatically closed, in case of inconsistance data.
/// </summary>
/// <param name="lm_id">The lm_id.</param>
/// <returns></returns>
/// <remarks>Documented by Dev10, 2009-01-11</remarks>
/// <remarks>Documented by Dev08, 2009-04-28</remarks>
public int OpenUserSession(int lm_id)
{
//1. Check if the old session is closed
bool previousSessionExisting = false;
DateTime?endtime = null;
int latestSessionId = 0;
SqlCeCommand cmd = MSSQLCEConn.CreateCommand(Parent.CurrentUser);
cmd.CommandText = "SELECT * FROM LearningSessions WHERE lm_id=@lmid AND user_id=@userid ORDER BY starttime DESC";
cmd.Parameters.Add("@lmid", lm_id);
cmd.Parameters.Add("@userid", Parent.CurrentUser.Id);
SqlCeDataReader reader = MSSQLCEConn.ExecuteReader(cmd);
if (reader.Read())
{
previousSessionExisting = true;
try
{
latestSessionId = Convert.ToInt32(reader["id"]);
endtime = Convert.ToDateTime(reader["endtime"]);
}
catch
{
endtime = null;
}
}
//2. Close the previous session, if it hasn't closed before (maybe cause of crash of ML)
if (previousSessionExisting && !endtime.HasValue)
{
cmd.Parameters.Clear();
cmd.CommandText = "UPDATE LearningSessions SET endtime=GETDATE() WHERE id=@id";
cmd.Parameters.Add("@id", latestSessionId);
MSSQLCEConn.ExecuteNonQuery(cmd);
}
//3. Add new session entry to DB
cmd.Parameters.Clear();
cmd.CommandText = "INSERT INTO LearningSessions (user_id, lm_id, starttime, sum_right, sum_wrong, pool_content, box1_content, box2_content, box3_content, " +
"box4_content, box5_content, box6_content, box7_content, box8_content, box9_content, box10_content)" +
"VALUES(@userid, @lmid, GETDATE(), 0, 0, @pool, @b1, @b2, @b3, @b4, @b5, @b6, @b7, @b8, @b9, @b10); SELECT @@IDENTITY;";
cmd.Parameters.Add("@userid", Parent.CurrentUser.Id);
cmd.Parameters.Add("@lmid", lm_id);
int counter = 0;
int cardsInBoxes = 0;
BoxSizes boxContent = GetCurrentBoxContent();
foreach (int box in boxContent.Sizes)
{
if (counter == 0)
{
cmd.Parameters.Add("@pool", box);
++counter;
continue;
}
cmd.Parameters.Add("@b" + Convert.ToString(counter++), box);
cardsInBoxes += box;
}
int newSessionId = MSSQLCEConn.ExecuteScalar <int>(cmd).Value;
//Following Statement does add the "RunningSession" = true to the current Statistic.
MsSqlCeStatisticConnector connector = MsSqlCeStatisticConnector.GetInstance(Parent);
connector.RunningSession = newSessionId;
return(newSessionId);
}