public static void UpdateStudent(StudentInfo si)
{
using (SchoolJournalEntities context = new SchoolJournalEntities())
{
Student s = context.Set <Student>().Find(si.StudentID);
if (s == null)
{
throw new ArgumentNullException("StudentID to update cannot be null!");
}
if (!Util.IsValidEmail(si.Email))
{
throw new ArgumentException("Email string is not a valid email!");
}
UsersDAL.UpdateUser(si);
s.DateOfJoin = si.DateOfJoin;
//find grade ID
var gID = (from grade in context.Grades where (grade.GradeNo + grade.Section).Equals(si.GradeName) select grade.GradeID);
if (gID.Count() > 0)
{
s.GradeID = gID.First();
}
else
{
throw new ArgumentException("Invalid grade name!");
}
context.SaveChanges();
}
}
/// <summary>
/// Adds new teacher to the database.
/// </summary>
/// <param name="t"></param>
/// <returns>ID of newly added teacher.</returns>
public static int AddNewTeacher(TeacherInfo t)
{
int userID;
if (!Util.IsValidEmail(t.Email))
{
throw new ArgumentException("Email string is not a valid email!");
}
using (SchoolJournalEntities context = new SchoolJournalEntities())
{
using (var dbContextTransaction = context.Database.BeginTransaction())
{
userID = UsersDAL.AddNewUser(t, dbContextTransaction.UnderlyingTransaction);
context.Teachers.Add(new Teacher
{
TeacherID = userID,
Category = t.Category,
Specialization = t.Specialization
});
context.SaveChanges();
dbContextTransaction.Commit();
}
}
return(userID);
}
public static void UpdateTeacher(TeacherInfo t)
{
if (!Util.IsValidEmail(t.Email))
{
throw new ArgumentException("Email string is not a valid email!");
}
UsersDAL.UpdateUser(t);
using (SchoolJournalEntities context = new SchoolJournalEntities())
{
Teacher teacherToUpdate = context.Set <Teacher>().Find(t.TeacherID);
teacherToUpdate.Specialization = t.Specialization;
teacherToUpdate.Category = t.Category;
context.SaveChanges();
}
}
public static void ShiftAllStudentsToNextGrade()
{
using (SchoolJournalEntities context = new SchoolJournalEntities())
{
using (var dbContextTransaction = context.Database.BeginTransaction())
{
try
{
foreach (Student s in context.Students)
{
//if the current grade is the last one, the student is deleted!
int nextGradeID = GetNextGradeID(s.GradeID);
if (nextGradeID == -1) //delete student from school
{
UsersDAL.DeleteUser(s.StudentID);
}
else
{
s.GradeID = nextGradeID;
}
}
foreach (Group g in context.Groups)
{
int nextGradeID = GetNextGradeID(g.GradeID);
if (nextGradeID == -1) //delete student from school
{
context.Groups.Remove(g);
}
else
{
g.GradeID = nextGradeID;
}
}
context.SaveChanges();
dbContextTransaction.Commit();
}
catch (Exception ex)
{
dbContextTransaction.Rollback();
throw ex;
}
}
}
}
