Th e D a t a Ada pt e r Cla ss in Visual Basic .NET

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The Dat aAdapt er class ser ves as a bridge for connect ing a SQL Serv er dat a source t o a Dat aSet class inst ance. You can use a Dat aAdapt er obj ect t o init ially populat e a dat a set , and you can also use a Dat aAdapt er obj ect t o sy nchronize a local dat a set w it h m at ching dat a in a SQL Ser v er inst ance. The Dat aAdapt er class is fundam ent al t o ADO.NET, and it is a m aj or design feat ur e enabling t he high scalabilit y of ADO.NET applicat ions. The Dat aSet class, t oget her w it h it s hierarchically dependent obj ect s, repr esent s a disconnect ed dat a source. Ther efor e, t he Dat aAdapt er class doesn t requir e a const ant connect ion t o a rem ot e dat a source. Dat aAdapt er obj ect s can link t o SQL Serv er dat a sources only w hen necessary, fr eeing t he ser ver in int er vening per iods t o serv ice ot her client s. I nst ant iat e Dat aAdapt er obj ect s wit h t he SQL Ser ver dat a provider as inst ances of t he SqlDat aAdapt er class. You m ust use a SqlDat aAdapt er obj ect in concert w it h a SqlConnect ion obj ect . The SqlConnect ion obj ect t hat a SqlDat aAdapt er obj ect references is t he conduit t he Dat aAdapt er obj ect uses t o link a local dat a source, represent ed by a Dat aSet obj ect , t o a rem ot e dat a source on a server. You can inst ant iat e a SqlDat aAdapt er obj ect w it h an em bedded T- SQL st at em ent or w it h a reference t o a SqlCom m and obj ect . The T- SQL st at em ent , w het her it is em bedded or available in a SqlCom m and obj ect , det erm ines which r em ot e dat abase obj ect s get t apped t o populat e a local dat a set . Use t he SqlDat aAdapt er Fill m et hod t o populat e a local dat a set . Before you can inv oke t he m et hod, t he SqlDat aAdapt er m ust have an open connect ion t o a rem ot e dat a source. Aft er init ially inv ok ing t he Fill m et hod, your applicat ion can close t he connect ion and work wit h t he local dat a set version. The SqlDat aAdapt er class facilit at es dat a m anipulat ion for SQL Serv er obj ect s t hr ough it s Updat e m et hod and it s relat ed Updat eCom m and, I nsert Com m and, and Delet eCom m and pr opert ies. By specify ing t hese t hree propert ies, y ou can designat e dat a m anipulat ion inst r uct ions, such as T- SQL sy nt ax for an updat e, an insert , or a delet e t ask. You can specify t he T- SQL propert y dir ect ly as part of t he propert y specificat ion or indir ect ly by refer encing a st ored procedur e. I n eit her case, you w ill m ap colum ns in t he local dat a set t o colum ns in a rem ot e dat a source by adding par am et ers t o t he com m ands designat ed by t he Updat eCom m and, I nser t Com m and, and Delet eCom m and Dat aAdapt er propert ies. I nvok e t he Updat e m et hod t o t ransfer changes t o a rem ot e dat a source from a local dat a set . The Updat e m et hod in concert wit h t he Com m and obj ect s Updat eCom m and, I nser t Com m and, and Delet eCom m and acco- m m odat es updat e, insert , and delet e dat a m anipulat ion t asks. The SqlDat aAdapt er obj ect support s opt im ist ic concur r ency bet w een t he rem ot e dat a source and t he local dat a set . This follows from t he disconnect ed st at us of t he local dat a set from t he r em ot e dat a source. I n fact , ADO.NET doesn t enable pessim ist ic concurrency . Keyset cursors and connect ed recordset s ar en t a part of ADO.NET as t hey are of ADO. While opt im ist ic concur rency helps t o enhance scalabilit y, it requir es an ext ra m easure of care t o m at ch t he changes in a local
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dat a set back t o t he r em ot e serv er. For exam ple, at t em pt ing t o updat e a row in a rem ot e dat a source fr om a local dat a set t hat changed since y ou last populat ed t he dat a set raises an opt im ist ic concurr ency v iolat ion. This v iolat ion raises an except ion.
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