Upda t in g a W eb Ser vice w it h t h e W e b Se rvice s Toolkit in Visual Basic .NET

Making DataMatrix in Visual Basic .NET Upda t in g a W eb Ser vice w it h t h e W e b Se rvice s Toolkit

Upda t in g a W eb Ser vice w it h t h e W e b Se rvice s Toolkit
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Aft er adding cust om dat abase obj ect s t o a dat abase, you can expose t he obj ect s as Web m et hods t hrough a vir t ual direct ory point ing t o t he dat abase. The v irt ual direct or y m ust have a soap vir t ual nam e, such as SoapFor 13, which is t he vir t ual soap nam e for t he Chapt er 13 v irt ual dir ect or y. I f you have an ex ist ing soap nam e,
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you can edit it according t o t he inst r uct ions in t his sect ion. I f y ou don t already have a soap nam e for a vir t ual direct or y, you can use t he inst ruct ions in t he Building a Web Ser vice in an I I S Vir t ual Dir ect ory sect ion t o cr eat e a new soap v irt ual nam e. Begin by exposing t he t wo new dat abase obj ect s as Web m et hods by double- clicking t he Chapt er13 v ir t ual direct or y in t he I I S Virt ual Dir ect ory Managem ent ut ilit y . On t he Vir t ual Nam es t ab of t he Chapt er 13 Pr opert ies dialog box, highlight SoapFor13 and click Configure. This opens t he Soap Virt ual Nam e Configur at ion dialog box . Click t he Br owse but t on ( ) t o select udpList OfCat egory Nam es. Select Single Dat aset for t he out put form at . Nam e t he Web m et hod udpList OfCat egoryNam esAsDat aset . Figure 13- 17 shows t he Soap Vir t ual Nam e Configur at ion dialog box j ust before saving t he set t ings for t he udpList OfCat egoryNam esAsDat aset Web m et hod. Click Save t o save t he specificat ion for t he Web m et hod. You can follow t he sam e gener al approach t o exposing t he udfPr oduct sI nACat egory user- defined funct ion as a Web m et hod. Assign udfProduct sI nACat egor yAsDat aset as it s Web m et hod nam e.
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Figu r e 1 3 - 1 7 . Th e Soa p V ir t u a l N a m e Con figu ra t ion se t t in g s for t h e u dp List OfCat e gory N a m e sAsD a t a se t W e b m e t h od.
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Popu la t ing a D a t a Gr id a n d a List Box w it h a W e b M e t h od Using t he revised Web serv ice gives you a chance t o explor e m ore ways of how t o t ap Web serv ices fr om wit hin Visual Basic .NET applicat ions. Befor e you can t ak e advant age of t he rev isions, you need t o refr esh t he Web reference connect ing t he XMLWebSer viceClient s pr oj ect t o t he Web serv ice. Cur iously, you do t his by follow ing t he sam e st eps as for adding a new Web refer ence. St art t he refr esh process by choosing Add Web Reference from t he Proj ect m enu wit hin t he XMLWebServ iceClient s pr oj ect . I n t he Add Web Reference dialog box t hat opens, ent er ht t p: / / localhost / Chapt er 13/ SoapFor13 wsdl in t he Address box. Then press Ent er and click Add Reference. This opens t he dialog box shown in Figure 13- 18. Click Yes t o updat e t he Web r eference. Wit hout t hese st eps, y our client applicat ion won t be able t o use t he Web m et hods for t he udpList OfCat egoryNam es and udfProduct sI nACat egor y dat abase obj ect s added previously .
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Figu r e 1 3 - 1 8 . Dialog box for u pd at in g a W e b r e fe r en ce , d isplaye d w h e n you st a rt t o a dd a n e w W eb r efe r en ce t o a n u pda t e d W eb ser vice . Click Ye s t o u pda t e t h e e xist in g W e b re fe re n ce w it h ou t ad ding a n e w on e .
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Now t hat t he XMLWebServ iceClient s proj ect has an updat ed Web reference, we can put t he new Web m et hods t o use. The udpList OfCat egory Nam es st ored pr ocedure is sim ilar t o t he Ten Most Ex pensive Product s st ored procedur e in t hat neit her pr ocedure accept s a param et er . However, t he Web m et hods for t he dat abase obj ect s ar e dist inct in ways t hat affect t he synt ax for using t hem . Recall t hat t he Ten_Most _Expensiv e_Product s Web m et hod for m at s it s out put as XML obj ect s. On t he ot her hand, t he udpList OfCat egory Nam esAsDat aset Web m et hod for m at s it s r esult as a single dat a set . By specify ing it s out put as a single dat a set , you k now precisely what t he for m at of t he r et urn fr om t he Web m et hod w ill be. ( There s no chance of a SqlMessage obj ect in t he out put st r eam associat ed wit h t he Web m et hod.) Therefore, t he sy nt ax for reading t he out put can be m ore st r aight forward. When you have only one result set from a dat abase obj ect , t he Single Dat aset for m at is a great out put form at for sim plify ing t he processing of y our client applicat ion. You can get a hands- on feel for using t he udpList OfCat egory Nam esAsDat aset Web m et hod by adding a new
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form wit h Dat aGrid and List Box cont r ols. For m 5 in Figure 13- 19 shows t he basic design for t he sam ple. The Design view shows t wo cont rols on a Window s form . The left cont rol is an em pt y Dat aGrid cont rol; it s Propert ies window shows t he cont rol s nam e as Dat aGrid1. The ot her cont r ol on t he for m shows it s nam e as List Box 1. By m ak ing For m 5 t he st ar t up obj ect for t he XMLWebSer viceClient s pr oj ect , you can invok e t he form s Load event procedure by st art ing t he proj ect . I n t his ev ent procedure, you can load dat a from t he SoapFor 13 Web serv ice int o bot h cont rols. The following list ing shows t he for m Load event procedure for For m 5. I t st art s by inst ant iat ing a pr oxy variable, xws1, for t he SoapFor 13 Web serv ice, which is denot ed by t he Web reference nam ed localhost 3 in t he client applicat ion. Because I updat ed t he Web reference as descr ibed previously, t his sam ple in t he XMLWebSer viceClient s pr oj ect can invoke t he udpList OfCat egory Nam esAsDat aset Web m et hod. This Web m et hod s definit ion ret ur ns a single dat a set . When r et ur ning a result set fr om a st ored pr ocedure as a single dat a set , you m ust designat e an int eger r et urnvalue argum ent as y ou invoke t he Web m et hod. This ret urnv alue ar gum ent m ak es av ailable t he r et urn code for a st or ed pr ocedur e; synt ax convent ions require t he r et ur nvalue argum ent even when t he st or ed procedur e has no ret urn code. Chapt er 4 refers t o ret urn codes from st or ed procedur es as r et urn st at us values as it illust r at es t heir use.
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Figu r e 1 3 - 1 9 . For m 5 con t ain s a p a ir of con t r ols t h a t t h e code be h in d t h e for m w ill popu la t e by in vok in g t h e udp List OfCa t e gor yN a m e sAsD a t a se t W eb m e t h od .
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