连接的是 Oracle11，使用微软自带的  using System.Data.OracleClient; 我使用 toad 插入几条测试数据，并在toad使用 select 查询能看到新增记录，但使用winform查询却是空集，如果使用 toad 更改对应表的字段名称再用winform查询就能看到刚才新增的记录，是不是缓存之类的原因作怪呢？

       private void button1_Click(object sender, EventArgs e)

        {         

             string connString = @"Data Source=(DESCRIPTION= (ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.8.99 )(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=test)));User Id=test ;Password=test"; 



             OracleConnection conn = new OracleConnection(connString);

             DataTable dt = ExecuteDataTable(connString, "select * from t1");



             dataGridView1.DataSource = dt;

             dataGridView1.Show();

        }





        DataTable ExecuteDataTable(string connstr, string cmdText, params OracleParameter[] commandParameters)

        {

            OracleCommand command = new OracleCommand();

            OracleConnection connection = new OracleConnection(connstr);

            DataTable table = null;



            try

            {

                PrepareCommand(command, connection, null, CommandType.Text, cmdText, commandParameters);

                OracleDataAdapter adapter = new OracleDataAdapter();

                adapter.SelectCommand = command;

                table = new DataTable();

                adapter.Fill(table);

                int rrr = table.Rows.Count;

                command.Parameters.Clear();

            }

            catch

            {

                throw;

            }

            finally

            {

                command.Dispose();

                connection.Close();

                connection.Dispose();

            }



            return table;

        }