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A DiffGram is an XML form at for r epr esent ing t he dat a values in a dat a set . The .NET Fr am ew ork aut om at ically uses t his XML form at for passing dat a bet ween a client and a SQL Ser ver dat abase. I n addit ion, y ou can use t he DiffGram form at dir ect ly w it h SQL Serv er dat abases sim ilar ly t o t he way t hat you use Updat egram s. See Chapt er 6 for exam ples of how t o use Updat egram s for dat a m anipulat ion t asks wit h a SQL Serv er 2000 dat abase as a guideline for t he k inds of ways in which y ou can use DiffGram s in Web applicat ions w it h SQL Ser ver. The follow ing code shows t he general lay out for a DiffGram . Not ice t hat it st art s wit h a declarat ion st at ing t hat it is an XML docum ent . Then it r eferences several nam espaces. For dat a m anipulat ion t asks, t he core of t he docum ent is t he Dat aI nst ance and befor e sect ions. The Dat aI nst ance sect ion denot es t he curr ent value of all rows in a dat a source. For ex am ple, t his sect ion cont ains any r ows wit h m odified colum n v alues, any insert ed r ow s, and any unm odified r ows t hat aren t delet ed fr om t he dat a source. The before sect ion conv eys t he before values for m odified rows. Delet ed r ows also appear in t he before sect ion but not in t he Dat aI nst ance sect ion. The err ors sect ion is opt ional; it cont ains err or m essages for r ows from t he Dat aI nst ance sect ion. A collect ion of at t r ibut es facilit at e select ed obj ect iv es, such as m at ching rows in t he Dat aI nst ance sect ion wit h corr esponding rows in t he before and errors sect ions as w ell as highlight ing r ows part icipat ing in insert , updat e, and delet e t asks. < xml version="1.0" > <diffgr:diffgram xmlns:msdata="urn:schemas-microsoft-com:xml-msdata" xmlns:diffgr="urn:schemas-microsoft-com:xml-diffgram-v1" xmlns:xsd="http://www.w3.org/2001/XMLSchema"> <DataInstance> </DataInstance> <diffgr:before> </diffgr:before>
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<diffgr:errors> </diffgr:errors> </diffgr:diffgram> I f you ar e a Visual Basic dev eloper m igrat ing t o t he .NET Fram ework , it m ay please y ou t o learn t hat you can benefit from DiffGram s w it hout r eally lear ning t heir form at . For exam ple, Chapt er 10 and Chapt er 11 illust rat e how t o per form dat a m anipulat ion t asks wit h Windows Form s and ASP.NET pages. I n bot h cases, ADO.NET uses DiffGram s in t he backgr ound. I find t hat underst anding t he form at and lay out of DiffGram s helps m e t o underst and t he r eason for t he sy nt ax t o designat e dat a m anipulat ion t asks in t he .NET Fram ew ork. I hav e t w o favorit e resources for dev eloping t he underst anding. The DiffGram s t opic in t he Visual St udio .NET docum ent at ion; y ou can get t o t his docum ent at ion fr om t he Windows St art m enu. The Using DiffGram s t o Modify Dat a t opic in t he Web Release 3 docum ent at ion; t his ships and inst alls w it h t he st andard v ersion of Web Release 3, and y ou can get t o t he docum ent at ion from t he Windows St art m enu.
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This chapt er includes a couple of sam ples m anipulat ing ADO. NET dat a set s wit h SQLXML m anaged classes. One of t hese sam ples highlight s how t he .NET Fram ew ork uses DiffGram s dur ing dat a m anipulat ion t asks. The second sam ple illust rat es how easy it is t o conv ert t his ADO.NET applicat ion for a Windows applicat ion t o an ASP.NET applicat ion. Bot h sam ples confirm t hat y ou can perform dat a m anipulat ion t asks t hat t ak e advant age of DiffGram s w it hout m anipulat ing t hem in your code. The fact t hat y ou can use DiffGram s w it hout act ually coding t hem raises an int erest ing quest ion about t he general role of XML for t ypical .NET dev elopers. Ther e is no doubt t hat for int erm ediat e and adv anced .NET dev elopers a firm grasp of XML will be m andat ory. How ev er , it r em ains t o be seen t o what degr ee t ypical dev elopers w ill need t o m ast er all ( or ev en m ost of) t he det ails of all XML program m ing languages. ( See t he next sect ion for an ov erv iew of som e of t hese languages.) For exam ple, it m ay be t hat m uch of t he XML synt ax is unnecessary because y ou can indirect ly m anipulat e XML w it h Visual Basic .NET or w it h SELECT st at em ent s cont aining a FOR XML clause. I f t his t rend cont inues, XML could underlie a broad range of funct ions, but t ypical dev elopers w ill be able t o use anot her, m ore fam iliar, language t o m anipulat e XML const ruct s. This is sim ilar t o t he way Visual Basic developers used t o em ploy ADO as a way t o program OLE DB dat a prov iders. On t he ot her hand, XML m ay em erge as t he m ust - k now synt ax for all real dev elopers. I ndeed, if you m easur e t he am ount of space dev ot ed t o XML in com put er publicat ions, y ou could easily com e t o t his conclusion. I am not sur e w here y ou w ill end up on t his cont inuum . Howev er , it is clear t hat not learning XML is a r isky way t o m anage y our fut ur e as a dev eloper .
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