public void DeleteStudent()
{
int idToBeDeleted = idInput("of the student to be deleted");
using (StudentiEntities studentiEntities = new StudentiEntities())
{
Studenti studentToBeDeleted = studentiEntities.Studenti.FirstOrDefault(s => s.Id == idToBeDeleted);
if (studentToBeDeleted != null)
{
IEnumerable <Predmeti> predmetis =
from Predmeti in studentiEntities.Predmeti
select Predmeti;
foreach (Predmeti predmet in predmetis)
{
if (predmet.Studenti.Contains(studentToBeDeleted))
{
predmet.Studenti.Remove(studentToBeDeleted);
}
}
studentiEntities.Studenti.Remove(studentToBeDeleted);
studentiEntities.SaveChanges();
}
else if (studentToBeDeleted == null)
{
Console.WriteLine("Student with given id does not exist!");
}
}
}
public void updateStudentInfo()
{
int idToBeUpdated = idInput("of the student to be updated");
string firstNameUpdated, LastNameUpdated;
using (StudentiEntities studentiEntities = new StudentiEntities())
{
Studenti studentToBeUpdated = studentiEntities.Studenti.FirstOrDefault(s => s.Id == idToBeUpdated);
if (studentToBeUpdated != null)
{
Console.WriteLine("Please insert the student's new name");
firstNameUpdated = Console.ReadLine().Trim();
Console.WriteLine("Please insert the student's new last name");
LastNameUpdated = Console.ReadLine().Trim();
studentToBeUpdated.Ime = firstNameUpdated;
studentToBeUpdated.Prezime = LastNameUpdated;
studentiEntities.SaveChanges();
}
else if (studentToBeUpdated == null)
{
Console.WriteLine("Student with given id does not exist!");
}
}
}
public void removeCourse()
{
int idToBeDeleted = idInput("of the student to be deleted");
using (StudentiEntities studentiEntities = new StudentiEntities())
{
Predmeti courseToBeDeleted = studentiEntities.Predmeti.FirstOrDefault(c => c.Id == idToBeDeleted);
if (courseToBeDeleted != null)
{
IEnumerable <Studenti> studentis =
from Studenti in studentiEntities.Studenti
select Studenti;
foreach (Studenti student in studentis)
{
if (student.Predmeti.Contains(courseToBeDeleted))
{
student.Predmeti.Remove(courseToBeDeleted);
}
}
studentiEntities.Predmeti.Remove(courseToBeDeleted);
studentiEntities.SaveChanges();
}
else
{
Console.WriteLine("Course with given ID does not exist!");
}
}
}
public void updateStudentCourses()
{
int studentId, subjectId;
string addOrRemoveCourses;
studentId = idInput("of the student to be updated");
while (true)
{
Console.WriteLine("Enter 1 to remove courses, enter 2 to add courses");
addOrRemoveCourses = Console.ReadLine().Trim();
if (addOrRemoveCourses == "1" || addOrRemoveCourses == "2")
{
break;
}
}
subjectId = idInput("of the subject");
using (StudentiEntities studentiEntities = new StudentiEntities())
{
bool idExists = false;
Studenti studentToBeUpdated = studentiEntities.Studenti.FirstOrDefault(s => s.Id == studentId);
Predmeti subjectToBeAddedOrRemoved = studentiEntities.Predmeti.FirstOrDefault(p => p.Id == subjectId);
if (studentToBeUpdated != null && subjectToBeAddedOrRemoved != null)
{
idExists = true;
}
if (addOrRemoveCourses == "1" && idExists)
{
studentToBeUpdated.Predmeti.Remove(subjectToBeAddedOrRemoved);
subjectToBeAddedOrRemoved.Studenti.Remove(studentToBeUpdated);
studentiEntities.SaveChanges();
}
else if (addOrRemoveCourses == "2" && idExists)
{
studentToBeUpdated.Predmeti.Add(subjectToBeAddedOrRemoved);
subjectToBeAddedOrRemoved.Studenti.Add(studentToBeUpdated);
studentiEntities.SaveChanges();
}
if (!idExists)
{
Console.WriteLine("Invalid IDs!");
}
}
}
public void addNewCourse()
{
Predmeti newCourse = new Predmeti();
Console.WriteLine("Please insert the new subject name");
newCourse.Naziv = Console.ReadLine().Trim();
using (StudentiEntities studentiEntities = new StudentiEntities())
{
studentiEntities.Predmeti.Add(newCourse);
studentiEntities.SaveChanges();
}
}
public void AddNewStudent()
{
Studenti newStudent = new Studenti();
Console.WriteLine("Please insert the new student's name");
newStudent.Ime = Console.ReadLine().Trim();
Console.WriteLine("Please insert the new student's last name");
newStudent.Prezime = Console.ReadLine().Trim();
using (StudentiEntities studentiEntities = new StudentiEntities())
{
studentiEntities.Studenti.Add(newStudent);
studentiEntities.SaveChanges();
}
}
public void showAllCoursesEndrolled()
{
using (StudentiEntities studentiEntities = new StudentiEntities())
{
IEnumerable <Predmeti> predmetis =
from Predmeti in studentiEntities.Predmeti
select Predmeti;
foreach (Predmeti predmet in predmetis)
{
Console.WriteLine("subject: ID:" + predmet.Id + " Name: " + predmet.Naziv);
foreach (Studenti student in predmet.Studenti)
{
Console.WriteLine("Student: ID:" + student.Id + " First Name: " + student.Ime.Trim() + " Last Name: " + student.Prezime + " ");
}
Console.WriteLine();
}
}
}
public void updateCourse()
{
int idToBeUpdated = idInput("of the course to be updated");
string nameUpdated;
Console.WriteLine("Please insert the new course name");
nameUpdated = Console.ReadLine().Trim();
using (StudentiEntities studentiEntities = new StudentiEntities())
{
Predmeti courseToBeUpdated = studentiEntities.Predmeti.FirstOrDefault(c => c.Id == idToBeUpdated);
if (courseToBeUpdated != default)
{
courseToBeUpdated.Naziv = nameUpdated;
studentiEntities.SaveChanges();
}
else
{
Console.WriteLine("Course with given Id does not exist!");
}
}
}
