Loosing Database Connection When Device Power-off (native Oledb Code)

Jul 12, 2006


I experienced this problems on both Windows Mobile 2003 SE and Windows Mobile 5.0.

Its native development (c++, oledb, atl and mfc).

It's quite simple to reproduce...

1. open a database

2. open a rowset on table A (whatever, valid of course and with both IOpenRowset and ICommandText), read datas and close rowset

3. power off

4. power on

5. try step 2 with another table (failed on openrowset with error 0x80004005) or try table A (sometimes working because of cached memory, sometims failed on Read Datas).

6. being stuck ;-)

Our work-around was, in case we loose our connection (identified by error 0x80004005 on openrowset), we close it and re-open database... ugly for sure, but working.

What I'm looking now is to use some kind of "detection method" like what people in .Net develoment are using "if ConnectionState.Open <> ...) for reopening my database only on demand...

Thanks in advance for any hints,

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Visual Studio 2005 The Remote Connection To The Device Has Been Lost. Please Verify The Device Connection And Restart Debugging.

Jun 19, 2006

Basically I've been using Visual Studio 2005 for a few weeks now moving a Pocket PC project from 2003 to 2005. When I hit the Start Debugging Button every time until today the project would rebuild and deploy to my pocket PC allowing me to debug etc but now I get

The remote connection to the device has been lost.

Please verify the device conection and restart debugging.

I used to get this problem in VS2003 sometimes and just like the numerous posts on different sites that I've looked at the problem eventually goes away and I'm none the wiser. One guy said that he found that if he went to bed the problem was resolved when he came back!

My PDA running Windows 2003 2nd Edition is directly connected to my PC via a USB port. I've rebooted my PC and done a soft reset on the PDA but it didn't help. I'm using ActiveSync 4.1.

Does anyone know how to resolve this problem?

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Jan 25, 2007

i have a sqlserver2005 ssis package which connects to a mysql webserver to upload data. i am connecting via mysql oledb connection and am able to test connect ok through the oledb connection manager. However in my ole db destination editor i get an 0x80040E21 error when trying to preview a table . The full error is :

Error at Data Flow Task [Destination - Query [70]]: An OLE DB error has occurred. Error code: 0x80040E21.

Error at Data Flow Task [Destination - Query [70]]: Opening a rowset for "INFORMATION_SCHEMA.address_book" failed. Check that the object exists in the database.

Exception from HRESULT: 0xC02020E8 (Microsoft.SqlServer.DTSPipelineWrap)

I can see all the tables in the drop down box in connection manager. This has been driving me nuts for the last 3 days! I have tried changing some of the security connection settings to no avail, (although i am not sure on what these do).I have also tried setting up as an odbc connection using script components but had memory errors after copying several hundred records and the package just hangs. I can go into this in more detail however i dont think they are related issues and i would prefer oledb as i dont have to script my data transfer.

any help much much appreciated.


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(Project Real Implementation) Error Code: 0x80004005 OLEDB Connection To SQL Server

Mar 25, 2008

Hi List
Im trying to set up an implementation of Project Real --it works like this-
Create two system environment variables called REAL_Root_Dir and
REAL_Configuration with the values given below. Click on
Start -> Control Panel -> System. Go to the Advanced Panel, click Environment Variables button, then New in the System variables box.

If the Project REAL files were installed at C:Microsoft Project REAL, then the variable values will be:

Variable Name: REAL_Root_Dir
Variable Value: C:Microsoft Project REALETL

Variable Name: REAL_Configuration
Variable Value: %REAL_Root_Dir%REAL_Config.dtsconfig

The package OLEDB connections work like this
First read enviroment variable to get location of config file
Next read Config File to get connection string for Config Database
<?xml version="1.0"?>
<Configuration ConfiguredType="Property" Path="Package.Connections[SQL - Configuration].Properties[ConnectionString]" ValueType="String">
<ConfiguredValue>Data Source=(local);Initial Catalog=DataWarehouseABC;Provider=SQLNCLI.1;Integrated Security=SSPI;</ConfiguredValue>
Next read Config database to get connection strings for Source and Destination databases

Destination database is called "DataWarehouseABC"
Source database is called "SnapshotABC"

the Source database OLEDB connection works 100%
however the destination OLDB connection we get this error below
PS--Both source and destination databases are on the same development machine , however both databases are restored bak files from another production machine

Error 1 Error loading LoadGroup_Daily.dtsx: SSIS Error Code DTS_E_OLEDBERROR. An OLE DB error has occurred. Error code: 0x80004005. An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "Login failed for user 'xxxxxx'.". An OLE DB record is available. Source: "Microsoft SQL Native Client" Hresult: 0x80004005 Description: "Cannot open database "DataWarehouseABC" requested by the login. The login failed.".

Any ideas on how one OLEDB Connection in this package can get this corruption

thanks in advance

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Loosing ODBC Connection

Apr 26, 2006

Hi all,

We recently converted an application from accecc97 to access2003.
We used to have 2 databases : 1 with all and only the data (axelD.mbd), 1 with all the forms, query's, ... (axelP.mdb)

We replaced the data (axelD.mdb) with an MSDE database, through UPSIZE and so on. That all worked fine.
This database is placed on the dataserver (DATA1), the converted programm is on the FRONT2 server (FRONT1 stil usess access97 until conversion is totally ready).

We are able to connect to the MSDE by using ADODB recordsets.
We are also perfect able to link the MSDEtables in our axelP.mbd database

We started to test some heavier parts of our application and started to get the following error:

"ERROR 3151"
"ODBC--connection to 'JOROSOFT' failed"

Nothing more.

This happened in a quite complex routine, whitch updates a lot of records, several times and so on.
We could reproduce the same error when executing the following code:

Public Function TestBestellingen()
Dim sql As String
Dim intervalset As DAO.Recordset
Dim planset As DAO.Recordset
Dim tellerke

x = Opendatabases()
tellerke = 0
sql = "Select bestelnummer from vkpbestellijn where bestelnummer > 100000"
Set planset = Db_AxelP.OpenRecordset(sql, dbOpenDynaset)
Do While Not planset.EOF
tellerke = tellerke + 1
Debug.Print tellerke & " - " & planset!Bestelnummer & " --> " & IsKlantStof(planset!Bestelnummer)
End Function

Function IsKlantStof(p_bestelnummer)
Dim sql As String, rst As DAO.Recordset
Dim hulp_klantstof As Boolean

hulp_klantstof = False
x = Opendatabases()
sql = "select klantstof from vkpbestellijn where bestelnummer = " & p_bestelnummer
Set rst = Db_AxelP.OpenRecordset(sql, dbOpenSnapshot)

With rst
Do While Not .EOF
If !KlantStof = True Then
hulp_klantstof = True
End If
End With
Set rst = Nothing
IsKlantStof = hulp_klantstof
End Function

Function Opendatabases()
If Db_AxelP Is Nothing Then
Set Db_AxelP = DBEngine(0)(0)
End If
End Function
I know this code makes no sence in a real-time environment, but it was to reproduce the error.
This code basically runs trough a 30.000 records and does a little check for certain fields
After 1981 records we get the above error.
(sometimes after 1979 or 1980 or 1982 records)

1977 - 100859 --> True
1978 - 100860 --> True
1979 - 100860 --> False
1980 - 100861 --> True
1981 - 100861 --> True

"vkpbestellijn" is a table that is linked in the AxelP.mdb trough an ODBC connection.
We get the same error (and after 1981 times) if I change the where to a totally other range of "bestelnummer"

I have installed the latest patches of Jet 4.0, MSDE-server, ...

I've been searching the internet for abour 3 days now, and just cant even find the smallest clue what could make this happen.

I hope someone here has an idea.
If you need more details, just ask.


P.S. I'm from Belgium, so my english aint "correct to the point".

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Jul 20, 2005

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Jan 5, 2008

I have tried to connect ce database by using c++ and oledb, and failed in every turn, i dont know what i did wrong...

I created a new database by using create a new database sample in ssce bol, but i couldnt connect that database, it says invalid class string or authentication failed...

here is a simple example...

CDataSource db;
hr = db.Open( "Provider=Microsoft.SQLSERVER.CE.OLEDB.3.5;Data Source=Newdatabase.sdf;Password='db_pwd'" );
if (FAILED(hr))

and also, afx oledb headers causing lots of redefinition warnings, if i include both ssce headers and afxole headers...

and also oledb example in ssce bol download is missing, there is no such like example...

can you provide me simple example to connect any ce database?

Installed programs
visual c++ 9.0
sql server ce books online
sql server ce 3.5 runtime
sql server ce 3.5 server tools
windows xp sp2

thanks in advance

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May 31, 2005


I'm getting a connection and then loosing my connection upon refreshing the browser with this script connecting to MSSQL using php, when trying the following:

PHP Code:

 $connection = mssql_connect("","test","") or 
die("Could not connect mssql db on " .$config['dbhost']);
mssql_select_db("dbName") or
die("Could not select database " ."dbName"); 

Are their other ways to see more error handling in connecting to MSSQL

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Jun 22, 2007

Where can I find Northwind OleDb Native Sample Application?

KB 909751 states to install VS 2005 with: "Smart Device Programmability install option"

When installing VS 2005 I do not get the opportunity to specify this option..

What am I missing?

Thanks in Advance..


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Nov 2, 2007

I have a script and on one of the tables I keep loosing the mapping of the last 4 fields. If I go into the task it will ask me if I want it to automatically fix it and I say yes and remap fields but when I run it it bombs and comes back and when I go back into it it tells me there is a problem with same fields. It also rearanges the order and puts these fields last.

I have tried deleting and redoing the transformation only to have the same thing happen. Almost seems like a bug in software. I have seen this before but usually when I fix it it does not return.

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Jul 15, 2006

For both OLEDB destiantions (and hopefully for the forthcoming ADO.NET destination adapter) it would be useful to have the following two output columns: NativeErrorCode and NativeErrorMessage.

For SQL Server, this would allow you distiguish between multiple errors which all roll up to the SSIS error "the value violated the integrity constraints of the column", which is way too generic for proper decision making (via conditional split).

For example, like SQL Server replication, you should be able to ignore duplicate key errors (error number 2627) indicating the record existed, but error out on nullability constraint errors (number 515) in which the record could not be inserted. If you had a native error code, you could make this decision, while the SSIS error for two different native errors is precisely the same.

There is a known and accepted race condition between a lookup transform and subsequent OLEDB dest insert attempt (assuming a non-transacted container and a common component target table), which is why the 2627 can be safely ignored in certain instances, while a 515 should not be.

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Nov 10, 2015

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Jul 16, 2007


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Feb 13, 2007

I apologize if this is not the correct forum for this posting. Looking at the descriptions, it appeared to be the best choice.

I am running Windows XP Pro SP2. I have installed the SQL Native Client for
XP. However, when I try to add a new data source through ODBC Connection
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Jun 26, 2007

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Can an SQL Server trigger call native C/C++ functions? If so, what is the mechanism?

Thanks in advance.

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Feb 26, 2007

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Massage: Unspecified error
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Source: SQL Server 2005
Mobile Edition ADO.NET
Data Provider

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Except for this case the application works fine.



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Sep 27, 2006

Hello, everyone.

I have to make a gateway to access third-party closed-source native-code COM objects. As an interface, SQL Server stored procedures are absolutely perfect for my needs. I decided to use SQL Server 2005 CLR rather than using deprecated extended stored procedures or accessing COM objects directly through SQL Server. (This decision is aided by the fact that the third party has plans to make a .NET version of their COM objects "really soon now" (i.e.: not soon enough). Backporting their new interface to my abstraction layer will be very simple.)

I'm having problems using these COM objects from my SQL Server 2005 CLR stored procedure. When I try to run my stored procedure, I get the error below. It appears that SQL Server/CLR refuses to perform the disk access necessary to load the COM object from disk so that it can instantiate it. (My message continues after the error.)

Msg 6522, Level 16, State 1, Procedure MyStoredProcedure, Line 0
A .NET Framework error occurred during execution of user defined routine or aggregate 'MyStoredProcedure':
System.IO.FileLoadException: LoadFrom(), LoadFile(), Load(byte[]) and LoadModule() have been disabled by the host.
at System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Evidence assemblySecurity, Assembly locationHint, StackCrawlMark& stackMark, Boolean throwOnFileNotFound, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Evidence assemblySecurity, StackCrawlMark& stackMark, Boolean forIntrospection)
at System.Reflection.Assembly.InternalLoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm, Boolean forIntrospection, StackCrawlMark& stackMark)
at System.Reflection.Assembly.LoadFrom(String assemblyFile, Evidence securityEvidence, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm)
at System.Activator.CreateComInstanceFrom(String assemblyName, String typeName, Byte[] hashValue, AssemblyHashAlgorithm hashAlgorithm)
at System.Activator.CreateComInstanceFrom(String assemblyName, String typeName)
at UserDefinedFunctions.MyStoredProcedure()

I'll outline the steps I performed so far to get the assembly working:
Ensured I was running at SQL Server 2005 compatibility level. (90)
- Installed and configured the third-party COM objects on my devel box and my DB box. They registered themselves properly.
- Enabled CLR in the DB.
- Made sure the DB owner has UNSAFE ASSEMBLY permission.
- Added the TRUSTWORTHY property to the DB. (Yes, this isn't the "correct" way to do it, but I didn't want to deal with code-signing voodoo. Apologies to actual believers in voodoo.)
- Created an Unsafe assembly "MyAssembly" in SQL Server 2005 and Visual Studio 2005.
- Created all the necessary Interop assemblies (by creating a normal (non-SQL) C# project and building my code, and raiding the bin directory).
- Added these Interop assemblies to SQL Server 2005 as Unsafe assemblies.
- In VS2005, built my SQL Project code and deployed successfully.
- Tried running my stored procedure through a Query window, and I got the error above.

I've done many searches. All of the results I've found concern themselves with Web Services and XML serialization, and suggest using sgen.exe. I don't think they're relevant to my problem. A few said I should add my COM DLLs as assemblies to SQL Server, but that is impossible for native code DLLs. I found something that hinted at tblexp.exe, but I didn't understand how that could help me. I already figured out a way to get me the Interop libs.

Efforts at solving:
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- I tried using sgen.exe to create the XML serialization assembly, but it didn't help.
- I tried adding various native-code DLLs directly as SQL Server assemblies, but you can bet it didn't like that.
- A few other pitiful attempts not worth mentioning.
- Reading this forum. I didn't see anything that applied.
- Posting here.

I really wish Microsoft had meant what they said when they stated that "Unsafe" assemblies can access anything, instead of trying to protect developers from their folly.

Any insights on getting those COM objects to work in my CLR stored procedure? Thank you.

-Tony Flay

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Feb 6, 2008

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Aug 3, 2007

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May 4, 2007


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Feb 14, 2006


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Sep 28, 2007

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TITLE: Microsoft Visual Studio
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// Create the connection fConnection = new SqlCeConnection("Data Source ="" + Path + "\TreeNotes.sdf" ;Password ="abcd1234";");

...works on my device, but on my computer it gives SqlCeException with message:
The database file cannot be found. Check the path to the database. [ File name = Program FilesTreeNotesTreeNotes.sdf ]

I've tried all sorts of things, but the computer just can't find the database. I've even tried putting a copy of the database into...
C:Program FilesTreeNotesTreeNotes.sdf...hoping that the computer will find it there.

What am I missing?

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