SqlDependancy OnChange Event Triggers Over And Over Again

Mar 29, 2007

I have an sql dependancy setup on a particular table that is not updated all that often. When I load my application that has the dependancy code in it, the onChange event of the SqlDependancy fires over and over again non stop. I am positive I am not updating the information in the table I am querying so I can not figure out why it would do that. But I bet one of you knows! If you need code I can supply it and if you need anything else let me know. Thanks in advance.

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SqlDependancy OnChange Event Problem

Feb 7, 2007

I've wrote a component that take advantage of the query notification macjanizm, i use this component in a web service , and its working great, with a little problem , i have imporsonation enabled in my web service and a user and password is set in the identity node in web.config , the impersonation is working great and the web service is running under the user name i've set in the web.config , but, when i change a table in the database and the change event is raised in my application the user name is no more the user in the web.config...The user is now ASPNET ....



How can i solve this problem of user name change?





Thanks in advance ,

Eden

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SqlDependency OnChange Event Fires Repeatedly

Mar 27, 2008

I am using the SqlDependency to notify me of data changes in a table. However, as soon as I start it, the OnChange event fires over and over even though no data has changed.

Essentially All I want to do is be notified when records are inserted into a table. I am able to get another example to work using a Service Broker Queue and a sql query of WAITFOR ( RECEIVE CONVERT(int, message_body) AS msg FROM QueueMailReceiveQueue ) However I would prefer not to use a queue for once my messages have been read they are taken off the queue and I would rather control that manually.

Any help with getting SqlDependency to notify my app when records are added and not over and over when the data has changed would be great.

Here is my code:




Code Snippet
public partial class Form1 : Form {


public static event OnChangeEventHandler OnChange;
string _strConnString = "Data Source=localhost;Integrated Security=SSPI;Initial Catalog=email_queue;Pooling=False;";
string _strSql = "SELECT email_id from email where isprocessed = 0";
private DataSet dataToWatch = null;
private SqlConnection connection = null;
private SqlCommand command = null;
SqlDependency dependency = null;
SqlDataReader sdr = null;


public Form1() {


InitializeComponent();
}

private void button1_Click(object sender, EventArgs e) {

SqlDependency.Stop(_strConnString);
SqlDependency.Start(_strConnString);
if (connection == null) {

connection = new SqlConnection(_strConnString);
connection.Open();
}
if (command == null) {

command = new SqlCommand(_strSql, connection);
}
if (dataToWatch == null) {

dataToWatch = new DataSet();
}
GetData();
}

private void GetData() {

dataToWatch.Clear();
command.Notification = null;
dependency = new SqlDependency(command);
dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);
command.CommandTimeout = 400;
using (SqlDataAdapter adapter = new SqlDataAdapter(command)) {

adapter.Fill(dataToWatch, "email");
}
}

private void dependency_OnChange(object sender, SqlNotificationEventArgs e) {

ISynchronizeInvoke i = (ISynchronizeInvoke)this;
if (i.InvokeRequired) {

OnChangeEventHandler tempDelegate = new OnChangeEventHandler(dependency_OnChange);
object[] args = { sender, e };
i.BeginInvoke(tempDelegate, args);
return;
}
dependency = (SqlDependency)sender;
dependency.OnChange -= dependency_OnChange;
this.Text = DateTime.Now.ToString();
GetData();
}

private void Form1_FormClosed(object sender, FormClosedEventArgs e) {

SqlDependency.Stop(_strConnString);
if (connection != null) {

connection.Close();
}
}
}

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Hi, I have several independent, system components that write auditevents to a database locally via ODBC and remotely via TCP, and I havea requirement to audit when the database is available for modification.First, does SQL Server have a concept of starting/stopping specificdatabase instances? Or does my database instance "stop" only when theNT service MSSQLSERVER stops?Second, Oracle has system event triggers, e.g. AFTER STARTUP, but Ican't find an equivalent in SQL Server 2000. What alternatives arethere?Note that I can't rely on the MSSQLSERVER start/stop events in the NTApplication Event log, as the events need to be inserted "in-band" intomy database's event table.TIA,Josh

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Thanks Jon

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SqlDependency OnChange Problem

Jan 4, 2008

Hi,

I have a windows application in C# that pretty much is a copy of the example found in http://msdn2.microsoft.com/en-us/library/a52dhwx7.aspx although I am using a different database.

My problem is that the SqlDependency event OnChange is firing all the time although on insert, update or delete is performed in the database. The event fires approximately 1000times in one minute!

Does anyone have a solution to this problem?

Thanks
/Jonas Djurback

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Getting SQLDependency To Fire The OnChange

Oct 20, 2006

After many problems with permissions I have got got SQL to accept a notification request but the public static void OnChange(object sender, SqlNotificationEventArgs e) is never triggered. The notification registers and de-registers ok. The same connect string successfuly connects to the same database to process queries.

I can see the GUID suffixed stored procedure, queue and service being created. Where does SQL2005 store the address/name of the routine it is to trigger? (When the notification is cancelled, the guid-siffixed items disappear) I have looked at the generated stored procedure, queue and service, but there is no indication of what is to be called back.

I have followed the instructions at http://msdn2.microsoft.com/en-us/library/ms181122.aspx, but so far without avail. I have checked the Application and system event logs, but there is indication therein. Also the SQL log.

So my questions are:

1) Where is the callback stored (is it a pointer or an actual name) ?

2) What steps should I take to resolve this?

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SqlDependency.OnChange() Not Firing

Aug 2, 2006

I am running

ALTER DATABASE dbname SET ENABLE_BROKER

on my app startup and then SqlDependency.Start(), and then the following code

SqlCommand cmd = con.CreateCommand();

cmd.CommandText = "SELECT request_queue.track_id, track.file_name, track.track_number, track.track_name, " +

"artist.artist_id, album.album_id, artist.artist_name, album.album_name " +

"FROM dbo.request_queue INNER JOIN track on request_queue.track_id=track.track_id " +

"inner join artist on track.artist_id=artist.artist_id " +

"inner join album on track.album_id=album.album_id";

cmd.CommandType = CommandType.Text;

if (con.State != ConnectionState.Open)

con.Open();

dep = new SqlDependency(cmd);

dep.OnChange += new OnChangeEventHandler(dep_OnChange);

SqlDataReader rdr = cmd.ExecuteReader();

List<Track> l = new List<Track>();

while (rdr.Read())

{

Track t = new Track();

t.TrackID = (int)rdr["track_id"];

t.Filename = (string)rdr["file_name"];

if (rdr["track_name"] != DBNull.Value)

t.TrackName = (string)rdr["track_name"];

t.TrackNumber = (int)rdr["track_number"];

l.Add(t);

}

rdr.Close();





and for some reason, after i do multiple changes to the request_queue table, (adding rows), the dep_on_change never fires, and if i check dep.HasChanges it is always false.

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Jul 17, 2007

Hi all,



I am investigating using Query Notifications - a great addition BTW. I have built a test app - loosely based on MSDN example - and am running against a SQL Express 2005 server. I have the following problem:



I have start/stop buttons to enable change checking, and a hardcode query that I am using for testing. If I stop and restart I now recieve duplicate notifcations, a single change causing the OnChange event to fires twice with two different ids Repeat this and the event will fires 3 times for each change and so on.

This only happens with a running app, if I restart the app I only get a single notification so I assume I have missed a step in stopping query notifcations or reinitialisation. I have include code below:



private bool Start()

{

try

{

// Remove any existing dependency connection, then create a new one.

SqlDependency.Stop(_currentConnectionString);

if (SqlDependency.Start(_currentConnectionString))

{

if (connection == null)

{

connection = new SqlConnection(_currentConnectionString);

}

if (command == null)

{

command = new SqlCommand(_sqlQueryString, connection);

}

return (true);

}

}

catch (Exception e)

{

MessageBox.Show(e.Message);

}

return false;

}

private void Stop()

{

SqlDependency.Stop(_currentConnectionString);

if (command != null)

{

command.Notification = null;

command = null;

}

if (connection != null)

{

connection.Close();

connection = null;

}

}

private void GetDataSnapshot()

{

// Empty the dataset so that there is only

// one batch of data displayed.

dataToWatch.Clear();

// Make sure the command object does not already have

// a notification object associated with it.

command.Notification = null;

// Create and bind the SqlDependency object

// to the command object.

SqlDependency dependency = new SqlDependency(command);

dependency.OnChange += new OnChangeEventHandler(dependency_OnChange);

using (SqlDataAdapter adapter = new SqlDataAdapter(command))

{

adapter.Fill(dataToWatch, tableName);

}

}

private void dependency_OnChange(object sender, SqlNotificationEventArgs e)

{

// This event will occur on a thread pool thread.

// Updating the UI from a worker thread is not permitted.

// The following code checks to see if it is safe to

// update the UI.

ISynchronizeInvoke i = (ISynchronizeInvoke)this;

// If InvokeRequired returns True, the code

// is executing on a worker thread.

if (i.InvokeRequired)

{

// Create a delegate to perform the thread switch.

OnChangeEventHandler tempDelegate = new OnChangeEventHandler(dependency_OnChange);

object[] args = { sender, e };

// Marshal the data from the worker thread

// to the UI thread.

i.BeginInvoke(tempDelegate, args);

return;

}

// Remove the handler, since it is only good

// for a single notification.

SqlDependency dependency = (SqlDependency)sender;

dependency.OnChange -= dependency_OnChange;

// At this point, the code is executing on the

// UI thread, so it is safe to update the UI.

++changeCount;

lblStatus.Text = String.Format(statusMessage, changeCount);

// Add information from the event arguments to the list box

// for debugging purposes only.

//lbChanges.Items.Clear();

lbChanges.Items.Add("+++++++++++++++++");

lbChanges.Items.Add("Id: " + dependency.Id);

lbChanges.Items.Add("Info: " + e.Info.ToString());

lbChanges.Items.Add("Source: " + e.Source.ToString());

lbChanges.Items.Add("Type: " + e.Type.ToString());

// Reload the dataset that is bound to the grid.

if (e.Info != SqlNotificationInfo.Error)

this.GetDataSnapshot();

}



Thanks, Nick



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Message
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We fixed one issue, but it brought up another. the fix we applied stopped the ServicesActive access failure, but now we have a failure on MSSEARCH. The users this is affecting do NOT have admin rights on the machine, they are SQL developers.
We were having

Event Type: Failure Audit
Event Source: Security
Event Category: Object AccessEvent ID: 560
Date: 5/23/2007
Time: 6:27:15 AM
User: domainuser
Computer: MACHINENAME
Description:
Object Open:
Object Server: SC Manager
Object Type: SC_MANAGER OBJECT
Object Name: ServicesActive
Handle ID: -
Operation ID: {0,1623975729}
Process ID: 840
Image File Name: C:WINDOWSsystem32services.exe
Primary User Name: MACHINE$
Primary Domain: Domain
Primary Logon ID: (0x0,0x3E7)
Client User Name: User
Client Domain: Domain
Client Logon ID: (0x0,0x6097C608)
Accesses: READ_CONTROL
Connect to service controller
Enumerate services
Query service database lock state

Privileges: -
Restricted Sid Count: 0
Access Mask: 0x20015



Applied the following fix

http://support.microsoft.com/kb/907460/


Now we are getting



Event Type: Failure Audit
Event Source: Security
Event Category: Object Access
Event ID: 560
Date: 5/23/2007
Time: 10:51:23 AM
User: domainuser
Computer: MACHINE
Description:
Object Open:
Object Server: SC Manager
Object Type: SERVICE OBJECT
Object Name: MSSEARCH
Handle ID: -
Operation ID: {0,1627659603}
Process ID: 840
Image File Name: C:WINDOWSsystem32services.exe
Primary User Name: MACHINE$
Primary Domain: domain
Primary Logon ID: (0x0,0x3E7)
Client User Name: user
Client Domain: domain
Client Logon ID: (0x0,0x60D37C1A)
Accesses: READ_CONTROL
Query service configuration information
Query status of service
Enumerate dependencies of service
Query information from service
Privileges: - Restricted Sid Count: 0 Access Mask: 0x2008D

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