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AS EXTERNAL NAME AssemblyPermissionsExample. [Apress.SqlAssemblies.10.AssemblyPermissionsExample].ReadWebPage; GO EXEC uspReadWebPage 'http://www.apress.com/'; Since the assembly accesses the Internet, we need the EXTERNAL_ACCESS SQL Server permission set. When this script is run, you should see the HTML source for the Apress web site in the results pane in Management Studio. However, if you run the example with a different web page, you will see an error message. For example, if you run the following command: EXEC uspReadWebPage 'http://www.JulianSkinner.com/' you will see this error message: Request for the permission of type 'System.Net.WebPermission, System, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' failed. By insisting on having assemblies signed with strong names or certificates, DBAs can use CAS in this way to control the precise permissions available to SQL assemblies, without writing a single line of code. However, developers can also make use of CAS to ensure that their code isn t abused by code that calls into it, and we ll spend most of the rest of the chapter looking at how to use CAS in .NET code. However, first we need to explain how CAS permissions combine within a chain of method calls.

'Alter the principal database to set the partner strSQL = "ALTER DATABASE " & strDatabaseName & _ " SET PARTNER = '" & txtMirrorEndPoint.Text & "'" boolError = ExecuteNonQuery(strConnectionStringPrincipal, strSQL) If (boolError) Then MsgBox("Error setting partner. Exiting setup.") SetCursorBack() Exit Sub Else MsgBox("Success! Set partner on the principal.") End If

Figure 12-18. Setting standard trace properties I usually just configure Trace name and set the trace to Save to file on this screen. I do, however, set the Use the template value to Default, since it gives basic coverage of T-SQL and stored-procedure events. Additional event types added by the template can be removed. Figure 12-19 shows the Events Selection tab, from which any kind of event can be selected for monitoring. Although there are literally dozens of different events to capture, fortunately you need only concentrate on the two shown in Table 12-4. Table 12-4. Important Profiler Event Types

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'Check to see if they want to use a witness. If checkWitness.Checked = True Then 'Set Witness strSQL = "ALTER DATABASE " & strDatabaseName & _ " SET WITNESS = '" & txtWitnessEndPoint.Text & "'" boolError = ExecuteNonQuery(strConnectionStringPrincipal, & _ strSQL) If (boolError) Then MsgBox("Error setting witness. Exiting setup.") SetCursorBack() Exit Sub Else MsgBox("Success! Set witness on the principal.") End If

Indicates that a stored procedure has completed execution. Indicates that a T-SQL statement has completed execution.

The actual permissions any assembly receives are dependent on a couple of things First, most assemblies will belong to more than one code group, so the permissions received will be the union of the permission sets for all the code groups that the assembly matches, on all levels that apply This behavior can be changed by marking the assembly as exclusive and/or levelfinal If you want to ensure that an assembly receives exactly the permissions of a specific code group, mark that group as both exclusive and level-final Second, assemblies are very frequently called from other assemblies, in a long chain of method calls, and the caller and callee very likely have different permission sets This is where code access security at the programmatic level comes in There are four actions that .

End If Setting the partners turns on mirroring, so the next step in the sample is to start inserting data and displaying the status of the mirror. The code uses a timer control to wake up, insert the data, and check the status of the mirror. To check the status, the code queries the mirror_state_desc column for database mirroring in SQL Server s catalog views. This column will return back SYNCHRONIZED, SUSPENDED, or the other states that database mirroring can be in. The code also queries the principal to ask what role the principal is currently playing, such as PRINCIPAL or MIRROR, just in case the user failed over the application. The code to insert data and retrieve the status is as follows:

I ll select these event types to demonstrate the kind of data that gets reported, which you can see in Figure 12-20.

Dim strSQL As String = "" Dim boolError As Boolean = False strConnectionStringPrincipal = "Initial Catalog = " & _ strDatabaseName & _ ";Data Source = " & strPrincipalName & ";Trusted_Connection=Yes;" If UCase(strDatabaseName) = "PUBS" Then 'Insert data into pubs 'Increment the counter iPubsCounter += 1 strSQL = "INSERT INTO [publishers] (pub_id, pub_name, city, & _ state, country) VALUES ('" & CStr(iPubsCounter) & _ "','Test','Test','WA','Test')" boolError = ExecuteNonQueryForMirror(& _ strConnectionStringPrincipal, strSQL) If (boolError) Then lblDataFlowText.Text = "Error inserting data." Else lblDataFlowText.Text = "Added publisher #" & iPubsCounter End If End If

'Try to query the principal to get status of database mirroring Dim strReturnValue As String = "" Dim strSQL As String = "" strConnectionStringPrincipal = "Initial Catalog = Master" & _ ";Data Source = " & strPrincipalName & ";Trusted_Connection=Yes;"

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