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the executable .dll file and a corresponding login with the EXTERNAL ACCESS (or UNSAFE) ASSEMBLY permission:
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USE master; CREATE ASYMMETRIC KEY CLRUtilitiesKey FROM EXECUTABLE FILE = 'C:\CLRUtilities\CLRUtilities\bin\Debug\CLRUtilities.dll'; -- Create login and grant it with external permission level CREATE LOGIN CLRUtilitiesLogin FROM ASYMMETRIC KEY CLRUtilitiesKey GRANT EXTERNAL ACCESS ASSEMBLY TO CLRUtilitiesLogin;
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CLR code inside SQL Server is always invoked in the context of the process account . If you would like to use the calling user s identity instead for your CLR code that performs an action outside SQL Server, you have to obtain an impersonation token through the WindowsIdentity property of the SqlContext object . The WindowsIdentity property returns a WindowsIdentity object instance . It represents the Windows (OS) identity of the caller (or null if the client was authenticated using SQL Server Authentication) . To be able to access this property, an assembly has to be marked with the EXTERNAL_ACCESS or UNSAFE permission set . You should be aware of all implications of setting the permission set for the assembly to EXTERNAL_ACCESS or UNSAFE and setting the database option TRUSTWORTHY to ON . Going deeper with security would be outside the scope of this book, but just be aware: the UNSAFE permission set allows assemblies unrestricted access to resources, both within and outside SQL Server, and also calling unmanaged code . From the example in this section, you can learn the technicalities of creating CLR triggers, but you can also get an impression of the implications of using CLR code inside a database imprudently . Remember that Appendix A provides the instructions required to develop, build, deploy, and test your .NET code . Here you will be provided with the trigger s code, including explanations, and instructions to register the trigger in the database and test it . Here s the C# code that defines the trg_GenericDMLAudit trigger:
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// trg_GenericDMLAudit Trigger // Generic trigger for auditing DML statements // trigger will write first 200 characters from all columns // in an XML format to App Event Log [SqlTrigger(Name = @"trg_GenericDMLAudit", Target = "T1", Event = "FOR INSERT, UPDATE, DELETE")] public static void trg_GenericDMLAudit() { // Get the trigger context to get info about the action type SqlTriggerContext triggContext = SqlContext.TriggerContext; // Prepare the command and pipe objects SqlCommand command; SqlPipe pipe = SqlContext.Pipe; // Check type of action switch (triggContext.TriggerAction) {
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Inside Microsoft SQL Server 2008: T-SQL Programming
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case TriggerAction.Insert: // Retrieve the connection that the trigger is using using (SqlConnection connection = new SqlConnection(@"context connection=true")) { connection.Open(); // Collect all columns into an XML type, cast it // to nvarchar and select only a substring from it // Info from Inserted command = new SqlCommand( @"SELECT 'New data: ' + REPLACE( SUBSTRING(CAST(a.InsertedContents AS NVARCHAR(MAX)) ,1,200), CHAR(39), CHAR(39)+CHAR(39)) AS InsertedContents200 FROM (SELECT * FROM Inserted FOR XML AUTO, TYPE) AS a(InsertedContents);", connection); // Store info collected to a string variable string msg; msg = (string)command.ExecuteScalar(); // Write the audit info to the event log EventLogEntryType entry = new EventLogEntryType(); entry = EventLogEntryType.SuccessAudit; // Note: if the following line would use // Environment.MachineName instead of "." to refer to // the local machine event log, the assembly would need // the UNSAFE permission set EventLog ev = new EventLog(@"Application", ".", @"GenericDMLAudit Trigger"); ev.WriteEntry(msg, entry); // send the audit info to the user pipe.Send(msg); } break; case TriggerAction.Update: // Retrieve the connection that the trigger is using using (SqlConnection connection = new SqlConnection(@"context connection=true")) { connection.Open(); // Collect all columns into an XML type, // cast it to nvarchar and select only a substring from it // Info from Deleted command = new SqlCommand( @"SELECT 'Old data: ' + REPLACE( SUBSTRING(CAST(a.DeletedContents AS NVARCHAR(MAX)) ,1,200), CHAR(39), CHAR(39)+CHAR(39)) AS DeletedContents200 FROM (SELECT * FROM Deleted FOR XML AUTO, TYPE) AS a(DeletedContents);", connection); // Store info collected to a string variable string msg; msg = (string)command.ExecuteScalar();
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