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ImageMagick also supports a number of environment variables to control its behavior. These environment variables are defined in the user s shell and affect only the operation of ImageMagick programs started from that shell. Many system administrators will configure these environment variables in a user s shell profile, however, which means that every interactive shell will be initialized with them. Instead of including the full list of environment variables in this chapter, I recommend you refer to the ImageMagick documentation if you want to configure the behavior of ImageMagick further.

This recipe demonstrated nesting a TRY...CATCH within another TRY...CATCH. This allows you to add error handling around your error handling, in cases where you anticipate that this is necessary. Walking through the code, the first few lines of the stored procedure defined the input parameters for use with inserting into the HumanResources.Department table: CREATE PROCEDURE dbo.usp_INS_Department @Name nvarchar(50), @GroupName nvarchar(50) AS Next, the first level TRY block is begun with an attempt to INSERT the new row into the table: BEGIN TRY INSERT HumanResources.Department (Name, GroupName) VALUES (@Name, @GroupName) END TRY If this fails, the CATCH block contains another TRY block: BEGIN CATCH BEGIN TRY A statement is printed, and then another attempt is made to INSERT into the table, this time using a generic name of Misc instead of the original department name sent by the input parameter: PRINT 'The first department attempt failed.' INSERT HumanResources.Department (Name, GroupName) VALUES ('Misc', @GroupName) END TRY If this fails, the nested CATCH will print a second message telling the user that the Misc department for the specified group already exists: BEGIN CATCH PRINT 'A Misc department for that group already exists.' END CATCH END CATCH GO The stored procedure was then tested, using a department that already existed in the table. Because there is a UNIQUE constraint on the department name, the first INSERT failed, and control was passed to the CATCH block. The TRY block within the CATCH then successfully inserted into the table using the Misc department name. On a second execution of the stored procedure, both INSERTs failed, but were handled by returning a PRINT statement warning you about it.

h and /usr/local/include/netdev/devnameh will be used Consider what would happen if the following #include directives were used in resizec: #include <libxml2/xmlopsh> #include <netdev/devnameh> In this case, both header files are included as system header files, and gcc would therefore use the versions located under the /usr/local/include directory that you specified using I, even if you specified the working directory using the iquote option..

eginning with SQL Server 2005, Microsoft uses a new set of terminology to describe SQL Server security functionality, which separates the architecture into: Principals. These are objects (for example a user login, a role, or an application) that may be granted permission to access particular database objects. Securables. These are objects (a table or view, for example) to which access can be controlled Permissions. These are individual rights, granted (or denied) to a principal, to access a securable object Principals are the topic of this chapter, and securable and permissions are discussed in the next chapter. Principals fall into three different scopes: Windows principals are principals based on Windows domain user accounts, domain groups, local user accounts, and local groups. Once added to SQL Server and given permissions to access objects, these types of principals gain access to SQL Server based on Windows authentication. SQL Server principals are SQL Server-level logins and fixed server roles. SQL logins are created within SQL Server and have a login name and password independent of any Windows entity. Server roles are groupings of SQL Server instance-level permissions that other principals can become members of, inheriting that server role s permissions. Database principals are database users, database roles (fixed and user-defined), and application roles all of which I ll cover in this chapter. I ll start this chapter off with a discussion of Windows principals.

Windows principals allow access to a SQL Server instance using Windows authentication. SQL Server allows us to create Windows logins based on Windows user accounts or groups, which can belong either to the local machine or to a domain. A Windows login can be associated with a domain user, local user, or Windows group. When adding a Windows login to SQL Server, the name of the user or group is bound to the Windows account. Windows logins added to SQL Server don t require separate password logins; in that case, Windows handles the login authentication process. When users log on to SQL Server using Windows authentication, their current user account must either be identified as a login to the SQL Server instance, or they must belong to a Windows user group that exists as a login.

Multiple -I dir options can be specified. They are searched in the order specified, reading left to right.