using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using WeighBusiness.BO;
using WeighBusiness.Utils;
using WeighBusiness.Utils.SqlUtils;

namespace WeighBusiness.BL
{
	public static class EntityBL
	{
		public static T LoadMinDmo<T>(string tableName, long id)
			where T : Entity, new()
		{
			const string querySql = "select RowVersion from {0} where id={1}";
			var sql = querySql.FormatWith(tableName, id);
			var rowVersion = SqlHelperEx.DoQuery<int>(sql, obj => (int)obj);
			return new T() { ID = id, RowVersion = rowVersion };
		}

		public static bool EnsureStateSame<T>(T dmo)
			where T : Entity, new()
		{
			var minDmo = LoadMinDmo<T>(dmo.TableName, dmo.ID);
			return minDmo.RowVersion == dmo.RowVersion;
		}

	}
}