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In this chapter, I presented a full demonstration of how to write a CGI and command-line application using Perl and ImageMagick s PerlMagick. In the next three chapters, I ll demonstrate three more examples of applications using ImageMagick one in C, one in Ruby, and one in PHP These demonstrations don t intend to show off all that is possible in these pro. gramming interfaces, as was done in the command-line discussion, but instead intend to present useful techniques and examples.

The recipe began by creating a separate table to hold pending approval department rows: CREATE TABLE HumanResources.DepartmentApproval (Name nvarchar(50) NOT NULL UNIQUE, GroupName nvarchar(50) NOT NULL, ModifiedDate datetime NOT NULL DEFAULT GETDATE()) Next, a view was created to display both approved and pending approval departments: CREATE VIEW HumanResources.vw_Department AS SELECT Name, GroupName, ModifiedDate, 'Approved' Status FROM HumanResources.Department UNION SELECT Name, GroupName, ModifiedDate, 'Pending Approval' Status FROM HumanResources.DepartmentApproval GO

Do not compile applications used during the system boot process with any version of Glibc other than your primary one. If you must do this for some reason, ensure that these applications are only executed after all of your partitions are mounted, or ensure that your alternate version of Glibc is installed somewhere on your system s root (/) partition, which is the first partition mounted during the boot process (aside from an initial RAM disk, if you are using one). Always keep backup copies of such applications, so that you can boot from a rescue disk and restore them if necessary. Do not do this! If you want to be able to automatically compile and link against an alternate Glibc, building a separate version of GCC that knows about the new version of Glibc is a much better idea than hacking the spec files of an existing GCC to use your new Glibc. Hacking the specification files used by an existing version of GCC is simply asking for trouble unless you are a true wizard, in which case you should not be making any other errors.

The UNION in the CREATE VIEW prevents this view from being updateable, as any inserts against it will be ambiguous. INSTEAD OF triggers allow you to enable data modifications against non-updateable views. A trigger was created to react to INSERTs, routing them to the approval table so long as the department name was unique: CREATE TRIGGER HumanResources.trg_vw_Department ON HumanResources.vw_Department INSTEAD OF INSERT AS SET NOCOUNT ON INSERT HumanResources.DepartmentApproval (Name, GroupName) SELECT i.Name, i.GroupName FROM inserted i WHERE i.Name NOT IN (SELECT Name FROM HumanResources.DepartmentApproval) A new INSERT was tested against the view, to see if it would be inserted in the approval table: INSERT HumanResources.vw_Department (Name, GroupName) VALUES ('Print Production', 'Manufacturing') The view was then queried, showing that the row was inserted, and displayed a pending approval status.

In this recipe, I ll demonstrate the use of DML triggers and their interactions with transactions both within the trigger and within the initiating event that caused the trigger to fire. For these examples, we ll be working with the objects created in the Creating an AFTER DML Trigger recipe. When a trigger is fired, SQL Server always creates a transaction around it, allowing any changes made by the firing trigger, or the caller, to roll back to the previous state. For example, the trg_uid_ ProductInventoryAudit trigger has been rewritten to fail if certain Shelf or Quantity values are encountered. If they are, ROLLBACK is used to cancel the trigger and undo any changes: CREATE TRIGGER Production.trg_uid_ProductInventoryAudit ON Production.ProductInventory AFTER INSERT, DELETE AS SET NOCOUNT ON IF EXISTS (SELECT Shelf FROM inserted WHERE Shelf = 'A') BEGIN PRINT 'Shelf ''A'' is closed for new inventory.' ROLLBACK END -- Inserted rows INSERT Production.ProductInventoryAudit (ProductID, LocationID, Shelf, Bin, Quantity,

Accidentally compiling critical applications using an alternate version of Glibc and then removing it. Modifying the library specification files used by GCC to automatically use an alternate version of Glibc and then removing the alternate version of Glibc.