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int main() { Events^ events = gcnew Events(); // Add the event handlers for Start and Exit events->Start += gcnew EventHandler(events, &Events::OnStart); events->Exit += gcnew EventHandler(events, &Events::OnExit); f(events); // Remove the event handlers events->Start -= gcnew EventHandler(events, &Events::OnStart); events->Exit -= gcnew EventHandler(events, &Events::OnExit); } This code works because, as for a trivial property, methods are automatically generated by the compiler for adding and removing event handlers and raising events In addition, an underlying delegate is created You can certainly go far with events simply using trivial events, since often the add, remove, and raise methods are just what you need However, if your application requires special handling for adding or removing event handlers, or raising events, you can go beyond these default methods and define your own Listing 7-17 rewrites this to define custom add, remove, and raise methods.

The optimizer has very cleverly noticed that the distinct was redundant: according to the execution plan, the result set from the in-line view in line 2 has not been sorted. And here s the 10g version of the plan again with CPU costing enabled: ------------------------------------------------------------------------------| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------| 0 | CREATE TABLE STATEMENT | | 2000 | 56000 | 20 (15)| 00:00:01 | | 1 | LOAD AS SELECT | | | | | | | 2 | SORT UNIQUE | | 2000 | 56000 | 18 (17)| 00:00:01 | | 3 | VIEW | | 2000 | 56000 | 17 (12)| 00:00:01 | | 4 | INTERSECTION | | | | | | | 5 | SORT UNIQUE | | 2500 | 32500 | 7 (15)| 00:00:01 | | 6 | TABLE ACCESS FULL| T1 | 2500 | 32500 | 6 (0)| 00:00:01 | | 7 | SORT UNIQUE | | 2000 | 26000 | 7 (15)| 00:00:01 | | 8 | TABLE ACCESS FULL| T2 | 2000 | 26000 | 6 (0)| 00:00:01 | ------------------------------------------------------------------------------Notice the sort unique at line 2 It looks like 10g has reintroduced the redundant sort that 9i was smart enough to eliminate. Fortunately, we can always check up on the sorting that actually happens by enabling event 10032 and guess what the 9i execution plan is lying. The 10032 trace files from both 9i and 10g show the same characteristic pattern. And I ve printed an extract of the 10g trace here: Input records Output records Input records Output records Input records Output records Input records Output records Input records Output records Input records Output records 2000 9 2500 10 9 9 9 9 2500 10 2000 9 -- T1

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In this case, we use the custom methods to track what s going on by writing to the console If you do write your own add and remove accessors, you should take care to ensure thread safety The default add and remove accessors lock on the containing object (the this pointer), meaning that any other thread attempting to access these methods on the same object will be locked out You can use the lock template provided in the msclr namespace (#include msclr\lockh to access it) to accomplish this Locking the add and remove accessors will prevent corruption of the list that keeps track of the functions to be called when an event is fired Locking the raise method is not a good idea since the code you call from your event handler might lead to an invocation of the event, which will lead to a deadlock Listing 7-17.

The optional from...let...where section is the first section of the query body. It can have any number of any of the three clauses that comprise it the from clause, the let clause, and the where clause. Figure 21-8 summarizes the syntax of the three clauses.

Customizing add, remove, and raise // events_customcpp #include <msclr\lockh> using namespace System; using namespace msclr; ref class Events { public: // underlying delegates to use for the events EventHandler^ _start, ^ _exit;.

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