private void btn_Edit_Click(object sender, EventArgs e)
{
student = new Student();
try
{
//Checks if the ID number exists in the database
if (db.SearchStudentID((int.Parse(txtBox_ID.Text))) == false)
{
MessageBox.Show("Please input an existing student ID number.", "COA Registration System", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
else
{
Form_RegistrantProfile registrant = new Form_RegistrantProfile((uint.Parse(txtBox_ID.Text)));
this.Hide();
registrant.ShowDialog();
}
}
catch (Exception)
{
//Will usually show if the inputted ID number is not a positive integer
//Will also appear on other kinds of errors
MessageBox.Show("Please input a valid ID Number.", "COA Registration System", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
this.Show();
}
public Registration_Form()
{
InitializeComponent();
db = new DBFunction();
student = new Student();
su = new StringUtil();
enterBtnPress = false;
}
private void txtBox_ID_Enter(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.Enter)
{
student = db.GetOldStudentData(int.Parse(txtBox_ID.Text));
label_name.Text = student.FullName;
//Added one since this was last year's database
int year = int.Parse(student.Level) + 1;
student.Level = year.ToString();
label_YrCourse.Text = String.Format(student.Level + " - " + student.Course);
enterBtnPress = true;
}
else
{
enterBtnPress = false;
}
}
//Searches ID number if it exist in the database
//Old DB
public Boolean SearchStudentID(int idNum)
{
student = new Student();
myConn = ConnectToDatabase();
//Makes a MySQL query
string cmd = "SELECT student_id FROM coa.old_student_t WHERE student_id = @StudentID";
//Passes the command into the database connection
MySqlCommand SelectCommand = new MySqlCommand(cmd, myConn);
//To prevent SQL Injections, it would consider 'idNum' as a paramater
SelectCommand.Parameters.AddWithValue("@StudentID", idNum);
try
{
myConn.Open();
myReader = SelectCommand.ExecuteReader();
while (myReader.Read())
{
try { student.StudentID = myReader.GetUInt16(0); }
catch (InvalidCastException) { }
}
if (myReader.FieldCount > 0)
{
return true;
}
else
{
return false;
}
}
catch (Exception)
{
return false;
}
}
//Gets the Student's data from the old DB
public Student GetOldStudentData(int idNum)
{
student = new Student(idNum);
myConn = ConnectToDatabase();
//Makes a MySQL query
string cmd = "SELECT * FROM coa.old_student_t WHERE student_id = @StudentID";
//Passes the command into the database connection
MySqlCommand SelectCommand = new MySqlCommand(cmd, myConn);
//To prevent SQL Injections, it would consider 'idNum' as a paramater
SelectCommand.Parameters.AddWithValue("@StudentID", idNum);
try
{
myConn.Open();
myReader = SelectCommand.ExecuteReader();
while (myReader.Read())
{
try { student.StudentID = myReader.GetInt32(0); }
catch (InvalidCastException) { }
try { student.FullName = myReader.IsDBNull(1) ? null : myReader.GetString(1); }
catch (InvalidCastException) { }
try { student.Level = myReader.IsDBNull(2) ? null : myReader.GetString(2); }
catch (InvalidCastException) { }
try { student.Course = myReader.IsDBNull(3) ? null : myReader.GetString(3); }
catch (InvalidCastException) { }
}
}
catch (Exception)
{
return null;
}
myConn.Close();
return student;
}
//New DB
public Student EditStudent(int idNum)
{
student = new Student(idNum);
try
{
}
catch (Exception)
{
}
return student;
}