convert string to barcode c# Ru nn in g a n X Pa t h Qu e r y for An y X M L D ocu m e n t in VB.NET

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Ru nn in g a n X Pa t h Qu e r y for An y X M L D ocu m e n t
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The preceding sam ple is int er est ing because it shows a pract ical use for an XML docum ent based on a dat abase obj ect . Nam ely , you can pr ocess dat abase cont ent s t hrough a local copy in an XML docum ent . However, t he pr eceding sect ion s sam ple w or ks for j ust one XML docum ent . To m ake t he sam ple w or k for anot her XML docum ent , you need t o get int o t he int ernals of t he pr ocedur e and change specific lines of code. This is awkward. I t would be m uch bet t er if you could pass param et ers t hat define t he XML docum ent and quer y and t hen hav e a procedur e generat e an appropriat e result set . The sam ple in t his sect ion dem onst rat es how t o code such a solut ion. I developed t w o code blocks t o call t he sam ple procedur e for t his sect ion. The first code block execut es t he sam e XPat h query against t he sam e XML docum ent as in t he preceding sam ple. What s different is t hat t his sam ple passes t he SQL for defining t he docum ent and t he XPat h query for t he docum ent as argum ent s. Unsurpr isingly, t his invocat ion of t he pr ocedur e for t his sect ion generat es t he sam e r esult s as for t he sam ple in t he pr eceding sect ion. The second code block uses t he sam e pr ocedur e t o generat e a differ ent XPat h quer y against a different XML docum ent . Alt hough it is clear ly not surpr ising t hat we obt ain a differ ent result fr om t he sam e pr ocedur e, t he sam ple is int erest ing because it dem onst rat es how easy it is t o accom plish t his feat w it h an XPat h quer y and an XML docum ent bot h of which ar e unfam iliar t o t ypical Visual Basic dev elopers. The first code block cont ains t hr ee lines of code. The first line assigns a value t o t he st rSQL st ring var iable. This m em ory var iable cont ains t he SQL st ring for a result set t hat t he RunXPat hQuer yWit hAr gum ent For AnyLocalDocum ent procedur e uses t o populat e an XML docum ent . The second line of code assigns a value t o t he st rXPat h st ring v ariable, w hich st ores an XPat h query for t he XML docum ent generat ed by t he procedure. I t is t he applicat ion of t he XPat h query t o t he XML docum ent t hat generat es a result set , such as t he one in Figure 12- 5. The final line of code in t he first code block passes t he st rSQL and st r XPat h v ariables t o t he RunXPat hQuery Wit hArgum ent For AnyLocalDocum ent pr ocedur e. The pr ocedur e, in t ur n, ex ecut es t he SQL query and populat es an XML docum ent w it h t he result set . I n t he end, t he procedure list s a set of nodes in t he Out put w indow . Dim strSQL As String = "SELECT * FROM Products FOR XML AUTO" Dim strXPath As String = "//Products[@Discontinued=1]" RunXPathQueryWithArgumentForAnyLocalDocument(strSQL, strXPath) The second block of code for invoking t he RunXPat hQuery Wit hArgum ent For AnyLocalDocum ent pr ocedur e appear s next . Because t his block uses t he sam e var iable nam es as t he preceding block , y ou should always com m ent out at least one of t hese blocks in order t o av oid a com pilat ion er ror for declar ing t he sam e var iable m or e t han once; t his com m ent
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assum es bot h code blocks reside wit hin t he sam e pr ocedur e as t hey do in t he m ain procedur e for Module1 of t he XMLSam ples solut ion. This second block defines a different XML docum ent t hr ough it s SQL st ring t han t he first code block. The XML docum ent fr om t he first block cont ains a list of pr oduct s, but t he second block s XML docum ent is a list of em ploy ees. I n addit ion, t he XPat h query changes t o ext ract a specific subset of em ployees. The m ain point of t he second block is t hat y ou can use any SQL st ring t o generat e an XML docum ent and t hen query it w it h an appr opriat e XPat h query. You achiev e t his flex ibilit y w it hout hav ing t o m odify any int er nal code in t he RunXPat hQuery Wit hArgum ent For AnyLocalDocum ent pr ocedur e. You could r eadily ext end t his applicat ion by offering a list of pr ev iously form ulat ed SQL query st at em ent s w it h m at ching XPat h query st at em ent s. I n t his way , y ou can dram at ically sim plify t he t ask of generat ing and using XML docum ent s for t hose j ust gaining fam iliarit y wit h t he t opic. Dim strSQL As String = "SELECT * FROM Employees FOR XML AUTO" Dim strXPath As String = "//Employees[@EmployeeID>4]" RunXPathQueryWithArgumentForAnyLocalDocument(strSQL, strXPath ) Despit e it s subst ant ially enhanced generalit y, t he pr ocedur e in t his sect ion is near ly ident ical t o t he one in t he preceding sect ion. The m aj or m odificat ion is t he using of t he t wo passed st ring var iables st r SQL and st r XPat h. I n addit ion, t his procedur e changes t he assignm ent for t he Root Tag so t hat it isn t t ied t o a list of product s but rat her t o a list of any t ype of ent it y. The applicat ion alway s uses a connect ion t o t he Nort hwind dat abase, but you can param et er ize t he connect ion st ring as well t o obt ain ev en gr eat er generalit y. At t he v er y least , y ou will want t o change t he connect ion st ring so t hat it refers t o a dat abase in your applicat ion. Sub RunXPathQueryWithArgumentForAnyLocalDocument( _ ByVal strSQL As String, ByVal strXPath As String) 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) Designate data source for cmd1 with result set in XML format. cmd1.RootTag = "MyRoot" cmd1.CommandType = SqlXmlCommandType.Sql cmd1.CommandText = strSQL Pass the cmd1 result set to an XmlReader, and load an XmlDocument with the contents of the XmlReader. Dim xrd1 As System.Xml.XmlReader = cmd1.ExecuteXmlReader() Dim xdc1 As New System.Xml.XmlDocument() xdc1.Load(xrd1) Close the reader. xrd1.Close() Specify an XPath query based on the strXPath argument for nodes from the xdc1 XmlDocument. Dim xnl1 As System.Xml.XmlNodeList = _ xdc1.DocumentElement. _ SelectNodes(strXPath) Declare a node and a string.
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Dim xnd1 As System.Xml.XmlNode Dim str1 As String For each node display a message with the contents, including the XML tags. Debug.WriteLine( _ "The record count for the result set is " & _ xnl1.Count.ToString & ".") For Each xnd1 In xnl1 str1 = xnd1.OuterXml Debug.WriteLine(str1) Next End Sub
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