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DECLARE @x xml = N'<inventory store-num = "1983"> <product ean = "0051500241776"> <name>Jif Creamy Peanut Butter</name> <size>28 oz</size> </product> <product ean = "0024600010030"> <name>Morton Iodized Sale</name> <size>26 oz</size> </product> <product ean = "0086600000138"> <name>Bumble Bee Chunked White Albacore in Water</name> <size>6 oz</size> </product> </inventory>'; DECLARE @handle int; EXEC sys.sp_xml_preparedocument @handle OUTPUT, @x; SELECT * FROM OPENXML ( @handle, N'//product', 3 ) WITH ( EAN nvarchar(15) N'./@ean[1]', Name nvarchar(100) N'./name[1]', Size nvarchar(100) N'./size[1]' ); EXEC sys.sp_xml_removedocument @handle;

Many frequently asked questions about SQL Server XML concern advanced topics such as using XML namespaces and retrieving all element names and values from an XML document. In this section, we will cover some of these advanced query topics.

Near real-time incremental loads When the CDC is performed by using the data model approach, then the incremental loads can, at best, be done in near real-time Each run of the incremental load process will synchronize a batch of transactions that will be queued

Different XML-based standards may have element names in common. It is not uncommon to see different XML-based standards that specify elements named Name and Price, for instance. Each of these element names can have a completely different meaning, depending on the standard. In one standard, the Name element might be a customer name; in another standard, it might be a product name. To differentiate between the different uses for the same name in different standards, XML provides the concept of XML namespace. An XML namespace is a qualifier for XML elements and attributes that allows you to associate them with XML documents. Using an XML namespace, you can differentiate between the Name elements used in different standards, as shown in listing 14.

Problem 13-1 Suppose a coil has an inductance of 0500 H, and the frequency of the ac passing through it is 600 Hz What is the inductive reactance

<customers:Name>John Jacob Jingleheimer-Smith</customers:Name> <products:Name>Little Red Wagon</products:Name>

10:

The XML namespace associates a namespace prefix (customers and products in listing 14) with a URI for a document. If you are using XQuery to query data that contains one or more explicit namespaces, you can use the XQuery declare element s namespace option to define the namespace in your query, as shown in listing 15. The results are shown in figure 8.

Using the preceding formula, calculate XL = 628 600 0500 = 188 This is rounded to three significant figures

up to be processed How near to real time the loads are is determined by the time it takes the incremental load to synchronize a batch without causing a measurable impact on the source system The methods available for performing near real-time incremental loads are using custom extract and load scripts and ETL tools like Oracle Data Integrator The custom scripts and ETL mappings created for performing initial loads can also be used to perform incremental loads by modifying the SQL to extract only the changed rows since the last run instead of the complete data

DECLARE @x xml = N' <sale xmlns:products = "urn:store:products" xmlns:customers = "http://www.tempuri.org/customerdata"> <customers:Name>Jerry Lee Lewis</customers:Name> <products:Name>Baby Grand Piano</products:Name> </sale>'; SELECT @x.query(N'declare namespace products = "urn:store:products"; /sale/products:Name/text()') AS ProductName; SELECT @x.query(N'declare namespace customers = "http://www.tempuri.org/ customerdata"; /sale/customers:Name/text()') AS CustomerName;

In this example, we ve defined two namespaces in the XML document: one to denote customer-specific elements and another for product-specific elements. When we query the data we use the XQuery declare namespace statement to assign a namespace prefix to a URI before we define the path expression. Once we ve declared the namespace, we can use the namespace prefix to differentiate between elements in the path expression even elements with the same local name (like the Name element in our example). SQL Server also provides a WITH XMLNAMESPACES clause that can be used with queries, common table expressions (CTEs), and data manipulation language (DML) statements to declare your XML namespaces. The example in listing 16 modifies the previous example to use the WITH XMLNAMESPACES clause to generate the same result.