OleDbConnection conn;

        OleDbDataReader reader;       

       

        /// <summary>

        /// 打开数据连接

        /// </summary>

        /// <param name="sql">数据库连接语句</param>

        public void open(String sql)

        {





            conn = new OleDbConnection(sql);          

            conn.Open();

        }

   public bool sql(String sql)

        {

            OleDbCommand comm = new OleDbCommand();

            comm.CommandText = sql;

            comm.Connection = conn;            

            reader=comm.ExecuteReader();

            rd = reader.Read();

            reader.Close();

            return rd;



        }

   public void inquire(Object text)

        {

               

            object lockojb = new object();

            //lock锁

            lock (lockojb)

            {

                //去掉条形码ID的条码号

               // da.open(Class1.strconn);