private void deleteSubjectButton_Click(object sender, EventArgs e)
{
string selectedGroup = (string)subjectsListBox.SelectedItem;
SqlCommand comm = new SqlCommand("SELECT COUNT(*) FROM Groups WHERE SubjectId = @SubjectId");
comm.Parameters.AddWithValue("@SubjectId", Subjects.GetSubjectIdByName(selectedGroup));
int groupsAffected = SqlTools.ExecuteScalar(comm);
// Create a simple MessageBox for admin confirmation.
DialogResult dialogResult = MessageBox.Show("Are you sure you want to delete the selected subject?\r\n" +
groupsAffected + " groups will be deleted!",
"Delete subject",
MessageBoxButtons.YesNo,
MessageBoxIcon.Warning);
switch (dialogResult)
{
case DialogResult.Yes:
Subjects.DeleteSubject(selectedGroup);
break;
default:
// Do nothing
break;
}
}
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();
}
}
}