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parsed and validated at compile time, whereas HQL expressions aren t parsed until runtime (or startup, if externalized named queries are used). The nice thing about the Hibernate Criteria API is the Criterion framework. This framework allows extension by the user, which is more difficult in the case of a query language like HQL. Note that the Criteria API is native to Hibernate; it isn t part of the Java Persistence standard. In practice, Criteria will be the most common Hibernate extension you utilize in your JPA application. We expect that a future version of the JPA or EJB standard will include a similar programmatic query interface. Querying by example As part of the Criteria facility, Hibernate supports query by example (QBE). The idea behind query by example is that the application supplies an instance of the queried class, with certain property values set (to nondefault values). The query returns all persistent instances with matching property values. Query by example isn t a particularly powerful approach. However, it can be convenient for some applications, especially if it s used in combination with Criteria:

The output looks like this:

Note The names of generic interfaces do not clash with non-generic interfaces. For example, in the preceding code, we could have also declared a non-generic interface named IMyIfc.

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Creating unit tests with MSTest is as easy as it is with NUnit. You can turn on test coverage for MSTest, too. To do so, you have to open the Local.testsettings file in Visual Studio (it s with the solution items); see figure 6.12. After enabling the test coverage, you have to decide what assemblies should be instrumented. You can do this by clicking the Configure button shown in figure 6.12. If for some reason you decide to strongly sign the assembly that contains the tests, you must enable re-signing. To do so, choose the re-signing key at the bottom of the configuration window. We encourage you to further explore MSTest. One good resource is the Microsoft Press book Software Testing with Visual Studio 2010. But right now, let s see how to add the MSTest test to your continuous build process on Team Foundation Server (TFS) 2010.

The inheritance mappings we described so far in this chapter concerned a class hierarchy of entity beans. Sometimes, however, you need to inherit from a nonentity superclass. This superclass may be an existing class in your domain model that you do not want to make an entity. The @javax.persistence.MappedSuperclass annotation allows you to define this kind of mapping. Let s modify our example class hierarchy and change Person into a mapped superclass:

WHERE c.categoryName LIKE 'Recycle%'

Figure 4.19 Visual Studio Solution runner configuration. It starts the Rebuild target in the Release configuration.

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In listing 10.16, we define two variables to hold strings that are used to insert a CSS class around the portion of text that matches the string. This allows us to style the text easily. The first variable, undeStart, holds our start span tag, while the second variable, undeEnd, holds the closing span tag.

Listing 4-22. Passing by Reference // passing_reference.cpp void increment(int& i) { i++; } If you wanted to pass a pointer by reference in classic C++, you would use *&, a reference to a pointer. void modify_pointer(CClass*& ptr); These constructs have equivalents in the C++/CLI managed world. The handle symbol in the parameter list is used for objects passed by reference. void g(R^ r); This is the normal way of passing reference types. This default makes sense for several reasons. First, passing by value is expensive for larger objects. Primitive types and value types are generally small, and the overhead of passing by value is not large, so value types are usually passed by value, like this: void f(V v); Figure 4-3 shows the typical case of value types and reference types being passed to functions. Because the local data is freed up when the function exists, any changes to the local data, either the local value type or the local handle, are not reflected outside the function. A copy is created of a value type passed to a function, in this case declared as f(V v_local), and a value passed in with the expression f(v). Figure 4-3 also shows a reference type that was passed to a function declared as g(R^ r_local) and a handle passed in with the expression g(r). The local handle in g refers to the same object on the managed heap.

Picture this situation: we ve finished developing our portal application, so we deploy the application files onto the company s servers and release it to the users in the HR department For the first week everything goes according to plan and, aside from a few requests for enhanced functionality, there have been no major hiccups and the application is running smoothly However, in the second week, we start getting phone calls from the users complaining that, at times, our application seems to run slowly and sometimes stops working altogether This is the worrisome scenario we face every time we deploy our applications into a production environment.

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