public MainWindow()
{
InitializeComponent();
CommonLibrary.MinBookToCountVote = 15;
bgwNews = new BackgroundWorker();
bgwPopular = new BackgroundWorker();
bgwHighRated = new BackgroundWorker();
bgwRecommended = new BackgroundWorker();
LoginWindow loginWindow = new LoginWindow();
if (!CheckConnection())
{
this.Close();
}
InitializeBackgroundWorkers();
loginWindow.ShowDialog();
if (loginWindow.LoggedIn)
{
if (loginWindow.User.IsAdmin)
{
AdminPanel.AdminPanel adminPanel = new AdminPanel.AdminPanel();
adminPanel.Show();
}
CommonLibrary.LogInUser(loginWindow.User);
lblGreeting.Content = $"Welcome {CommonLibrary.LoggedInUser.Username},";
bgwNews.RunWorkerAsync();
bgwPopular.RunWorkerAsync();
bgwHighRated.RunWorkerAsync();
bgwRecommended.RunWorkerAsync();
}
else
{
this.Close();
}
}
internal static Response.BaseResponse UpdateAllWeights(BackgroundWorker bgw)
{
Response.BaseResponse response = new Response.BaseResponse();
string queryUpdate = "UPDATE `bx-books` SET `RatingWeight` = @Weight WHERE ISBN = @ISBN";
string queryGetSum = "SELECT SUM(`Book-Rating`), COUNT(`Book-Rating`) FROM `bx-book-ratings` WHERE ISBN = @ISBN";
var responseC = GetTotalAverageVotes();
double C = 0.0;
if (responseC.Success)
{
C = responseC.Content;
}
else
{
response.ErrorText += responseC.ErrorText + ".\n";
}
using (MySqlConnection conn = new MySqlConnection(connectionString))
{
try
{
var allBooksResponse = GetAllBooks();
conn.Open();
if (allBooksResponse.Success)
{
int bookCount = allBooksResponse.Content.Count, index = 0;
foreach (Book item in allBooksResponse.Content)
{
MySqlCommand commandUpdate = new MySqlCommand(queryUpdate, conn);
commandUpdate.Parameters.AddWithValue("@ISBN", item.ISBN);
MySqlCommand commandGetSum = new MySqlCommand(queryGetSum, conn);
commandGetSum.Parameters.AddWithValue("@ISBN", item.ISBN);
int count = 0;
double sum = 0.0;
try
{
using (MySqlDataReader reader = commandGetSum.ExecuteReader())
{
if (reader.Read())
{
sum = GetSafeField <double>(reader, 0);
count = (int)GetSafeField <Int64>(reader, 1);
}
else
{
throw new Exception("Can't read count and sum values for book " + item.ISBN + ".");
}
}
}
catch (Exception e)
{
response.ErrorText += e.Message + " Error occured on update at " + item.ISBN + ".\n";
continue;
}
double weight;
if (count == 0)
{
weight = 0;
}
else
{
double avg = sum / count;
weight = CommonLibrary.GetWeightRate(count, avg, C, CommonLibrary.MinBookToCountVote);
}
commandUpdate.Parameters.AddWithValue("@Weight", weight);
int rowsAffected = commandUpdate.ExecuteNonQuery();
if (rowsAffected != 1)
{
throw new Exception("Error weight update. Rows affected: " + rowsAffected);
}
bgw.ReportProgress((100 * index++) / bookCount);
}
}
else
{
throw new Exception(allBooksResponse.ErrorText);
}
response.Success = true;
}
catch (Exception e)
{
response.ErrorText = e.Message;
}
}
return(response);
}
