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if (fp) { wprintf(time_text); fwprintf(fp, time_text); } else { throw new native_exception; } } ~NativeClass() { printf("Closing the file.\n"); if (fp) { fclose(fp); } } }; // A reference type enclosing a Native Class ref class R { native_root<NativeClass> n; public: R() { } // Marshal the String to a Unicode string // and pass the pointer to the native class method void OutputToFile(String^ s) { IntPtr ptr = Marshal::StringToHGlobalUni(s); n->OutputText(static_cast<wchar_t*>( ptr.ToPointer())); n->TimeStamp(); Marshal::FreeHGlobal(ptr); } }; int main() { R^ r1 = gcnew R(); r1->OutputToFile("Output through native class!\n"); delete r1; // the file is closed

The answer to the second part of the question depends on your version of Oracle. If you are still running 8i, then Oracle will aggregate the view and then perform the join without considering the alternative. If you are running 9i, Oracle will open up the view, join, and then aggregate without considering the alternative. If you are running 10g, Oracle will work out the cost of both alternatives separately, and take the cheaper one. You can see this if you rerun script view_merge_01.sql, but set event 10053 (which will be discussed in later chapters) to generate a trace file of the optimizer s cost calculations.

One of the nice new features of the Clock application is the Bedside Mode setting. For those of us who keep our BlackBerry by the side of our bed, we now have the option of telling our BlackBerry not to flash, ring, or buzz in the middle of the night. We just have

As you go through the versions of Oracle, you will notice many examples of mechanisms that can be enabled or disabled at the system or session level by hidden parameters; there are also many mechanisms that can be enabled or disabled by hints at the SQL level. A common evolutionary path in the optimizer code seems to be the following: hidden by undocumented parameter and disabled in the first release; silently enabled but not costed in the second release; enabled and costed in the third release.

to activate Bedside Mode by pressing the Menu key and selecting Enter Bedside Mode. To configure the Bedside Mode Options, press the Menu key in the Clock application and scroll down to Options. Down towards the bottom of the Options menu are the specific Bedside Mode options. You can disable the LED and the radio and dim the screen when Bedside Mode is set.

R r2; r2.OutputToFile("More output\n"); // File is closed again when r2 is cleaned up. } The output of Listing 12-21 is something like the following: Opening the file. Output through native class! Tue Sep 05 23:39:57 2006 Closing the file. Opening the file. More output Tue Sep 05 23:39:57 2006 Closing the file. Notice that a static member, StringToHGlobalUni of the Marshal class, is used to convert from String to wchar_t*. This creates a new wide character array and returns a pointer to it in the form of an IntPtr, which must be freed. We can free the memory with Marshal::FreeHGlobal to say in managed code rather than calling the native API GlobalFree to free the memory. IntPtr has the ToPointer method, which returns a void pointer that we then cast to the desired type for the managed function call.