private void saveResultButton_Click(object sender, EventArgs e)
{
/*
* Insert result into results table
*/
SqlCommand comm = new SqlCommand();
comm.Parameters.AddWithValue("@StudentId", Students.GetStudentIdByName(studentsListBox.SelectedItem.ToString()));
comm.Parameters.AddWithValue("@FinalGrade", (string)resultsComboBox.SelectedItem);
comm.Parameters.AddWithValue("@AssignmentId", assignmentId);
// Update the result, however if the affected rowcount is 0, insert a new result as there is nothing to update.
if (isHomework)
{
comm.CommandText = "UPDATE HomeworkResults SET FinalGrade=@FinalGrade WHERE StudentId=@StudentId AND HomeworkId=@AssignmentId ";
comm.CommandText += "IF @@ROWCOUNT = 0 INSERT INTO HomeworkResults VALUES (@assignmentId, @StudentId, @FinalGrade)";
SqlTools.ExecuteNonQuery(comm);
}
else
{
comm.CommandText = "UPDATE TestResults SET FinalGrade=@FinalGrade WHERE StudentId=@StudentId AND TestId=@AssignmentId ";
comm.CommandText += "IF @@ROWCOUNT = 0 INSERT INTO TestResults VALUES (@assignmentId, @StudentId, @FinalGrade)";
SqlTools.ExecuteNonQuery(comm);
}
}
private void studentsListBox_SelectedIndexChanged(object sender, EventArgs e)
{
SqlCommand comm = new SqlCommand();
comm.Parameters.AddWithValue("@StudentId", Students.GetStudentIdByName(studentsListBox.SelectedItem.ToString()));
comm.Parameters.AddWithValue("@AssignmentId", assignmentId);
if (isHomework)
{
comm.CommandText = "SELECT FinalGrade FROM HomeworkResults WHERE StudentId=@StudentId AND HomeworkId=@AssignmentId";
}
else
{
comm.CommandText = "SELECT FinalGrade FROM TestResults WHERE StudentId=@StudentId AND TestId=@AssignmentId";
}
try
{
string grade = (string)SqlTools.GetTable(comm).Rows[0]["FinalGrade"];
resultsComboBox.SelectedItem = grade;
}
catch (Exception)
{
// There isn't a result for them yet.
}
}
public static void UpdateMTGs(int studentId, Dictionary <int, string> grades)
{
/*
* Update a students minimum target grades.
*/
// Delete all the mtg's. This is easier than finding what changed and updating them.
SqlCommand comm = new SqlCommand("DELETE FROM MinimumTargetGrades WHERE StudentId=@StudentId");
comm.Parameters.AddWithValue("@StudentId", studentId);
SqlTools.ExecuteNonQuery(comm);
comm.CommandText = "INSERT INTO MinimumTargetGrades VALUES (@StudentId, @SubjectId, @Grade)";
SqlParameter subjectParameter = new SqlParameter("@SubjectId", 0);
SqlParameter gradeParameter = new SqlParameter("@Grade", 0);
comm.Parameters.Add(subjectParameter);
comm.Parameters.Add(gradeParameter);
// For each key, add the subject and minimum target grade.
foreach (int subjectId in grades.Keys)
{
subjectParameter.Value = subjectId;
gradeParameter.Value = grades[subjectId];
SqlTools.ExecuteNonQuery(comm);
}
}
private void LoginButton_Click(object sender, EventArgs e)
{
string username = usernameBox.Text;
Debug.WriteLine(username);
// Run plain-text password through algorithm
string password = HashingAlgorithm(passwordBox.Text);
try
{
SqlCommand comm = new SqlCommand("SELECT StaffPassword FROM Staff WHERE StaffUsername = @StaffUsername");
comm.Parameters.AddWithValue("@StaffUsername", username);
DataTable dt = SqlTools.GetTable(comm);
// If password needs to be reset, don't continue
if ((string)dt.Rows[0]["StaffPassword"] == "")
{
ResetPasswordForm pwForm = new ResetPasswordForm(username);
pwForm.ShowDialog();
pwForm.Dispose();
}
else
{
if ((string)dt.Rows[0]["StaffPassword"] == password)
{
switch (Staff.GetPermissionLevel(username))
{
case PermissionLevel.Overseer:
int staffId = Staff.GetStaffIdByUsername(username);
OverseerForm of = new OverseerForm
{
StaffId = staffId,
isTutor = false
};
Hide();
of.FormClosed += (s, args) => Close();
of.Show();
break;
case PermissionLevel.Admin:
AdminForm af = new AdminForm();
Hide();
af.FormClosed += (s, args) => Close();
af.Show();
break;
case PermissionLevel.Teacher:
staffId = Staff.GetStaffIdByUsername(username);
TeacherMainForm tf = new TeacherMainForm
{
StaffId = staffId,
StaffName = Staff.GetStaffNameById(staffId),
};
Hide();
tf.FormClosed += (s, args) => Close();
tf.Show();
break;
default:
MessageBox.Show("Future system will have lower permission levels");
break;
}
}
else
{
// The password must be wrong if the username is right.
invalidPasswordLabel.Show();
}
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
// Unfortunately, we have to assume the username is wrong.
// The end-user can't have done much else wrong - except a bad
// username.
invalidUsernameLabel.Show();
throw ex;
}
}
public static GradeData calculateStudentGrades(int studentId, int groupId)
{
double hwAverage = 0, testAverage = 0, mtg = 0;
SqlCommand comm = new SqlCommand();
comm.CommandText = "SELECT FinalGrade FROM HomeworkResults ";
comm.CommandText += "INNER JOIN Homeworks ON HomeworkResults.HomeworkId=Homeworks.HomeworkId ";
comm.CommandText += "WHERE HomeworkResults.StudentId=@StudentId AND Homeworks.GroupId=@GroupId";
comm.Parameters.AddWithValue("@StudentId", studentId);
comm.Parameters.AddWithValue("@GroupId", groupId);
// Get a table of all homework results.
DataTable dt = SqlTools.GetTable(comm);
if (dt.Rows.Count != 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
hwAverage += Grades[(string)dt.Rows[i]["FinalGrade"]];
}
hwAverage /= dt.Rows.Count;
// Use LINQ to find the closest value to the divided average.
hwAverage = GradeVals.Aggregate((x, y) => Math.Abs(x - hwAverage) < Math.Abs(y - hwAverage) ? x : y);
}
// Do the same with test results.
comm.CommandText = "SELECT FinalGrade FROM TestResults ";
comm.CommandText += "INNER JOIN Tests ON TestResults.TestId=Tests.TestId ";
comm.CommandText += "WHERE TestResults.StudentId=@StudentId AND Tests.GroupId=@GroupId";
dt = SqlTools.GetTable(comm);
if (dt.Rows.Count != 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
testAverage += Grades[(string)dt.Rows[i]["FinalGrade"]];
}
testAverage /= dt.Rows.Count;
testAverage = GradeVals.Aggregate((x, y) => Math.Abs(x - testAverage) < Math.Abs(y - testAverage) ? x : y);
}
// Grab minimum target grade.
// Get subject ID
int subjectId = Groups.GetSubjectId(groupId);
comm.CommandText = "SELECT Grade FROM MinimumTargetGrades WHERE SubjectId=@SubjectId AND StudentId=@StudentId";
comm.Parameters.AddWithValue("@SubjectId", subjectId);
dt = SqlTools.GetTable(comm);
if (dt.Rows.Count != 0)
{
mtg = Grades[(string)dt.Rows[0]["Grade"]];
}
// Work out their predicted grade based from this average data.
double[] MLR = Subjects.GetSubjectMLR(subjectId);
double predicted = calculateGrade(hwAverage, testAverage, mtg, MLR);
predicted = GradeVals.Aggregate((x, y) => Math.Abs(x - predicted) < Math.Abs(y - predicted) ? x : y);
return(new GradeData
{
HwAverage = hwAverage,
TestAverage = testAverage,
MTG = mtg,
Predicted = predicted
});
}
public static void UpdateSubjectMLR(int subjectId)
{
/*
* UpdateSubjectMLR is responsible for re-running the MLR line
* calculation for a subject. This is a difficult calcuation,
* so this shouldn't be done too often. After the calcuation is
* done, store the values of each variable in the MLR equation
* in the database.
*/
List <double> homeworkResults = new List <double>();
List <double> testResults = new List <double>();
List <double> minimumTargetGrades = new List <double>();
List <double> finalResults = new List <double>();
/* Populate all the lists.
* Remember to convert grades to their double eqv. using the dictonary. */
SqlCommand command = new SqlCommand("SELECT HomeworkResult FROM PreviousResults WHERE SubjectId = @SubjectId");
command.Parameters.AddWithValue("@SubjectId", subjectId);
DataTable dt = SqlTools.GetTable(command);
for (int i = 0; i < dt.Rows.Count; i++)
{
homeworkResults.Add(Grades[(string)dt.Rows[i]["HomeworkResult"]]);
}
command.CommandText = "SELECT TestResult FROM PreviousResults WHERE SubjectId = @SubjectId";
dt = SqlTools.GetTable(command);
for (int i = 0; i < dt.Rows.Count; i++)
{
testResults.Add(Grades[(string)dt.Rows[i]["TestResult"]]);
}
command.CommandText = "SELECT MTGResult FROM PreviousResults WHERE SubjectId = @SubjectId";
dt = SqlTools.GetTable(command);
for (int i = 0; i < dt.Rows.Count; i++)
{
minimumTargetGrades.Add(Grades[(string)dt.Rows[i]["MTGResult"]]);
}
command.CommandText = "SELECT FinalResult FROM PreviousResults WHERE SubjectId = @SubjectId";
dt = SqlTools.GetTable(command);
for (int i = 0; i < dt.Rows.Count; i++)
{
finalResults.Add(Grades[(string)dt.Rows[i]["FinalResult"]]);
}
/*
* Calculate the MLR line.
* Returned double array:
* MLRLine[0]: Constant
* MLRLine[1]: Homework result weight
* MLRLine[2]: Test result weight
* MLRLine[3]: Minimum target grade weight
*/
double[] MLRLine = GradeUtils.calculateSubjectMLR(homeworkResults, testResults, minimumTargetGrades, finalResults);
/*
* Setup the SQL command.
* SubjectID doesn't change here.
*/
command.CommandText = "UPDATE Subjects SET SubjectWeightConstant = @SubjectWeightConstant, " +
"SubjectHomeworkWeight = @SubjectHomeworkWeight, " +
"SubjectTestWeight = @SubjectTestWeight, " +
"SubjectMTGWeight = @SubjectMTGWeight WHERE SubjectID = @SubjectID";
// Add each parameter.
command.Parameters.AddWithValue("@SubjectWeightConstant", MLRLine[0]);
command.Parameters.AddWithValue("@SubjectHomeworkWeight", MLRLine[1]);
command.Parameters.AddWithValue("@SubjectTestWeight", MLRLine[2]);
command.Parameters.AddWithValue("@SubjectMTGWeight", MLRLine[3]);
// Finally, execute the update
SqlTools.ExecuteNonQuery(command);
}
private void SaveGroupButton_Click(object sender, EventArgs e)
{
/*
* SaveButton executes the SQL query needed for inserting
* a new Group and its related staff members.
* newGroup defines whether a group is being edited or
* a new group is being created.
*/
if (!newGroup)
{
// Delete all cases of the group beforehand to avoid conflicts.
SqlCommand comm = new SqlCommand("DELETE FROM StaffGroupsLink WHERE GroupId = @GroupId");
comm.Parameters.AddWithValue("@GroupId", groupId);
SqlTools.ExecuteNonQuery(comm);
SqlParameter staffId = new SqlParameter("@StaffId", "");
// Insert the new group-staff links with the selected staff
comm.CommandText = "INSERT INTO StaffGroupsLink (GroupId, StaffId) VALUES (@GroupId, @StaffId)";
comm.Parameters.Add(staffId);
foreach (string o in staffList)
{
// Loop over each Staff ID in the list.
staffId.Value = Staff.GetStaffIdByName(o);
SqlTools.ExecuteNonQuery(comm);
}
// Update with the new subject if changed
comm.CommandText = "UPDATE Groups SET SubjectId = @SubjectId WHERE GroupId = @GroupId";
comm.Parameters.AddWithValue("@SubjectId", Subjects.GetSubjectIdByName(subjectsComboBox.SelectedItem.ToString()));
SqlTools.ExecuteNonQuery(comm);
// Update with the new Academic Year if changed
comm.CommandText = "UPDATE Groups SET AcademicYearId = @AcademicYearId WHERE GroupId = @GroupId";
comm.Parameters.AddWithValue("@AcademicYearId", Groups.GetYearIdByName(academicYearComboBox.SelectedItem.ToString()));
SqlTools.ExecuteNonQuery(comm);
// Repopulate the list with the new group.
AdminForm.RefreshLists();
Close();
}
else
{
// New group
if (groupNameTextBox.Text != "" && academicYearComboBox.SelectedIndex != -1 && subjectsComboBox.SelectedIndex != -1 && lecturerBox.Items.Count != 0)
{
// Insert the parameters into the query.
SqlCommand comm = new SqlCommand("INSERT INTO Groups (GroupName, SubjectId, AcademicYearId) VALUES (@GroupName, @SubjectId, @AcademicYearId)");
comm.Parameters.AddWithValue("@GroupName", groupNameTextBox.Text);
comm.Parameters.AddWithValue("@SubjectId", Subjects.GetSubjectIdByName(subjectsComboBox.SelectedItem.ToString()));
comm.Parameters.AddWithValue("@AcademicYearId", Groups.GetYearIdByName(academicYearComboBox.SelectedItem.ToString()));
SqlTools.ExecuteNonQuery(comm);
SqlParameter StaffId = new SqlParameter("@StaffId", "");
comm.Parameters.Add(StaffId);
// Get the newly created group ID
comm.Parameters.AddWithValue("@GroupId", Groups.GetGroupIdByName(groupNameTextBox.Text));
comm.CommandText = "INSERT INTO StaffGroupsLink (GroupId, StaffId) VALUES (@GroupId, @StaffId)";
foreach (string o in lecturerBox.Items)
{
// Loop through the staff ID's and add them
StaffId.Value = Staff.GetStaffIdByName(o);
SqlTools.ExecuteNonQuery(comm);
}
AdminForm.RefreshLists();
Close();
}
}
}
