using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        DB1 db = new DB1();

        db.GetEq<TableA>(0,11111);

        db.GetEq<TableA>(1,11111,22222);

        db.GetEq<TableA>(2,11111,"Memo");

        DB2 db2 = new DB2();

        db2.GetEq<TableA>(0,11111);

        db2.GetEq<TableA>(1,11111,22222);

        db2.GetEq<TableA>(2,11111,22222,33333);

    }

    public class TableA

    {

        public string Name {get;set;}

    }

    public abstract class CommonDB

    {

        protected abstract object GetQueryParam(int index , params object[] values);

        public T GetEq<T>(int queryIndex , params object[] values) where T:class

        {

            var paramObject =  GetQueryParam(queryIndex , values);

            Console.WriteLine(paramObject);

            return (Activator.CreateInstance(typeof(T))) as T;

        }

    }

    public class DB1 : CommonDB

    {

        protected override object GetQueryParam(int index , params object[] values)

        {

            switch(index)

            {

                case 0 :

                    return new {Mitsumori = values[0]};

                case 1 :

                    return new {Mitsumori = values[0] , Hanbai = values[1]};

                case 2 :

                    return new {Mitsumori = values[0] , Memo = values[1]};

                default :

                    throw new Exception("exception");

            }

        }

    }

    public class DB2 : CommonDB

    {

        protected override object GetQueryParam(int index , params object[] values)

        {

            switch(index)

            {

                case 0 :

                    return new {Mitsumori2 = values[0]};

                case 1 :

                    return new {Mitsumori2 = values[0] , Hanbai2 = values[1]};

                case 2 :

                    if(values.Length != 3) throw new Exception("invalid param");

                    return new {Mitsumori2 = values[0] , Hanbai2 = values[1] , Kouzi2 = values[2]};

                default :

                    throw new Exception("exception");

            }

        }

    }

}