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This code declares a local variable called @key, issues a specialized UPDATE statement that increments the val column value by one, and stores the result in the variable @key . You re effectively both updating and selecting the sequence value at the same time in an atomic operation . Suppose that you want to automate the process of assigning keys to new rows using a trigger, and you also want to support multirow inserts . An AFTER trigger is not a good choice because the primary key will reject an attempt to insert multiple rows where the key values are not specified . Remember that an INSTEAD OF trigger is fired instead of the original modification; therefore, such a trigger will allow a multirow insert where the keys weren t specified . All rows will get the default value 0, and the trigger can generate a different key for each row . The trigger then inserts rows into T1 with newly generated keys, while the rest of the columns (only datacol in our case) can be grabbed from inserted .

At the time of this writing, the Apache Software Foundation s Cocoon is one of the most stable and feature-rich XML web publishing frameworks. User interface development with Cocoon involves the creation of XSL stylesheets and XSP pages. Since XSP is a technology currently limited to Cocoon, we will concentrate on the more generic, XSLT capabilities of Cocoon in this section. Figure 5.10 depicts the Cocoon processing flow.

the executable .dll file and a corresponding login with the EXTERNAL ACCESS (or UNSAFE) ASSEMBLY permission:

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:

// 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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