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The AUTO vs. NESTED Mode Sam ples sect ion describes a T- SQL st at em ent for a URL t hat com put es a sum wit h a GROUP BY clause. Unfort unat ely, t he sam e st at em ent fails w hen ex ecut ed fr om wit hin an XML t em plat e file rat her t han a URL. How ev er, y ou can st ill perform aggregat es wit h SELECT st at em ent s t hat include GROUP BY clauses. The t r ick is t o cr eat e a v iew wit h t he GROUP BY clause and aggr egat e funct ion. Then use t he v iew as t he source for a SELECT st at em ent inside a t em plat e file. The t em plat e file r et ur ns rows wit h aggr egat ed v alues based on t he com put at ions perform ed in t he v iew t hat serv es as it s source. The follow ing scr ipt creat es a v iew based on t he T- SQL st at em ent used t o populat e Figure 6- 9. Recall t hat t he figur e excerpt s t he out com e from a T- SQL st at em ent in a URL t hat groups and aggr egat es colum n values fr om a r ow source. The SELECT st at em ent for t he Order Tot alView v iew and t he quer y generat ing t he result set excerpt ed in Figur e 6- 9 are ident ical except for t he FOR XML clause, which is m issing fr om t he v iew. This v ar iance is because y ou want t he view t o ret ur n a t radit ional rowset . A second quer y in a t em plat e file can r eference t he Order Tot alView v iew as it s source argum ent in t he FROM clause. I t is in t he t em plat e file t hat y our applicat ion can apply XML form at t ing t o t he rowset ret ur ned by t he v iew. --CreateOrderTotalView.sql USE Northwind GO CREATE VIEW OrderTotalView AS SELECT OrderID, CAST(SUM(ExtendedPrice) AS DEC(8,2)) OrderTotal FROM Invoices GROUP BY OrderID GO The XML t em plat e file can cont ain t he following XML scr ipt . By using t he Order Tot alView v iew as it s source, t he query in t he t em plat e file draws on a rowset w it h aggr egat ed ext ended pr ice across t he line it em s for each order in t he I nv oices view . An alias ( I nv oices) for t he OrderTot alView v iew enables t he SELECT st at em ent t o show I nv oices as t he ult im at e source for t he r esult s. The XML form at t ed result set fr om running t his t em plat e file looks ident ical t o t he one in Figur e 6- 9. However, t he cont ent s of t he Addr ess box are m uch m or e basic. The URL m er ely references t he t em plat e file: http://ccs1/MyNwind/template/tmpSelectFromAggregatingView.xml .
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<!--tmpSelectFromAggregatingView.xml--> <ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <sql:query > SELECT * FROM OrderTotalView AS Invoices FOR XML AUTO </sql:query> </ROOT> The solut ion is desirable if y ou want a report w it h t he t ot als for all t he orders, but fr equent ly applicat ions r equire a result for j ust one it em or som e subset of it em s. To m eet t his r equirem ent , you can aggr egat e by gr oup and t hen filt er based on t he group values y our applicat ion needs t o r et urn. By r efer encing a t able- valued user - defined funct ion fr om a query in a t em plat e file, you can enable a t em plat e file t o dy nam ically filt er a rowset w it h r ows cont aining aggr egat ed values at run t im e. You can apply t he logic in t he pr eceding paragraph t o ext ending t he previous sam ple. The pr ocess requir es t wo st eps. First creat e a user- defined funct ion nam ed OrderTot alFunct ion t hat r et urns a t able based on t he I nv oices v iew. The funct ion s SELECT st at em ent aggr egat es t he Ex t endedPrice colum n fr om t he I nv oices view by Order I D. The @My OrderI D par am et er in t he funct ion perm it s a calling rout ine t o det er m ine for which order t he funct ion r et ur ns a t able. I n t his case, t he t able consist s of a single row. Second creat e an XML t em plat e file ( t m pSelect From Aggregat ingTableUDF.xm l) t hat references t he user - defined funct ion. The t em plat e file can use t he funct ion as t he source for a SELECT st at em ent . I n addit ion, t he t em plat e file can pass a param et er t o t he funct ion t o designat e which r ow t he user- defined funct ion should ret urn. At run t im e for t he t em plat e, users can dy nam ically specify t he OrderI D of t he order for which t hey want a t ot al. Here s t he script for cr eat ing t he user- defined funct ion. I t s SELECT st at em ent is ident ical t o t he SELECT st at em ent in t he v iew for t he pr eceding sam ple except for t he HAVI NG clause t hat filt ers t he r esult set and t he param et er, @MyOr derI D, t hat facilit at es t he r un- t im e designat ion of w hich order t o r et urn t he sum for. See t he Creat ing and I nv ok ing Table- Valued UDFs sect ion in Chapt er 5 for a r ev iew of t he synt ax for user - defined funct ions. --CreateOrderTotalFunction.sql USE Northwind GO CREATE FUNCTION OrderTotalFunction(@MyOrderID int) RETURNS TABLE AS RETURN( SELECT OrderID, CAST(SUM(ExtendedPrice) AS DEC(8,2)) OrderTotal FROM Invoices GROUP BY OrderID HAVING OrderID = @MyOrderID ) GO The follow ing XML docum ent invok es t he Order Tot alFunct ion udf. This docum ent fulfills t he second st ep in t he applicat ion dev elopm ent pr ocess. I t defines a param et er nam ed MyOrderI D wit h a default value. Ther efor e, users can get a result set from r unning t he t em plat e file whet her or not t hey specify a param et er value. Figur e 6- 14 show s t he XML form at t ed result set in t he browser from a URL t hat specifies 10252 as t he param et er v alue. <ROOT xmlns:sql="urn:schemas-microsoft-com:xml-sql"> <!--tmpSelectFromAggregatingTableUDF.xml--> <sql:header> <sql:param name= MyOrderID >10250</sql:param>
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</sql:header> <sql:query > Select * FROM OrderTotalFunction(@MyOrderID) FOR XML AUTO </sql:query> </ROOT>
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Figu r e 6 - 1 4 . Th is br ow se r sh ow s t h e re su lt se t fr om an X M L t em pla t e file t h a t in voke s a u ser - d e fin e d fun ct ion t o r e t u rn a n a ggr eg at e d va lu e for t h e r ow s m at ch in g a spe cific Ord er I D .
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