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Now that you ve defined all this metadata for a type, you ll want to access it programmatically. Getting attributes on an object is an example of the use of reflection, a .NET Framework feature that recalls the runtime type information (RTTI) feature in classic C++. Reflection enables you to query the attributes of an object at runtime, as well as other metadata associated with a type, such as the type name, inheritance relationships, properties, methods, and events of a type. Not only can you query for information, but you can also create new types, instantiate objects, and call methods on these objects from dynamically loaded assemblies, even if the type or method name is known only from reflection. Reflection does not work with mixed mode (compiled with /clr) executables; you must compile with /clr:pure or /clr:safe in order to use reflection on an assembly. This is because reflection only knows how to load MSIL; it has no knowledge of non-MSIL code that is present in mixed mode. The Assembly::LoadFrom method we used in 9 is a good way to get started with reflection. Once we ve loaded an assembly, we can get the types in the assembly as a collection of Type objects using the GetTypes method on the assembly class, as in Listing 10-16.

You can also adjust the Video Format option to select for Normal video storage or MMS Mode. NOTE: MMS mode uses a much smaller screen and file size that is suitable for sending wirelessly; however, it will be of lower quality than Normal mode. To choose where your videos are stored, click the Folder icon and navigate to a new folder. Remember, we strongly recommend storing your videos on a media card. This way, you don t fill up your main BlackBerry device memory.

These don t often appear as the default path in 8i, but when you upgrade to 9i and enable CPU costing, they may appear more often because tablescans become more expensive. The index hash join (or just index join) works by combining the contents of two (or more) indexes on a table to avoid visiting the table. Unlike the older and_equal path, the indexes don t have to be single column, and the predicates don t have to be equalities. To date, I haven t seen an example where the index join caused a performance problem.

Your BlackBerry supports many different video formats. The following tables list the video formats supported by the BlackBerry 8500 series in particular. Supported Formats (Source: www.blackberry.com) File Format / Component Codec Extension

The optimizer automatically converts an in-list into a set of predicates separated by the or operator. The sample code shows the before and after versions of such a conversion: where where or or colx in (1,8,32) colx = 1 colx = 8 colX = 32

Listing 10-16 Loading an Assembly and Reflecting on Types Assembly^ assembly = Assembly::LoadFrom("myassemblydll"); array<Type^>^ types = assembly->GetTypes(); for each (Type^ t in types) { Console::WriteLine(t->ToString()); } The Type object is a gateway to all the information about the type, including the methods, method parameters, properties, constructors and so on Throughout this book, you ve seen multiple ways to get Type objects If the type is accessible at compile time, you can get a type object by specifying ::typeid on a managed type ::typeid is a compiler-defined way of getting the Type object Type^ t = String::typeid; // Get the static type For a type that is known only from an object, you can use the GetType method inherited from Object, so it s available on all managed types The difference between GetType and typeid is that GetType returns the dynamic type, whereas typeid evaluates to the static type.

Simple and Advance Simple Profile, 320x240 pixels, up Supported to 1500 kbps, 24 frames per second Profile 0 and 3, Level 45 Supported

The standard formula that the optimizer uses for calculating the selectivity of predicates combined with or is not appropriate to an or expansion of an in-list, as the formula includes a factor (catering to double-counting) that is irrelevant in this special case.

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However, the optimizer used this standard formula to handle in-lists all the way through 8i, and only introduced a corrected formula for in-lists in 9i. This means that the selectivity of an in-list goes up in 9i. The most visible side effect of this is that an in-list iterator that originally used an index may switch to using a tablescan. Alternatively, the change in selectivity may even result in a change in the join order. The change of formula has not yet (as far as 10.1.0.4) been applied to the not in clause.