OracleOnsServerCollection Class

6.21 OracleOnsServerCollection Class

The OracleOnsServerCollection class supports adding to and deleting from a collection of logical servers with their corresponding list of nodes where the Oracle Notification Service (ONS) daemons are talking to their remote clients.

In case of remote configuration, the application has to specify the <host>:<port> values for every potential database that it can connect to. The <host>:<port> value pairs represent the ports on the different nodes.

Class Inheritance

System.Object

Oracle.ManagedDataAccess.Client.OracleOnsServerCollection

Declaration

// C#
public static class OracleOnsServerCollection

Requirements

Provider	ODP.NET Core
Assembly	`Oracle.ManagedDataAccess.dll`
Namespace	`Oracle.ManagedDataAccess.Client`
.NET Core	2.1 or higher

Thread Safety

All public static methods are thread-safe, although instance methods do not guarantee thread safety.

Example

using System;
using Oracle.ManagedDataAccess.Client;

namespace NetCoreApp
{
  class OnsServersExample
  {
    static void Main(string[] args)
    {
      // Example to configure ONS Servers for the ODP.NET Core provider.

      // Add server through Add method on OracleOnsServerCollection
      OracleConfiguration.OracleOnsServers.Add("db1", "nodeList=host1:port1, host2:port2, host3:port3");

      // Add server through indexer method on OracleOnsServerCollection
      OracleConfiguration.OracleOnsServers["db2"] = "nodeList=m1:p1, m2:p2";

      // Get number of servers configured
      int numServers = OracleConfiguration.OracleOnsServers.Count;

      // Get OracleOnsServerCollection object
      OracleOnsServerCollection serverColl = OracleConfiguration.OracleOnsServers;

      // Add server through Add method on OracleOnsServerCollection
      serverColl.Add("db3", "nodeList=host1:port1, host2:port2, host3:port3");

      // Add server through indexer method on OracleOnsServerCollection
      serverColl["db4"] = "nodeList=m1:p1, m2:p2";

      // Remove a server
      OracleConfiguration.OracleOnsServers.Remove("db2");

      // Get number of servers configured
      numServers = OracleConfiguration.OracleOnsServers.Count;

      // Get value corresponding to a server.
      string serverVal = OracleConfiguration.OracleOnsServers["db1"];

      OracleConnection orclCon = null;

      try
      {
        // Open a test connection
        orclCon = new OracleConnection("user id=scott; password=tiger; data source=oracle");

        orclCon.Open();
        orclCon.Close();
      }
      catch (OracleException ex)
      {
        Console.WriteLine(ex);
      }
      finally
      {
        // Close the connection
        if (null != orclCon)
          orclCon.Close();
      }
    }
  }
}