Diplom_O/DataBase/RabotnikTypeStajDB.cs

using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Diplom_O.DataBase
{
  public class RabotnikTypeStaj
  {
		public int Id { get; set; }
		[ForeignKey("Rabotnik")]
		public int RabitnikId { get; set; }
		[ForeignKey("TypeStaj")]
		public int TypeStajId { get; set; }
	}
	public static partial class FuncDB
	{
		public static void RabotnikTypeStajCheckValid(RabotnikTypeStaj obj)
		{
			try
			{
				if (obj == null)
					throw new Exception("Ошибка инициализации стажа сотрудника.");
			}
			catch
			{
				throw;
			}
		}
		public static RabotnikTypeStaj RabotnikTypeStajGetById(int id)
		{
			try
			{
				using (var db = new MainDB())
				{
					var res =
						from a in db.RabotnikTypeStajy
						where a.Id == id
						select a;
					try
					{
						return res.Single();
					}
					catch
					{
						return null;
					}
				}
			}
			catch
			{
				throw;
			}
		}
		public static RabotnikTypeStaj RabotnikTypeStajGetByTypeStajIdRabotnikId(int typeStajId, int rabotnikId)
		{
			try
			{
				using (var db = new MainDB())
				{
					var res =
						from a in db.RabotnikTypeStajy
						where a.RabitnikId == rabotnikId &&
						a.TypeStajId == typeStajId
						select a;
					try
					{
						return res.Single();
					}
					catch
					{
						return null;
					}
				}
			}
			catch
			{
				throw;
			}
		}

		public static void RabotnikTypeStajAdd(RabotnikTypeStaj obj)
		{
			try
			{
				RabotnikTypeStajCheckValid(obj);
				if (RabotnikTypeStajGetByTypeStajIdRabotnikId(obj.TypeStajId, obj.RabitnikId) != null )
					throw new Exception("Тип стажа сотрудника существует.");
				using (var db = new MainDB())
				{
					db.RabotnikTypeStajy.Add(obj);
					db.SaveChanges();
				}
			}
			catch
			{
				throw;
			}
		}
		public static void RabotnikTypeStajDelete(RabotnikTypeStaj obj)
		{
			try
			{
				if (obj == null)
					return;
				var localObj = RabotnikTypeStajGetById(obj.Id);
				if (localObj == null)
					throw new Exception("Тип стажа сотрудника не существует.");
				using (var db = new MainDB())
				{
					db.RabotnikTypeStajy.Remove(localObj);
					db.SaveChanges();
				}
			}
			catch
			{
				throw;
			}
		}

		public static RabotnikTypeStaj[] RabotnikTypeStajList(int rabId)
		{
			try
			{
				using (var db = new MainDB())
				{
					var res = (
						from a in db.RabotnikTypeStajy
						where a.RabitnikId == rabId
						select a
						).ToList();
					return res.ToArray();
				}
			}
			catch
			{
				throw;
			}
		}
		public static string[][] RabotnikTypeStajListString(int rabId)
		{
			try
			{
				var rts = RabotnikTypeStajList(rabId);
				var res = new List<string[]>();
				foreach (var r in rts)
        {
					res.Add(
						new string[]
            {
							r.Id.ToString(),
							TypeStajGetById(r.TypeStajId).Name
            }
					);
        }
				return res.ToArray();
			}
			catch
			{
				throw;
			}
		}

		public static RabotnikTypeStaj[] RabotnikTypeStajListByTypeStaj(int typeStaj)
		{
			try
			{
				using (var db = new MainDB())
				{
					var res = (
						from a in db.RabotnikTypeStajy
						where a.TypeStajId == typeStaj
						select a
						).ToList();
					return res.ToArray();
				}
			}
			catch
			{
				throw;
			}
		}


	}
}