I have database and webpages related to it are uploaded on server but not able to access the database from server but when run on local machine through VS2010 i was able to access it.
Asked Server Admin also about the problem but they told that everything is fine from server side there is problem in code they are saying.
The following error i'm getting:
Server Error in '/' Application.
Invalid object name 'Login'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Data.SqlClient.SqlException: Invalid object name 'Login'.
Source Error:
Line 20: SqlCommand com = new SqlCommand("select Password from Login where Username='" + Uname_txt.Text.Trim() + "'", con);
Line 21: con.Open();
Line 22: SqlDataReader dr = com.ExecuteReader();
Line 23: try
Line 24: {
If everything is working locally, then problem is definitely in how you've setup connecting to the database on the server.
So, look at connection string in web.config and make sure that it is setup properly (if using Integrated Security make sure appropriate APP POOL is allowed to access database).
Also, make sure Login table is indeed created in the database.
Once you do all that you have lots of things to follow up with:
Stop using reserved keywords in SQL expressions (Password, Login, etc) or at least wrap them in brackets like [Password].
Try to get in habit of referencing schema when working with tables (dbo.Login instead of just Login)
Extract queries like that in Stored procedures so that you are not vulnerable to SQL Injection
You have not posted the connection String, I suspect, you have not supplied the INITIAL CATALOG in connection string, because of which it is directly connected to Master Database and of course your table not exists in Master.
INITIAL CATALOG = should be added in your connection string. I hope this will help you.
Note: You can also use DATABASE = in connection string.
Related
I have few aspx pages and and few tables in database. Each page connects to respective table. The purpose of each page is the same, only some condition are different. When I develop I use different database for testing data and called it "Database_DEV1" to be easy to remember. Now a problem is that only one page connects to the database (Database_DEV1) with same connection string. Other pages throws error with message:
Cannot open database "Database" requested by the login. The login failed.
Login failed for user 'xxx'
Why does it connect to "Database" if I provided connection string that refers to Database_DEV1?
Is it possible that this kind of error may appear at all? Do I miss something? I checked connection string I provided.
It looks like page "remembers" something different for some reason. I tried simple SqlConnection class and it works, but dbml file not.
update
Problem is that that Context refers to folder:
// C:\Users\xxx\AppData\Local\Temp\Temporary ASP.NET Files\root\0f053840_shadow\2edebf24\5576\App_Code.whnwybua.dll
At first, application connects using context that is declared in dbml. But when I do some actions it tries to connect using context which refers to dll file I described above. Why is that?
I have a asp.net application deployed to Azure websites connecting to Azure SQL Database. This has been working fine for the last year, but last weekend I have started getting errors connecting to the database giving the following stacktrace.
[Win32Exception (0x80004005): Access is denied]
[SqlException (0x80131904): A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)]
This error comes and goes staying a few hours and then goes away for a few hours. The database is always accessible from my machine.
A few things that I have tried are:
Adding a "allow all" firewall rule (0.0.0.0-255.255.255.255) has no effect
Changing the connection string to use the database owner as credential has no effect.
what does have effect is to change the azure hosting level to something else. This resolves the issue temporarily and the website can access the database for a few hours more.
What could have have happened for this error to start showing up? The application hasn't been changed since August.
EDIT:
Azure support found that there was socket and port exhaustion on the instance. What the root cause for that is, is still unkown.
Craig is correct in that you need to implement SQLAzure Transient Fault Handling. You can find instructions here: https://msdn.microsoft.com/en-us/library/hh680899(v=pandp.50).aspx
From the article
You can instantiate a PolicyRetry object and wrap the calls that you
make to SQL Azure using the ExecuteAction method using the methods
show in the previous topics. However, the block also includes direct
support for working with SQL Azure through the ReliableSqlConnection
class.
The following code snippet shows an example of how to open a reliable
connection to SQL Azure.
using Microsoft.Practices.EnterpriseLibrary.WindowsAzure.TransientFaultHandling;
using Microsoft.Practices.EnterpriseLibrary.WindowsAzure.TransientFaultHandling.AzureStorage;
using Microsoft.Practices.EnterpriseLibrary.WindowsAzure.TransientFaultHandling.SqlAzure;
...
// Get an instance of the RetryManager class.
var retryManager = EnterpriseLibraryContainer.Current.GetInstance<RetryManager>();
// Create a retry policy that uses a default retry strategy from the
// configuration.
var retryPolicy = retryManager.GetDefaultSqlConnectionRetryPolicy();
using (ReliableSqlConnection conn =
new ReliableSqlConnection(connString, retryPolicy))
{
// Attempt to open a connection using the retry policy specified
// when the constructor is invoked.
conn.Open();
// ... execute SQL queries against this connection ...
}
The following code snippet shows an example of how to execute a SQL command with retries.
using Microsoft.Practices.EnterpriseLibrary.WindowsAzure.TransientFaultHandling;
using Microsoft.Practices.EnterpriseLibrary.WindowsAzure.TransientFaultHandling.AzureStorage;
using Microsoft.Practices.EnterpriseLibrary.WindowsAzure.TransientFaultHandling.SqlAzure;
using System.Data;
...
using (ReliableSqlConnection conn = new ReliableSqlConnection(connString, retryPolicy))
{
conn.Open();
IDbCommand selectCommand = conn.CreateCommand();
selectCommand.CommandText =
"UPDATE Application SET [DateUpdated] = getdate()";
// Execute the above query using a retry-aware ExecuteCommand method which
// will automatically retry if the query has failed (or connection was
// dropped).
int recordsAffected = conn.ExecuteCommand(selectCommand, retryPolicy);
}
The answer from Azure support indicated that the connection issues I was experiencing was due to port/socket exhaustion. This was probably caused by another website on the same hosting plan.
Some answers to why the symptoms were removed by changing hosting service level:
Changing the hosting plan helped for a while since this moved the virtual machine and closed all sockets.
Changing the hosting plan from level B to level S helped since azure limits the number of sockets on level B.
I'm having difficulty with an SQL query against Server 2008 from IIS7. I have a VB.NET class library which runs an update statement. The underlying code used to create the connection hasn't changed, but suddenly the query is failing in our testing and development environments. It does, however, still work against the same server/database using the slightly older code in our production environment.
I've tried setting the connection timeout in the web.config and I'm at a loss to explain the cause.
The basic structure of the query is:
Dim conn = New SqlConnection()
conn.ConnectionString = "Data Source=someserver\sqlexpress2008;Initial Catalog=DatabaseName;User ID=sa;Password=pass"
conn.Open()
Using cmd As SqlCommand = conn.CreateCommand()
cmd.CommandText = "UPDATE ..."
cmd.Parameters.AddWithValue("#UName", user.name)
cmd.ExecuteNonQuery() 'fails with error
End Using
The error is:
A transport-level error has occurred when sending the request to the
server. (provider: TCP Provider, error: 0 - An existing connection was
forcibly closed by the remote host.)
I've tried restarting IIS and the SQL server and I'm totally out of ideas. I just need a fix
You need to open the connection before calling SqlCommand.ExecuteNonQuery(). You do this by calling SqlConnection.Open().
Dim conn = New SqlConnection()
conn.ConnectionString = "Data Source=someserver\sqlexpress2008;Initial Catalog=DatabaseName;User ID=sa;Password=pass"
Using cmd As SqlCommand = conn.CreateCommand()
cmd.CommandText = "UPDATE ..."
cmd.Parameters.AddWithValue("#UName", user.name)
conn.Open()
cmd.ExecuteNonQuery() 'fails with error
conn.Close()
End Using
Also, ensure you database isn't in single user mode.
This helped another person who was stuck recently. You could examine the problem from the database server by setting up a SQL Server Profiler.
You can find lots of info about SQL Profiler by just googling around. Here's a site with a video that might help you get started. For starters, you would be able to see if the request is even reaching the database server.
This was a nightmare to track down. It turned out to be cause by a horrible quirk in VB.NET. Nullable datetimes seem to be coerced to DateTime.MinValue, which resulted in a DateTime.MinValue being inserted into an sql datetime. The fix was to check for either !property.HasValue && property.Value != DateTime.MinValue when setting the parameters for the command.
This is a network-level error. The database server is killing the connection for some reason. In order to troubleshoot this, I would open a connection using SSMS to the DEV and TEST servers and make sure that I can run simple queries w/o problems. It's unlikely that the issue is your library since you would be getting timeout or some other kind of errors.
as Lcarus, said, database server is killing the connection for unknown reason.
you can check the logs, to verfiy. Log path will be C:\Program Files\Microsoft SQL Server\<your instance>\MSSQL\LOG
from MSDN Blog MSDN Blog
this will occur when A connection is taken from the connection pool,
the application does not know that the physical connection is gone, an
attempt to use it is done under the assumption that the physical
connection is still there.
Firstly, I know that there are a lot of similar topics, but none seem to solve my problem.
I have inherited a project where the front-end is built in ASP.NET and the CMS is built in classic ASP. I'm in the process of setting up a local development environment where I've copied the database from the live server and am configuring the website to connect to my new local DB.
The ASP.NET part is connecting with the connection string Data Source=.\\SQLEXPRESS; Database=DBNAME; Trusted_Connection=True; but I had to mess about with Application Pools and Permissions.
I'm having a problem with getting the classic ASP part of the website to connect to the SQL database. The error I am recieving is:
Microsoft OLE DB Provider for ODBC Drivers error '80004005'
[Microsoft][ODBC SQL Server Driver][SQL Server]Cannot open database "DBNAME" requested by the login. The login failed.
/cms/connections/Conn.asp, line 18
The code in that file is:
12. Dim Conn_STRING, URL, mailHost
13. Conn_STRING = "Driver={SQL Server}; Server=.\SQLEXPRESS; Database=DBNAME; Trusted_Connection=True;"
15. Dim conn
16. set conn = Server.CreateObject("ADODB.Connection")
17. conn.ConnectionString = Conn_STRING
18. conn.Open
I know it's a permission problem or some sort, but I can't get to the bottom of it. I'll appreciate any help at all :)
hmmmm, well, the asp.net part is using SQLExpress, connected via an attached file. DBNAME in the first example is going to refer to a db file name in the actual asp.net project. It's been quite a long time since I last used classic ASP, but I'd be STUNNED if it supports this. You need to attach the db file to an actual sql server and use it that way.
server=mycomputername\sqlexpress; database=DBNAME; user id=username; password=password
You'll need to open your database in sql express mngmt studio
http://www.microsoft.com/download/en/details.aspx?id=7593
Go into your security settings for that user and set the default database to "dbname" (whatver your real dbname is of course)
Ensure your app pool is set to run under the user that has permissions to that database. It may just be easier to enable mixed mode authentication and create a sql user to connect to the database rather than messing around with windows authentication on an app pool.
You wil lof course need to change your connection string then to support the sql authentication if you go that route.
http://msdn.microsoft.com/en-us/library/ms143705%28v=sql.90%29.aspx
I'm talking about this error message that always appears everytime i lose my internet connection or everytime the server becomes offline:
A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: Shared Memory Provider, error: 40 - Could not open a connection to SQL Server)
I want to know the best way of displaying a friendly error message for this. Actually, this is what I did:
Try
Using conn As New SqlConnection(ConnectionStrings("ConnectionName").ConnectionString)
Dim command As SqlCommand = conn.CreateCommand()
conn.Open()
Dim transact As SqlTransaction = conn.BeginTransaction()
command.Transaction = transact
Try
'codes to execute
transact.commit()
Catch ex As SqlException
transact.rollback()
'display error
End Try
End Using
Catch ex As SqlException
'display friendly error message
End Try
I need to do this everytime I use a sqlconnection. Is there a way to make a single block of code that could handle all of the instance of this error on all of my pages?
If you need to handle your errors on a single block, the best place is the global.asax Application_Error method. There you can check the exception through:
Exception ex = Server.GetLastError();
That's the most practical way, I think. Sometimes you'll need to display different error message or different approach even though they have the same exception.
You can also try this article https://web.archive.org/web/20211020134127/https://www.4guysfromrolla.com/articles/081209-1.aspx but note that redirection is sometimes not a good option to say that something went wrong in your website especially in a page where user will fill-out a form, you don't want him to lose his progress, do you?
If you are using SqlDataSource http://forums.asp.net/t/978920.aspx/1