Open SqlCeConnection From An ASP.NET Web Service?

Aug 9, 2006

Help!

I am trying to implement a web service that creates and populates a SQL Mobile database file, then returns the created database to a mobile device as a byte array. The database size could be in excess of 500,000 rows, which is why I want to do as much of this preprocessing on the server before it gets to the mobile device. I can't use replication since I have to do some shaping of the data before I can use it on the mobile device.

Unfortunately, the web service is throwing the following exception when I try to instantiate a SqlCeConnection object:

"System.NotSupportedException: SQL Server Everywhere Edition is not intended for ASP.NET development."

Are there any suggestions as to how I can get around this potential limitation? If I refactor out the code that actually performs the SqlCe operations to a separate assembly, but still call that assembly from within the ASP.NET process, will I get the same error?

I know that you can work with Sql Mobile databases from the deskop, and I suppose I could invoke a console application to create the database, but that seems like such a hack.

Thanks for any advice,

Matthew

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SqlCeConnection Guidelines - Keep It Open?

Feb 16, 2006

What is exactly the recommended way of using a SqlCeConnection object in your application?

In all the examples I see (IBuySpyDelivery for example) it opens the connection object in the constructor and leaves it open most of the time until the class gets disposed.

Is that the way to do it? Or should you open and close the connection for each database action (insert/select/delete) you're doing on the local SQL Mobile database?

I'm a bit confused, but maybe I'm messing up the way of working on remote database servers with how it should be done on a local SQL Mobile db.

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Dec 4, 2007

I'm having a problem where I am getting a "Permission denied" exception when I call Open on a SqlCeConnection object using SqlCE version 3.5. It does this when mode is set to Read Only in the connection string. Furthermore it does this on XP, but not Vista. Here is the connection string I'm building:

string connectionString = "Data Source='" + fileName + "';password=" + DBPassword + ";mode='Read Only';Temp File Directory='" + Path.GetTempPath() + "'";

A prompt response with a resolution to this would be greatly appreciated.

Ron

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I know that with traditional SQL systems, it is important to only open connections to a sql server when they are needed. However, since there is no "server" in mobile apps, is it bad practice to leave one open throughout the duration of an application?

The application is going to be constantly reading and writing to the data tables and it seems like it might be a good idea to leave it open.

Thanks!

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SqlCeConnection Failing To Open A Connection To The SQL Server 2005 Mobile Edition

Apr 15, 2008

Good day,

I am writing an application using VB.Net 2005 for the Windows CE 5.0 device and it is connecting to a SQL Server 2005 Mobile Edition Database.
The trouble I'm having is establishing a connection to a SQL Server Mobile database on the device.

Here is the code I am using:




Code Snippet
Public gConnectionString As String = "Data Source=Program FilesMobAppMobDB.sdf;Persist Security Info=False;"




Code Snippet

Imports System.Data.SqlServerCe

Public Class DBManager

Public Shared gSQLCEConnection As SqlCeConnection


Public Shared Function OpenDB() As Boolean

If gSQLCEConnection IsNot Nothing Then

Throw New InvalidOperationException("Connection already open.")
End If
gSQLCEConnection = New SqlCeConnection(gConnectionString)
Try

gSQLCEConnection.Open() 'Error occurs here
Return True
Catch ex As SqlCeException

MsgBox(ex.Message & vbCrLf & ex.HResult & vbCrLf & ex.NativeError & vbCrLf & ex.Source)
Return False
End Try
End Function


In the immediate window I recieve the following messages:


A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

A first chance exception of type 'System.IO.FileNotFoundException' occurred in mscorlib.dll

A first chance exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll

A first chance exception of type 'System.Data.SqlServerCe.SqlCeException' occurred in System.Data.SqlServerCe.dll


I believe that the first few lines are caused by the icons/pictures that I have included with my app, but the SqlCeException line occurs when the connection to the .SDF file is trying to be established.

Here is the exception output:

Message: "" (Blank)
HResult: -2147024882
NativeError: 0
Source: SQL Server 2005 Mobile Edition ADO.NET Data Provider

Programs under Remove Programs on the PDA are:
Microsoft .NET CF 2.0 ENU-String R...
Microsoft .NET Compact Framework...
Microsoft SQL Client
Microsoft SQL Mobile 2005
Microsoft SQL Mobile 2005 [EN]
Microsoft SQL Server 2005 Compact...
Microsoft SQL Server 2005 Compact...
Microsoft SQL Server 2005 Compact...
Microsoft SQLCE 2.0
Microsoft SQLCE 2.0 Dev

Any ideas on what could be stopping this connection from being established? It was working before but all of a sudden just stopped. I have warm booted, cold booted, and rebuilt with no luck and also checked that SQL Query Analyzer is not running on the PDA and that the connection string is valid.
The call to OpenDB occurs in the form_load of the startup object.

Thanks in advance,

Leon

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Hi,



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Parameter name: SelectedIndex "



I have tried re-installing the entire SQL server setup and this made no difference, I followed this by removing then reinstalling just the Report Service. Still nothing.



Any ideas as to what it is doing and how I should go about fixing it?



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Hi, there;
I have a couple of issue that really frustrates me. I asked a similar question before but I haven't resolved it yet.
My application was developed with VS2003, c#,CF1.0,Sp1.

I found that after my application runs for a couple of hours, my SqlCeDataAdapter.Fill() method throw exception "Error Code: 8007000E Message : Not enough storage is available to complete this operation.". I found a couple of threads on the website said that I have to dispose adapter object (including its command objects.) Yes, I did!!!. And I also dispose my SqlCeConnection before it is out of range and recreate it when I need it. See:http://www.tutorials-se.com/sqlserverce/Keeping-SqlCeConnection/

I also introduced hotfix from http://support.microsoft.com/Default.aspx?kbid=827837.
It looks like I tried everything, but I still has this exception.

At the same time, From thread "http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=426640&SiteID=1", Mr. Ilya said "native DLL (e.g. bar code scanner API) " could cause AV (access violation) issue. Yes, my application is running on Symbol 9062B device which use barcode scanner API, sometimes application will have "0xc0000005" exception when it exists (not when it is running)
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Hopefully I make myself clear.
So my question is:
1. Will Sp3 help this? (Of course I will do some test)
2. How can I know memory or stack are corrupted/How to trace.

Again, thanks Mr.Ilya, you do a great job here, you are really really helpful!

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I've got an application uses a WPF GUI, is built in VS2008 final, targets .Net Framework 3.5, and uses a Sql Ce 3.5 database for local storage. After a specific WPF window is rebound the application hangs. Hitting pause on the debugger reveals the offending method is a call to SqlCeConnection.Dispose(). Via Reflector I can see this method calls SqlCeConnection+ObjectLifeTimeTracker.Close() which in turn calls GC.WaitForPendingFinalizers(). Within WPF there are some objects (specifically TextBox) which need to have their resources freed on the main application thread. The finalizer thread is waiting on the main application thread, which is in turn waiting on the finalizer thread, resulting in a deadlock.

You can see some additional discussion of the topic including our temporary resolution in this thread.

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Jul 11, 2006

Hi,

I'm having the problem that my application hangs on SqlCeConnection.Dispose() when I'm closing the app.

public class DatabaseManager : IDisposable
{
private DbConnection connection = null;

// Singleton
private DatabaseManager()
{
this.CreateConnection();
}

~DatabaseManager()
{
this.Dispose();
}

public void Dispose()
{
if (this.connection != null)
{
this.connection.Dispose();
}
}
// ...
}

This only happens when I'm calling Application.Exit(); and Dispose is called through the destructor of the DatabaseManager class. When I'm disposing the connection during normal work the call works as intended. BTW I'm using SQL Server Mobile 3.0.5214.0 on a PPC 2003 AKU2 (Symbol PPT8846 industrial device).



Thanks for support,
Klaus

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Problem In Reading The Line Public Mycon As New Sqlceconnection

Feb 19, 2008



Hi Frndz

I am facing a problem with vb.net application which i created to connect with and sqlservermobile edition file (.sdf).
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i imported system.data.sqlceserver and added the references too.

but It is working in my one of the system. i tried the same in some other system,its not working. you frndz have any about this. I think the system is lacking some dll files. any body having an idea about this. pls help me out.

Nahas

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Nov 13, 2007



Hi

I am developing a program on Visual Basic 2005 to a pocket pc, I want to make the SQLceconnection but It says that the file doesnīt exists, I use this code:


Dim conn As New SqlCeConnection()

Dim Recordset As SqlCeDataAdapter

Dim SQL As String

Dim ds As New DataSet

conn.ConnectionString = _

"Data Source = '.BDDclimatologicos.sdf';"

conn.Open()

SQL = "select [Provincia] from ZonasClimaticas"

Recordset = New SqlCeDataAdapter(SQL, conn)

Recordset.Fill(ds, "ZonasClimaticas")

lstboxProvincias.DataSource = ds.Tables("ZonasClimaticas").DefaultView


I have Dcilmatologicos.sdf on a folder named BD next to the folder of the executable, I donīt know what happends.

My database has one table "ZonasClimaticas" and a column named "Provincia" on that, my other question is:

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Apr 4, 2007



Hi all,



I am trying to access my SQL Server database through SqlCeConnection:



cecon = new SqlCeConnection("Data Source=D:\D_Drive\csharppract\nddbpda\nddbpda\nddbpdadatabase.sdf");

cecon.Open();



I am getting the following error:



System.Data.SqlServerCe.SqlCeException was unhandled
Message="The path is not valid. Check the directory for the database. [ Path = D:\D_Drive\csharppract\nddbpda\nddbpda\nddbpdadatabase.sdf ]"
HResult=-2147467259
NativeError=25009
Source="SQL Server 2005 Mobile Edition ADO.NET Data Provider"
StackTrace:
at System.Data.SqlServerCe.SqlCeConnection.ProcessResults()
at System.Data.SqlServerCe.SqlCeConnection.Open()
at System.Data.SqlServerCe.SqlCeConnection.Open()
at nddbpda.frmCeMain.frmCeMain_Load()
at System.Windows.Forms.Form.OnLoad()
at System.Windows.Forms.Form._SetVisibleNotify()
at System.Windows.Forms.Control.set_Visible()
at System.Windows.Forms.Application.Run()
at nddbpda.Program.Main()





When I tried to get the path from which the database file is being accepted, I got a different path:



string path;

path = System.IO.Path.GetDirectoryName(

System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);

MessageBox.Show(path);



This code gives me this path:



Program Filesddbpda





Then I changed the path in my connection string to this:



cecon = new SqlCeConnection("Data Source=\Program Files\nddbpda\nddbpdadatabase.sdf");

cecon.Open();



When I ran my application it worked (virtually), but the database is not getting updated (for obvious reasons).





What should I do now to correct this?



Thanks in advance.

Saswata.



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HELP: SqlCeConnection Path Error In .NET Compact Framework (Pocket PC Emulator)

Apr 4, 2007



Hi all,



I am trying to access my SQL Server database through SqlCeConnection:



cecon = new SqlCeConnection("Data Source=D:\D_Drive\csharppract\nddbpda\nddbpda\nddbpdadatabase.sdf");
cecon.Open();




I am getting the following error:



System.Data.SqlServerCe.SqlCeException was unhandled
Message="The path is not valid. Check the directory for the database. [ Path = D:\D_Drive\csharppract\nddbpda\nddbpda\nddbpdadatabase.sdf ]"
HResult=-2147467259
NativeError=25009
Source="SQL Server 2005 Mobile Edition ADO.NET Data Provider"
StackTrace:
at System.Data.SqlServerCe.SqlCeConnection.ProcessResults()
at System.Data.SqlServerCe.SqlCeConnection.Open()
at System.Data.SqlServerCe.SqlCeConnection.Open()
at nddbpda.frmCeMain.frmCeMain_Load()
at System.Windows.Forms.Form.OnLoad()
at System.Windows.Forms.Form._SetVisibleNotify()
at System.Windows.Forms.Control.set_Visible()
at System.Windows.Forms.Application.Run()
at nddbpda.Program.Main()






When I tried to get the path from which the database file is being accepted, I got a different path:



string path;
path = System.IO.Path.GetDirectoryName(
System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
MessageBox.Show(path);






This code gives me this path:



Program Filesddbpda






Then I changed the path in my connection string to this:



cecon = new SqlCeConnection("Data Source=\Program Files\nddbpda\nddbpdadatabase.sdf");
cecon.Open();






When I ran my application it worked (virtually), but the database is not getting updated (for obvious reasons).





What should I do now to correct this?



Thanks in advance.



Saswata.

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Step Name MainStep
Duration 00:00:00
Sql Severity 16
Sql Message ID 6522
Operator Emailed
Operator Net sent
Operator Paged
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CREATE PROCEDURE [usp_ProcessMessage]

AS

BEGIN

SET NOCOUNT ON;

DECLARE @conversation_handle uniqueidentifier

DECLARE @message_body AS VARBINARY(MAX)

WHILE (1=1)

BEGIN

BEGIN TRANSACTION;

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SEND ON CONVERSATION @conversation_handle

MESSAGE TYPE [tcp://mydomain.com/TARGET/VisitMessage]

(@message_body);

END

COMMIT;

END

END

GO



My endpoints are created like so:



CREATE ENDPOINT MyEndpoint

STATE = STARTED

AS TCP

(

LISTENER_PORT = 4022

)

FOR SERVICE_BROKER (AUTHENTICATION = CERTIFICATE MasterCertificate)

GO



GRANT CONNECT TO CertOwner

GRANT CONNECT ON ENDPOINT::MyEndpoint TO CertOwner

GO



And my routes like so:



GRANT SEND ON SERVICE::[tcp://mydomain.com/INITIATE/MyService] TO CertOwner

GO

CREATE REMOTE SERVICE BINDING [MyCertificateBinding]

TO SERVICE '[tcp://mydomain.com/TARGET/MyService]'

WITH USER = CertOwner,

ANONYMOUS=OFF

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GO

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