First of all, I am still very new to LocalDB and to ADO.NET as a whole, so if this is a stupid question (and it probably is, knowing me and new material), I apologize.
I am building a .NET 5 console application, and using ADO.NET to connect it to a LocalDB database. There have been a few snags, though. First of all, I have to double-click the database file in Visual Studio's Solution Explorer (I'm using Visual Studio 2022 Community Preview) in order for the app to be able to see the database. This was a mild annoyance when I was doing internal testing, but now that that's done, I can't expect all of my users to have Visual Studio.
Second, I currently have the database connection string as an absolute path:
static string connectionString = "Data Source=(LocalDB)\\MSSQLLocalDB;Initial Catalog=P:\\PROJECTS\\NACS-TRACKER\\DATABASE.MDF;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";
Obviously, this won't work any more now that I'm ready to have others test the app. Given that I'm new to this, I don't really know if relative paths would be appropriate here. If so, how would I go about doing it?
Finally, how would I make sure that the database file is included with the build? Thanks!
Related
This is my connection string on my Visual Studio, my database file name is IOOP_Database
Data Source=IDEA-PC\SQLEXPRESS;Initial Catalog=IOOP_Database;Integrated Security=True
The problem is when I run this system on another laptop, there will be a error because of the connection string. Is there any way I can state my connection string as Date Source=IOOP_Database.mdf? I've also moved my mdf file to my Visual Studio project's debug folder, so the project file and the sql database file are actually together.
You can use AttachDbFilename property in connction strings. It has some limitations and has been advised to use that only in development environment not production.
AttachDBFilename is unique to SQL Express, it spins up a user instance of SQL Express attached to a specific DB Filename for single user mode. Database is simply the name of the database to use, it has no additional connotation. For any production server, you would most likely not be using AttachDBFilename. It is strictly useful for development and experimentation in single-user mode.
from MSDN forum
Also you might find these helpful:
similar question on stackoverflow
usage example
I have a project all in local.
I connected the database with visual studio(SQL Server and Visual Studio 2013), I think I had all right, but I can't found the developer section in umbraco.
in web.config
< add name="umbracoDbDSN" connectionString="Data Source=(LocalDB)\v11.0;Database=hotel;AttachDbFilename=|DataDirectory|hotel.mdf;Integrated Security=True" providerName="System.Data.SqlClient"/>
In the section Users, I can't check developer because I can't see it.
I have no idea what I have to do, maybe is the db not connected?
the user is the same that I use in other project and always worked.
And doesn't work either if I had #developer in the link of umbraco
Some idea for show the developer section? I searched in google and in umbraco.our, but I didn't find the correct answere.
From what I understand, you have not completed the setup. Of if you have, the LocalDb is empty or corrupt. Try to follow the setup as described in the documentation.
The first user you have created is automatically administrator, and will be able to access the settings and developer section.
If you are able to connect to the database (e.g. from Visual Studio), verify that you have correct data in your umbracoUser2app table.
You are using the DataDirectory in your connectionstring, also check that your .mdf file is not overwritten when launching your website from visual studio.
I find it hard to understand how Entity Framework in Visual Studio is dealing with a LocalDB.
In my project root folder I have a .mdf database file, let's call it MyDatabase.mdf
I'm using the MVVM pattern in my WPF application, so in my Model folder, I added an ADO.NET Entity Data Model (code-first from database).
Now in the Server Explorer view I always add a Data Connection to this MyDatabase.mdf, from here I can at least have some control over the database (like perform an EmptyDatabase procedure or whatever).
Now the most single annoying thing is that whenever I run my project, somehow under the Debug folder a new MyDatabase.mdf is created which has NO data in it.
In app.config there is this tag:
<connectionStrings>
<add name="DysphagiaModel"
connectionString="data source=(LocalDB)\v11.0;attachdbfilename=|DataDirectory|\DysphagiaDB.mdf;integrated security=True;connect timeout=30;MultipleActiveResultSets=True;App=EntityFramework"
providerName="System.Data.SqlClient" />
</connectionStrings>
I just can't figure out why Entity Framework works this way, and I find it hard to find any good documentation for developers that are new to this. I'm used to working with PHP and MySQL, which really is a hell lot simpler than this. So this is really extremely frustrating, and I can't imagine I'm the only one having these issues with understanding how Visual Studio (and EF) works and how the underlying mechanics work.
Most articles and documentation out there already assume you know some mechanics, and they won't help you with referencing to what you need to know.
Anyway for this specific issue, how can I have my project use the database I have in my project's root folder?
During development Visual Studio creates a copy of the database (and other files) each time it rebuilds your app for debug / release mode. As Adriano posted this will create a new mdf file each time you run a fresh application (It rebuilds your app).
If you wish this not to happen every time, you can change the "Copy to Output" property and choose to ("Do Not Copy" or "Copy if Newer"). To do this you need to open the Solution Explorer, right click on your mdf file, goto properties and change the "Copy to Output Directory".
If you wish to access your data "inserted" on debug mode then you can reference your localdb copy on you bin/debug/[yourdb].mdf on your SQL Server Object Explorer, or create a new data conection (the last one not recommended). But remeber that every time you restart your debug this will start over unless you change your propierties.
I have defined connection string in my app.config
<connectionStrings>
<add name="StoreConnectionString"
connectionString="Data Source=(local);MultipleActiveResultSets=True;AttachDBFileName=C:\Users\Firdavs\Desktop\Data\StoreServer.mdf;Integrated Security=True;User Instance=True;"
providerName="System.Data.SqlClient" />
</connectionStrings>
I am using c# and sql express in my application. When I am running in Visual Studio in my machine it works fine. But after creating setup and deploying into other machine. I am editing .exe.config file showing AttachDBFileName=Path. Application is giving me error. Sql Express is installed in that machine. I guess attaching is not working. What do you advice?
Please show me direction!
the problem is here : "AttachDBFileName=C:\Users\Firdavs\Desktop\Data\StoreServer.mdf;"
when you deploy it to another machine, that absolute path has low changes to be the same...you need to give a virtual path...
you need to copy the mdf in the same directory. Then in visual studio make sure that when you select the mdf file , you change the property of "Copy to Output Directory" to be "Copy if newer" (you change it by double-clicking on the "do not copy" text already listed there)
and then change AttachDbFilename to be ... AttachDbFilename=|DataDirectory|StoreServer.mdf;....
As I've said before on this site - the whole User Instance and AttachDbFileName= approach is flawed - at best! Visual Studio will be copying around the .mdf file and most likely, your INSERT works just fine - but you're just looking at the wrong .mdf file in the end!
If you want to stick with this approach, then try putting a breakpoint on the myConnection.Close() call - and then inspect the .mdf file with SQL Server Mgmt Studio Express - I'm almost certain your data is there.
The real solution in my opinion would be to
install SQL Server Express (and you've already done that anyway)
install SQL Server Management Studio Express
create your database in SSMS Express, give it a logical name (e.g. StoreServer)
connect to it using its logical database name (given when you create it on the server) - and don't mess around with physical database files and user instances. In that case, your connection string would be something like:
Data Source=(local);Database=StoreServer;Integrated Security=True
and everything else is exactly the same as before...
When you deploy to a customer's PC - go through the same steps: install SQL Server Express, create the database on the server, connect to it using the server=(local) (or the server=machinename approach) - and be done with it!
The Problem
If I have Visual Studio 2010, Service Pack 1 installed, and I go to Data, Add New Data Source and click Database, it brings up the standard Choose Your Data Connection wizard page.
On that page, if I have an existing connection configured, I can then select it, and add that data source to my project, no problems, no issues.
On the other hand, if I click New Connection... it just bombs out, wizard closes, as if I had done nothing. Now keep in mind, Visual Studio doesn't close, and there are no exceptions, errors, or warnings, the dialog window just disappears.
Unsuccessful Attempts to Resolve Issue
I've checked the simple things, using a debugger, and a valid machine config file, not sure what else I might be missing.
Using a Debugger
I tried starting a 2nd copy of Visual Studio as I did this, and
attaching a debugger to the process, with all exceptions checked in
my debug menu, and still nothing.
Validating machine.config file is valid
I backed up my machine.config file, and used another person's working machine's machine.config file, and I'm still having issues.
I have since reverted back to my own machine.config file.
I suspect the machine.config might be the issue, but I thought
taking a working one should work, unless I'm missing one of the
registered providers? I don't know enough about how this wizard
works behind the scenes though, or what sections/lines of the
machine.config file exactly drive the wizard.
Uninstalling all third-party database providers
I have recently tried uninstalling Oracle, SQLite, beta versions of SQL Server Compact Edition, and MySQL providers in hopes that one of them set a registry entry or configuration entry that was negatively impacting my ability to create new connections and the error still occurs.
Reinstalling Visual Studio
I reinstalled Visual Studio, complete uninstall, and reinstall, no extensions, or nothing, and the issue exists, definitely convinced its a configuration error at this point, I could use the expert opinion of someone who knows more about the configuration behind the scenes for this dialog though.
Any help in resolving the issue would be greatly appreciated.
Visual studio 2012 solution.
Close visual studio.
Open the event viewer, go to Application Log, and find Errors with source devenv.
Mine said
The following information was included with the event:
.NET Framework Data Provider for MySQL: An unexpected error occurred in the data provider.
Then i opened registry editor and went to:
HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\11.0_Config\DataProviders\
And deleted the key that reffered to the faulty data provider
{c6882346-e592-4da5-80ba-d2eadcda0359}
(default) = .NET Framework Data Provider for MySQL
I have the same issue. Delete all records in event viewwr and works.
Start -> run
Type "eventvwr"
Select application
Select "Action" > "Clear All Events" from menu
Save or not as you wish the events backup. Do the same with "System"
Try using Server Explorer window to add your Connection.
Try defining your Connection String from Settings.settings file
Try moving/deleting all the *.datasource files from the project/solution before adding the connection
Try creating a new, empty solution and see if the problem is solution-indepentent
Try finding out what registry keys and files Visual Studio uses when the issue occurs with Process Monitor from Sysinternals
I have had the same issue today.
Solved it by removing a tag in machine.config file:
**32-bit**
%windir%\Microsoft.NET\Framework\[version]\config\machine.config
**64-bit**
%windir%\Microsoft.NET\Framework64\[version]\config\machine.config
Tag to remove:
<DbProviderFactories/>
The problem is that when the dataset is modified, the dataset is linked to the bi object. I solved the problem like this: I made a change and registered the dataset and it came up an error. I then undo it with CTRL + Z, the error is resolved. Then I moved forward with CTRL + Y, and the error went away. Thanks to this solution, I added the query, added a new table.