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All SQLAlchemy Object-Relational API queries are performed with query objects that are created from the session The simplest way to create and use a query object is like this: >>> page_q = sessionquery(modelPage) >>> for page in page_q: .. print pagetitle .. 2008-09-04 22:13:03,885 INFO sqlalchemyenginebaseEngine0x.30 SELECT pageid AS page_id, pagecontent AS page_content, pageposted AS page_posted, pagetitle AS page_title, pageheading AS page_heading FROM page 2008-09-04 22:13:03,885 INFO sqlalchemyenginebaseEngine0x.30 [] Test Page In this example, you have iterated over every page in the database, and SQLAlchemy has created a page object for each so that you can access its id attribute and print its title You can see the SQL used and that the title of the test page, being the only page in the database at the moment, is correctly printed.

using the secret key (gm)a. Mallory will also be able to see any message that Bob attempts to send to Alice using the secret key (gm)b. Mallory, as a man-in-the-middle, can impersonate both Alice and Bob. In some scenarios, however, it is possible to apply DH such that Alice and Bob can detect if there is a man-in-the-middle. Phil Zimmermann, in his Voice-over-IP (VoIP) protocol ZRTP , proposes that both parties compute the hash of the shared secret h((ga)b) that they are using (Zimmermann 2006). Both communication endpoints (e.g., phones) could display the hash. Should Alice want to verify that there is no man-in-the-middle, she could ask Bob to read the hash. Note that when Mallory is actively participating as a man-in-the-middle, the shared secret that Alice uses with Mallory (gm)a and the shared secret that Bob uses with Mallory (gm)b are different. Their hashes will also be different! If Bob reads a different hash value than what Alice expects, she knows there is a man-in-the-middle!4

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Let s take a closer look at some of the properties of the query object You can use the same query object more than once, so let s use its all() method to get all the pages in one go as a list of Page objects: >>> page_qall() [<modelPage object at 0x72670>] Query objects also have a one() method that returns just one object, raising an exception if there are zero or more than one results Another useful method on query objects is first(), which returns the first result or None if there are no results, again the log output isn't included: >>> page = page_qfirst() >>> pagetitle u'Test Page' Query objects also allow you to set a LIMIT and OFFSET by treating the query object as a list that can be sliced.

Note This information is the very least you need to know about XML. The XML file presented here is not

For example, to retrieve results only from 2 to 5, you would write this: >>> page_q[2:5] 2008-09-04 22:23:49,556 INFO sqlalchemyenginebaseEngine0x.30 SELECT pageid AS page_id, pagecontent AS page_content, pageposted AS page_posted, pagetitle AS page_title, pageheading AS page_heading FROM page LIMIT 3 OFFSET 2 2008-09-04 22:23:49,556 INFO sqlalchemyenginebaseEngine0x.30 [] [] Of course, you have only one page, so this returns an empty list, but you can see from the logged SQL that LIMIT and OFFSET were applied correctly Most of the time, you will want to be more specific about the results you return SQLAlchemy allows you to do this in a number of ways First, if you know the primary key of the row you are looking for, you can use the page query s get() method: >>> page_qget(1) <model.

4. In theory, if Mallory knew exactly when in the conversation Alice was going to query Bob for the hash, and could impersonate Bob s voice, she might be able to still operate undetected as a man-in-themiddle. However, Mallory s job is extremely difficult, and Zimmermann argues that even with the resources of the NSA, Mallory s probability of success is too low to be pragmatic.

even a proper XML file it lacks a document type definition. And you haven t even started to learn about namespaces and other fun details of XML. But you do know enough now to start reading and writing XML files using Qt.

Page object at 0x72670> Notice this time that SQLAlchemy didn t need to send any SQL to retrieve this object because it was already in the session from the queries you have already run Query objects also have filter() and filter_by() methods Both are similar, but filter() takes an expression of the type you saw earlier, whereas filter_by() takes keyword arguments representing attributes on the class you are querying Their use is best demonstrated with examples:.

Qt supports two ways of handing XML files: DOM and SAX (described in the following sections). Before you get started, you need to know that the XML support is part of the Qt module QtXml, which means that you are required to add a line reading QT += xml to your project file to include it.

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