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Before digging into real live Cocoa classes, let s take a look at some structs that Cocoa provides for our benefit.

The SAX API defines four core event handlers, encapsulated within the EntityResolver, DTDHandler, ContentHandler, and ErrorHandler interfaces of the org.xml.sax package. The ContentHandler is the primary interface that most applications need to implement. It contains callback methods for the startDocument, startElement, endElement, and endDocument events. Your application must implement the necessary SAX event interface(s) to define your specific implementation of the event handlers with which you are interested.

public void PlaceBid(int itemId, Bid bid) { using (ItemDAO persister = new ItemDAO()) { Item item = persister.LoadWithBids(itemId);

} } catch (Exception ex) { if (_connection != null) { _connection.rollback(); } throw new TransactionException(ex); } finally { if (_connection != null) { _connection.close(); } } return operationResult; }

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You can choose from three data retrieval methods implemented in SQL Server 2005 and SQL Server 2008, and all the details regarding them are available in Books Online. In this chapter, we only need to know the bare essentials about these methods: The purpose of the value() method is to extract the value from a single XML data element (a singleton) and return it in the designated data type. We ll use this method to extract the values from the XML nodes. The purpose of the query() method is to read data from one or more XML nodes and return a sequence of XML data elements or a single XML data element. The query() method can also be used to create XML data, but in this chapter we ll only use it to retrieve data. The return type of the query() method is XML. We ll use this method to specify the target of the extraction operation and to transform the source data if needed. The purpose of the nodes() method is to read data from an XML entity and return a set of XML nodes. This method returns a row of XML data for each node in the XML entity that corresponds to the given criteria. We ll use this method to retrieve the data from the XML source in the form of a dataset representing a single entity or a single relationship between our entities. The execution of all three methods is governed through an XQuery statement or an XPath expression passed to each of the methods as an argument. A detailed explanation of XQuery and XPath expressions is once again outside the scope of this chapter, but a brief version of the explanation is presented in the sidebar, A few words on XPath expressions and XQuery statements.

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We ran into two pitfalls before starting our journey: fat messages and skinny messages. We would do well to keep these potential troublespots in mind before messages start swirling around. Now, we re ready to dive into a working example. We want an example we can sink our teeth into, so we ll develop the underpinnings of an asynchronous order processing system using JMS. Although we ll write gratuitous amounts of code, as an example of JMS, ours will fall well short of providing a comprehensive tour of JMS . Albeit easy to learn and use, JMS can be applied in a range of enterprise application integration ( EAI) and business-tobusiness (B2B) scenarios. Our example will illustrate merely one isolated application of JMS with a few pitfalls sprinkled in along the way to keep us on our toes. Throughout the rest of the chapter, we ll continue to refactor the application example, each time eliminating a weakness in its design.

PowerShell s security system isn t designed to prevent anyone from typing in, and running, whatever commands they have permission to execute. The idea is that it s pretty difficult to trick a user into typing a long, complicated command, so PowerShell

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