Checking if Database is attached or not

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Hi,
How can I check if my SQL Server Database is attached to the instance of SQL Server or not. I want to check it at run time and if sa has detached it, I want to show a message. Please give me Vb.Net code if possible.

Thanks

Posted 11-Mar-12 21:21pm

Furqan Sehgal

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OriginalGriff · Accepted Answer · 2012-03-11T22:08:00

Solution 1

This lists all the connected DBs:

VB

Using con As New SqlConnection(strConnectInstance)
	con.Open()
	Using cmd As New SqlCommand("sp_databases", con)
		cmd.CommandType = CommandType.StoredProcedure
		Dim read As SqlDataReader = cmd.ExecuteReader()
		While read.Read()
			Console.WriteLine(DirectCast(read("DATABASE_NAME"), String))
		End While
	End Using
End Using

If your DB name is in the list, it's attached.

Posted 11-Mar-12 22:08pm

OriginalGriff

Comments

Furqan Sehgal 12-Mar-12 4:18am

I added at the top
Dim strConnectInstance = ".\sqlexpress" and ran your given code but it returns error "Format of the initialization string does not conform to specification starting at index 0." on the Using line

OriginalGriff 12-Mar-12 4:50am

Try
"Data Source=.\SQLEXPRESS;Integrated Security=True"
or replace the '.' with your server PC name: in my case, I would use
"Data Source=GRIFFPC\SQLEXPRESS;Integrated Security=True"

Furqan Sehgal 12-Mar-12 5:10am

It resolved that error ! Thanks. I tried to get them in a listbox
using ListView1.Items.Add(DirectCast(read("DATABASE_NAME"), String))
but it did not show anything nor showed any errors.......

OriginalGriff 12-Mar-12 5:32am

Strange - I just added a ListView and tried it here - I got the list in both the output pane and the listview.
Have you tried putting a breakpoint on the "Dim read as SqlData..." line and stepping through?
As a bare minimum you should get "master", "model", and "msdb" listed as they are present in all SQL server instances.

Furqan Sehgal 12-Mar-12 5:38am

Really strange ! it did not show either

OriginalGriff 12-Mar-12 5:40am

Try the breakpoint - see if you are getting anything back.

Furqan Sehgal 12-Mar-12 5:41am

I added a message box in while loop, it did not show anything. It means the loop is not beginning. Do I need to give credentials to connect to server?

Furqan Sehgal 12-Mar-12 5:49am

breakpoint gives "Nothing"
The value of read is nothing

OriginalGriff 12-Mar-12 5:55am

It is possible that the server instance needs credentials.
Try setting up a connection in VS with the Server Explorer pane:
1) Open Server Explorer.
2) Right click "Data connections" and select "Add connection"
3) In the dialog that follows, select your DataSource, and database, specify the security info, and press the "Test connection" button.
4) When the connection works, press "OK"
5) Highlight your database in the Server Explorer pane, and look at the Properties pane. A working example of the connection string will be shown, which you can copy and paste into your app or config file.
All you need to do is remove the "InitialCatalog" bit and it should work.

Which version of SQL server are you using?

Furqan Sehgal 12-Mar-12 6:00am

Yes that worked ! Thank you very very much. I gave my sa credentials and that is all.......... Thanks again

OriginalGriff 12-Mar-12 6:08am

You're welcome!