c# datamatrix Instance Fields vs. Local Variables in C#

Access Data Matrix 2d barcode in C# Instance Fields vs. Local Variables

Displaying the High Scores in the Table View
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Note The code for this example is in the Exercise 3-1 bundle from the code download.
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C H A P T E R 21
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Table 12-3 demonstrates the techniques you would use to add (or subtract, of course) N units of time to a date. Table 12-3. Adding Time to a Date
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When you re creating an application, it s important to start with a logical architecture that clarifies the roles of all components, separates functionality so that a team can work together effectively, and simplifies overall maintenance of the system. The logical architecture must also include enough layers so that you have flexibility in choosing a physical architecture later. Traditionally, you would devise at least a 3-layer logical model that separates the interface, the business logic, and the data-management portions of the application. Today that s rarely sufficient, because the interface layer is often physically split into two parts (browser and web server), and the logic layer is often physically split between a client or web server and an application server. Additionally, various application models have been used to break the traditional Business layer into multiple parts model-view-controller (MVC) and facade-data-logic being two of the most popular at the moment. This means that the logical layers are governed by the following rules: The logical architecture includes layers in order to organize components into discrete roles. The logical architecture must have at least as many layers as the anticipated physical deployment will have tiers. Following these rules, most modern applications have four to six logical layers. As you ll see, the architecture used in this book includes five logical layers.
4 rows created. ops$tkyte%ORA11GR2> commit; Commit complete. That code recreates the DEPT table, but with an additional LAST_MOD column that uses the TIMESTAMP WITH TIME ZONE datatype (available in Oracle9i and above). We have defined this column to be NOT NULL so that it must be populated, and its default value is the current system time. This TIMESTAMP datatype has the highest precision available in Oracle, typically going down to the microsecond (millionth of a second). For an application that involves user think time, this level of precision on the TIMESTAMP is more than sufficient, as it is highly unlikely that the process of the database retrieving a row and a human looking at it, modifying it, and issuing the update back to the database could take place within a fraction of a second. The odds of two people reading and modifying the same row in the same fraction of a second are very small indeed. Next, we need a way of maintaining this value. We have two choices: either the application can maintain the LAST_MOD column by setting its value to SYSTIMESTAMP when it updates a record, or a trigger/stored procedure can maintain it. Having the application maintain LAST_MOD is definitely more performant than a trigger-based approach, since a trigger will add additional processing on top of that already done by Oracle. However, this does mean that you are relying on all of the applications to maintain LAST_MOD consistently in all places that they modify this table. So, if each application is responsible for maintaining this field, it needs to consistently verify that the LAST_MOD column was not changed and set the LAST_MOD column to the current SYSTIMESTAMP. For example, if an application queries the row where DEPTNO=10:( ) ops$tkyte%ORA11GR2> variable deptno number ops$tkyte%ORA11GR2> variable dname varchar2(14) ops$tkyte%ORA11GR2> variable loc varchar2(13) ops$tkyte%ORA11GR2> variable last_mod varchar2(50) ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> begin 2 :deptno := 10; 3 select dname, loc, to_char( last_mod, "DD-MON-YYYY HH.MI.SSXFF AM TZR" ) 4 into :dname,:loc,:last_mod 5 from dept 6 where deptno = :deptno; 7 end; 8 / PL/SQL procedure successfully completed. which we can see is currently ops$tkyte%ORA11GR2> select :deptno dno, :dname dname, :loc loc, :last_mod lm 2 from dual; DNO DNAME LOC LM ---------- ---------- ---------- ---------------------------------------10 ACCOUNTING NEW YORK 17-FEB-2010 PM -05:00 it would use this next update statement to modify the information. The last line does the very important check to make sure the timestamp has not changed and uses the built-in function TO_TIMESTAMP_TZ (tz is short for time zone ) to convert the string we saved in from the SELECT statement( ) back into the proper datatype. Additionally, line 3 of the UPDATE statement( ) updates the LAST_MOD column to be the current time if the row is found to be updated:
Figure 13-2. Hash partition insert example As noted earlier, hash partitioning gives you no control over which partition a row ends up in. Oracle applies the hash function and the outcome of that hash determines where the row goes. If you want a specific row to go into partition PART_1 for whatever reason, you should not in fact, you cannot use hash partitioning. The row will go into whatever partition the hash function says to put it in. If you change the number of hash partitions, the data will be redistributed over all of the partitions (adding or removing a partition to a hash partitioned table will cause all of the data to be rewritten, as every row may now belong in a different partition). Hash partitioning is most useful when you have a large table, such as the one shown in the Reduced Administrative Burden section, and you would like to divide and conquer it. Rather than
Figure 4-17. Add the collection to LayoutRoot. Notice how when you drag it over the LayoutRoot in the Objects and Timeline panel, you get a message telling you that Blend is going to add a ListBox with an ItemsSource set to your collection. Also notice that when you drop the collection onto the LayoutRoot, it automatically creates a ListBox in the workspace and sets its ItemsSource to your collection. You should have what is shown in Figure 4-18.
Read-Write Properties
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AppDomain^ appDomain = AppDomain::CreateDomain("Reflection2"); Console::Write("Enter a pure or safe executable to execute:"); exeName = Console::ReadLine(); Console::WriteLine("Executing assembly {0}", exeName); // You must compile the example program with the /clr:pure or /clr:safe option appDomain->ExecuteAssembly(exeName); } catch(Exception^ e) { Console::WriteLine("{0} {1}", e->Message, e->StackTrace); } Console::WriteLine("Finished."); } Try compiling reflection2.cpp with the /clr:pure option and running the code in Listing 10-19 using reflection2.exe as the input. The output of Listing 10-19 is as follows: Executing assembly reflection2.exe Hello! Dynamic Call succeeded! Finished. In this example, execution of the loaded assembly occurs synchronously, as you can discover by entering an executable that blocks waiting for input from the user. The following session demonstrates this: Enter a pure or safe executable to execute:appdomain_execute_assembly.exe Executing assembly appdomain_execute_assembly.exe Enter a pure or safe executable to execute:appdomain_execute_assembly.exe Executing assembly appdomain_execute_assembly.exe Enter a pure or safe executable to execute:reflection2.exe Executing assembly reflection2.exe Hello! Dynamic Call succeeded! Finished. Finished. Finished. For asynchronous execution, you could certainly create a secondary thread and launch another app domain on a secondary thread. Application domains are powerful, convenient, and have low overhead, much lower than the alternative of creating a new process.
Using Type Level Roles
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