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Creator Data Matrix in VB.NET End Sub

End Sub
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Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Move to first row and populate text boxes. Session( MyRowID ) = 0 MoveToRow() End Sub Private Sub Button2_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button2.Click Move to previous row and populate text boxes. If Session( MyRowID ) > 0 Then Session( MyRowID ) -= 1 End If MoveToRow() End Sub
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Private Sub Button3_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button3.Click Move to next row and populate text boxes. If Session( MyRowID ) < _ Ds1.Tables( Products ).Rows.Count - 1 Then Session( MyRowID ) += 1 End If MoveToRow() End Sub
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Private Sub Button4_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button4.Click Move to last row and populate text boxes. Session( MyRowID ) = Ds1.Tables( Products ).Rows.Count - 1 MoveToRow() End Sub
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Your applicat ions will som et im es need t he availabilit y of cust om dat abase obj ect s. For exam ple, st or ed pr ocedur es, w hich st ore pr ecom piled, opt im ized SQL code, are great for m anaging dat a m anipulat ion t asks, such as insert ing new records
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int o a t able, and dat a definit ion t asks, such as dynam ically creat ing a new t able. I f you happen t o creat e a cust om t able for y our applicat ion, y our applicat ion can probably also benefit from one or m or e st ored procedur es perform ing dat a m anipulat ion t asks for t he t able. For exam ple, your applicat ion can pass t he st ored procedure param et ers specify ing t he colum n values for a new row, and t he st ored procedure can ex ecut e t he I NSERT I NTO st at em ent . I f your applicat ion needs t he value for a colum n w it h an I dent it y propert y cr eat ed on t he SQL Ser ver inst ance, t he st ored procedure can r et ur n it as an out put param et er . The sam ple for t his sect ion dem onst rat es t he cr eat ion of a t able and a st or ed procedur e. The sam ple is t he set up program for t he next sect ion t hat dem onst rat es how t o pr ogram dat a m anipulat ion t asks. Specifically , y ou w ill lear n how t o creat e a t able and a st or ed pr ocedur e on a SQL Serv er inst ance from an ASP.NET applicat ion. Figur e 11- 20 shows t he Web page for t he sam ple. The page s nam e is WebFr om 1.aspx, and it r esides in t he Set upForWebUpdat eSam ple proj ect . The page includes t wo but t ons and a hy per link. The but t ons have Text propert y set t ings r eflect ing t he t ext t hey show. The but t on I D propert y set t ings are But t on1 for t he t op but t on and But t on2 for t he one below it . The hy per link cont r ol has t wo design- t im e pr opert y set t ings. First , it s Text propert y specifies t he m essage t o display when rendered on a Web page. Second, t he Navigat eUr l propert y designat es t he URL of t he page t o w hich t o pass cont r ol w hen a user clicks t he hyper link. I f y ou ar e running t he applicat ion against anot her Web serv er besides t he local one on y our workst at ion, y ou w ill need t o updat e t he Nav igat eUr l pr opert y for t he hyper link cont r ol. Figu r e 1 1 - 2 0 . W eb For m 1 .a spx in t h e Set u pFor W e b Upda t e Sa m p le p roj ect .
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The sam ple s new t able is essent ially a scrat ch copy of t he Shippers t able in t he Nort hwind dat abase. By creat ing a scrat ch copy of t he t able, y ou w ill be able t o m ake changes against t he new sam ple t able w it hout dest roy ing t he or iginal dat a in t he sam ple dat abase. The But t on1_Click event pr ocedur e per form s t hr ee subt asks as it creat es a new t able nam ed ASPNETShippers. First it r em ov es t he ASPNETShippers t able if it already ex ist s in t he dat abase. Next it creat es t he ASPNETShippers t able. Third it populat es t he r ows of t he ASPNETShippers t able wit h rows from t he Shippers t able.
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The list ing t hat follows st art s by declar ing and inst ant iat ing a SqlConnect ion obj ect ( cnn1) and a SqlCom m and obj ect ( cm d1) . By declaring t he obj ect s at t he m odule lev el, I can use t hem in ev ent pr ocedur es for each but t on in Figure 1120. The But t on1_Click event pr ocedur e st art s by specifying t he connect ion st r ing for cnn1 and opening t he obj ect . Next t he pr ocedur e assigns cnn1 t o t he Connect ion pr opert y for cm d1, t he SqlCom m and obj ect . Aft er t hese pr elim inary st eps, t he procedure successively r epeat s t w o st at em ent s for assigning a Com m andText propert y t o cm d1 and t hen inv oking t he Execut eNonQuery m et hod for cm d1. Apply t he Execut eNonQuery m et hod of a SqlCom m and obj ect when t he obj ect s Com m andText propert y doesn t r et ur n a r esult set . The t hr ee Com m andText propert y set t ings r em ov e any pr ior version of t he ASPNETShippers t able, cr eat e a new ASPNETShippers t able, and populat e t he ASPNETShippers t able w it h r ows from t he Shippers t able in t he Nort hw ind dat abase. The But t on1_Click ev ent pr ocedur e concludes by closing cnn1. The logic for t he But t on2_Click ev ent procedur e follows t he sam e basic design as t hat in t he But t on1_Click ev ent pr ocedur e. The ov erall process is: ( 1) m ak e a connect ion, ( 2) run one or m ore SQL st at em ent s wit h a SqlCom m and obj ect , and ( 3) close t he connect ion. The obj ect iv e of t he But t on2_Click ev ent pr ocedur e is t o creat e a new st or ed pr ocedure nam ed udpI nsert ANew ASPNETShipper . The ev ent procedur e ex ecut es t wo SQL st at em ent s t o achiev e t his obj ect iv e. First it runs one st at em ent t o rem ov e any pr ior v ersion of t he connect ion in t he Nort hw ind dat abase. Second it runs a procedur e t o cr eat e a new version of t he udpI nsert ANew ASPNETShipper st or ed procedur e. We discussed t he logic for t his st ored procedure in Chapt er 10. That chapt er dem onst rat ed how t o cr eat e t he st ored procedure in Query Analyzer and discussed t he logic t hat t he SQL st at em ent s express. This chapt er ext ends t he earlier t r eat m ent of t he t opic by dem onst rat ing how t o creat e t he st ored procedur e program m at ically fr om w it hin ASP.NET.
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