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This key is installed when you create an SSE instance on a computer The Service Master Key is unique to a server instance Each database within a server can have its own Database Master Key The Service Master Key secures the Database Master Key Certificates and asymmetric keys are at the same level in the encryption hierarchy right below the Database Master Key SQL Server Express can use the Database Master Key to secure both asymmetric keys and certificates Both certificates and asymmetric keys can secure symmetric keys Additionally, one symmetric key can secure another symmetric key You can create, drop, and modify certificates, asymmetric keys, and symmetric keys with CREATE, DROP, and ALTER statements The CREATE DDL statements let you specify such properties as encryption algorithms, the length of your encryption key, and passwords (if you use them).

Note Unlike stored procedures, you cannot manually make a trigger run, you cannot use parameters with

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The property settings for symmetric keys, asymmetric keys, and certificates are distinct Review the Books Online documentation for the details about which property settings are available and the proper syntax for making the settings Specialized T-SQL functions facilitate encrypting and decrypting data with symmetric keys, asymmetric keys, and certificates that you generate with CREATE DDL statements For example, the EncryptByCert and DecryptByCert functions let you encrypt and decrypt character sequences with certificates Parallel functions are available for symmetric keys and asymmetric keys that you generate with CREATE ASYMMETRIC KEY and CREATE SYMMETRIC KEY statements The EncryptByPassPhrase and DecryptByPassPhrase functions substantially simplify the encrypting and decrypting of data with symmetric keys One special advantage of these functions is that you do not need to previously invoke a CREATE SYMMETRIC KEY statement before you can invoke the functions.

Figure 11-49. An error is caught in a nested batch. 5. This time, we see how our T-SQL code can be successfully precompiled and execution started. Then when we try to display results from a temporary table that doesn t exist, the CATCH block does not fire, as execution terminates immediately. DECLARE @Probs int BEGIN TRY SELECT 'This will work' BEGIN TRY SELECT * FROM #Temp 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 6. When the code is run in the Messages tab, we see the following output, detailing one row has been returned, which comes from the first SELECT statement. We then see the SQL Server error. Looking at Figure 11-50, you also see just the first SELECT statement output. (1 row(s) affected) Msg 208, Level 16, State 0, Line 5 Invalid object name '#Temp'.

Triggers have many uses Perhaps the most common for a DML trigger is to enforce a business rule; for example, when a customer places an order, check that they have sufficient funds or that you have enough stock; if any of these checks fail, you can complete further actions or return error messages and roll back the update DML triggers can be used as a form of extra validation, for example, to perform quite complex checks on data that a constraint could not achieve Keep in mind that using constraints instead of triggers gives you better performance, but triggers are the better choice when dealing with complex data validation Another use for a DML trigger is to make changes in another table based on what is about to happen within the original triggered table.

In addition, you must explicitly open a symmetric key created with a CREATE SYMMETRIC KEY statement before you can use the key, but the EncryptByPassPhrase and DecryptByPassPhrase functions have no such requirement SQL Server Express automatically makes a symmetric key available whenever you invoke either function Additionally, you can explore certificates and keys with the system catalog views Three system catalog views for keys and certificates are sysasymmetric_keys, syscertificates, and syssymmetric_keys These views are useful for determining if a key or certificate already exists.

7. The final example demonstrates how to reraise the same error that caused the CATCH block to fire. Recall with RAISERROR it is only possible to list a number or a local variable. Unfortunately, it is not possible to call the relevant function directly or via a SELECT statement. It is necessary to load the values into local variables. DECLARE @Probs int 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 DECLARE @ErrMsg NVARCHAR(4000) DECLARE @ErrSeverity INT DECLARE @ErrState INT SELECT 'Blimey! An error' SELECT @ErrMsg = ERROR_MESSAGE(), @ErrSeverity = ERROR_SEVERITY(), @ErrState = ERROR_STATE(); RAISERROR (@ErrMsg,@ErrSeverity,@ErrState) END CATCH

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