Create Program.cs

Author: alexkeh

session-demos/2019/oow/get-started/Program.cs

@@ -0,0 +1,154 @@
+/* Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved. */
+
+/******************************************************************************
+ *
+ * You may not use the identified files except in compliance with The MIT
+ * License (the "License.")
+ *
+ * You may obtain a copy of the License at
+ * https://github.com/oracle/Oracle.NET/blob/master/LICENSE
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *****************************************************************************/
+
+using System;
+using Oracle.ManagedDataAccess.Client;
+using Oracle.ManagedDataAccess.Types;
+using System.Data;
+
+namespace GetStartedODPNETCore
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+
+            //Demo: Basic ODP.NET Core application to connect, query, and return
+            // results from an OracleDataReader to a console
+
+            //Enter user name and password			
+            string conString = "User Id=hr;Password=<password>;" +
+            
+            //Connect to an Oracle DB with Easy Connect (Plus) or a net service name
+            "Data Source=<Easy Connect (Plus) or net service name>;";
+
+            using (OracleConnection con = new OracleConnection(conString))
+            {
+                using (OracleCommand cmd = con.CreateCommand())
+                {
+                    try
+                    {
+                        con.Open();
+                        cmd.BindByName = true;
+
+                        //Use the command to display employee names from the EMPLOYEES table
+                        cmd.CommandText = "select first_name from employees where department_id = :id";
+
+                        //Assign id to the department number 20 
+                        OracleParameter id = new OracleParameter("id", 20);
+                        cmd.Parameters.Add(id);
+
+                        //Execute the command and use DataReader to display the data
+                        OracleDataReader reader = cmd.ExecuteReader();
+                        while (reader.Read())
+                        {
+                            Console.WriteLine("Employee First Name: " + reader.GetString(0));
+                        }
+
+                        id.Dispose();
+                        reader.Dispose();
+                        Console.WriteLine();
+
+                        //Demo: Batch SQL and REF Cursors
+                        // Anonymous PL/SQL block embedded in code - executes in one DB round trip
+
+                        //Reset OracleCommand for use in next demo
+                        cmd.Parameters.Clear();
+                        cmd.BindByName = false;
+
+                        cmd.CommandText = "DECLARE a NUMBER:= 20; " +
+                          "BEGIN " +
+                          "OPEN :1 for select first_name,department_id from employees where department_id = 10; " +
+                          "OPEN :2 for select first_name,department_id from employees where department_id = a; " +
+                          "OPEN :3 for select first_name,department_id from employees where department_id = 30; " +
+                          "END;";
+
+                        cmd.CommandType = CommandType.Text;
+
+                        //ODP.NET has native Oracle data types, such as Oracle REF 
+                        // Cursors, which can be mapped to .NET data types
+
+                        //Bind REF Cursor Parameters for each department
+                        //Select employees in department 10
+                        OracleParameter p1 = cmd.Parameters.Add("refcursor1",
+                          OracleDbType.RefCursor);
+                        p1.Direction = ParameterDirection.Output;
+
+                        //Select employees in department 20
+                        OracleParameter p2 = cmd.Parameters.Add("refcursor2",
+                          OracleDbType.RefCursor);
+                        p2.Direction = ParameterDirection.Output;
+
+                        //Select employees in department 30
+                        OracleParameter p3 = cmd.Parameters.Add("refcursor3",
+                          OracleDbType.RefCursor);
+                        p3.Direction = ParameterDirection.Output;
+
+                        //Execute batched statement
+                        cmd.ExecuteNonQuery();
+
+                        //Let's retrieve the three result sets with DataReaders
+                        OracleDataReader dr1 =
+                          ((OracleRefCursor)cmd.Parameters[0].Value).GetDataReader();
+                        OracleDataReader dr2 =
+                          ((OracleRefCursor)cmd.Parameters[1].Value).GetDataReader();
+                        OracleDataReader dr3 =
+                          ((OracleRefCursor)cmd.Parameters[2].Value).GetDataReader();
+
+                        //Let's retrieve the results from the DataReaders
+                        while (dr1.Read())
+                        {
+                            Console.WriteLine("Employee Name: " + dr1.GetString(0) + ", " +
+                              "Employee Dept:" + dr1.GetDecimal(1));
+                        }
+                        Console.WriteLine();
+
+                        while (dr2.Read())
+                        {
+                            Console.WriteLine("Employee Name: " + dr2.GetString(0) + ", " +
+                              "Employee Dept:" + dr2.GetDecimal(1));
+                        }
+                        Console.WriteLine();
+
+                        while (dr3.Read())
+                        {
+                            Console.WriteLine("Employee Name: " + dr3.GetString(0) + ", " +
+                              "Employee Dept:" + dr3.GetDecimal(1));
+                        }
+
+                        //Clean up
+                        p1.Dispose();
+                        p2.Dispose();
+                        p3.Dispose();
+                        dr1.Dispose();
+                        dr2.Dispose();
+                        dr3.Dispose();
+
+                        Console.WriteLine("Press 'Enter' to continue");
+                    }
+                    catch (Exception ex)
+                    {
+                        Console.WriteLine(ex.Message);
+                    }
+                    Console.ReadLine();
+                }
+            }
+        }
+    }
+}