I deployed C# application and created installer. Installer gets created successfully but when tried to launch the application it throws up following error:
An attempt to attach an auto-named database for file CampusPointe.mdf
failed. A database with the same name exists, or specified file cannot
be opened, or it is located on UNC share.
connection string in app.config is as follows:
<connectionStrings>
<add name="App_Key_Management.Properties.Settings.VendorKeyConnectionString1"
connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename="C:\Program Files\Vendor Key Management\VendorKey.mdf";Integrated Security=True;Connect Timeout=30;User Instance=True"
providerName="System.Data.SqlClient" />
</connectionStrings>
Any help would be appreciated.
Regards,
Sri
Sri,
First of all, you need to ensure a couple of things:
1. You have installed SQL Server
2. You need to deal with the creation or replacement of the file you created. I think this is your issue ... If the .mdf file exists then you need to either update the existing file or drop and replace it (USE [database] GO DROP TABLE... GO CRATE TABLE ... GO). You will also need to consider step 4 below.
3. If you are accessing a a file located in a database you need a fully formed name. You also need to add the database user to the connection string in ASP.NET Web.Config or App.config (depending on the app). I looks like you have started this ...
4. Make sure the user account that you are using in the connection string has the necessary privileges on the database side. If this is a full fledged database in SQL SERVER then the user account will need update, delete, create privileges. If you are replacing or creating databases on the fly then the user will need CREATE DATABASE or DROP / CREATE privileges.
I think to best answer your question we would need more information on the architecture of the application. My guess is that your code creates the database fine the first time and then when you try to run it the second time it fails because the database is already there. If this is the case you also need to address your code (with IF statements or SWITCH CASE ... your call) to handle situations where the table (1) does not exist and needs to be created; (2) exists and needs to be updated; and / or (3) exists and needs to be replaced. The correct answer again depends on your code and what you are trying to do.
Related
I have a simple data entry Windows Form with a datagridview display that links to a local database. When I run the program and try to add data on another computer, I get this message:
Unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.
An attempt to attach an auto-named database for file C:\Users\roberto.yepez\Documents\Visual Studio\2010\Projects\Financial Aid Calculator\Financial Aid Calculator\StudentInfo1.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share."
The file path is to the path on the computer where I coded the program.
Here is my code:
SqlConnection conn = new SqlConnection(#"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename='C:\Users\roberto.yepez\Documents\Visual Studio 2010\Projects\Financial Aid Calculator\Financial Aid Calculator\StudentInfo1.mdf';Integrated Security=True".ToString());
I am a self-taught coder, please help! :)
I believe you're running into a problem because your local sql server to which your code is trying to attach the StudentInfo1.mdf (whose path is in the connection string) already contains a database called StudentInfo1 - it decided to try and create a database of this name based on the name of the mdf file. I'm guessing that you can pick your own name by specifying Initial Catalog in your connection string but this would mean there are two databases with possibly the same set of tables and a potential for confusion
Per the comment I posted I would instead advocate that you use SQL Server Management Studio to permanently attach your db (you make have already done this) and then adjust your connection string so that it refers to the permanently attached db. This reduces the chances that your next question will be "my code says it's updating my db but I cannot see any changes!?"
Please move this connection string
"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename='C:\Users\roberto.yepez\Documents\Visual Studio 2010\Projects\Financial Aid Calculator\Financial Aid Calculator\StudentInfo1.mdf';Integrated Security=True"
to app.config file. When you deploy to production, change the paths in that app.config, according to the production machine settings.
You can even apply transformations on the app.config to deploy in various machines/scenarios.
I am trying to make a simple database application. It is just writing and reading from local database file using c# winform, but when i move the application folder to another pc, it comes with error. I thought it is just some dumb mistake with connstring or file accesses but when i click continue and the Application starts, there is even nothing loaded in combo boxes (which should be filled normally, without using any database stuff). Sorry for my English and thanks for response.
I cannot post image because i am new here but the exception says among other text this:
error 50 - local database runtime error occurred. The specified
LocalDB instance does not exist.
The solution really depends on what is your application's design.
Centralized Database:
If your application is supposed to use the centralized database - meaning multiple c# winform applications connect with same database.
Then you will have to make sure that the database server's IP address / machine name / Identifier is mentioned as "Data Source" in the connection string.
For ex. below connection string shows, how you will connect to database if windows authentication is to be used for connection. You will have to replace Data Source as your IP address and Initial Catalog with the database name
Data Source=your-server-address;Initial Catalog=your-database;Integrated Security=TRUE;
Local Database:
If your application is supposed to use local database i.e. for every c# winforms application user, there will be local database on his machine,
Then you will have to make sure that the required components (i.e. SQL Express, SQL or any other database server you want to use) are installed.
Hope this clarifies.
Check your LocalDB connection string and point it to the right file location as you can see below (taken from here). Its path is now different as you moved your application (AttachDBFilename attribute)
<connectionStrings>
<add name="DefaultConnection" connectionString="Data Source=
(LocalDb)\MSSQLLocalDB;Initial Catalog=aspnet-MvcMovie-fefdc1f0-bd81-4ce9-b712-
93a062e01031;Integrated Security=SSPI;AttachDBFilename=|DataDirectory|\aspnet-
MvcMovie-fefdc1f0-bd81-4ce9-b712-93a062e01031.mdf"
providerName="System.Data.SqlClient" />
</connectionStrings>
I've been given a site that was created by someone else and I'm now trying to test it. I can compile the system without any problems but when I try to log in to the website, I get the error:
"EntityException occured. A first chance exception of type 'System.Data.EntityException' occured in System.Data.Entity.dll. Additional info: The underlying provider failed on Open."
Furthermore, if I dig deeper, I see an InnerException of Cannot open database \"MyDB\" requested by the login. The login failed. Login failed for user 'name\\owner'.
I've read similar problems on the web and it seems like its a problem with database connections? I've tried multiple 'solutions' that include messing around with the connectionString but nothing works.
What I think the system wants to do is connect to a .mdf located in a separate project's App_Data. Anyway, here's the connectionString code that I received originally:
add name="NameServiceContext"
connectionString="Server=tcp:qiu5vg5yhv.database.windows.net,1433;Database=MyDB;User ID=MYID;Password=MYPASS;Trusted_Connection=False;Encrypt=True;Connection Timeout=30;"
providerName="System.Data.SqlClient"
Quick question, what is the tcp:...... stuff? I'm assuming it was generated somehow, but how?
I've tried 'fixing' the problem and ended up with something like this:
add name="NameServiceContext"
connectionString="data source=./SQLEXPRESS;AttachDbFilename=C:\Users\owner\Documents\MyERP\App_Data\MyDB.mdf;Integrated Security=True;Connect Timeout=30;"
providerName="System.Data.SqlClient"
Both methods give the same errors and I'm out of ideas. How would I go about fixing this?
Also, when I connect to a db via tools>connect to database > MS SQL db file, I get an option between 2 data sources, ./SQLEXPRESS and (LocalDB)\v11.0. Do I have to include both of them? If so, how?
The original connection string refers to a Microsoft Azure instance. A typical connection string to Azure looks like:
Server=tcp:[serverName].database.windows.net;Database=myDataBase;User ID=[LoginForDb]#[serverName];Password=myPassword;Trusted_Connection=False;Encrypt=True;
Your server name is qiu5vg5yhv.database.windows.net. Most likely your credentials are incorrect.
It is as Andrew said, you don't seem to have access to the actual database. Simply download either "SQL Server Management Studio" or "SQL Server Management Studio Express" (depend on which version of database you are using) and try to connect.
If you connect successfully, check if you can query the database of your project.
If you connect unsuccessfully, contact your system admin to arrange access.
If you want to understand more about connectionstring or create one, use the following site for template: http://www.connectionstrings.com/sql-server/
You can get the necessary database details by viewing the Properties of your database via "SQL Server Management Studio" (right click and select Properties --> View Connection Properties)
I met the same question. The key step is here.
I used vs 2013 update 4.
When you configured your SQL in azure, it generated a connect string.
I am getting the following exception when I am trying to connect to a web service
System.Data.SqlClient.SqlException: An attempt to attach an auto-named database for file DatabaseName.mdb failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share.
The connection string I am using is:
Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|WS_Assignment.mdb;uid=Admin;pwd="
providerName="System.Data.OleDb"
I am trying to access SQL Server on local system.
I have gone through a lot of articles and followed all the different methods. But I got no solution.
Can anyone help me out?
Before Question was EDITED:
are you deploying on a web server , instead of your localhost. If thats the case you need to publish the sql script in Server DB as servers dont allow attachDB file in your deployment and if thats the case then your problem is solved.
After Update
you can always try with fullpath and yes you need OLEDB call not sql make sure thats not the case with your .cs code
Correction in your question:
i am trying to access SQL server On local system
:
i dont see how you can do that with .mdb file; even if thats not the case make sure sql services are running properly in your system go to->start button->program files->microsoft sql server yourversion-> configuration manager-> check running services.
In your Solution Explorer, click on "Show All Files". then go to your App_Data folder and delete WS_assignment.mdb and then run your application.
Also, your provider is wrong
providerName="System.Data.SqlClient" is the right one.
Secondly, your database name should end in .mdf or .sdf for SQL Server.
So, your connection string will become:
<connectionStrings>
<add name="ConnectionStringName"
connectionString="Data Source=|DataDirectory|WS_Assignment.sdf"
providerName="System.Data.SqlClient"/>
</connectionStrings>
Check this.
http://msdn.microsoft.com/en-IN/library/5ybdbtte%28v=vs.71%29.aspx
using Access requires System.Data.OleDb library
I seem to be having a problem with Entity Framework code-first. I managed to make it create the database in my project folder in App_data and everything works well if I do not try to check the contents of the generated database in the Server Explorer.
If I do that and try to open the application I get this error:
Cannot open database "SellCars" requested by the login. The login failed.
Login failed for user 'Aly-PC\Aly'.
While this behavior may be normal (not really sure), even if I detach the db and close the connection in the server explorer and I run this application it still does not work but instead in throws this error:
One or more files do not match the primary file of the database. If you are attempting to attach a database, retry the operation with the correct files. If this is an existing database, the file may be corrupted and should be restored from a backup.
Cannot open database "SellCars" requested by the login. The login failed.
Login failed for user 'Aly-PC\Aly'.
Log file 'D:\Projects IDE\Visual Studio\MyWork\Websites\SellCars\SellCars\App_Data\SellCars.ldf' does not match the primary file. It may be from a different database or the log may have been rebuilt previously
This is my connection string:
<add name="CarsEntities"
connectionString="Data Source=.\SQLEXPRESS;AttachDbFilename='D:\Projects IDE\Visual Studio\MyWork\Websites\SellCars\SellCars\App_Data\SellCars.mdf';Initial Catalog=SellCars;Integrated Security=True;User Instance=True"
providerName="System.Data.SqlClient" />
I do not try to change anything inside of the database not even add any data but I still get these errors.
What should I do?
Add Aly-PC\Aly to the active directory users who can access the SQL server. Then add the SQL server login you just created to the database.