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 have created a web service which is saving some data into to db. But I am getting this error:
Cannot open database "test" requested by the login. The login failed. Login failed for user 'xyz\ASPNET'.
My connection string is
Data Source=.\SQLExpress;Initial Catalog=IFItest;Integrated Security=True
Well, the error is pretty clear, no? You are trying to connect to your SQL Server with user "xyz/ASPNET" - that's the account your ASP.NET app is running under.
This account is not allowed to connect to SQL Server - either create a login on SQL Server for that account, or then specify another valid SQL Server account in your connection string.
Can you show us your connection string (by updating your original question)?
UPDATE: Ok, you're using integrated Windows authentication --> you need to create a SQL Server login for "xyz\ASPNET" on your SQL Server - or change your connection string to something like:
connectionString="Server=.\SQLExpress;Database=IFItest;User ID=xyz;pwd=top$secret"
If you have a user "xyz" with a password of "top$secret" in your database.
Either: "xyz\ASPNET" is not a login (in sys.server_principals)
Or: "xyz\ASPNET" is set up but not mapped to a user in the database test (sys.database_principals)
I'd go for the 2nd option: the error message implies the default database is either not there or no rights in it, rather than not set up as a login.
To test if it's set up as a login
SELECT SUSER_ID('xyz\ASPNET') -- (**not** SUSER_SID)
If NULL
CREATE LOGIN [xyz\ASPNET] FROM WINDOWS
If not NULL
USE test
GO
SELECT USER_ID('xyz\ASPNET')
If NULL
USE test
GO
CREATE USER [xyz\ASPNET] FROM LOGIN [xyz\ASPNET]
I had this problem and what solved it for me was to:
Go to the Application pools in the IIS
Right click on my project application pool
In Process Model section open Identity
Choose Custom account option
Enter your pc user name and password.
For me the database was not created and EF code first should have created it but always endet in this error. The same connection string was working in aspnet core default web project. The solution was to add
_dbContext.Database.EnsureCreated()
before the first database contact (before DB seeding).
The best solution for the login problem is to create a login user in sqlServer. Here are the steps to create a SQL Server login that uses Windows Authentication (SQL Server Management Studio):
In SQL Server Management Studio, open Object Explorer and expand the folder of
the server instance in which to create the new login.
Right-click the Security folder, point to New, and then click Login.
On the General page, enter the name of a Windows user in the Login name box.
Select Windows Authentication.
Click OK.
For example, if the user name is xyz\ASPNET, then enter this name into Login name Box.
Also you need to change the User mapping to allow access to the Database which you want to access.
Most times, it's not a login issue, but an issue with creating the database itself. So if there is an error creating your database, it would not be created in the first place. In which case if you tried to log in, regardless of the user, login would fail. This usually happens due to logical misinterpretation of the db context.
Visit the site in a browser and REALLY read those error logs, this can help you spot the problem with you code (usually conflicting logic problems with the model).
In my case, the code compiled fine, same login problem, while I was still downloading management studio, I went through the error log, fixed my db context constraints and site started running fine....meanwhile management studio is still downloading
This Works for me.
Go to SQL Server >> Security >> Logins and right click on NT AUTHORITY\NETWORK SERVICE and select Properties
In newly opened screen of Login Properties, go to the “User Mapping” tab.
Then, on the “User Mapping” tab, select the desired database – especially the database for which this error message is displayed.
Click OK.
Read this blog.
http://blog.sqlauthority.com/2009/08/20/sql-server-fix-error-cannot-open-database-requested-by-the-login-the-login-failed-login-failed-for-user-nt-authoritynetwork-service/
It also happen when you type wrong name of DB
ex : xxx-db-dev to xxx-dev-db
Sometime, it's just a stupid mistake . I take about more than 1 hours to find out this :( because i just try alot of difficult thing first
The Issue
The error presents itself as a message similar to this:
Cannot open database "DATABASE NAME" requested by the login. The login
failed. Login failed for user XYZ.
The error cannot usually be rectified by a simple Visual Studio or full-computer restart.
The error can also be found as a seemingly locked database file.
The Fix
The solution is laid in the following steps. You will not lose any data in your database and you should not delete your database file!
Pre-requisite: You must have installed SQL Server Management Studio (Full or Express)
Open SQL Server Management Studio
In the "Connect to Server" window (File->Connect object explorer) enter the following:
Server type : Database Engine
Server name : (localdb)\v11.0
Authentication : [Whatever you used when you created your local db. Probably Windows Authentication).
Click "Connect"
Expand the "Databases" folder in the Object Explorer (View->Object Explorer, F8)
Find your database. It should be named as the full path to your database (.mdf) file
You should see it says "(Pending Recovery)" at the end of the database name or when you try to expand the database it won't be able to and may or may not give you an error message.
This the issue! Your database has crashed essentially..
Right click on the database then select "Tasks -> Detach...".
In the detach window, select your database in the list and check the column that says "Drop Connections"
Click OK.
You should see the database disappear from the list of databases. Your problem should now be fixed. Go and run your application that uses your localdb.
After running your application, your database will re-appear in the list of databases - this is correct. It should not say "Pending recovery" any more since it should be working properly.
The source of the solution: https://www.codeproject.com/Tips/775607/How-to-fix-LocalDB-Requested-Login-failed
I tried to update the user, and it worked. See the command below.
USE ComparisonData// databaseName
EXEC sp_change_users_login #Action='update_one', #UserNamePattern='ftool',#LoginName='ftool';
Just replace user('ftool') accordingly.
I had this problem when I created a WPF .NET Core + Entity Framework Core project and then cloning it on a a new laptop.
Using:
update-database
in the package manager console simply solved it.
To open package manager console go to:
Tools-> Nuget Package Manager -> Package Manager console
I used Windows authentication to connect to local database .mdf file and
my local server was sql server 2014.
My problem solved using this connection string:
string sqlString = " Data Source = (LocalDB)\\MSSQLLocalDB;" + "AttachDbFilename = F:\\.........\\myDatabase.mdf; Integrated Security = True; Connect Timeout = 30";
In my case it is a different issue. The database turned into single user mode and a second connection to the database was showing this exception.
To resolve this issue follow below steps.
Make sure the object explorer is pointed to a system database like master.
Execute a exec sp_who2 and find all the connections to database ‘my_db’. Kill all the connections by doing KILL { session id } where session id is the SPID listed by sp_who2.
USE MASTER;
EXEC sp_who2
Alter the database
USE MASTER;
ALTER DATABASE [my_db] SET MULTI_USER
GO
I ran into this issue when attempting to write to the default database provided in the asp.net mvc template. This was due to the fact that the database hadn't been created yet.
To create the database and make sure that it is accessible follow these steps:
Open up the Package manager console in Visual Studio
Run the command "update-database"
This will create the database an run all the necessary migrations on it.
I have not seen this mentioned in the previous issues, so let me throw out another possibility. It could be that IFItest is not reachable or simply does not exist. For example, if one has a number of configurations, each with its own database, it could be that the database name was not changed to the correct one for the current configuration.
NB: If using a windows service to host the webservice.
You have to insure that your webservice is using the right Log on account to connect to SQL Server.
Open services(I assume the windows service has been install)
Right click on the service and goto properties.
Click on "Log On" Tab
Click on "This account" radio button
Click "Browse"
Enter Pc user name in Text Field and click "Check Name" Button to the right.
Click on text in Text Field, press "OK" button
enter login password and Apply
Inspired by cyptus's answer I used
_dbContext.Database.CreateIfNotExists();
on EF6 before the first database contact (before DB seeding).
If you haven't created the database in your server you will get the same login error.Make sure that the database exist before you login.
it's not a login issue most times. The database might not have been created. To create the database, Go to db context file and add this.Database.EnsureCreated();
The best option would be to use Windows integrated authentication as it is more secure than sql authentication. Create a new windows user in sql server with necessary permissions and change IIS user in the application pool security settings.
I found that I also had to set the UserMapping option when creating a new login and this solved the problem for me. Hope that helps anyone that also found themselves stuck here!
Edit: Setting the login as db owner solved the next problem, too
Some times this trouble may appear if you open this db in another sql server (as example, you launch sql managment studio(SMS) and add this db), and forget stop this server. As result - you app try to connect with user already connected in this db under another server. To fix that, try stop this server by Config. dispatcher sql server.
My apologies about bad english.
Kind regards, Ignat.
In my case the asp.net application can usually connect to database without any problems. I noticed such message in logs. I turn on the SQL server logs and I find out this message:
2016-10-28 10:27:10.86 Logon Login failed for user '****'. Reason: Failed to open the explicitly specified database '****'. [CLIENT: <local machine>]
2016-10-28 10:27:13.22 Server SQL Server is terminating because of a system shutdown. This is an informational message only. No user action is required.
So it seems that server was restarting and that SQL server whad been shutting down a bit earlier then ASP.NET application and the database was not available for few seconds before server restart.
Even if you've set the login as DB owner and set the user mapping for the database that will use the login, check that the actual DB user (not just the login) has the role of 'owner'.
In my case, I was running a Windows Service under "System" identity. The error was:
System.Data.SqlClient.SqlException (0x80131904):
Cannot open database "MyDbName" requested by the login. The login failed.
Login failed for user 'MYDOMAINNAME\HOSTNAME$'.
The problem is that the error is very misleading. Even after I added 'MYDOMAINNAME\HOSTNAME$' login to the database, and granted this login sysadmin access and added a user for that login on my target database, and made that user dbowner, I was still getting the same error.
Apparently I needed to do the same for 'NT AUTHORITY\SYSTEM' login. After I did that, I was able to login without a problem. I don't know why the error message complains about 'MYDOMAINNAME\HOSTNAME$'. I deleted that login and the corresponding user and everything still works.
When using EF Code First, make sure the database exists. You could run the update-database command first.
If none of the above solution is working.
I encountered with the same error message but my issue was completely different. I had just restore my database and the database was in restoring mode. So if your database is in rstoring mode just apply following query.
RESTORE DATABASE MyDatabase
FROM DISK = 'pathToYourDbBackup\MyDatabase.bak'
WITH REPLACE,RECOVERY
I had this happen to me when I deleted the DB and forgot to recreate it. It happens sometimes, since Database folder needs refresh.
If you didn't have any problems before and you get this error only in the package manager console, you don't need to do anything special. Just open the sql server object explorer window and connect and run the command again in the console.
I have developed c# WPF application, I am using MDF file for database,
my connection string looks like :
Data
Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\appDataBase.mdf;Integrated
Security=True;Connect Timeout=30
here I am replacing |DataDirectory| with user's appdata folder.
the database file is in user's appdata folder, I created a setup which
copies .mdf file to _users appdata folder when I install it in
client's computer, it works perfectly
but when I uninstalls and
reinstall it, I am not able to connect that file, getting the error:
Can't open database
"C:/users/myusername/appdata/roaming/myapplication/database/appDataBase.mdf"
requested by login, login failed, login failed for user..
File is there, but somehow it is used by SQL server and can't
open it. also while starting application every time I am creating
backup of that file, that one also failing with error
System.IO.IOException: The process cannot access the file
'C:\Users\myusername\AppData\Roaming\myapplication\Database\appDataBase.mdf'
because it is being used by another process.
Can anybody give me exact solution, because i have to use localdb only on my client computer , i don't want them let to do any extra configuration for installation of my app, i.am still facing iasue after i changed my code to close db connection on main window closing event.
This type of things happens because one of your object which is using that database is still running in the background so please dispose all the database related instance also dispose and close all the database related object in catch().
Try catch will help you to detect exact line number where you are getting error and also show due to which object you are getting error.
If you want to check why this is happening then open task manager and look out for services there you definitely find service which is holding object for database.
I need to access a view on an oracle server with an ASP.NET website. It works if I debug the website through visual studio(press F5 in VS2012), but when I go to the version hosted on my local IIS (LocalHost/) I get this error:
Oracle.DataAccess.Client.OracleException: ORA-12154: TNS:could not resolve the connect identifier specified
A lot of the information I'm finding is related to the deprecated System.Data.OracleClient and I'm using Oracle.DataAccess.dll File version 4.112.3.0, Assembly version 2.112.3.0.
I set the AppPool it's running in to Enable 32-Bit Application=True based on some other people with a similar issue, I think everything else is default settings.
I've tried using the gacutil to make sure it is installed in the gac.
I also made a small winForms application that works and can access the data.
I've tried a couple connection strings:
This one works:
"Data Source=SOURCE;Persist Security Info=True;Password=****;User Id=****;"
This one doesn't work, I can't figure out a valid SERVICE_NAME:
"user id=****;password=****;data source=(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=****)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=****)));"
I always get this error:
Oracle.DataAccess.Client.OracleException: ORA-12514: TNS:listener does not currently know of service requested in connect descriptor
Places I've looked for SERVICE_NAME
I checked the connection I was able to establish with the first connection string and the SERVICE_NAME was either blank or sys$users depending on the query I ran.
I found three files named tnsnames.ora; one was completely blank, the SERVICE_NAME in the other two were Worker and <database service name>.
NOTE: I don't have access to the server, just credentials for this one view.
I found the SERVICE_NAME with this: select sys_context('userenv','db_name') from dual; and used the second connection string from the question:
"user id=****;password=****;data source=(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=****)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=****)));"
Thanks for all the help.
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.