/// <summary>
/// Deletes a student account
/// </summary>
/// <param name="student">Data of the student to be deleted</param>
/// <returns>True if operation is successful</returns>
internal static bool Delete(Student student)
{
using (SQLiteConnection conn = new SQLiteConnection("Data source=" + Database.DATABASE_NAME + ";"))
{
try
{
conn.Open();
StudentProgressMapper.Delete(student.StudentProgress);
using (SQLiteCommand cmd = new SQLiteCommand(conn))
{
cmd.CommandText = "DELETE FROM students WHERE username=@username;";
cmd.Parameters.AddWithValue("@username", student.Username);
cmd.ExecuteNonQuery();
}
using (SQLiteCommand cmd = new SQLiteCommand(conn))
{
cmd.CommandText = "DELETE FROM users WHERE username=@username;";
cmd.Parameters.AddWithValue("@username", student.Username);
cmd.ExecuteNonQuery();
}
return(true);
}
catch (Exception e)
{
Console.WriteLine("Exception at StudentMapper - Delete: " + e.Message);
return(false);
}
}
}
/// <summary>
/// Inserts a new student in the database
/// </summary>
/// <param name="student">A student object with the necessary information</param>
/// <param name="password">The password of the new professor account</param>
/// <returns>True if operation is successful</returns>
internal static bool Insert(Student student, string password)
{
using (SQLiteConnection conn = new SQLiteConnection("Data source=" + Database.DATABASE_NAME + ";"))
{
try
{
conn.Open();
using (SQLiteCommand cmd = new SQLiteCommand(conn))
{
cmd.CommandText = "INSERT INTO users (username, user_type, name, surname, password) " +
"VALUES(@username, @user_type, @name, @surname, @password);";
cmd.Parameters.AddWithValue("@username", student.Username);
cmd.Parameters.AddWithValue("@user_type", UserTypes.STUDENT);
cmd.Parameters.AddWithValue("@name", student.Name);
cmd.Parameters.AddWithValue("@surname", student.Surname);
cmd.Parameters.AddWithValue("@password", password);
cmd.ExecuteNonQuery();
}
using (SQLiteCommand cmd = new SQLiteCommand(conn))
{
cmd.CommandText = "INSERT INTO students (username) VALUES(@username);";
cmd.Parameters.AddWithValue("@username", student.Username);
cmd.ExecuteNonQuery();
}
StudentProgressMapper.Insert(student.Username);
return(true);
}
catch (Exception e)
{
Console.WriteLine("Exception at StudentMapper - Insert: " + e.Message);
return(false);
}
}
}
/// <summary>
/// Get a student user from the database
/// </summary>
/// <param name="username">Username of the student</param>
/// <returns>A student object with the necessary values</returns>
internal static Student Get(string username)
{
using (SQLiteConnection conn = new SQLiteConnection("Data source=" + Database.DATABASE_NAME + ";"))
{
try
{
conn.Open();
string name, surname;
int level;
using (SQLiteCommand cmd = new SQLiteCommand(conn))
{
cmd.CommandText = "SELECT * FROM users WHERE username=@username;";
cmd.Parameters.AddWithValue("@username", username);
using (SQLiteDataReader reader = cmd.ExecuteReader())
{
if (!reader.HasRows)
{
return(null);
}
reader.Read();
name = reader.GetString(reader.GetOrdinal("name"));
surname = reader.GetString(reader.GetOrdinal("surname"));
}
}
using (SQLiteCommand cmd = new SQLiteCommand(conn))
{
cmd.CommandText = "SELECT * FROM students WHERE username=@username;";
cmd.Parameters.AddWithValue("@username", username);
using (SQLiteDataReader reader = cmd.ExecuteReader())
{
reader.Read();
level = reader.GetInt32(reader.GetOrdinal("level"));
}
}
StudentProgress progress = StudentProgressMapper.Get(username);
Student student = new Student(username, name, surname, level, progress);
return(student);
}
catch (Exception e)
{
Console.WriteLine("Exception at StudentMapper - Get: " + e.Message);
return(null);
}
}
}
/// <summary>
/// Updates a student entry in the database
/// </summary>
/// <param name="student">Student object with the necessary information to update the database.</param>
/// <returns>True if operation is successful</returns>
internal static bool Update(Student student)
{
using (SQLiteConnection conn = new SQLiteConnection("Data source=" + Database.DATABASE_NAME + ";"))
{
try
{
conn.Open();
using (SQLiteCommand cmd = new SQLiteCommand(conn))
{
cmd.CommandText = "UPDATE users SET name=@name," +
" surname=@surname " +
"WHERE username=@username;";
cmd.Parameters.AddWithValue("@name", student.Name);
cmd.Parameters.AddWithValue("@surname", student.Surname);
cmd.Parameters.AddWithValue("@username", student.Username);
cmd.ExecuteNonQuery();
}
using (SQLiteCommand cmd = new SQLiteCommand(conn))
{
cmd.CommandText = "UPDATE students SET level=@level " +
"WHERE username=@username;";
cmd.Parameters.AddWithValue("@level", student.Level);
cmd.Parameters.AddWithValue("@username", student.Username);
cmd.ExecuteNonQuery();
}
StudentProgressMapper.Update(student.StudentProgress);
return(true);
}
catch (Exception e)
{
Console.WriteLine("Exception at StudentMapper - Update: " + e.Message);
return(false);
}
}
}