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When you mapped a bidirectional one-to-many association in section 3.6, we explained why one end of the association must be mapped with inverse="true". Feel free to review that section, because it s relevant for bidirectional many-to-many associations too. In particular, each row of the link table is represented by two collection elements: one element at each end of the association. For example, you may create an Item class with a collection of Category instances, and a Category class with a collection of Item instances. When it comes to creating relationships in .NET code, it may look something like this:

import org.aspectj.lang.*; import logging.*; public aspect TraceAspectV4 extends IndentedLogging {

example I ll include in this chapter. In many cases, developers don t have this available to them, or don t have the knowledge required to set up an existing one, or perhaps are further constrained by other business or environmental factors. The presentation model approach is also good for combining data from multiple sources. You can create a single entity that s composed of fields from multiple databases. In all of these cases, the presentation model approach can be a huge help. In this section, you ll take the employee service and model you ve been working with and convert (more correctly, rewrite) it to introduce a presentation model. I ll show you how to query data, update data, and insert data using this new model.

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The URL here will be used to point to the RSS feed we re caching. The List is our cache. Now to implement our business methods:

2. 3. 4.

Before .NET, Windows programmers depended on the GDI system to draw pretty much anything on the screen, even if they didn t know that GDI existed. In addition to bitmap images, all controls, labels, window borders, and icons appeared on the screen thanks to GDI. It was a giant step forward from character graphics. GDI presented a basic set of drawing features from which you could potentially output any type of complex image. But it wasn t easy. The graphics primitives were well primitive, and you had to build up complex systems from the parts. Most programmers weren t into making things beautiful, so they tried to avoid the complexities of GDI. But sometimes you had to draw a line or a circle, and there was no way around it. GDI+, new with .NET, builds on GDI, providing the basic primitives of GDI, but also supplying some more complex groupings of graphics features into easy-to-use functions. This simplicity has brought about a renaissance of programmer-initiated graphics work. Take a look at Figure 18-1, which shows an image that was drawn using the older GDI, and that same image generated with just a few quick commands in GDI+.

VB.NET has no instruction equivalent to yield return. Without this shortcut, VB.NET developers have to implement the IEnumerable(Of T)

Figure 14.23 An alert definition for level 17 errors. Error levels 16 thru 25 should have individual alerts created.

In previous versions of the Entity Framework, foreign key columns represented with navigation properties would not get scalar properties providing direct access to the key values there would have been no CustomerID property on the SalesOrderHeader type, for example. This proved awkward in practice, so starting with .NET 4 relationships are represented both as the underlying foreign key value and also as a navigation property.

As we ll be representing the RSS entries in some generic form, first we should define what information we ll expose to the client:

/* fib1.c */ #include <stdio.h> long Fibonacci(long n) { printf("%ld", n); if (n == 0) return 0; if ( (n == 1) || (n == 2) ) return 1; return Fibonacci(n-1) + Fibonacci(n-2); }

@Entity public class User { private Long userId; private String email; private BillingInfo billing; One-to-one relationship ... using properties @OneToOne public BillingInfo getBilling() { this.billing; } public void setBilling(BillingInfo billing) { this.billing = billing; } } @Entity public class BillingInfo { private Long billingId; private String creditCardType; ... }

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