public void DeleteStudent(int studentId)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var student = con.Students.Where(x => x.StudentId == studentId).FirstOrDefault();
if (student != null) {
con.Students.Remove(student);
con.SaveChanges();
}
}
}
public void DeleteEnrollment(int courseId, int studentId)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var enrollment = con.Enrollments.Where(x => x.CourseId == courseId && x.StudentId == studentId).FirstOrDefault();
if (enrollment != null) {
con.Enrollments.Remove(enrollment);
con.SaveChanges();
}
}
}
public void DeleteCourse(int courseId)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var course = con.Courses.Where(x => x.CourseId == courseId).FirstOrDefault();
if (course != null) {
con.Courses.Remove(course);
con.SaveChanges();
}
}
}
public void DeleteAll()
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var students = con.Students;
if (students != null) {
foreach (var s in students) {
con.Students.Remove(s);
}
con.SaveChanges();
}
}
}
public void AddStudent(StudentData studentData)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var student = new Student {
FirstName = studentData.FirstName,
LastName = studentData.LastName,
DateCreated = studentData.DateCreated
};
con.Students.Add(student);
con.SaveChanges();
}
}
public void DeleteAll()
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var enrollments = con.Enrollments;
if (enrollments != null) {
foreach (var e in enrollments) {
con.Enrollments.Remove(e);
}
con.SaveChanges();
}
}
}
public void AddEnrollment(EnrollmentData enrollmentData)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var enrollment = new Enrollment {
CourseId = enrollmentData.CourseId,
StudentId = enrollmentData.StudentId
};
con.Enrollments.Add(enrollment);
con.SaveChanges();
}
}
public void DeleteAll()
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var courses = con.Courses;
if (courses != null) {
foreach (var c in courses) {
con.Courses.Remove(c);
}
con.SaveChanges();
}
}
}
public void AddCourse(CourseData courseData)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var course = new Course {
Title = courseData.Title,
StartDate = courseData.StartDate,
MaxEnrollmentCount = courseData.MaxEnrollmentCount
};
con.Courses.Add(course);
con.SaveChanges();
}
}
public bool UpdateStudent(StudentData studentData)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var student = con.Students.Where(x => x.StudentId == studentData.StudentId).FirstOrDefault();
if (student != null) {
student.FirstName = studentData.FirstName;
student.LastName = studentData.LastName;
student.DateCreated = studentData.DateCreated;
con.SaveChanges();
return true;
}
}
return false;
}
public bool UpdateEnrollment(EnrollmentData enrollmentData)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var enrollment = con.Enrollments.Where(x => x.EnrollmentId == enrollmentData.EnrollmentId).FirstOrDefault();
if (enrollment != null) {
enrollment.StudentId = enrollmentData.StudentId;
enrollment.CourseId = enrollmentData.CourseId;
con.SaveChanges();
return true;
}
}
return false;
}
public bool UpdateCourse(CourseData courseData)
{
using (KaplanTestPrepEntities con = new KaplanTestPrepEntities()) {
var course = con.Courses.Where(x => x.CourseId == courseData.CourseId).FirstOrDefault();
if (course != null) {
course.Title = courseData.Title;
course.StartDate = courseData.StartDate;
course.MaxEnrollmentCount = courseData.MaxEnrollmentCount;
con.SaveChanges();
return true;
}
}
return false;
}
