public DBService()
{
bool succeed = false;
while (!succeed)
{
try
{
succeed = SqlBackend.Connect();
if (!succeed)
{
Thread.Sleep(1000);
}
}
catch (Exception e)
{
succeed = false;
}
}
}
public DataTable Retrieve(DateTime start, DateTime end, string[] codes)
{
return(SqlBackend.Select(start, end, codes));
}
public void Add(Signal signal)
{
SqlBackend.Insert(signal);
}
public DataTable Retrieve(DateTime start, DateTime end)
{
return(SqlBackend.Select(start, end));
}