/// <summary>
/// Add random value in table Journal
/// </summary>
/// <param name="db">DbContext</param>
/// <param name="count">Count</param>
public static void AddJournal(Academy db, int count, int minRating, int maxRating)
{
var sList = db.Students.ToList();
var dList = db.Disciplines.ToList();
for (int i = 0; i < count; i++)
{
db.Journal.Add(new Journal()
{
StudentId = sList[rand.Next(sList.Count)].Id,
DisciplineId = dList[rand.Next(dList.Count)].Id,
Rating = rand.Next(minRating, maxRating),
Moment = new DateTime(2020, 01, rand.Next(1, 32), rand.Next(8, 16), rand.Next(60), rand.Next(60))
});
}
}
/// <summary>
/// Add random names in table Students
/// </summary>
/// <param name="db">DbContext</param>
/// <param name="count">Count</param>
public static void AddStudents(Academy db, int count)
{
SqlConnection connection = new SqlConnection(@"Data Source=(LocalDB)\MSSQLLocalDB;Initial Catalog=RandomDB;Integrated Security=True;");
connection.Open();
SqlCommand cmd = new SqlCommand("select Name from Names order by newid()", connection);
for (int i = 0; i < count; i++)
{
db.Students.Add(new Student()
{
Name = (string)cmd.ExecuteScalar()
});
}
connection.Close();
}
static void Main()
{
//-----------------------------------------------------------------
Academy db = new Academy("DefaultConnection");
//-----------------------------------------------------------------
//-----------------------------------------------------------------
//Insert.AddStudents(db, 50);
//Insert.AddDisciplines(db);
//Insert.AddJournal(db, 10000, 5, 12);
//db.SaveChanges();
//-----------------------------------------------------------------
//-------------------------------------------
int top = EnterInt("Top");
//-------------------------------------------
var q = from j in db.Journal
join s in db.Students on j.StudentId equals s.Id
join d in db.Disciplines on j.DisciplineId equals d.Id
select new { j, s, d };
PrintTake();
//-------------------------------------------
int jId = EnterInt("JId");
Journal jItem = db.Journal.Find(jId);
if (jItem == null)
{
Console.WriteLine("Not found");
}
else
{
db.Journal.Remove(jItem);
db.SaveChanges();
PrintTake();
}
//-------------------------------------------
int sId = EnterInt("SId");
Student sItem = db.Students.Find(sId);
if (sItem == null)
{
Console.WriteLine("Not found");
}
else
{
Console.Write("New name: ");
sItem.Name = Console.ReadLine();
db.SaveChanges();
PrintWhere();
}
//-------------------------------------------
//-----------------------------------------------------------------
Console.WriteLine(new string('-', 64));
Console.WriteLine($"Students: {db.Students.Count()}");
Console.WriteLine($"Disciplines: {db.Disciplines.Count()}");
Console.WriteLine($"Journal: {db.Journal.Count()}");
//-----------------------------------------------------------------
//-----------------------------------------------------------------
db.Dispose();
Console.ReadKey();
//-----------------------------------------------------------------
//-------------------------------------------
void Print(dynamic a)
{
Console.WriteLine("JId [" + $"{a.j.Id}".PadLeft(5, '0') + "]".PadRight(8)
+ "SId [" + $"{a.s.Id}".PadLeft(3, '0') + "]".PadRight(8)
+ $"{a.s.Name}".PadRight(12)
+ $"{a.d.Title}".PadRight(24)
+ $"{a.j.Rating}".PadLeft(2, '0'));
}
//-------------------------------------------
void PrintTake()
{
Console.WriteLine();
foreach (var a in q.Take(top))
{
Print(a);
}
}
//-------------------------------------------
void PrintWhere()
{
Console.WriteLine();
foreach (var a in q.Where(a => a.s.Id == sId))
{
Print(a);
}
}
//-------------------------------------------
}
