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Uses an ADO.NET connection manager to read data from a DataReader and channel it into the Data Flow. Connects to an Excel file using the Excel connection manager. Connects to CSV files, for example. Performs data access via an OLE DB provider. Imports data stored in the SQL Server RAW file format. It is a rapid way to import data that has perhaps been output by a previous package in the RAW format. Accesses data held in XML format.

You can use templates to execute queries against your SQL Server with SQLXML. Templates are just encapsulation of the technologies we ve already looked at in this chapter. These templates can use SQL or XPath queries. You have to use the annotated schema that you create for your XML view with your template. The schema can be inline or loaded via a file. To specify your template, you ll create a file that uses the urn:schemas-microsoft-com:xml-sql namespace. Then, once you set that namespace, you can pass in your SQL or XPath queries in the template. SQLXML will cache your templates in order to improve performance. The following template executes a SQL query: <Root><sql:query xmlns:sql=""urn:schemas-microsoft-com:xml-sql""> SELECT * FROM Authors FOR XML AUTO</sql:query></Root> To use an XPath query, we would change the sql:query syntax to sql:xpath-query. The sample that follows queries for all authors: <Root><sql:xpath-query xmlns:sql=""urn:schemas-microsoft-com:xml-sql"">/Authors </sql:xpath-query></Root> You ll see how to use templates from code in the section Programming SQLXML from .NET and COM later in this chapter.

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Again in keeping with the open nature of the SSIS architecture, you can also write custom data sources, which I cover in 16. Event Handlers The Windows OS is, in many ways, driven by events. If an application window gets resized, a message is raised to notify the OS that a window-resize event has been fired. For ease of software development, constructs such as the .NET Framework encapsulate these OS messages and present them in an easy-to-handle event that can be captured and acted on. In.NET, for example, the System.Windows.Forms.Form class uses the OnResize event. SSIS extends and exposes the event model further and offers the raising of events held in an instance of the Microsoft.SqlServer.Dts.Runtime.DtsEventHandler class. 8 discusses event handlers in more detail. Data Flow I m postponing the architectural discussion of the Data Flow engine until the next section in this chapter. It is an important and wide-ranging topic that requires the most diligent investigation and documentation. It s also a pretty advanced topic that seems to get more complex the deeper one probes into it. Custom Data Flow Components Custom Data Flow components is one of my favorite topics, simply because they empower the developer to produce any kind of transform by leveraging just a few interfaces defined in the SSIS object model. 16 discusses the creation of custom components in depth.

To transform relational data into XML data, the FOR XML keyword is still supported in SQL Server 2005 with some enhancements The major enhancements in FOR XML are support for the XML datatype, enhancements to make writing FOR XML EXPLICIT statements much easier, and support for inline XSD If you ve never worked with FOR XML EXPLICIT, count your blessings The syntax of using this capability was not for the faint of heart If you needed to perform any marginally complex XML formatting in SQL Server 2000, you would have to unfortunately resort to FOR XML EXPLICIT To support returning values using the XML datatype, FOR XML supports an extra directive called TYPE By passing this directive to your call, instead of generating the XML and returning it as text, SQL returns back the result as an XML datatype.

Once we ve covered each type of SQL Server assembly, we pan out again to look at a couple of more general issues relating to all assembly types. In this chapter, we consider two distinct but related topics: error handling and debugging. We start by looking at debugging SQL Server assemblies, both in the full version of Visual Studio 2005 and in the pared-down version that ships with SQL Server 2005. Then we examine how to handle any errors that occur, including sending e-mails from a SQL assembly and writing entries to an event log.

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