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close(); The root element of a DOM tree can be retrieved from the document object by using the documentElement() method Given that element, it is easy to find the child nodes Listing 8-14 shows you how to use firstChild() and nextSibling() to iterate through the children of the document element The children are returned as QDomNode objects the base class of both QDomElement and QDomText You can tell what type of node you are dealing with by using the isElement() and isText() methods There are more types of nodes, but text and element nodes are most commonly used You can convert the QDomNode into a QDomElement by using the toElement() method The toText() method does the same thing, but returns a QDomText instead You then get the actual text using the data() method inherited from QDomCharacterData.

add_all([comment1, comment2]), but SQLAlchemy was smart enough to realize that if they had been appended to an object that was.

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already in the session, then they needed to be added too When sessioncommit() was called, the autoflush=True option to the session caused the session to be flushed, and the SQL for the two required INSERT statements to be sent to the database before being committed This behavior is possible only because of the relationships that were defined when the tables and mappers were created in the modelpy file earlier in the chapter If you recall, the mapper for the page table looks like this: ormmapper(Page, page_table, properties={ 'comments':ormrelation(Comment, backref='page'), 'tags':ormrelation(Tag, secondary=pagetag_table) }) Notice that you specified a backref called page on the Comments class This means you should be able to access the page object from a comment s page attribute as well as accessing a list of comments from a page s comments attribute Let s see: >>> comment_q = sessionquery(model.

For the element object, you can get the name of the tag from the tagName() method Attributes can be queried using the attribute(const QString &, const QString &) method It takes the attribute s name and a default value In Listing 8-14, the default value is not set Listing 8-14 Finding the data from the DOM tree QDomElement documentElement = documentdocumentElement(); QDomNode node = documentElementfirstChild(); while( !nodeisNull() ) { if( nodeisElement() ) {.

output sanitization step from resulting in an exploitable XSS vulnerability (and will of course also reduce the risk of other classes of vulnerabilities that can be exploited based on untrusted input).

Comment) >>> comment = comment_qget(2) 2008-09-04 23:53:21,084 INFO sqlalchemyenginebaseEngine0x.30 BEGIN 2008-09-04 23:53:21,085 INFO sqlalchemyenginebaseEngine0x.30 SELECT commentid AS comment_id, commentpageid AS comment_pageid, commentcontent AS comment_content, commentname AS comment_name, commentemail AS comment_ email, commentcreated AS comment_created FROM comment WHERE commentid = 2008-09-04 23:53:21,086 INFO sqlalchemyenginebaseEngine0x.30 [2] >>> page = commentpage 2008-09-04 23:53:28,047 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 WHERE pageid = 2008-09-04 23:53:28,048 INFO sqlalchemyenginebaseEngine0x.30 [1] >>> page <modelPage object at 0x72670> >>> pageid 1 >>> pagetitle u'New Title' As you can see, it is the same page with the updated title.

QDomElement qDebug() << qDebug() << << }

In many of the contexts covered in the following sections, XSS is prevented by escaping certain metacharacters such that strings are treated as uninterpreted literals, rather than HTML markup. In HTML, escaping is accomplished by replacing characters with their corresponding HTML character reference (see the HTML 4.01 Specification, Section 5.3, for more information). Character references can be numeric in the form &#D; where D is the decimal character number, or &#xH; where H is the character number in hexadecimal notation. For example, the character reference A represents the letter A. Alternatively, so-called entity references are available, which refer to the character with a mnemonic name. For example, the entity reference < refers to the less-than symbol, <. We assume in the following discussion that an HTML escape function is available that escapes at least the characters listed in Table 10-1 into their corresponding HTML character references. Table 10-1. Minimum Set of Characters to Be Escaped by HTML Escape Function

You ll see a lot more of the ObjectRelational API as you read the SimpleSite tutorial chapters As well as seeing how SQLAlchemy works in the context of a Pylons application, you ll see how to work with tags as an example of a many-to-many relationship, how to use ORDER BY clauses with query objects, and how to hook SQLAlchemy up to FormEncode to validate data..

element = node.toElement(); "ELEMENT" << element.tagName(); "ELEMENT ATTRIBUTE NAME" element.attribute( "name", "not set" );

Python 2.5 comes preinstalled on Mac OS X Leopard complete with Easy Install, so Leopard users can get started creating a virtual Python environment and installing Pylons straightaway. Older versions of Mac OS X also include Python, but the version included is sometimes either one or two years old because of Apple s release cycle. The overwhelming recommendation of the MacPython community is for users of old versions of Mac OS X to upgrade Python by downloading and installing a newer version. Visit http://www.python.org/download/mac/ for more details.

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