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Alt hough it is good pract ice t o nam e t he root - level elem ent differ ent ly from ot her elem ent s wit hin an XML docum ent , y ou can see fr om t he SaveDBQuery AsXm lToFile pr ocedure and it s out put in Figure 12- 1 t hat SqlXm lCom m and perm it s you t o generat e an XML docum ent wit h t he root t ag nam e m at ching t he nam e of ot her elem ent s.
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Figu r e 1 2 - 1 . Th e ou t pu t from t h e Sa ve D BQu er yAsX m lToFile pr oce du re ope n e d in a br ow se r from W ind ow s Ex plor er .
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Cr e a t in g a n XM L D ocum e n t w it h a n An n ot a t e d Sch e m a
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Annot at ed schem as m ak e it possible for y ou t o specify t he form at for a result set . Wit h t he t ypical w ay of specify ing a FOR XML clause in a SELECT st at em ent , t he colum n values in a r esult set alw ays appear as at t ribut es.
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The follow ing XML scr ipt shows an annot at ed schem a for t he Shippers t able. The schem a is nam ed Shippers1.xsd and is locat ed in t he r oot folder for t he XMLSam ples solut ion. Aft er t he init ial XML docum ent declarat ion ( r em em ber , an XSD schem a is an XML docum ent ) , t he list ing specifies t wo nam espaces for defining t he t erm s in t he schem a. The first nam espace point s t o t he World Wide Web Consort ium sit e for t he XML schem a specificat ion. The second nam espace point s t o a Microsoft universal resource nam e ( urn) for m apping or annot at ed schem as. The body of t he schem a st art s by declar ing an elem ent nam ed Shipper . This elem ent has t he annot at ion at t ribut e sql: relat ion, which t ies it t o a dat a source nam ed Shippers. When an applicat ion w it h a connect ion t o t he Nort hw ind dat abase refer ences t his schem a, t he applicat ion can ext ract rows fr om t he Shippers t able according t o t he form at of t he schem a. This schem a specifies t he for m at t ing of ShipperI D colum n values as an at t ribut e and Com panyNam e and Phone as elem ent s. The use of t he sequence elem ent specifies t hat t he Com panyNam e elem ent m ust appear befor e t he Phone elem ent for each shipper . < xml version="1.0" encoding="utf-8" > <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:sql="urn:schemas-microsoft-com:mapping-schema"> <xs:element name="Shipper" sql:relation="Shippers"> <xs:complexType> <xs:sequence> <xs:element name="CompanyName" type="xs:string" /> <xs:element name="Phone" type="xs:string" /> </xs:sequence> <xs:attribute name="ShipperID" type="xs:int" /> </xs:complexType> </xs:element> </xs:schema> You can use an annot at ed schem a along w it h a SqlXm lCom m and obj ect t o ret ur n a r esult set from t he Shippers t able in t he Nort hw ind dat abase, and you can persist t hat r esult set locally by sav ing t he XML docum ent as a file. When y ou use an annot at ed schem a t o form at t he XML docum ent ret ur ned by a SqlXm lCom m and, y ou m ust specify t he locat ion of t he schem a file as one of t he SqlXm lCom m and proper t ies. Designat e t he pat h t o t he schem a w it h t he Schem aPat h propert y . You can specify t he pat h eit her as an absolut e address or as a relat iv e address. I f you use a r elat ive addr ess, t he addr ess is r elat ive t o t he .ex e file for t he .NET solut ion, which r esides in t he Bin subfolder of a solut ion s root folder. Therefore, if you sav e y our schem a in t he root folder for a solut ion, t he Schem aPat h propert y should be . ./ Schem anam e.xsd. The ../ designat es t he folder one up from t he Bin subfolder, w hich is t he root folder for a solut ion. When y ou use a Schem aPat h propert y, you m ust specify t he Com m andText propert y for a SqlXm lCom m and w it h an XPat h ex pression. When y ou w ant t o ret ur n a single t able and t he schem a denot es j ust one t able, t he XPat h expression is v ery sim ple. Just list t he out erm ost elem ent in t he schem a, which in t his case is Shipper. The RunAnnot at edSchem aXPat hQuery procedure shows t he synt ax for generat ing an XML docum ent based on t he Shippers1.xsd annot at ed schem a. Despit e m any sim ilar it ies w it h t he preceding sam ple, t his one differs in sev eral r espect s. The m ost im port ant differences appear in bold t ype. Not ice t hat t he SqlXm lCom m and obj ect in t his sam ple has a Schem aPat h propert y. You assign t he propert y a st ring value t hat point s t o t he locat ion of t he annot at ed schem a. Next , t he Com m andType propert y designat es an XPat h quer y. The Com m andTex t propert y specifies t he quer y as an XPat h expression. Aside from t hese differ ences, all t he ot her changes ar e cosm et ic or at least not essent ial. The m ost im port ant of t hese m inor changes is t he pat h and filenam e for persist ing t he XML docum ent cr eat ed by t he SqlXm lCom m and obj ect . For t his
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sam ple, t he file s nam e is m y ShippersFROMANNOTATEDSCHEMA. xm l. By using a different nam e from t he preceding sam ple, y ou can m ore r eadily cont rast t he out put from t he t w o sam ples. Sub RunAnnotatedSchemaXPathQuery() Specify connection string for SqlXmlCommand. Dim cnn1String As String = _ "Provider=SQLOLEDB;Server=(local);" & _ "database=Northwind;" & _ "Integrated Security=SSPI" Specify connection for cmd1 SqlXmlCommand object. Dim cmd1 As SqlXmlCommand = _ New Microsoft.Data.SqlXml.SqlXmlCommand(cnn1String) Specify root tag for XML file. cmd1.RootTag = "Shippers" Designate an XPath query based on an annotated schema using the Shipper element in the Shippers1.xsd schema one directory above .exe file for application. cmd1.SchemaPath = ("..\Shippers1.xsd") cmd1.CommandType = SqlXmlCommandType.XPath cmd1.CommandText = "Shipper" Name the file for the XML result set, then instantiate a Stream object for the file s contents. Dim myXMLfile As String = _ "c:\SQL Server Development with VBDotNet\" & _ "12\myShippersFROMANNOTATEDSCHEMA.xml" Dim myFileStream As New System.IO.FileStream _ (myXMLfile, System.IO.FileMode.Create) Execute cmd1 and store the result set in the stream before closing the stream file. cmd1.ExecuteToStream(myFileStream) myFileStream.Close() End Sub Figur e 12- 2 shows t he XML docum ent sav ed by t he RunAnnot at edSchem aXPat hQuer y pr ocedur e. Not ice t hat t his docum ent has a different form at from t he one based on t he SELECT st at em ent w it h a FOR XML clause. I n fact , t he docum ent in Figur e 12- 2 has t he form at specified by t he preceding annot at ed schem a. You can adj ust t he schem a t o show j ust a subset of colum n values or ar range t he elem ent s differ ent ly or swit ch t he colum n values t hat appear as elem ent s vs. at t r ibut es. Ther efor e, using an XPat h quer y wit h an annot at ed schem a enables you t o specify t he form at for t he XML docum ent . Figu re 1 2 - 2 . Th e ou t pu t fr om t h e Ru n An n ot at e dSch e m aX Pat h Qu er y p roce du re open e d in a br ow se r from W in dow s Ex plor e r .
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