public int AddStudent(Student student)
{
using (var db = new UnivercityContext())
{
try
{
Student newStudent = new Student()
{
Name = student.Name,
Surname = student.Surname,
Age = student.Age,
Sex = student.Sex,
SectionId = student.SectionId,
CurrentClass = student.CurrentClass,
EnrollmentDate = student.EnrollmentDate
};
db.Students.Add(newStudent);
db.SaveChanges();
// while db.saveChanges() newStudent.ID is initialized,
// so we can get it after that.
return newStudent.Id;
}
catch (Exception)
{
return -1;
}
}
}
public int GetCoursesNumber()
{
using (var db = new UnivercityContext())
{
return (from s in db.Courses select s).Count();
}
}
public bool DeleteStudent(int StudentId)
{
using (var db = new UnivercityContext())
{
var student = new Student { Id = StudentId };
db.Students.Attach(student);
db.Students.Remove(student);
db.SaveChanges();
}
return true;
}
public FacultiesList GetFacultiesList()
{
using (var db = new UnivercityContext())
{
FacultiesList list = new FacultiesList();
foreach (var row in db.Faculties)
{
list.Faculties.Add(new Faculty()
{
Id = row.Id,
Title = row.Title
});
}
return list;
}
}
public CoursesList GetCoursesList()
{
using (var db = new UnivercityContext())
{
CoursesList list = new CoursesList();
foreach (var row in db.Courses)
{
list.Courses.Add(new Course()
{
Id = row.Id,
Title = row.Title,
Credits = row.Credits,
SectionId = row.SectionId
});
}
return list;
}
}
public bool TryLogin(string email, string password)
{
using (var db = new UnivercityContext())
{
var query = from t in db.Teachers
where t.Email == email && t.Password == password
select t;
if (query.FirstOrDefault() != null)
return true;
else
return false;
}
}
public bool ModifyStudent(Student std)
{
using (var db = new UnivercityContext())
{
var original = db.Students.Find(std.Id);
if (original != null)
{
original.Name = std.Name;
original.Surname = std.Surname;
original.Age = std.Age;
original.CurrentClass = std.CurrentClass;
original.EnrollmentDate = std.EnrollmentDate;
original.Sex = std.Sex;
db.SaveChanges();
}
// advanced method, but the problems is that i've not managed sectionId
// so that it becomes 0 within this method // todo later --> means UI modif :(
//if (original != null)
//{
// db.Entry(original).CurrentValues.SetValues(std);
// db.SaveChanges();
// return true;
//}
return false;
}
}
public TeachersList GetTeachersList()
{
using (var db = new UnivercityContext())
{
TeachersList list = new TeachersList();
foreach (var row in db.Teachers)
{
list.Teachers.Add(new Teacher()
{
Id = row.Id,
Name = row.Name,
Surname = row.Surname,
Sex = row.Sex,
Age = row.Age,
Grade = row.Grade,
Email = row.Email
});
}
return list;
}
}
public StudentsList GetStudentsList()
{
using (var db = new UnivercityContext())
{
StudentsList list = new StudentsList();
foreach (var row in db.Students)
{
list.Students.Add(new Student()
{
Id = row.Id,
Name = row.Name,
Surname = row.Surname,
Sex = row.Sex,
Age = row.Age,
CurrentClass = row.CurrentClass,
EnrollmentDate = row.EnrollmentDate,
SectionId = row.SectionId
});
}
return list;
}
}
public SectionsList GetSectionsList()
{
using (var db = new UnivercityContext())
{
SectionsList list = new SectionsList();
foreach (var row in db.Sections)
{
list.Sections.Add(new Section()
{
Id = row.Id,
Title = row.Title,
FacultyId = row.FacultyId
});
}
return list;
}
}
