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In SQL Server 2005, the WITH EXECUTE AS clause allows you to specify the security context that a stored procedure executes under, overriding the default security of the stored procedure caller. In this case, security context refers to the permissions of the user executing the stored procedure.

Nothing is stopping you from using more than one invocation of the draw command-line option. In fact, this is sometimes required for instance, if you want to change the color you re filling shapes with, you ll have to use more than one command. The following command keeps the stick-figure man blue but makes the text red: convert -fill blue -font mailrays.ttf -pointsize 96 -draw "circle 100,100 125,125 rectangle 65,150 135,300" -fill red -draw "text 200,300 Water" input.jpg output.jpg This gives you the result shown in Figure 7-60.

You can get the address of a label defined in a current function using the operator && (a unary operator, for you language lawyers). The value has type void *. The label address is a constant value it can be used wherever a constant of that type is valid: void *ptr; ptr = &&foo; To use this value, you need to be able to jump to it. With a normal label, you might say goto ptr;. However, with a label used as a value, you use a computed goto statement: goto *ptr; Any expression that evaluates to the type void * is allowed. One way to use these computed gotos is to initialize static arrays that will serve as a jump table: static void *jump[] = { &&f, &&g, &&h }; In this case, f, g, and h are labels to which code jumps at runtime. To use one, you index into the array and select the label. The code to do this might resemble the following: goto *array[i]; You cannot use computed gotos to jump to code in a different function, primarily because attempting to do so subverts (or, perhaps, abuses) the local label feature described in the previous section. Store the label addresses in automatic variables and never pass such an address as an argument to another function.

In SQL Server 2000, a stored procedure was always executed using the permissions of the caller. In SQL Server 2005, however, you now have the option to execute a stored procedure under the security context of the caller (the 2000 default), the person who authored or last altered the procedure, a specific login (if you have IMPERSONATE permissions for that person s login), or the owner of the stored procedure. First, let me present you with a quick aside about caller permissions and ownership chaining. An ownership chain occurs when an object, such a stored procedure or view, is created and used to perform an INSERT, UPDATE, DELETE, or SELECT against another database object. If the schema of the stored procedure object is the same as the schema of the object referenced within, SQL Server only checks that the stored procedure caller has EXECUTE permissions to the stored procedure. Again, this ownership chaining only applies to the INSERT, UPDATE, DELETE, or SELECT commands. This is why stored procedures are excellent for securing the database as you can grant a user access to execute a stored procedure without giving them access to the underlying tables. An issue arises, however, when you are looking to execute commands that are not INSERT, UPDATE, DELETE, or SELECT. In those situations, even if a caller has EXECUTE permissions to a stored procedure that, for example, truncates a table using the TRUNCATE TABLE command, he or she must still have permissions to use the TRUNCATE TABLE command in the first place. For example, the following stored procedure is created, which deletes all data from a table:

Like other constraint types, you can add a CHECK constraint to an existing table using ALTER TABLE and ADD CONSTRAINT. The syntax is as follows: ALTER TABLE table_name WITH CHECK | WITH NOCHECK ADD CONSTRAINT constraint_name CHECK ( logical_expression ) Table 4-13 details the arguments of this command. Table 4-13. ALTER TABLE...ADD CONSTRAINT (Check) Arguments