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Inside Microsoft SQL Server 2008: T-SQL Programming
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There's another way to figure out which rows participate in the median calculation based on the row number and the count of rows in the group: rn IN((cnt+1)/2, (cnt+2)/2). For an odd number of elements, both expressions yield the middle row number. For example, if you have 7 rows, both (7+1)/2 and (7+2)/2 equal 4. For an even number of elements, the first expression yields the row number just before the middle point and the second yields the row number just after it. If you have 8 rows, (8+1)/2 yields 4 and (8+2)/2 yields 5. Here's the query that implements this logic: WITH RN AS ( SELECT groupid, val, ROW_NUMBER() OVER(PARTITION BY groupid ORDER BY val) AS rn, COUNT(*) OVER(PARTITION BY groupid) AS cnt FROM dbo.Groups ) SELECT groupid, AVG(1.*val) AS median FROM RN WHERE rn IN((cnt+1)/2, (cnt+2)/2) GROUP BY groupid;
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At this point, Object-B can be garbage collected if no other roots are keeping it alive . When Object-A wants to call Object-B s method, it would query GCHandle s read-only Target property . If this property returns a non-null value, then Object-B is still alive . Object-A s code would then cast the returned reference to Object-B s type and call the method . If the Target property returns null, then Object-B has been collected and Object-A would not attempt to call the method . At this point, Object-A s code would probably also call GCHandle s Free method to relinquish the GCHandle instance . Since working with the GCHandle type can be a bit cumbersome and because it requires elevated security to keep or pin an object in memory, the System namespace includes a WeakReference class to help you . This class is really just an object-oriented wrapper around a GCHandle instance: logically, its constructor calls GCHandle s Alloc, its Target property calls GCHandle s Target property, and its Finalize method calls GCHandle s Free method . In addition, no special permissions are required for code to use the WeakReference class because the class supports only weak references; it doesn t support the behavior provided by GCHandle instances allocated with a GCHandleType of Normal or Pinned . The downside of the WeakReference class is that its object must be allocated on the heap . So the WeakReference class is a heavier-weight object than a GCHandle instance . Also, the WeakReference class doesn t implement the dispose pattern (which is a bug), so there is no way for you to free the GCHandle table entry explicitly; you have to wait for a garbage collection to kick in so that its Finalize method is called . The WeakReference class was introduced in version 1 .0 of the .NET Framework; therefore, it is not generic (generics were introduced in version 2 .0) . So, I have created a little, lightweight structure that I sometimes use to put a compile-time type-safe wrapper around the WeakReference class:
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You can think of IPSec policies as a collection of packet filters that enforce security policy on IP traffic. Each filter describes some network protocol action. If traffic leaving or arriving at the device (a computer or other IP network device) on which the policy is active matches one of the filters, the traffic is either blocked, allowed, or, before it can proceed, an IPSec connection is negotiated between the sending and receiving devices. Filters can be the receipt or initialization of a specific protocol, a connection request from or to a specific device, or another action that can be determined by protocol, port, IP address, or range. These filters are defined in the IPSec policy in a rule. Example fil ters might include the following:
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data coherency, you can write a function that verifies the data and then call it when you need it most when your application is stopped in the debugger. Let me give you two examples of places I've written methods that I called only from the Watch window. The first example is when I had a data structure that was expandable in the Watch window, but to see all of it I would have been expanding the little pluses all the way past the Canadian border and up into the North Pole area. By having the debugger-only method, I could more easily see the complete data structure. The second example was when I inherited some code that (don't laugh) had nodes that were shared between a linked list and a binary tree. The code was fragile, and I had to be doubly sure I didn't screw up anything. By having the debugger-only method, I was in essence able to have an assertion function I could use at will. What's interesting in managed applications is that any time you view an object property in the Watch window, the getter accessor is called. You can easily verify this by putting the following property in a class, starting to debug, switching to the This/Me window, and expanding the this/Me value for the object. You'll see that the name returned is the name of the AppDomain the property is part of. Public ReadOnly Property WhereAmICalled() As String Get Return AppDomain.CurrentDomain.FriendlyName End Get End Property Of course, if you have an object property that copies a 3-gigabyte database, the automatic property evaluation could be a problem. Fortunately, Visual Studio .NET allows you to turn off the property evaluation in the Options dialog box, Debugging folder, General property page, Allow Property Evaluation In Variables Windows check box. What's even better is that you can turn this property evaluation on and off on the fly and the debugger immediately responds to the change. You can instantly tell when property evaluation is disabled because the Watch window family says this in the Value field: "Function evaluation is disabled in debugger windows. Check your settings in Tools.Options.Debugging.General." Native code is a bit different in that you have to tell the Watch window to call the method. Please note that I'm using the generic term "method" here. In actuality, for native code, you can reliably call only C functions or static C++ methods. As regular native C++ methods need the this pointer, which you might or might not have depending on the context. Managed methods are a little more this pointer friendly. If you're stopped in the class that contains the method to call, the Watch window automatically assumes the active this pointer is the one to use. As you've seen, calling managed code properties is trivial. Calling methods in managed or native code is just like calling them from your code. If the method doesn't take any parameters, simply type the method name and add the open and close parameters. For example, if your debugging method is MyDataCheck ( ), you'd call it in the Watch window with MyDataCheck ( ). If your debugging method takes parameters, just pass them as if you're calling the function normally. If your debugging method returns a value, the Value column in the Watch window displays the return value. A common problem when calling native functions from the Watch window is ensuring that they are valid. To check a function, type the function name into the Watch window and don't add any quotes or parameters. The Watch window will report the type and address of the function in the Value column if it can be found. Additionally, if you'd like to specify advanced 206
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As an example, run the following code to produce an XML showplan for a query in a controlled environment:
You can find similarities between this solution and the preSQL Server 2005 set-based solution I showed in the previous chapter using subqueries. The join condition here contains the same logical expression I used in a subquery before. After applying the first two phases in query logical processing (Cartesian product and ON filter), each order from O1 is matched with all orders from O2 that have a smaller or equal OrderID. This means that a row from O1 with a target row number n will be matched with n rows from O2. Each row from O1 will be duplicated in the result of the join n times. If this is confusing, bear with me as I try to demonstrate this logic with an example. Say you have orders with the following IDs (in order): x, y, and z. The result of the join would be the following: x, x y, x y, y z, x z, y z, z
In 3, you learned how to set a control s position within a Canvas panel by using attached properties. An attached property is a property that is attached to parent control. In the 3 s example, you specified the Button control s position within the Canvas object by setting two attached properties: Canvas.Top and Canvas.Left. These two properties reference the Button control s parent, which is the Canvas. <Canvas> <Button Width="100" Content="Click Me!" Canvas.Top="10" Canvas.Left="13" /> </Canvas>
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