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Once we have an XML document, the XMLDocument class provides a number of methods available to us for working with the XML data. We need to extract the name of the trigger to insert into the table, so we ll call the SelectSingleNode method of the XmlDocument. This takes an XPath expression that points to the node in the document we want to access. In this case, we want to retrieve the text within the <EventType> element beneath the <EVENT_INSTANCE> element. The XPath expression to do this is "//EVENT_INSTANCE/EventType/text()". The final task is to perform a T-SQL insertion into the EventDataDumpData table within our database: XmlNode xmlNd = xmlDoc.SelectSingleNode("//EVENT_INSTANCE/EventType/text()"); string eventType = xmlNd.Value; using (SqlConnection cn = new SqlConnection("context connection=true")) { cn.Open(); string sql = "INSERT INTO AssembliesTesting..EventDataDumpData " + "(TriggerName, XMLData) VALUES('" + eventType + "',' " + evData + "')"; SqlCommand sqlComm = new SqlCommand(sql, cn); sqlComm.ExecuteNonQuery(); sqlComm.Dispose(); } } } The following code creates the trigger assembly in SQL Server 2005, which is set to fire for all events in the current database. CREATE ASSEMBLY EventDataDump AUTHORIZATION [dbo] FROM 'C:\Program Files\SQL Server Assemblies\EventDataDump.dll' WITH PERMISSION_SET = SAFE GO CREATE TRIGGER XMLDump ON DATABASE FOR DDL_DATABASE_LEVEL_EVENTS AS EXTERNAL NAME EventDataDump.Triggers.EventDataXMLDump GO We can test the trigger by creating a simple stored procedure that will invoke the trigger, insert the XML EventData into our table, and then list the output to a results window. Notice that we need to set QUOTED_IDENTIFIERS OFF in case there are quotation marks within the code. SET QUOTED_IDENTIFIER OFF GO CREATE PROCEDURE FirstXML AS BEGIN SELECT "Just A Test" END GO SELECT * FROM EventDataDumpData

colors, and supports not only solid lines but an assortment of dash patterns. Take a look at the screen shots in Figure 12-5, which are taken from Apple s QuartzDemo sample code, to see a sampling of what Quartz 2D can do for you.

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The service contract expresses the methods that are exposed to the outside world. The service contract is also commonly referred to as the service interface or the exposed behavior of the service. It describes what you can expect from the service, and its policy describes what requirements the service has. Service contracts are implemented as .NET interfaces. The service contracts are implemented as .NET classes implementing the .NET interface. To make the classes WCF service contracts, you must annotate the interface with the [ServiceContract] attribute. The operations need to be annotated with the [OperationContract] attribute. You can find the ServiceContractAttribute and OperationContractAttribute classes in the System.ServiceModel namespace, which you have to include with a using statement. Listing 3 1 shows the service contract defined as a .NET interface for QuickReturns Ltd., including two operation contracts. Listing 3 1. ServiceContract for the Trade Service using System.ServiceModel; using QuickReturns.StockTrading.ExchangeService.DataContracts; namespace QuickReturns.StockTrading.ExchangeService.Contracts { [ServiceContract(Namespace = "http://QuickReturns")] interface ITradeService { [OperationContract()] Quote GetQuote(string ticker); [OperationContract()] void PublishQuote(Quote quote); } } This service is the exchange of the stock-trading application for QuickReturns Ltd. The contract of this service defines the interaction that is going on between the sellers and buyers on a stock market. Sellers offer their stocks by publishing quotes. A quote defines the company the stock is for and what price the seller wants for it. The PublishQuote method is able to publish quotes from sellers on the trade

Figure 12-5. Some examples of what Quartz 2D can do, from the Quartz Demo sample project provided by Apple

Now that you have a basic understanding of how Quartz 2D works and what it is capable of, let s try it out.

service. The buyers will query the trade service to get a quote on a stock from a specific company. The GetQuote method is able to retrieve published quotes from the service. When the buyer finds an appropriate seller, the actual exchange of stocks can take place by a different service (which will be covered later in this book).

The following is sample XML output. This is a cut and paste from the XML query pane, which is displayed when you click the XML data column. <EVENT_INSTANCE> <EventType>CREATE_PROCEDURE</EventType> <PostTime>2004-10-23T22:17:10.593</PostTime> <SPID>55</SPID> <ServerName>XP-PRO</ServerName> <LoginName>XP-PRO\rdewson</LoginName> <UserName>XP-PRO\rdewson</UserName> <DatabaseName>AssembliesTesting</DatabaseName> <SchemaName>dbo</SchemaName> <ObjectName>FirstXML</ObjectName> <ObjectType>PROCEDURE</ObjectType> <TSQLCommand> <SetOptions ANSI_NULLS="ON" ANSI_NULL_DEFAULT="ON" ANSI_PADDING="ON" QUOTED_IDENTIFIER="OFF" ENCRYPTED="FALSE" /> <CommandText>CREATE PROCEDURE FirstXML AS BEGIN SELECT "Just A Test" END </CommandText> </TSQLCommand> </EVENT_INSTANCE> The preceding trigger would be useful in a testing database, as it allows you to create the object you are going to work with and lets you see the layout of the different event types.

In Xcode, create a new project using the view-based application template, and call it QuartzFun Once it s created, expand the Classes and Resources folders, and single-click the Classes folder so we can add our classes The template already provided us with an application delegate and a view controller We re going to be executing our custom drawing in a view, so we need to create a subclass of UIView where we ll do the drawing by overriding the drawRect: method Create a new Cocoa Touch Class file, and select Objective-C class and then a UIView for Subclass of Just to repeat, use a Subclass of UIView and not NSObject as we ve done in the past Call the file QuartzFunViewm, and be sure to create the header as well.

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