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1. Our first example is a straight error where we have defined an integer local variable. Within our error-handling block, after outputting a statement to demonstrate that we are within that block, we try to set a string to the variable. This is a standard error and immediately moves the execution to the CATCH block; the last SELECT is not executed.

A trigger is a specialized stored procedure that can execute either on a data modification, known as a Data Modification Language (DML) trigger, or can execute on a data model action, such as CREATE TABLE, known as a Data Definition Language (DDL) trigger. DML triggers are pieces of code attached to a specific table that are set to automatically run in response to an

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The computational costs for encryption raise the need to assess if encryption security benefits justify the performance impact of the added security that they provide in your application contexts Encrypting and signing data are very rich topics This section quickly introduces you to the basics of encrypting and signing data and has two goals First, it presents samples to get you started using these techniques Second, it provides a foundation so that you can go on and learn more about the rich ways that SSE enables the encrypting and signing of data The sample code for this section is in SettingUpEncSignDemosql, EncryptingDecryptingDatasql, and SigningDatasql..

DECLARE @Probs int BEGIN TRY SELECT 'This will work' SELECT @Probs='Not Right' SELECT 10+5, 'This will also work, however the error means it will not run' END TRY BEGIN CATCH SELECT 'An error has occurred at line ' + LTRIM(STR(ERROR_LINE())) + ' with error ' + LTRIM(STR(ERROR_NUMBER())) + ' ' + ERROR_MESSAGE() END CATCH 2. When we run the code, we will see the first statement and then the SELECT statement that executes when the error is caught. We use the system functions to display relevant information, which appears in Figure 11-48.

INSERT, DELETE, or UPDATE command. However, a DDL trigger is attached either to an action that occurs within a database or within a server. The first part of the chapter will look at DML triggers, followed by an investigation of DDL triggers.

SQL Server Express lets you encrypt data with a symmetric key, an asymmetric key, or a certificate You can sign data and verify that the data is unchanged since last signed with either a certificate or an asymmetric key A symmetric key uses the same secret value to both encrypt and decrypt data An asymmetric key uses public and private key pairs You can encrypt data or sign data with one member of a key pair and decrypt data or verify a signature for data with the other member of a key pair A certificate serves as a wrapper for a public asymmetric key Just as there are hierarchies for principals, securables, and permissions, there is also an encryption hierarchy Higher elements in the encryption hierarchy can secure lower elements The Service Master Key is at the top of the hierarchy.

Figure 11-48. An error is caught. 3. Our second example demonstrates nesting TRY...CATCH blocks and how execution can continue within the outer block when an error arises within the second block. We keep the same error and see the error message, The second catch block. But once this is executed, processing continues to And then this will now work. DECLARE @Probs int BEGIN TRY SELECT 'This will work' BEGIN TRY SELECT @Probs='Not Right' SELECT 10+5, 'This will also work, however the error means it will not run' END TRY BEGIN CATCH SELECT 'The second catch block' END CATCH SELECT 'And then this will now work' END TRY BEGIN CATCH SELECT 'An error has occurred at line ' + LTRIM(STR(ERROR_LINE())) + ' with error ' + LTRIM(STR(ERROR_NUMBER())) + ' ' + ERROR_MESSAGE() END CATCH 4. As expected, we see three lines of output, as shown in Figure 11-49. The code in the outer CATCH block doesn t run, as the error is catered to within the inner block.

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