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// 1. A PRIVATE delegate field that is initialized to null private EventHandler<NewMailEventArgs> NewMail = null; // 2. A PUBLIC add_Xxx method (where Xxx is the Event name) // Allows methods to register interest in the event. public void add_NewMail(EventHandler<NewMailEventArgs> value) { // The loop and the call to CompareExchange is all just a fancy way // of adding a delegate to the event in a thread-safe way EventHandler<NewMailEventArgs>prevHandler; EventHandler<NewMailEventArgs> newMail = this.NewMail; do { prevHandler = newMail; EventHandler<NewMailEventArgs>newHandler = (EventHandler<NewMailEventArgs>) Delegate.Combine(prevHandler, value); newMail = Interlocked.CompareExchange<EventHandler<NewMailEventArgs>>( ref this.NewMail, newHandler, prevHandler); } while (newMail != prevHandler); } // 3. A PUBLIC remove_Xxx method (where Xxx is the Event name) // Allows methods to unregister interest in the event. public void remove_NewMail(EventHandler<NewMailEventArgs> value) { // The loop and the call to CompareExchange is all just a fancy way // of removing a delegate from the event in a thread-safe way EventHandler<NewMailEventArgs> prevHandler; EventHandler<NewMailEventArgs> newMail = this.NewMail; do { prevHandler = newMail; EventHandler<NewMailEventArgs> newHandler = (EventHandler<NewMailEventArgs>) Delegate.Remove(prevHandler, value); newMail = Interlocked.CompareExchange<EventHandler<NewMailEventArgs>>( ref this.NewMail, newHandler, prevHandler); } while (newMail != prevHandler); }

Local Users And Groups, an MMC snap-in, offers more advanced capabilities than either version of User Accounts. Local Users And Groups is not available in Windows Vista Home Basic and Home Premium editions. You can start Local Users And Groups, shown in Figure 11-10, in any of the following ways:

Reliable delivery of conversation messages means that Service Broker will keep trying to deliver the message in the face of pretty much any type of failure or interruption, including the following:

declarative or programmatic, each of which provides a different level of control over the authentication process. In addition, like the transaction management features discussed in this chapter, security applies to session beans and MDBs, and not the JPA entities. We ll first explore declarative security management by coding our bid-canceling scenario presented in 6.4.3 and then move on to exploring programmatic security management.

<connectionStrings> <add name="LocalSqlServer connectionString="SERVER=127.0.0.1;INTEGRATED SECURITY=SSPI /> </connectionStrings>

The function is quite straightforward, returning a List<CityData> that is built in the function. This List<> is built by creating new instances of the aforementioned CityData class, with the name, latitude, and longitude passed in as the constructor.

Listing 8-45. Alternative Solution Without Using the MINUS Operator select DISTINCT o.location from offerings o where o.location not in (select d.location from departments d) Note that you must add a DISTINCT operator, to handle situations where you have multiple course offerings in the same location. As explained before, the MINUS operator automatically removes duplicate rows. Are the two queries in Listing 8-44 and 8-45 logically equivalent They appear to be logically the same, but they are not quite as identical logically as they first appear. The first query will return two rows. One is for Seattle. The other is a null, representing the one course offering with an unknown location. The MINUS operator does not remove the null value, whereas that same null value fails to pass the WHERE condition in Listing 8-45. This is just one more example of the subtle pitfalls inherent in dealing with nulls in your data. You can also produce outer join results by using the UNION operator. You will see how to do this in Listings 8-46 and 8-47. We start with a regular join in Listing 8-46. In Listing 8-47 you add the additional department(s) needed for the outer join with a UNION operator, while assigning the right number of employees for those departments: zero. Listing 8-46. Regular Join select , , from , where group by , DEPTNO -------10 20 30 d.deptno d.dname count(e.empno) as headcount employees e departments d e.deptno = d.deptno d.deptno d.dname; DNAME HEADCOUNT ---------- --------ACCOUNTING 3 TRAINING 5 SALES 6

In summary, the previous PIVOT query is logically equivalent to the following query: SELECT city, COUNT(CASE WHEN category = 'no_orders' THEN customerid END) AS [no_orders], COUNT(CASE WHEN category = 'upto_two_orders' THEN customerid END) AS [upto_two_orders], COUNT(CASE WHEN category = 'more_than_two_orders' THEN customerid END) AS [more_than_two_orders] FROM (SELECT C.customerid, city, CASE WHEN COUNT(orderid) = 0 THEN 'no_orders' WHEN COUNT(orderid) <= 2 THEN 'upto_two_orders' WHEN COUNT(orderid) > 2 THEN 'more_than_two_orders' END AS category FROM dbo.Customers AS C LEFT OUTER JOIN dbo.Orders AS O ON C.customerid = O.customerid GROUP BY C.customerid, city) AS D GROUP BY city;

We discussed utilizing a boost factor in section 7.1.6. Boost can also be managed programmatically in several places of the API. Listing 7.18 illustrates how Hibernate Search defines an @Boost annotation.

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