public void StartOwnTransactionWithinContext()
{
using (var ctx = new tect_CodeFirstContext())
{
using (var dbContextTransaction = ctx.Database.BeginTransaction())
{
try
{
var lecturerList = ctx.lecturers.ToList <lecturer>();
//Perform create operation
Console.WriteLine("Perform create operation");
ctx.lecturers.Add(new lecturer()
{
lc_id = "L_2", lc_fname = "Second lecturer"
});
//Execute Inser, Update & Delete queries in the database
ctx.SaveChanges();
var lects1 = ctx.lecturers.ToList <lecturer>();
//Perform Update operation
Console.WriteLine("Perform Update operation");
var lecturerList1 = ctx.lecturers.ToList <lecturer>();
lecturer lecturerToUpdate = lecturerList1.Where(s => s.lc_fname == "Second lecturer").FirstOrDefault <lecturer>();
lecturerToUpdate.lc_fname = "Edited second lecturer";
//Execute Inser, Update & Delete queries in the database
ctx.SaveChanges();
dbContextTransaction.Commit();
}
catch (Exception) { dbContextTransaction.Rollback(); }
}
}
}
static void Main(string[] args)
{
using (var ctx = new tect_CodeFirstContext())
{
try
{
try {
ctx.lecturers.Remove(ctx.lecturers.ToList <lecturer>().ElementAt(0));
ctx.SaveChanges();
}
catch (Exception ex) {
Console.WriteLine(ex.Message);
}
var lecturerList = ctx.lecturers.ToList <lecturer>();
//Perform create operation
Console.WriteLine("Perform create operation");
ctx.lecturers.Add(new lecturer()
{
lc_id = "L_1",
lc_fname = "New lecturer"
});
//Execute Insert, Update & Delete queries in the database
ctx.SaveChanges();
var lects1 = ctx.lecturers.ToList <lecturer>();
Lecturers_print(lects1);
//Perform Update operation
Console.WriteLine("Perform Update operation");
var lecturerList1 = ctx.lecturers.ToList <lecturer>();
lecturer lecturerToUpdate = lecturerList1.Where(s => s.lc_fname == "New lecturer").FirstOrDefault <lecturer>();
lecturerToUpdate.lc_fname = "Edited lecturer";
//Execute Insert, Update & Delete queries in the database
ctx.SaveChanges();
lects1 = ctx.lecturers.ToList <lecturer>();
Lecturers_print(lects1);
Console.WriteLine();
SQL_qry(ctx);
Console.WriteLine();
Console.WriteLine("Transaction example");
Transaction_test tr = new Transaction_test();
tr.StartOwnTransactionWithinContext();
lects1 = ctx.lecturers.ToList <lecturer>(); Lecturers_print(lects1);
//Perform delete operation, re-read lecturers list
Console.WriteLine("Perform delete operation");
lecturerList1 = ctx.lecturers.ToList <lecturer>();
ctx.lecturers.Remove(lecturerList1.ElementAt <lecturer>(0));
ctx.lecturers.Remove(lecturerList1.Where(s => s.lc_fname == "Edited second lecturer").FirstOrDefault <lecturer>());
//Execute Insert, Update & Delete queries in the database
ctx.SaveChanges();
lects1 = ctx.lecturers.ToList <lecturer>(); Lecturers_print(lects1);
}
catch (Exception ex) { Console.WriteLine(ex.Message); }
Console.ReadKey();
}
}
