public bool SaveStudent(StudentDTO dto)
{
using (var ctx = new SMSContext())
{
if (dto.StudentID > 0)
{
//Update
var query = from p in ctx.Students
where p.StudentID == dto.StudentID
select p;
//Now query will be executed on DB and will return result
var result = query.FirstOrDefault();
if (result != null)
{
result.StudentName = dto.StudentName;
result.FatherName = dto.FatherName;
}
}
else
{
ctx.Students.Add(dto);
}
ctx.SaveChanges();
}
return true;
}
public StudentDTO GetById(int id)
{
using (var ctx = new SMSContext())
{
return ctx.Students.Where(p => p.StudentID == id).FirstOrDefault();
}
}
public bool SaveTeacher(TeacherDTO dto)
{
using (var ctx = new SMSContext())
{
if (dto.TID > 0)
{
//Update
var query = from p in ctx.Teachers
where p.TID == dto.TID
select p;
//Now query will be executed on DB and will return result
var result = query.FirstOrDefault();
if (result != null)
{
result.Name = dto.Name;
result.Subject = dto.Subject;
}
}
else
{
ctx.Teachers.Add(dto);
}
ctx.SaveChanges();
}
return true;
}
public TeacherDTO GetById(int id)
{
using (var ctx = new SMSContext())
{
return ctx.Teachers.Where(p => p.TID == id).FirstOrDefault();
}
}
public void RemoveById(int id)
{
using (var ctx = new SMSContext())
{
var result = ctx.Students.Where(p => p.StudentID == id).FirstOrDefault();
if (result != null)
{
ctx.Students.Remove(result);
ctx.SaveChanges();
}
}
}
public void RemoveById(int id)
{
using (var ctx = new SMSContext())
{
var result = ctx.Teachers.Where(p => p.TID == id).FirstOrDefault();
if (result != null)
{
ctx.Teachers.Remove(result);
ctx.SaveChanges();
}
}
}
public List <TeacherDTO> GetAll()
{
using (var ctx = new SMSContext())
{
//ToList()
//First()
//FirstOrDefault();
//Single()
//SignleOrDefualt();
return(ctx.Teachers.ToList());
}
}
public List<StudentDTO> GetAll()
{
using (var ctx = new SMSContext())
{
//ToList()
//First()
//FirstOrDefault();
//Single()
//SignleOrDefualt();
return ctx.Students.ToList();
}
}
public List <Users> GetAllUsers()
{
//Using handles the disposal by itself
using (var ctx = new SMSContext())
{
//LINQ builder approach
var list = ctx.Users.ToList();
/*
* var query = from p in ctx.Users
* select p;
*
* var list = query.ToList();
*/
return(list);
}
}
public bool VerifyLogin(String Login, String Password)
{
using (var ctx = new SMSContext())
{
var query = from p in ctx.Users
where p.Login == Login && p.Password == Password
select p;
var cnt = query.Count();
if (cnt > 0)
{
return(true);
}
else
{
return(false);
}
}
}
public Users GetUserById(int userid)
{
using (var ctx = new SMSContext())
{
//LINQ to Entities approach
//This is just query object in memory
var query = from p in ctx.Users
where p.UserID == userid
select p;
//Now query will be executed on DB and will return result
var result = query.FirstOrDefault();
//ctx.Users.Where(p => p.UserID == userid).FirstOrDefault();
return(result);
}
}
public bool DeleteUserById(int userid)
{
using (var ctx = new SMSContext())
{
//LINQ to Entities approach
//This is just query object in memory
var query = from p in ctx.Users
where p.UserID == userid
select p;
//Now query will be executed on DB and will return result
var result = query.FirstOrDefault();
if (result != null)
{
ctx.Users.Remove(result);
ctx.SaveChanges();
}
return(true);
}
}