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Solution to Question 17-1. The purpose of a delegate is to decouple the method(s) called from the calling code. It allows the designer of an object to define the delegate, and the user of the object to define which method will be called when the delegate is invoked. Solution to Question 17-2. Delegates are reference types, but instead of referring to an object, they refer to a method. Solution to Question 17-3. You instantiate a previously defined delegate named OnPhoneRings like this:

Parts : RELATION p id : name, size, weight, etc Possible supplier : RELATION s id, p id : ;

OnPhoneRings myDelegate = new OnPhoneRings(myMethod);

Two possible query fragments to Locate Source of Heavy Parts are:

Solution to Question 17-4. The following is the standard way to define a delegate for an event handler:

GET Partsweight, Supplieraddress GET Partsweight, Supplieraddress The two paths will lead to di erent result tuples

h(sal)=11

public delegate void PhoneRangHandler ( object sender, EventArgs e );

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A number of alternative techniques to retrieve data from a database are feasible We list them in order of increased sophistication 1 No path selection is attempted, and the user will move explicitly from one relation to the next, generally using the familiar and de ned connections 2 A database submodel is prede ned to provide the desired view for the user, and that submodel selects one connection, determining the path 3 All possible pathways are computed and presented to the user for selection 4 Rules for selecting the best from the set of all possible pathways are applied by the system An implementation often does not de ne all the known connections, so that implemented networks are often simpler than the database model indicated The dual problem also exists in networks, when one data item may be found by more than one name The two queries below, using a di erent path, will locate the same data item

You then use the event keyword to restrict the delegate such that it can be invoked only by the defining class:

Alternate names for the same item can lead to problems in integrity protection This issue is addressed in Chap 13

public event PhoneRangHandler PhoneHasRung;

9-1-3 Self-Contained versus Host Language Services The obvious role of a database-management system is retrieval from and update of the database In the implementation of a complete system it is also necessary to support analysis capability on the retrieved data There are two basic approaches to the incorporation of analysis capability into database systems, as illustrated in Fig 9-2, namely, self-contained and host-based

Solution to Question 17-5. Here is how to call a delegated method:

Self-Contained Systems The database system provides all the required services There has to be at least some capability to execute computations on data retrieved from the database system The RETRIEVE system (Figs 8-5, 8-6, 8-7) and SOCRATE (Fig 8-10) provided examples of self-contained systems

h(age)=10

PhoneHasRung(this, new EventArgs( ));

The database system carries out the retrieval and update functions only, and delivers the data on request to programs written in a host system language The IDS system (Fig 8-12) and the DBTG speci cations (Fig 8-9) shown in Chap 8 provide examples of the host-based approach

Solution to Question 17-6. The event keyword limits the use of the delegate in the following ways: You can only add a method using +=. You can only remove a method using -=. The delegate can be invoked only by the class that defines it. Solution to Question 17-7. To pass information to the method called through the event, define the delegate to take as its second parameter an object of a type derived from EventArgs. Pass the information through properties of that object. Solution to Question 17-8. System.EventArgs has no methods or properties other than those it inherits from Object, and a public, static field named Empty. The point of System.EventArgs is that it allows you to derive a class that contains whatever properties you need to pass to the event handlers.

Sec 9-1

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Solution to Question 17-9. Rather than creating a method that matches the delegate s signature and then assigning the name of that method to the delegate, anonymous methods allow you to directly assign an unnamed delegate method by providing the implementation in line with the assignment. Solution to Question 17-10. A lambda expression doesn t return a type, but rather a reference to a method. Lambda expressions are similar to anonymous methods, but they have applications outside of event handlers.

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