public List <vech> getAllVechs()
        {
            List <vech>   li  = new List <vech>();
            SQLiteCommand cmd = new SQLiteCommand(m_con);

            cmd.CommandText = "select * from detail";
            SQLiteDataReader dr = cmd.ExecuteReader();
            StringBuilder    sb = new StringBuilder();

            while (dr.Read())
            {
                vech one = new vech();
                one.typeName = dr.GetString(0);
                one.number   = dr.GetString(1);
                one.status   = dr.GetString(2);
                li.Add(one);
            }
            return(li);
        }
        public void deleteVech(vech one)
        {
            string str = "delete from detail where typename=" + "'" + one.typeName + "' and number ='" + one.number + "'";

            excuteCommand(str);
        }
        public void updateVech(vech one)
        {
            string str = "update detail set status ='" + one.status + "' where typeName=" + "'" + one.typeName + "' and number ='" + one.number + "'";

            excuteCommand(str);
        }
        public void insertVech(vech one)
        {
            string str = "insert into detail (typeName, number, status) values ('" + one.typeName + "', '" + one.number + "', '" + one.status + "')";

            excuteCommand(str);
        }