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In this example, the two sets of numbers are equal; two lines were deleted, and two lines added However, if I add 10 lines of code in my patch, where formerly there were only two, the two lengths would be different Similarly, if previous hunks changed the number of lines before this, the two line numbers would be different The text after the second @@ can be anything; here it lists the function this hunk is within to make it easier to locate the appropriate text in an editor This is an option provided by a command-line option to diff After the hunk header, the patch shows the changes made It will show a few lines on either side of the actual change as a courtesy, to provide context Lines that are removed are prefixed with -, lines that are added are prefixed with +.

To resolve the issue of high CPU consumption, you may need to remove the offending session to free resources for the other sessions in the database. If the troubling database session is an ad hoc query, Concurrent Manager job, or Forms session, it may be possible to cancel the process from within the application. Large resource consuming sessions could also arise from poorly written custom queries, bugs in application code, invalid database statistics, or a corrupt index. Additional research will be required to determine the root cause. Be certain that preventative maintenance tasks are executing properly (these are outlined in 6 of this guide).

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class SignupForm(forms.Form): username = forms.CharField(max_length=30) email = forms.EmailField() password1 = forms.CharField(max_length=30) password2 = forms.CharFIeld(max_length=30) Aside from the use of classes from django.forms instead of django.db.models, this starts out looking similar to the way you define model classes in Django: simply subclass the appropriate base class and add the appropriate fields. But the code is not quite perfect. HTML provides a special form input type for handling passwords <input type="password"> which would be a more appropriate way to render the password fields. You can implement this input type by changing those two fields slightly: password1 = forms.CharField(max_length=30, widget=forms.PasswordInput()) password2 = forms.CharField(max_length=30, widget=forms.PasswordInput())

When lines are merely changes, as they are here, they re represented as lines being removed, followed by lines being added Following this would be a second hunk for that file, if it were changed in more than one place, or another Index: line marking the beginning of changes to a new file If this were the only change made, Listing 3-2 would be the entire contents of the file Creating a Patch Creating a patch from CVS is easy Make the changes to your local tree, make sure it s synced to current CVS with cvs up, and run cvs diff -pu This uses two command-line options: -u requests a unified patch in unified format (exemplified in Listing 3-2), and -p asks diff to include the function name in the hunk header, as seen in the example This command will print the patch to your console.

In order to send this to a developer, you ll likely want to save it to a file This can be done with the UNIX shell s redirection functionality:.

The PasswordInput widget will render itself as an <input type="password">, which is exactly what you want. This also shows off one major strength of the way Django s form system separates the validation of data, which is handled by the field, from the presentation of the form, which is handled by the widgets. It s fairly common to run into situations where you have a single underlying validation rule that needs to work with multiple fields that all become different types of HTML inputs. This separation makes it easy: you can reuse a single field type and just change the widget. While you re at it, let s make one more change: password1 = forms.CharField(max_length=30, widget=forms.PasswordInput(render_value=False)) password2 = forms.CharField(max_length=30, widget=forms.PasswordInput(render_value=False)) The render_value argument to the PasswordInput tells it that even if it has some data, it shouldn t show it. An error a user makes while entering the password should completely clear the field to make sure the user types it in correctly the next time.

The solution to the high consuming session may involve an application patch, query rewrite, gathering statistics, or rebuilding indexes. If the process is simply a long running process, it may be scheduled after hours or run against a reporting database. The primary concern is to ensure the responsiveness of the business transactions.

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