I've made VB.NET application in VS2010 that uses a 2007 Access database, called MenuDB.mdb. During development, everything was fine.
Now that I'm publishing it, I'm getting weird errors because for some reason the app isn't connecting to the database.
I install the application and run it but as soon as it opens it gives this error:
System.Data.OleDb.OleDbException (0x80004005): Could not find file
'C:\Users\Administrator\AppData\Local\Apps\2.0\Data\OV86PXJA.K3R\8575R5AY.95Z\menu..tion_0d4fa454d69e8e6b_0001.0000_8340d263807cbb71\Data\MenuDB.accdb'.
I know the problem has to do with the way I'm relating the application to the database, but I don't know which way is right. In Solution Explorer I changed the Build Type of MenuDB.accdb to "Content" (earlier it was embedded resource". But it doesn't work either way. In my App.config I have the following connection string:
connectionString="Provider=Microsoft.ACE.OLEDB.12.0;Data Source=|DataDirectory|\MenuDB.accdb"
I want that when I deploy the application, the database should just sit in the application folder, wherever it gets installed. How can I do that?
Edit
I don't mind deploying it in such a way that I need to paste the database somewhere myself on the target machine - as long as it works.
If you have multiple users using the same or similar database, and dont have access to a SQL server (MySQL, MSSQL, or others), then co-locate the database at a central location (preferably network location) that all the users will have access to and change the connection string to accomidate the database location being on the network.
Just let it be known, Access can handle up to 10users when doing simple data retrieval/submission but if you ever have it open while others are accessing via data objects, then you may lock them out.
Related
I ran into deployment issues, so I created a test app to prove out the deployment process. I've kept everything as "out of the box" as possible:
I've created a simple (one table and one screen) VS2013 LightSwitch HTML client app, but the deployment fails, because it will not deploy the database schema.
I've created the Azure website and linked it to my Azure SQL Database, also the "Deploy database schema" checkbox is checked in the wizard.
It seems that my only option at the moment is to manually create the DB objects, which seems kind of absurd.
I have found a workaround to this issue.
It seems that the problem stems from not having the deployment credentials. What I have found is that if I attempt to deploy the server project there is a drop down list box that's supposed to be populated with available destinations. At the first attempt the list comes up blank but if I proceed to publish a message flashes up confirming a new set of credentials has been downloaded. After that I found I am able to publish the main project itself database objects as well.
In short; make sure you are properly logged in even if you have to log out and then in again, and also have deployment credentials up to date.
We have a WCF application on our web server. One of the service methods in this app creates an Excel XLS file with data and places the file in a directory so the user can down load the file later.
Our problem is that when this app attempts to create the Excel object, we get this error: Error in Create Excel Helper Workbook, and Application: Retrieving the COM class factory for component with CLSID {00024500-0000-0000-C000-000000000046}
failed due to the following error: 8000401a The server process could not be started because the configured identity is incorrect. Check the username and password.
This is the line that causes the error:
using EX = Microsoft.Office.Interop.Excel;
EX.Application Application = new EX.Application(); //causes error
I did some research and what I have tried is to go into DCOMCNFG - Computers - My Computer - DCOM Config and Right clicked "Microsoft Excel previewer" - properties - Security, then added several groups and users to have Local Launch, Local Activation, etc....
But this did not help. Some of the articles say to choose "Microsoft Excel Application". However, I only see "Microsoft Excel previewer" in my DCOM Config.
Excel is installed on this server but we still have the above problem.
One strange thing is that if I remote into the server, then have my client(browser) on my PC call the service method to create the XLS, this works without a problem.
What do I have to do to resolve this issue?
You can attempt to make this work by setting the IIS AppPool Identity to a user that has interactive logon rights. The interop assemblies actually work by launching an Excel instance on the server and then communicating with it to perform work.
That being said, having gone down this road before, it is a poor solution. The challenges you'll face are as follows:
Issues with DCOM permissions that are difficult to diagnose and resolve (you're running into this now)
Excel processes get spawned on the server and half the time do not close properly, so your application has to be smart enough to go around killing errant Excel processes, or living with the fact that your application is going to leak memory like crazy
It isn't supported or recommended by Microsoft
Office wasn't designed with server-side security considerations in mind
See the following for additional details:
https://support.microsoft.com/en-us/kb/257757
im working on a Window server 2008, in this server i developed a vb.net 2008 console application that open a excel 2003 file and use its contents to create a xml file, so i have two situations:
1. Differences in execution of the program: if i run the application from the Visual Studio or directly from the executable it open and process the excel without problems but if i configured a task on the windows task scheduler or in the adtempus that execute this program its failed and throws this exception:
Exception from HRESULT: 0x800A03EC- at Microsoft.Office.Interop.Excel.Workbooks.Open(String Filename, Object UpdateLinks, Object ReadOnly, Object Format, Object Password, Object WriteResPassword, Object IgnoreReadOnlyRecommended, Object Origin, Object Delimiter, Object Editable, Object Notify, Object Converter, Object AddToMru, Object Local, Object CorruptLoad)
at .Module1.convertExcelToXmlFile(String excelFile)
i have read alot about this exception, but at the moment im unable to resolved, so I want to know how this program can execute correctly from Visual Studio or directly from the execute but failed when its execute on a task if both situations are in the same server? is there a way to fix this behavior?
2. In the console application when i open the excel file with the open method, the file in excel appears for a few seconds then it closed, is there a way to access the excel file contents but that the file dont show in Ms Excel?
thanks.
You should not be using Office Interop in an unattended process.
Microsoft does not currently recommend, and does not support, Automation of Microsoft Office applications from any unattended, non-interactive client application or component (including ASP, ASP.NET, DCOM, and NT Services), because Office may exhibit unstable behavior and/or deadlock when Office is run in this environment.
If you are building a solution that runs in a server-side context, you should try to use components that have been made safe for unattended execution. Or, you should try to find alternatives that allow at least part of the code to run client-side. If you use an Office application from a server-side solution, the application will lack many of the necessary capabilities to run successfully. Additionally, you will be taking risks with the stability of your overall solution.
http://support.microsoft.com/?id=257757
There are a number of products that will manipulate Excel docs and run correctly unattended.
Is the Excel file you're trying to open on the network?
If so, the problem is most likely because your Task Scheduler service and any jobs it runs are (by default) running under the local SYSTEM account, which is prohibited from network access.
If you change the task to run under a different account (say, for example, a domain account that you have given privileges for the remote fileshare). (Note that this change may effect how other scheduled tasks run, so you'll want to be quite sure of the permissions needed.)
Just in case you have not figured it out yet, the most-likely resolution which worked for me can be found at this URL :
https://social.msdn.microsoft.com/Forums/en-US/b81a3c4e-62db-488b-af06-44421818ef91/excel-2007-automation-on-top-of-a-windows-server-2008-x64?forum=innovateonoffice
If your server is a 64-bit one, create a folder named 'Desktop' in the below mentioned path i.e. C:\Windows\SysWOW64\config\systemprofile\Desktop
If your server is a 32-bit one, please make this folder C:\Windows\System32\config\systemprofile\Desktop
My database file Whist.mdf was attached to a SQL Server Express through Management Studio, but it stopped working in that sense that NHibernate in my asp.net solution fired some connection exceptions. I just detached it from Management Studio because I couldn't open the database in there either.
But when I try to reattach it I get this error:
Attach database failed for Server 'MyPCName\SQLECPRESS'. (Microsoft.SqlServer.Smo) Unable to open the physical file "C:\Program
Files\Microsoft SQL Server\MSSQL10.SQLEXPRESS\MSSQL\DATA\Whist.mdf".
Operating system error 32: "32(process cannot access the file because
it is being used by another process)". (Microsoft SQL Server, Error:
5120)
I have googled it but can't find a solution that works for me. E.g.:
http://www.byteblocks.com/post/2010/01/06/Unable-to-open-the-physical-file-Microsoft-SQL-Server.aspx
"Cannot open user default database. Login failed." after installing SQL Server Management Studio Express
There is something about User Instance but I cant figure out if it have anything to do with that:
http://blogs.msdn.com/b/sqlexpress/archive/2006/11/22/connecting-to-sql-express-user-instances-in-management-studio.aspx
I have tried to delete the mdf file in windows but I can't do that either:
The action can't be completed because the file is open in system
I have tried stopping the SQL Server process, closing explore and delete from cmd and rebooting...
Hope someone can help - I guess it is just a simple thing..
I think you are on the right track. The error messages you are getting indicate that some SQL Server process is keeping the database file open. And SQL Server is designed to only allow the database file to be open by a single SQL Server process at a time.
You are also probably right to suspect User Instance of SQL Server Express to be the guilty process here. User Instance is a special SQL Server process that doesn't run as a service and instead is started and owned by the application that tries to connect to it. In your case there are two User Instances that can be the problem, one owned by the ASP.NET application you mentioned and one owned by you and started by Visual Studio. If you are using IIS Express or you configured the IIS App Pool for the ASP.NET application to run as your account then we only have one User Instance to worry about.
My recommendation is that you don't use User Instances and don't try to connect directly to the database file. Go over your connection strings and remove User Instance=true from all of them. You want to remove AttachDBFilename=... property as well.
If the database file is added to any of your Visual Studio solutions remove it (just be careful not to delete the file itself). The last step is to remove any connections to the database file from your Data Connections node in the Server Explorer.
Then restart the machine to make sure any User Instances that were running in the background were shutdown. After the machine starts again you should be able to attach the database file back to your main SQL Server Express using SQL Server Management studio. Let's name the database Whist
To connect to your database use the following connection string:
Data Source=.\SQLExpress;Integrated Security=true;Initial Catalog=Whist
When you connect from the ASP.NET application, make sure that you have created an account in your SQL Server Express for the application.
Turned out to be an issue with Daemon tools for me as well associating the .mdf file as an image.
If you want to copy your .mdf and .ldf file from your database, you can set your database file to 'offline' first . Please follow this steps:
Open your SQL Server 2008(suppose you are using SQL Server 2008 ).
Select your Database that you want to copy then left click.
Go to Tasks -> Take Offline.
Right click.
Then you can copy this database file to any folders.
As part of our product's installation process, a database is attached to the server.
We use EXEC sp_attach_db in order to attach it to MSSQL.
The problem occures when we try to attach it with "SQL Authentication" connection string - the database is attached to the server as read-only, thus preventing any write access from being performed
This is driving us nuts... it's working just fine with Windows Authentication, and the only difference is the connection string... I tried googling for it but no mention for such a scenario is found.
Any ideas anyone?
It's important to mention that the MDF/LDF physical files are not set with "ReadOnly" attribute, so this is not the problem.
I'm curious why you can't attach the database with write permissions and then just make the whole thing read only after the install?