Windows Service access to SQL database

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Hello,

My Windows Service can't access to a local SQL database, I have no idea what is the problem, it connects well in console app with the same connection string.
My connectionString is

"Data Source=localhost;Initial Catalog=comp;Integrated Security=True";

("comp" is my database name)
My windows service is a Local System account.

Thanks for your answer!

Zoli

Posted 29-Oct-13 4:31am

borzola7

Updated 29-Oct-13 4:53am

coded007

v3

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ZurdoDev 29-Oct-13 10:34am

We need the error; however, it is likely that whatever account your service is running as does not have a sql login.

borzola7 29-Oct-13 10:55am

I am beginner so apologize me. How do you make sql login? If I start SQL Server Management Studio I always connect to localhost (servername), I don't know other way.
How do you connect your database to be accessable for window service with a connectorString like this: "server=ABC\\SQLEXPRESS; database=db1; uid=sa; password=sa" (I have seen it in a windows service example)

ZurdoDev 29-Oct-13 11:08am

You can add a new User under Security in Sql Management Studio or you can use Windows Authentication but then the account your service is running as needs a login.

borzola7 29-Oct-13 13:27pm

In the event log the service gives this error message: System.Data.SqlClient.SqlException (0x80131904): "The service can't start. The SELECT permission was denied on the object 'Company', database 'comp', schema 'dbo'."

ZurdoDev 29-Oct-13 13:41pm

Yes, permissions issue. Get with your db admin to fix it.

Ranjan.D 29-Oct-13 10:44am

Did you tried debugging. If not here's something you need to do

http://msdn.microsoft.com/en-us/library/system.diagnostics.debugger.launch(v=vs.110).aspx

borzola7 29-Oct-13 13:27pm

In the event log the service gives this error message: System.Data.SqlClient.SqlException (0x80131904): "The service can't start. The SELECT permission was denied on the object 'Company', database 'comp', schema 'dbo'."

Taha Akhtar 29-Oct-13 12:38pm

what error did you get? try replacing localhost with 127.0.0.1

borzola7 29-Oct-13 13:14pm

When I try to run service: "The Service on local computer started and then stopped ,Some services stop automatically if there are not in use by other services or programs"

The replacement helped a little, but now "SqlDataReader reader = command.ExecuteReader();" causes the same message.
In the event log: A szolgáltatás nem indítható el. System.Data.SqlClient.SqlException (0x80131904): "The service can't start. The SELECT permission was denied on the object 'Company', database 'comp', schema 'dbo'."

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borzola7 · Answer 1 · 2013-10-29T09:00:00

Solution 1

Thank you guys! You were really helpful! SQL authentication connection string was the solution. I had to learn giving users to databases in SQL and adding reading privileges. Now it work perfectly!

Best wishes,
Zoli

Posted 29-Oct-13 9:00am

borzola7