static void TestTransaction()
{
using (var context = new PetDemoEntities(PetDataConnectionStringBuilder.GetConnectionString()))
{
context.Database.Log = Console.Write;
var standard = context.Standards.Add(new Standard()
{
StandardName = "1st Grade"
});
context.Students.Add(new Student()
{
StudentName = "Rama",
StandardId = standard.StandardId
});
context.SaveChanges();
context.Courses.Add(new Course()
{
CourseName = "Computer Science"
});
context.SaveChanges();
}
}
static void TestConcurrency()
{
Student student = null;
using (var context = new PetDemoEntities(PetDataConnectionStringBuilder.GetConnectionString()))
{
student = context.Students.First();
}
//Edit student name
Console.Write("Enter New Student Name:");
student.StudentName = Console.ReadLine(); //Assigns student name from console
using (var context = new PetDemoEntities(PetDataConnectionStringBuilder.GetConnectionString()))
{
try
{
context.Entry(student).State = EntityState.Modified;
context.SaveChanges();
Console.WriteLine("Student saved successfully.");
}
catch (DbUpdateConcurrencyException ex)
{
Console.WriteLine("Concurrency Exception Occurred.");
}
}
}
static void TestSingleTransaction()
{
using (var context = new PetDemoEntities(PetDataConnectionStringBuilder.GetConnectionString()))
{
context.Database.Log = Console.Write;
using (DbContextTransaction transaction = context.Database.BeginTransaction())
{
try
{
var standard = context.Standards.Add(new Standard()
{
StandardName = "1st Grade"
});
context.Students.Add(new Student()
{
StudentName = "Rama2",
StandardId = standard.StandardId
});
context.SaveChanges();
context.Courses.Add(new Course()
{
CourseName = "Computer Science"
});
context.SaveChanges();
transaction.Commit();
}
catch (Exception ex)
{
transaction.Rollback();
Console.WriteLine("Error occurred.");
}
}
}
}
static void TestEnum()
{
Teacher newTeacher = new Teacher();
newTeacher.TeacherName = "Jinpyo Kim";
newTeacher.TeacherType = TeacherType.Contract;
using (var db = new PetDemoEntities(PetDataConnectionStringBuilder.GetConnectionString()))
{
db.Entry(newTeacher).State = newTeacher.TeacherId == 0 ? EntityState.Added : EntityState.Modified;
//db.Teachers.Add(newTeacher);
db.SaveChanges();
}
}