c# print barcode labels Customer NRZBB 2 Customer MLTDN in Visual Studio .NET

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Inside Microsoft SQL Server 2008: T-SQL Programming
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If you want to create XML with nested elements for child tables, you have to use subqueries in the SELECT part of the query in the PATH mode . Subqueries have to return a scalar value in SELECT clause . However, you know that a parent row can have multiple child rows; a customer can have multiple orders . You return a scalar value by returning XML from the subquery . Then the result is returned as a single scalar XML value . You format nested XML from the subquery with the FOR XML clause, as you format XML in outer query . Additionally, you have to use the TYPE directive of the FOR XML clause to produce a value of XML data type, and not XML as text, which cannot be consumed by the outer query . The following query shows this technique for creating the same XML that I created in the FOR XML EXPLICIT part of this section . Note the subquery with the FOR XML PATH clause and the TYPE directive .
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SELECT Customer.custid AS [@custid], Customer.companyname AS [@companyname], (SELECT [Order].orderid AS [@orderid], [Order].orderdate AS [@orderdate] FROM Sales.Orders AS [Order] WHERE Customer.custid = [Order].custid AND [Order].orderid %2 = 0 ORDER BY [Order].orderid FOR XML PATH('Order'), TYPE) FROM Sales.Customers AS Customer WHERE Customer.custid <= 2 ORDER BY Customer.custid FOR XML PATH('Customer');
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The result is, as expected, the same as the result of the query that used EXPLICIT mode to format the XML returned:
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<Customer custid="1" companyname="Customer NRZBB"> <Order orderid="10692" orderdate="2007-10-03T00:00:00" <Order orderid="10702" orderdate="2007-10-13T00:00:00" <Order orderid="10952" orderdate="2008-03-16T00:00:00" </Customer> <Customer custid="2" companyname="Customer MLTDN"> <Order orderid="10308" orderdate="2006-09-18T00:00:00" <Order orderid="10926" orderdate="2008-03-04T00:00:00" </Customer> /> /> />
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/> />
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Shredding XML to Tables
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Now that I ve shown you how to create XML from relational data, I want to introduce the opposite process . Converting XML to relational tables is known as shredding XML . You can do this by using the nodes method of the XML data type, which I will describe later in this chapter . Starting with SQL Server 2000, you can do this in T-SQL with the OPENXML rowset function . In this section, I will talk about this function . The OPENXML function provides a rowset over in-memory XML documents using DOM presentation . Before parsing the DOM, you have to prepare it . To prepare the DOM
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13 XML and XQuery
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presentation of XML, you have to call the system stored procedure sp_xml_preparedocument . After you shred the document, you have to remove the DOM presentation using the system procedure sp_xml_removedocument . The OPENXML function uses the following parameters:
n n n n
An XML DOM document handle, returned by sp_xml_preparedocument An XPath expression to find the nodes you want to map to rows of a rowset returned A description of the rowset returned Mapping between XML nodes and rowset columns
The document handle is an integer . This is the simplest parameter . The XPath expression is specified as rowpattern, which defines how XML nodes translate to rows . The path to a node is used as a pattern; nodes below the selected node define rows of the returned rowset . If you do not provide a description of the rowset returned, the OPENXML function returns a so-called edge table . Every edge in the parsed XML document tree maps to a row in the rowset; this means that this table has all possible information about the XML parsed, and you can use T-SQL statements to extract only the information you need from it . The following query shows you the edge table using an XML document very similar to the previous examples in this chapter . It extracts Customer nodes, meaning each Customer element; the rowpattern XPath expression is /CustomersOrders/Customer :
DECLARE @DocHandle AS INT; DECLARE @XmlDocument AS NVARCHAR(1000); SET @XmlDocument = N' <CustomersOrders> <Customer custid="1"> <companyname>Customer NRZBB</companyname> <Order orderid="10692"> <orderdate>2007-10-03T00:00:00</orderdate> </Order> <Order orderid="10702"> <orderdate>2007-10-13T00:00:00</orderdate> </Order> <Order orderid="10952"> <orderdate>2008-03-16T00:00:00</orderdate> </Order> </Customer> <Customer custid="2"> <companyname>Customer MLTDN</companyname> <Order orderid="10308"> <orderdate>2006-09-18T00:00:00</orderdate> </Order> <Order orderid="10926"> <orderdate>2008-03-04T00:00:00</orderdate> </Order> </Customer> </CustomersOrders>';
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