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ntil now, you ve been focusing on what Django s libraries and components can do and how you can take advantage of them in your applications. But Django s code and the code you write using Django make up only half the story when it comes to practical, efficient web development. The other half consists of more general techniques and specific best practices. Some of these apply broadly to any sort of software development, while others apply more specifically to Python, Django, and the Web. In either case, they comprise a solid set of guidelines that can drastically improve your productivity and your ability to continuously produce working, useful code. In this chapter, I ll go over some techniques for organizing, maintaining, and deploying your code. As you read, keep in mind that most of these topics are large enough to fill entire books. For the most part, I ll provide a brief overview of a given practice and some examples showing how it s useful, but you should follow up with your own research to find the specific tools and techniques that best suit you.

Oracle Database 10g provides some additional tools for analyzing SQL statements beyond generating trace files. These tools may be used for tuning custom code as well as identifying issues with Oracle-provided code. SQL Tuning Advisor Along with the automatic database analysis tools introduced in Oracle10g, there is now an SQL Tuning Advisor (STA) whose purpose is to automate the SQL tuning process. The STA will analyze SQL statements for areas of improvement, looking for the same issues that the DBA would look for manually. Problems such as stale statistics, poor execution paths, and poorly structured SQL statements will be identified by the automatic analysis. As with the other automatic analysis tools, Oracle recommends using Enterprise Manager as the primary interface with the tool. However, it is still possible to manually execute the tool using the DBMS_SQLTUNE package. To manually use the STA to tune an SQL statement, use the CREATE_TUNING_TASK function followed by the EXECUTE_TUNING_TASK function. When the tuning task has been executed, a report can be generated. Here is an example: sql>exec dbms_sqltune.create_tuning_task( >sql_text => 'select * from emp where emp_id=101', >user_name => 'SCOTT', >scope => 'COMPREHENSIVE', >time_limit => 60, >task_name => 'tune_emp', >description => 'Task to tune a query on the EMP table')

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INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337

It is possible in GTK+ to create composite widgets. A composite widget is a GtkWidget composed of other GtkWidget objects, packed together in the ordinary ways described above. These widgets are just a set of various widgets packed into a container, but they contain their own APIs and signals affecting the composite widget as a whole. GtkDialog is one such widget. GtkDialog, shown in Figure 5-34, descends from GtkWindow and is useful to present or request small amounts of data. A GtkDialog is a window containing a GtkVBox for content, packed in the top of the GtkDialog and an action area on the bottom, which is a GtkHButtonBox where buttons are placed. When a GtkDialog object is shown (with gtk_widget_show()), the user will be presented with this dialog. When she clicks a button, the GtkDialog will emit the "response" signal. The callback will receive the GtkDialog that emitted the signal, and the response associated with the button.

There s a common problem that bites every software developer sooner or later; it s gotten me more times than I can count, and if you spend much time writing code it ll eventually bite you, too. This universal nemesis is the attack of the sudden bug. Imagine you ve got an application that you ve been working on for a while. You ve implemented all the features in your initial checklist, and they all work. Then you decide to get a little adventurous and add a couple extra bits to really make your application shine. But about halfway through you stop, save your work, fire up Django s development server to try out what you ve got so far, and. . . disaster. Instead of seeing your shiny new application in action, you re getting ugly error messages. You ve introduced a bug. But where is it And, more important, how can you recover an older version of your code that still worked Normally you d be out of luck: every time you make changes to a file full of code and save it, you re destroying whatever you had before. If your changes introduced a bug into the code and you didn t realize it in time, you face a major problem. This is precisely the sort of problem a version-control system (VCS) can solve for you. In a nutshell, a VCS is a piece of software designed to do two things:

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