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14 rows selected. SQL> 4. For all course offerings, list the course code, begin date, and number of registrations. Sort your results on the number of registrations, from high to low. Solution 8-4. SQL> 2 3 4 5 6 7 8 9 10 select , , from course begindate count(r.attendee) as reg_count offerings o left outer join registrations r using (course, begindate) group by course , begindate order by reg_count desc;
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A More Complicated Custom Control Our simple CenteredLabel custom control example was a good starting place for learning about custom controls. However, it doesn t even begin to touch on what you can achieve using custom controls. In the next example, we ll create a more complicated custom control to handle a more common scenario. Whenever you re laying out a Web Form, you ll almost certainly want to lay out text boxes with labels that describe the required entry. A great number of variables are inherent within this situation. Should the text box be to the right of the label or below the label on the next line Does the text box have default text What about the style of the label and the text box Just as with the CenteredLabel custom control, the first and most important decision here is to determine what class to inherit from. Because C# and Visual Basic .NET offer only single inheritance, you ll have to select a single class. In this example, we have two possible alternatives: the label or the text box. Presented with such a choice, we should look at exactly what it is we re trying to create. Is it a label with a text box, or a text box with a label Pretty clearly, what we want is a text box with a label. Looking at it another way, this control is a text box, and it has a label. This example is greatly oversimplified, but you ll still have to decide which single class to inherit from, no matter how complicated your control. Note You do have another alternative for creating a custom control such as this label/text box example: composite controls. We ll discuss composite controls in the next section. This more complicated custom control is named LabelTextBox. Listing 6-6 shows LabelTextBox.vb, which declares and implements the LabelTextBox class. Listing 6-6 LabelTextBox custom control in Visual Basic .NET used to create a label and a text box
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Figure 10-5
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A WMI Filter query that looks for Windows XP, Service Pack2.
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Document flags to the bit level If a variable is used as a bit field, document the meaning of each bit, as in the next example.
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As the JIT compiler produces the native code, it also creates an internal table . Logically, each entry in the table indicates a range of byte offsets in the method s native CPU instructions, and for each range, a set of memory addresses and CPU registers that contain roots . For the WriteBytes method, this table reflects that the EBX register starts being a root at offset 0x00000003, the ESI register starts being a root at offset 0x00000005, and the ECX register starts being a root at offset 0x0000000f . All three of these registers stop being roots at the end of the loop (offset 0x00000028) . Also note that the EAX register is a root from 0x0000001c to 0x0000001e . The EDI register is used to hold the Int32 value represented by the variable x in the original source code . Since Int32 is a value type, the JIT compiler doesn t consider the EDI register to be a root . The WriteBytes method is a fairly simple method, and all of the variables that it uses can be enregistered . A more complex method could use all of the available CPU registers, and some roots would be in memory locations relative to the method s stack frame . Also note that on an x86 architecture, the CLR passes the first two arguments to a method via the ECX and EDX registers . For instance methods, the first argument is the this pointer, which is always passed in the ECX register . For the WriteBytes method, this is how I know that the this pointer is passed in the ECX register and stored in the EBX register right after the method prolog . This is also how I know that the bytes argument is passed in the EDX register and stored in the ESI register after the prolog . If a garbage collection were to start while code was executing at offset 0x00000017 in the WriteBytes method, the garbage collector would know that the objects referred to by the EBX (this argument), ESI (bytes argument), and ECX (the m_textWriter field) registers were all roots and refer to objects in the heap that shouldn t be considered garbage . In addition, the garbage collector can walk up the thread s call stack and determine the roots for all of the calling methods by examining each method s internal table . The garbage collector iterates through all the type objects to obtain the set of roots stored in static fields . When a garbage collection starts, it assumes that all objects in the heap are garbage . In other words, it is assumed that the thread s stack contains no variables that refer to objects in the heap, that no CPU registers refer to objects in the heap, and that no static fields refer to objects in the heap . The garbage collector starts what is called the marking phase of the collection . This is when the collector walks up the thread s stack checking all of the roots . If a root is found to refer to an object, a bit will be turned on in the object s sync block index field this is how the object is marked . For example, the garbage collector might locate a local variable that points to an object in the heap . Figure 21-3 shows a heap containing several allocated objects, and the application s roots refer directly to objects A, C, D, and F . All of these objects are marked . When marking object D, the garbage collector notices that this object contains a field that refers to object H, causing object H to be marked as well . The garbage collector continues to walk through all reachable objects recursively .
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If all the packets you send come back properly in roughly the same time, your TCP/IP connection is fine and you can focus your troubleshooting efforts elsewhere. If some packets time out, a Request timed out message appears, indicating that your network connection is working, but that one or more hops between your computer and the target machine are experiencing problems. In that case, repeat the Ping test using the n switch to send a larger number of packets; ping n 30 192.168.1.1, for example, sends 30 packets to the computer or router at 192.168.1.1.
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The benefit of refusing permissions is to reduce the likelihood of code being subverted into performing tasks that the programmer didn't intend. Consider the following example, which prints the contents of a URL to the console:
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The motivation for calculating the two aggregates in a single derived table instead of as two separate subqueries stemmed from the fact that each subquery accessed the base table separately, while the derived table calculated the aggregates using a single scan of the data. SQL Server s query optimizer didn t use the fact that the two subqueries aggregated the same data into the same groups. When you specify multiple aggregates with identical OVER clauses in the same SELECT list, however, the aggregates refer to the same window, as with a derived table, and SQL Server s query optimizer evaluates them all with one scan of the source data. Here s how you use the OVER clause to answer the same request:
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With the scope limited to the application s /MyApplication path, the browser submits the cookie to any page in the /MyApplication folder. Pages outside of this folder do not get the cookie, even if they are on the same server.
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Volatile constructs, which perform an atomic read or write operation on a variable containing a simple data type Interlocked constructs, which perform an atomic read and write operation on a variable containing a simple data type
Customizing the Detailed Report
bindUI: function() { this._viewHeader.click(function() { //console.log('Clicked on Header'); }); }, syncUI: function() { this._viewHeader.CSS('color', 'red'); },
In this chapter we ve covered the essentials of object orientation and the features Ruby provides to make object-oriented code a reality. You ve looked at the concepts that apply to object orientation in most languages, such as inheritance, encapsulation, class methods, instance methods, and the types of variables that you can use. Lastly, you developed a basic set of classes to produce a simple dungeon. Let s reflect on some of the concepts we covered in this chapter: Classes: A class is a collection of methods and data that are used as a blueprint to create multiple objects relating to that class. Objects: An object is a single instance of a class. An object of class Person is a single person. An object of class Dog is a single dog. If you think of objects as real-life objects, a class is the classification, whereas an object is the actual object or thing itself. Local variable: A variable that can only be accessed and used from the current scope. Instance/object variable: A variable that can be accessed and used from the scope of a single object. An object s methods can all access that object s object variables. Global variable: A variable that can be accessed and used from anywhere within the current program.
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Installing and Configuring a Network Adapter
return ( _T ( "EXCEPTION_FLT_INEXACT_RESULT" ) ) ;
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BackgroundThread. Use this setting to asynchronously receive the event on a .NET
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