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POChange Notification with Oracle Dependency in C#
 

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    <p>I'm trying to get oracle database change notification in c#. I found <a href="http://docs.oracle.com/cd/B19306_01/win.102/b14307/featChange.htm#BABDGFBH" rel="nofollow">this tutorial</a> about how to get these notifications. I've also created simple win form application for catching notifications</p> <pre><code>public partial class Form1 : Form { public Form1() { InitializeComponent(); SetUpNotification(); } private void SetUpNotification() { var login = "DATA SOURCE=XE;PERSIST SECURITY INFO=True;USER ID=USR;PASSWORD=PWD"; OracleConnection conn = null; OracleDependency dep = null; try { conn = new OracleConnection(login); var cmd = new OracleCommand("select * from customer_details", conn); conn.Open(); cmd.AddRowid = true; dep = new OracleDependency(cmd); cmd.Notification.IsNotifiedOnce = false; dep.OnChange += new OnChangeEventHandler(dep_OnChange); } catch(Exception e) { MessageBox.Show(e.Message, e.Source, MessageBoxButtons.OK, MessageBoxIcon.Error); } } void dep_OnChange(object sender, OracleNotificationEventArgs eventArgs) { MessageBox.Show(eventArgs.Details.ToString(), "Database changed"); } } </code></pre> <p>Login string and OracleCommand cmd are 100% fine. I tried also to change database programmatically, it changed data in database, but didn't fired OnChange event. </p> <p>I also granted notifications tu USR user</p> <pre><code>grant change notification to USR </code></pre> <p>and job_queue_processes are greater than zero.</p> <p>Can be a problem in a fact, that I am using <strong>Express edition</strong> of oracle database?</p>
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