OLEDB方式操作oracle数据库

using (OleDbConnection conn = new OleDbConnection(System.Configuration.ConfigurationManager.ConnectionStrings["local_Orcl"].ConnectionString))
            {
                conn.Open();
                using (OleDbCommand cmd = conn.CreateCommand())
                {
                    try
                    {
                        cmd.CommandText = "select * from HLB_HIS_REQUISITION";
                        DataTable dt = null;
                        OleDbDataAdapter adapter = new OleDbDataAdapter();
                        adapter.SelectCommand = cmd;
                        dt = new DataTable();
                        adapter.Fill(dt);
                        cmd.Parameters.Clear();

                        dataGridView1.DataSource = dt;
                    }
                    catch (Exception ee)
                    {
                        MessageBox.Show(ee.Message.ToString() + "\r\n" + ee.StackTrace.ToString());
                        cmd.Dispose();
                        conn.Close();
                        conn.Dispose();
                    }
                }
            }

 using (OleDbConnection conn = new OleDbConnection(System.Configuration.ConfigurationManager.ConnectionStrings["local_Orcl"].ConnectionString))
            {
                conn.Open();
                using (OleDbCommand cmd = conn.CreateCommand())
                {
                    try
                    {
                        cmd.CommandText = "insert into hlb_his_requisition(requisition_id, patient_name, patient_sex, patient_age, patient_bed, charge_name, sample_class, requisition_state)values(1,‘张三‘, 1, 1, 1, 1, 1, 1)";
                        cmd.ExecuteNonQuery();
                    }
                    catch (Exception ee)
                    {
                        MessageBox.Show(ee.Message.ToString() + "\r\n" + ee.StackTrace.ToString());
                        cmd.Dispose();
                        conn.Close();
                        conn.Dispose();
                    }
                }
            }

 <add name="local_Orcl" connectionString="Provider=OraOLEDB.Oracle.1;Data Source=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=192.168.31.11)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=ORCL)));User ID=scott;Password=123;Unicode=True"/>