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In C#, the preferred model for event firing is based on untyped-object calls Special constructs were added to the language to make the process simple The delegate keyword supports the definition of a reference-to-method type For example, to declare a reference to a universal method (which takes no parameters and returns no values), you would declare a delegate like this: delegate void UniversalMethod(); The word UniversalMethod is an arbitrarily chosen name for the new reference-to-universalmethod type The simplest Fire method for an untyped method call for an event named X would look something like the one shown in Listing 8-23 Listing 8-23 The C# Fire Method for Event X, Using Delegates public delegate void UniversalMethod(); public UniversalMethod OnX; void FireX() { if (OnX != null) OnX(); } The example uses a delegate variable called OnX to store a list of subscribers and invoke them.

In this chapter, you ll explore in detail how to invoke stored SQL procedures from JDBC using the CallableStatement interface. You ll learn how to use SQL92 syntax or Oracle syntax when invoking a stored procedure using the CallableStatement interface.

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Assume the variable OnX is part of an object named myObject, of type MyClass A subscriber containing a universal method called DoSomething might be subscribed to myObject using this notation: myObjectOnX = new MyClassUniversalMethod(DoSomething); The code instantiates a new UniversalMethod variable, pointing at the subscriber s DoSomething method The variable is then assigned to myObjectOnX, using a plain assignment operator While the assignment operator can be used to register subscriptions, it is rarely used in the context of events Why The reason is simple C# delegates support multicasting, and the assignment operator does exactly what you would expect: It assigns a value to a delegate variable In doing so, it wipes out any other references being held by the delegate To avoid this problem, subscribers must subscribe using the += operator, to add a subscription to those already present.

You may be able to use the pivot table s Show Details feature to re-create the source data: 1. Ensure that none of the items in the visible fields are hidden. Each report filter field should have (All) selected, and the (Select All) item should be checked in each of the row and column fields. To clear all the filters, on the Ribbon s Options tab, in the Actions group, click Clear, and then click Clear Filters.

This chapter describes the advanced features of the ResultSet interface, including prefetching, scrollability, positioning, sensitivity, and updatability. You ll learn the various strengths and weaknesses of these features, and you ll examine how to paginate through the results of a query efficiently. You ll learn how you can dynamically build query statements with unknown number of bind variables using either the PreparedStatement or CallableStatement interface. The ResultSetMetaData and DatabaseMetaData interfaces are also covered.

To hide the assignment operator from subscribers, C# allows access to delegate variables to be restricted through the use of special event properties, which support only the += and -= operators on the underlying delegate, allowing a subscriber to add or remove itself without disturbing previous subscriptions A m nage-a-trois pattern emerges here: For every C# event, there is a delegate type, an event property, and a Fire method The delegate defines the signature of the method to call The (Fire, delegate, event) triad for event X is shown in Listing 8-24..

This chapter introduces Oracle objects and collections. You ll critically examine how these features should be used in Oracle applications in general. Note that this chapter doesn t discuss how to access objects and collections from JDBC; those topics are covered in the next three chapters. I strongly recommend you read this chapter, though, since it forms the basis of the following three chapters that discuss Oracle objects and collections.

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