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As I m ent ioned, m any Visual Basic .NET developer s m ight find it m ore convenient t o enable dat a m anipulat ion t hr ough Dat aSet obj ect s t han by direct ly coding DiffGr am s or Updat egr am s. This book s sam ple files include an addit ional sam ple pr ocedure, List AndEdit Wit hDat aset , t o fur t her illust r at e t he flexibilit y and ease of t his approach. For t he sake of brevit y , t he procedure s list ing doesn t appear in t he book . Usin g D iffGr a m s on t h e W e b W it hou t Vir t ua l D ir e ct or ie s
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One of t he best feat ur es about t he preceding sam ple is how robust it is. For exam ple, v ery near ly t he ident ical code works in an ASP.NET applicat ion. Furt herm or e, t hat ASP.NET applicat ion perm it s updat es t o t he Web w it hout t he necessit y of a v irt ual dir ect ory for a dat abase. This sim plifies adm inist rat ion of your Web solut ions. The follow ing five st eps build an ASP.NET Web Applicat ion solut ion nam ed XMLWebSam ple. These st eps adapt t he sam ple from t he preceding sect ion t o run in an ASP.NET solut ion.
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1. St art a new ASP.NET solut ion nam ed XMLWebSam ple, and add a r efer ence t o t he Micr osoft .Dat a.SqlXm l nam espace as described ear lier in t his chapt er . 2. Select t he default WebForm 1.aspx file in Design view , and open t he m odule behind t he Web page by r ight - clicking t he page and choosing View Code. At t he t op of t he m odule for t he page, insert I m port s Micr osoft .Dat a.SqlXm l. 3. Copy t he code from t he Populat eModifyUpdat eWit hDiffGram procedure in t he preceding solut ion t o t he Page_Load ev ent for t he XMLWebSam ple solut ion. 4. Creat e in t he r oot Web folder of t he XMLWebSolut ion a schem a j ust lik e Em ploy eesFirst Last Nam es.xsd. You can use t he XML Designer for t his t ask as described ear lier in t he chapt er. ( I t s probably easiest t o open t he schem a in XML Source view and r eplace t he ex ist ing XML wit h t he XML from t he Em ployeesFirst Last Nam es.xsd in t his book s sam ple files.) Nam e t he schem a Em ployeesFirst Last Nam es.xsd. 5. Change t he set t ing for t he Schem aPat h pr opert y set t ing of t he SqlXm lCom m and obj ect in t he Page_Load event code fr om ".. \ Em ploy eesFirst Last Nam es.xsd" t o MapPat h( " Em ployeesFir st Last Nam es.xsd" ) . Aft er com plet ing t he abov e st eps, y ou can r ight - click t he WebForm 1.aspx page in t he Solut ion Explor er w indow and choose Build And Browse. This pr ocess will set t he First Nam e field for t he r ow in t he Em ploy ees t able wit h t he Em ploy eeI D value 1 t o Nancie. You can rest ore t he or iginal first nam e by changing Nancie t o Nancy in t he Page_Load ev ent procedur e and choosing Build And Browse a second t im e. For your easy r eference, t he Page_Load ev ent procedur e list ing appears her e. The t wo lines t hat changed from t he Populat eModify Updat eWit hDiffGram pr ocedur e appear in bold. The im port ant point t o grasp is t hat alt hough t he follow ing list ing is for ASP.NET, it w or ks near ly ident ically t o t he prior Windows applicat ion solut ion. The MapPat h funct ion ret urns t he full pat h t o a file t hat serv es as it s argum ent . This Web t echnique enables dev elopers t o r efer ence t he pat h t o a file wit hout explicit ly including it in t heir applicat ion. I n addit ion, t he MapPat h funct ion im pr oves your code s port abilit y because t he funct ion dynam ically com put es t he pat h t o t he file ev en if y ou change t he folder for t he solut ion. Private Sub Page_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Put user code to initialize the page here. Specify connection for cmd1 SqlXmlCommand object; connection specification must include provider designation (sqloledb). Dim cmd1 As New SqlXmlCommand("Provider=sqloledb;" & _ "Data Source=(local);" & _ "Initial Catalog=northwind;Integrated Security=SSPI") Specify SQLXmlCommand to return first and last names based on an XPath query. cmd1.RootTag = "ROOT" cmd1.CommandText = "Emp" cmd1.CommandType = SqlXmlCommandType.XPath cmd1.SchemaPath = MapPath("EmployeesFirstLastNames.xsd") Instantiate a SqlXmlAdapter object using the SqlXmlCommand object. Dim dap1 As SqlXmlAdapter dap1 = New SqlXmlAdapter(cmd1) Instantiate a new DataSet object (das1) and
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fill via dap1. Dim das1 As DataSet = New DataSet() dap1.Fill(das1) Edit the value in the first row s first column of Emp data table. das1.Tables("Emp").Rows(0)(0) = "Nancie" Write the XML as a DiffGram before committing change to server. Dim str1 As String = _ "c:\SQL Server Development with VBDotNet\" & _ "12\myDiffGram.xml" Dim myFileStream As New System.IO.FileStream _ (str1, System.IO.FileMode.Create) Dim xtw1 As New System.Xml.XmlTextWriter _ (myFileStream, System.Text.Encoding.Unicode) das1.WriteXml(xtw1, XmlWriteMode.DiffGram) Perform update to server-based data source for the das1 data set; don t specify a specific 'data table within the data set. dap1.Update(das1) End Sub
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