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In a database environment, read consistency is an important concept Read consistency is a first requirement to guarantee correct query results, regardless of how long it runs and regardless what else happens simultaneously in the database The Oracle RDBMS must make sure that each SQL query creates a snapshot of the data at the point in time when the query started It needs this snapshot because a query should never see any uncommitted changes nor any changes that were committed after the query started Imagine the problems that would occur if one person was updating salaries (even making mistakes that had to be rolled back) while another person was running a payroll report Without read consistency, the payroll report might include old salaries, new salaries and salary mistakes and there would be no way to know which person was being paid incorrectly.

public class Student { // Declaring an instance variable. private String name; // Declaring a static/class variable. private static int nextAvailableStudentIDNo; static { // Initializing a static/class variable // within a static code block. nextAvailableStudentIDNo = 10000; } public Student { // Initializing an instance variable // within a constructor. setName("TBD"); // or: name = "TBD"; // etc. } // etc.

My personal preference is to use the latter style, as it s more readily apparent when such initialization takes place.

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def view_2(request): # ... t = loader.get_template('template2.html') c = RequestContext(request, {'message': 'I am the second view.'}, processors=[custom_proc]) return t.render(c) def view_3(request): # ... t = loader.get_template('template3.html') c = RequestContext(request, {'message': 'I am the third view.'}, processors=[custom_proc]) return t.render(c) def view_4(request): # ... t = loader.get_template('template4.html') c = RequestContext(request, {'message': 'I am the fourth view.'}, processors=[custom_proc]) return t.render(c) Let s step through this code: First, we define a function custom_proc. This is a context processor it takes an HttpRequest object and returns a dictionary of variables to use in the template context. That s all it does. We ve changed the four view functions to use RequestContext instead of Context. There are two differences in how the context is constructed. First, RequestContext requires the first argument to be an HttpRequest object the one that was passed into the view function in the first place (request). Second, RequestContext takes an optional processors argument, which is a list or tuple of context processor functions to use. Here, we pass in custom_proc, the custom processor we defined earlier. Each view no longer has to include app, user, or ip_address in its context construction, because those are provided by custom_proc. Each view still has the flexibility to introduce any custom template variables it might need. In this example, the message template variable is set differently in each view. In 4, we introduced the render_to_response() shortcut, which saves you from having to call loader.get_template(), then create a Context, and then call the render() method on the template. In order to demonstrate the lower-level workings of context processors, the previous examples didn t use render_to_response(). But it s possible and preferable to use context processors with render_to_response(). Do this with the context_instance argument, like so: from django.shortcuts import render_to_response from django.template import RequestContext

This means that the Oracle RDBMS must be able to reconstruct previous versions of the data in order to process queries We will not go into technical details here, but the Oracle RDBMS accomplishes this by using information stored in undo segments One way to think about undo segments is that they contain the before image of the data before any modification, though this is not technically precise Believe it or not, read consistency is even important in a single-user environment Suppose that upper management has decided to grant a salary raise of 50% to all employees who currently earn less than the average salary of their department You might want your salary to be checked last by the UPDATE statement, hoping that earlier salary raises have influenced your department s average salary in such a way that you became entitled to a raise, too.

Throughout the examples presented thus far in the book, whenever we ve needed to represent the notion of a date, we ve done so as a String variable. I d now like to introduce three predefined Java classes:

java.util.Calendar java.text.SimpleDateFormat java.util.Date as formal types to be used when declaring dates. The Calendar class s static getInstance method can be used to obtain a reference to a Calendar object representing the current date and time: Calendar rightNow = Calendar.getInstance(); We can also use a variety of overloaded setxxx methods defined by the Calendar class to craft a custom date/time of our liking, for example: Calendar cal = Calendar.getInstance(); // Happy new year! cal.set(2006, Calendar.JANUARY, 1); // year, month, date We may then obtain a Date rendition of such a Calendar instance by invoking its getTime method: Calendar cal = Calendar.getInstance(); // Happy new year! cal.set(2006, Calendar.JANUARY, 1); // year, month, date Date newYearsDay = cal.getTime();

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