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t he deploy ed Web service s .disco file, such as ht t p: / / m yproduct ionserver/ DeployedNt hRoot Serv ice/ Service1.disco, in t he Address box of t he Add Web Reference dialog. Thr ough UDDI , y ou ll be able t o navigat e gr aphically t o publicly av ailable Web services. Finally y ou can com plet e t he deployed solut ion by changing t he proxy v ar iable, xw s1, in t he client applicat ion so t hat t he v ariable point s t o t he newly added Web reference t o t he client solut ion. The sam ple client applicat ion, XMLWebServiceClient s, has t he code behind Form 1 m odified t o accom plish t his. All you have t o do is com m ent out t he Dim st at em ent inst ant iat ing a Web reference for t he t est solut ion ( XMLWebSer viceClient s.localhost .Serv ice1) and uncom m ent t he Dim st at em ent for t he Web reference point ing t o t he deploy ed solut ion ( XMLWebSer viceClient s.localhost 1.Ser vice1) . The following lines show how t he m odule- lev el Dim st at em ent s should look in t he Form 1 m odule for t he deploy ed solut ion. This adj ust m ent t o t he m odule behind Form 1 in t he client applicat ion com plet es t he pr ocess of deploying t he solut ion so t hat t he client applicat ion can access t he deploy ed solut ion. Use the Service1 Web service in the TestNthRootService f older. Dim xws1 As New XMLWebServiceClients.localhost.Service1( ) New proxy variable pointing at deployed Web service. Dim xws1 As New XMLWebServiceClients.localhost1.Service1( )
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This sect ion dem onst rat es how t o ret ur n values from a t able in a dat abase. The sam ple Web serv ice in t his sect ion per form s a r ow count and r et ur ns t he colum n values for t he fir st colum n in any dat abase t able on t he local SQL Serv er inst ance. The client applicat ion can specify bot h t he dat abase and t able nam es t o det er m ine t he ret urn v alues from Web m et hods. I n addit ion, t he sam ple client applicat ion allow s users t o select a specific r ow for which t o show a colum n value. This second level of select ion occurs wit hin t he client applicat ion inst ead of forcing anot her call t o t he Web service. This sect ion doesn t address deploy m ent explicit ly because t he process is ident ical t o t hat covered in t he preceding sect ion. Cou n t ing a n d Re t u r n ing Row s fr om An y Ta ble in Any D a t a ba se
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The Web service for t his sect ion sam ple works for any t able in any dat abase on a dat abase server. You need t o specify t wo input par am et ers t o t he Web serv ice. One is t he dat abase nam e. The ot her is t he nam e of a t able wit hin t he dat abase. The Web ser vice offers t wo Web m et hods. One m et hod ret urns a count of t he num ber of r ows in a t able. The ot her m et hod r et urns all t he v alues for t he first colum n in t he t able. The following list ing shows t he m odule for t he Web service; I inser t ed a com m ent t o indicat e wher e t he Web Serv ices Designer Generat ed Code goes. The applicat ion exist s in t he TableProcessor Web services proj ect . I t est ed t he applicat ion fr om Ser vice1.asm x in t he TableProcessor folder of t he wwwroot subdir ect ory wit hin t he I net pub direct or y on m y local Web server . As wit h t he preceding sam ple, a second folder is available in t he sam e place t hat m y sy st em saves Visual St udio proj ect s. This folder also has t he nam e TableProcessor, and it cont ains t he TableProcessor.sln file for Visual St udio t o open t he proj ect . As you t est t his applicat ion, y ou will need sim ilar proj ect folders on your sy st em . The WebService at t ribut e for t he class specifies ht t p: / / MyService/ Xm lWebServices/ as t he nam espace for t he Web serv ice. I f y ou have anot her Web service wit h t he sam e nam espace t hat y ou are using concurrent ly , y ou need t o r enam e t he nam espace for one of t hese Web ser vices. The infor m al descript ion for t he Web ser vice is A Table Processing Service. Recall t hat t his nam e appear s on t he t est int er face for t he ser vice. As a consequence, t he infor m al descript ion also appears in t he .wsdl file defining t he Web ser vice. Aft er t he Ser vice1 class declar at ion, t he list ing declares a pair of m odule- lev el v ar iables. The applicat ion uses m odule- lev el declarat ions because t hese variables appear in t wo or m or e procedures. I n one sense, t he heart of t he applicat ion is t he set of t he nex t t wo funct ion pr ocedures. Each of t hese procedures RowCount and Colum nValues im plem ent s a Web m et hod nam ed aft er t he funct ion procedure. A slight ly longer sum m ary of each m et hod s purpose appear s in t he Descript ion pr opert y for t he WebMet hod at t r ibut e associat ed wit h each funct ion procedure. As wit h t he infor m al Web serv ice, you can find t he funct ion nam es and t heir infor m al descript ions in t he .wsdl file for t he Web serv ice. The RowCount procedure ret urns a single value j ust lik e t he preceding sam ple, except t his one is based on a dat abase. The Colum nValues procedure ret urns a collect ion of v alues. This r epr esent s an opport unit y t o par se t he collect ion of values if you want t o display t hem individually or select a specific value from t he collect ion. The client applicat ion for t his Web serv ice dem onst r at es one approach t o t his t ask .
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Bot h funct ion pr ocedures im plem ent ing Web m et hods are j ust shells for t he ReadRows sub procedur e. The ReadRows procedure t ak es as st ring argum ent s t he dat abase nam e and t able nam e t hat it m ust process. Then t he procedur e m akes a connect ion t o t he dat abase, point s a SqlDat aReader obj ect at t he t able, and passes t hrough t he t able s rows t o ext ract values from t he first colum n and count t he num ber of r ows. Aft er going t hr ough all r ows and st oring t he colum n values in a local st ring variable, t he procedur e insert s ( t o clar ify t he m eaning of t he following dat a) a shor t st ring const ant at t he beginning of t he st ring variable cont aining colum n values. The procedure concludes by closing bot h t he SqlDat aReader and Connect ion obj ect s. Option Strict On Imports System.Web.Services <WebService(Namespace:="http://MyService/XmlWebServices/" , _ Description:="A Table Processing Service.")> _ Public Class Service1 Inherits System.Web.Services.WebService Web Services Designer Generated Code Declare module-level variables. Dim strValues As String Dim intCount As Integer Mark the function as a Web method. <WebMethod(Description:="Return row count.")> _ Public Function RowCount(ByVal adbname As String, _ ByVal atablename As String) As Integer Pass database and table names to ReadRows procedure. ReadRows(adbname, atablename) Return count of rows in table. Return intCount End Function Mark the function as a Web method. <WebMethod(Description:="Return column values.")> _ Public Function ColumnValues(ByVal adbname As String, _ ByVal atablename As String) As String Pass database and table names to ReadRows procedure. ReadRows(adbname, atablename). Return values from first column in the table. Return strValues
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End Function Sub ReadRows(ByVal adbname As String, _ ByVal atablename As String) Open a connection to the database named as an argument. Dim strSQL As String = "Data Source=(local);" & _ "Integrated Security=SSPI;" & _ "Initial Catalog=" & adbname Dim cnn1 As System.Data.SqlClient.SqlConnection = New _ System.Data.SqlClient.SqlConnection(strSQL) cnn1.Open() Declare a command and assign a SQL string to it. Dim cmd1 As System.Data.SqlClient.SqlCommand = _ cnn1.CreateCommand() cmd1.CommandText = _ "SELECT * FROM " & atablename Declare a datareader and copy result set from cmd1 to drd1. Dim drd1 As System.Data.SqlClient.SqlDataReader = _ cmd1.ExecuteReader() Copy and count values in first column. Do While drd1.Read() strValues = strValues & CStr(drd1.GetValue(0)) & ", " intCount += 1 Loop strValues = "Values in column 1 are: " & strValues Close datareader and connection objects. drd1.Close() cnn1.Close() End Sub End Class Te st in g t h e W e b Se r vice in t h e Ta ble Pr oce ssor Folde r Aft er building a Web service applicat ion, you can t est it t o m ake sure it r esponds as ant icipat ed. To do t his, com pile your code and per form prelim inar y t est ing w it h t he .NET Fram ework built - in t est ing int er face. I n Solut ion Ex plorer , right - click Serv ice1.asm x.
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Select Build And Br owse. This present s a Web page wit hin Visual St udio wit h link s t o t he Web m et hods wit hin t he Web serv ice. Click t he RowCount link on t he Serv ice1 t est screen. This opens anot her dialog box wit h a pair of t ext boxes and a but t on. Ent er pubs as t he dat abase nam e in t he adbnam e t ext box . Type st ores in t he at ablenam e t ex t box. Then click I nvoke. This cr eat es a new page wit h XML r et ur ned by t he Web serv ice. ( I t is, aft er all, an XML Web service.) I f y ou have pubs inst alled on y our dat abase server and y ou didn t edit t he num ber of st or es in t he dat abase, it will ret ur n t he int eger value 6. ( See Figur e 13- 9.) You can t ell it s an int eger by t he int t ags ar ound t he num ber 6. This dat a t y pe follows fr om t he code for t he RowCount r et urn v alue in t he pr eceding sect ion. I t s significance is t hat you m ust r ecognize t he ret ur n value as an int eger in any client applicat ion t hat pr ocesses v alues ret ur ned by t he RowCount Web m et hod.
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Figu r e 1 3 - 9 . Th e X M L re t u r n e d by t h e Row Cou n t W eb m e t h od for t h e W e b ser vice in t h e Ta b le Pr oce ssor fold er w it h pubs a s t h e da t a ba se n a m e an d st ore s as t h e t a ble n a m e.
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I f you select t he t est screen for t he RowCount Web m et hod, y ou ll not ice t hat it st ill has pubs and st ores for t he dat abase and t able nam e ent ries. You can change eit her or bot h of t hese t o ret urn t he count of rows in anot her t able. Ther e ar e no special st eps for ret ur ning t he row count for a t able in anot her dat abase. For exam ple, change t he dat abase and t able nam es t o Nor t hw ind and Cust om ers. Then click I nvoke. Unless y ou added or delet ed rows in t he Cust om er s t able for t he Nort hwind dat abase, t he RowCount Web m et hod r et urns 91 as an int eger value. Aft er verify ing t he ret ur n value for t he Row Count Web m et hod for t he Cust om er s t able in t he Nort hw ind dat abase, y ou can exam ine t he out put for t he colum n values fr om t he Cust om ers t able. To do t his, first close t he window ret ur ning t he RowCount ; t his displays t he form for t he RowCount m et hod. Second go back one scr een ( for exam ple, using t he Web Nav igat e Back cont r ol on t he Visual St udio .NET Web t oolbar ) . Then click t he Colum nValues link t o display t he ent ry form for t est ing t he Colum nValues Web m et hod. Type Nor t hwind and Cust om ers in t he blank adbnam e and at ablenam e t ext boxes. Then click I nv oke. This pr esent s a com m a- separat ed list of Cust om er I D v alues from t he fir st colum n in t he Cust om ers t able. ( See Figure 13- 10.) The st ring of Cust om erI D values st ar t s wit h t he st ring ( " Values in colum n 1 are: " ) specified in t he ReadRow s funct ion wit hin t he Ser vice1.asm x file for t he Web service.
Figu r e 1 3 - 1 0 . Th e X M L r e t u rn ed b y t h e Colu m n V alu e s W e b m et h od for t h e W e b se rvice in t he Ta ble Pr oce ssor fold er w it h N or t h w ind as t h e da t ab a se n a m e a n d Cu st om e rs as t h e t a b le n a m e.
Bu ildin g a Clie n t Applica t ion Any one Web serv ice can work wit h m ult iple differ ent client applicat ions. For exam ple, j ust because t he Colum nValues m et hod for Service1 in t he TableProcessor folder ret urns all t he v alues in t he first colum n of a t able doesn t m ean t hat a client v alue has t o display all t he ret ur ned v alues. The sam ple client applicat ion in t his sect ion pr om pt s a user for which r ow t hey want from t he colum n and t hen ret ur ns t hat par t icular row fr om t he first colum n. On t he ot her hand, t he client applicat ion does r eport t he count of r ows wit hin a t able and r et urns it as an int eger v alue exact ly as specified by t he RowCount Web m et hod. Figure 13- 11 shows t he for m for t he client applicat ion. I n or der t o run t his applicat ion by st art ing t he XMLWebServiceClient s proj ect , m ak e Form 2 t he st ar t up obj ect . Recall fr om Chapt er 9 t hat you can do t his in t hr ee st eps. Fir st right - click t he proj ect nam e in Solut ion Explorer. Second select General from Com m on Proper t ies in t he Proper t y Pages dialog box. Third use t he St art up obj ect drop- down box t o select Form 2. The client applicat ion displaying it s int er face t hr ough Form 2 has four t ex t boxes wit h corr esponding labels and t wo but t ons. Not all t ext boxes appear at t he sam e t im e. When t he for m init ially opens, j ust t he t op t wo of t he four t ex t boxes ar e visible. Aft er valid dat abase and t able nam es ar e ent ered, a click of t he Row Count but t on ret ur ns t he for m wit h t hree t ext boxes. These are t he init ial t wo t ext box es plus a new one showing t he count of rows in t he t able. Clicking t he but t on labeled Get Colum n Value displays a prom pt asking t he user which row t o r et urn fr om t he t able s first colum n values. The I nput Box funct ion t hat produces t he prom pt ret ur ns t he default value 1 if t he user doesn t specify a row. When
For m 2 r eappears aft er t he user replies t o t he prom pt , t he form shows t he fir st t wo t ext boxes wit h t heir prior v alues as well as t he fourt h t ex t box for display ing a colum n value. The specific value in t he bot t om t ext box is t he one m at ching r ow specified by t he user s reply t o t he prom pt .
Figu re 1 3 - 1 1 . Th e clien t a pp lica t ion form for t h e Se rvice 1 W e b ser vice in t h e Ta b leProce ssor folde r .
The processing of t he r et ur n values fr om t he Colum nValues Web m et hod illust r at es a t ypical scenar io. A developer engineer s an applicat ion so t hat it can accom m odat e any of several scenarios. For exam ple, a client applicat ion m akes a select ion from t he t ot al set of colum n values t o show t he colum n value for j ust one r ow inst ead of t he whole set of colum n values as in Figure 13- 10. Figur e 13- 12 t r acks t he pr ocess fr om designat ing database and t able nam es t o capt uring t he r eply t o t he I nput Box prom pt t o showing t he specific colum n value t hat a user want s t o v iew. I n t he t op window, t he user designat es t hat t hey w ant result s fr om t he Cust om ers t able in t he Nor t hwind dat abase before click ing t he but t on labeled Get Colum n Value. The m iddle window shows t he user indicat ed t hat t he applicat ion should show t he colum n value for t he fift h row. By t he way, t he prom pt adj ust s aut om at ically t o show t he m axim um num ber of r ows. The applicat ion does t his by r unning t he RowCount Web m et hod when pr ocessing a request t o show a specific r ow value fr om t he fir st colum n. The bot t om window in t he figure rev eals BERGS as t he colum n v alue for t he fift h row in t he fir st colum n. You can easily confirm t his out com e for yourself by exam ining t he out put in Figur e 13- 10, which shows all t he colum n values for t he fir st colum n in t he Cust om ers t able from t he Nor t hwind dat abase.
Figu re 1 3 - 1 2 . Th e clien t applica t ion for t h e Se rvice 1 W e b ser vice in t h e Tab le Pr oce ssor folde r de m on st ra t ing h ow it h a nd le s a re qu e st t o sh ow a pa r t icu la r colu m n va lu e from t h e first colu m n of t h e Cu st om e rs t a ble in t h e N or t h w in d d at a ba se .
The following list ing shows t he code behind For m 2 t hat m anages t he behavior of t he client applicat ion for t he Web service in t he TableProcessor folder . The list ing st ar t s wit h t he inst ant iat ion of a
m odule- lev el v ar iable, x ws1, for t he proxy Web serv ice. Not ice how Visual Basic .NET sy st em at ically nam es t he second- level reference in t he pr oxy obj ect . The proxy for t he first Web service uses localhost as it s second nam e. The proxy for t he deployed ver sion used localhost 1 as it s second nam e. This pr oxy variable, which is t he t hird one in t he chapt er, has localhost 2 as it s second nam e. I n all t hr ee cases, t he fir st nam e for a pr oxy denot es t he client applicat ion s pr oj ect nam ely, XMLWebSer viceClient s. Also, t he nam e for t he prox y obj ect in each case r efer s t o t he .asm x file in t he Web service, which has t he nam e Service1 in all t hr ee inst ances. The body of t he list ing includes t hr ee event pr ocedures. One is a form Load event procedure. This ev ent pr ocedure m erely readies t he init ial look of t he for m . I n part icular , it m akes t he t hird and fourt h t ex t boxes, along wit h t heir m at ching labels, invisible. The applicat ion also includes a Click event procedure for each but t on on t he form . These event procedur es inv oke t he RowCount and Colum nValues Web m et hods as well as processing t heir r et urn values. As you can see, t he x ws1 pr oxy variable appear s in bot h Click event procedur es, which is why t he list ing st art s by inst ant iat ing t he v ariable at t he m odule level. The But t on1_Click event procedur e inv ok es t he RowCount Web m et hod and displays it s result in Text Box3. This pr ocedure act ually st ar t s by m ak ing sure Text Box4 and it s m at ching label are invisible. These t wo cont rols are for displaying a colum n v alue and labeling t he ret ur n value, but a click of t he Row Count but t on ( But t on1) doesn t show any colum n values. Nex t t he procedure copies t he Tex t pr opert y v alues of Text Box1 and Text Box2 t o m em ory var iables in t he client applicat ion. These variables st ore t he nam e of t he dat abase and t he t able for t he Web serv ice t o ex am ine. Aft er saving t he local m em or y v ariables, t he pr ocedure uses t hem as argum ent s while invoking t he RowCount Web m et hod. The argum ent s specify for which t able in which dat abase t o ret ur n a r ow count . The final group of lines in t he ev ent procedur e m akes t he t ext box and label ( Text Box 3 and Label3) for t he row count value visible on t he for m . The procedur e s final line passes t he convert ed value t ype of t he r et urn v alue fr om t he RowCount Web m et hod t o t he Tex t propert y of Tex t Box3. The Click event pr ocedure for But t on2 is slight ly m or e sophist icat ed t han t he one for But t on1. Ther e ar e t hree r easons for t his. First , t he But t on2_Click event procedure invokes t wo Web m et hods inst ead of one. Second, t he Click event pr ocedure for But t on2 pr esent s a prom pt t o gat her user feedback. Third, t he event procedur e st ores t he ret ur n value from t he Colum nValues Web m et hod as an ar ray and t hen uses t he r eply t o t he pr om pt t o pick a value from t he arr ay and display it on t he form .
Like t he event procedure for But t on1, t he But t on2_Click event procedure st art s by m aking a t ex t box and label inv isible. I n t his case, t he t ext box and label are for t he Row Count Web m et hod s ret ur n value, which a click t o But t on2 doesn t show. Just because t he procedur e doesn t direct ly show t he ret ur n value fr om t he RowCount Web m et hod doesn t m ean t he Web m et hod is unused in t he procedur e. On t he cont rary, t he RowCount Web m et hod s r et ur n value is used early and oft en t hroughout t he procedure. I n fact , t he nex t t hree lines save argum ent s for t he Web m et hod, inv oke it , and save t he ret ur n value in a m em ory v ariable, m y RowCount . Next t he procedure pr om pt s t he user for which r ow in t he first colum n t o show a colum n v alue. The procedur e uses an I nput Box funct ion for t his w it h t he default value 1. Aft er obt aining a reply t o t he I nput Box funct ion prom pt , t he procedure concludes it s dat a input phase fr om t he user. All t he dat a it needs is in m em or y or available via a Web m et hod call. Next t he procedure invok es t he Colum nValues Web m et hod and saves it s result as a st r ing. Then t he procedur e st rips off t he leading st r ing ( "Values in column 1 are: " ) fr om t he r et urn value and sav es t he result ing st ring ( st r1) . This leav es st r 1 wit h j ust t he colum n values from t he t able nam ed in Tex t Box2. Per haps t he m ost int er est ing aspect of t he procedure is t he par sing of st r 1 t o ext ract indiv idual colum n v alues t hat go int o cells in t he m yVect or arr ay . The arr ay is dim ensioned based on t he row count fr om t he t able nam ed in Text Box 2. This v alue is av ailable v ia a m em ory v ar iable ( m yRow Count ) from t he inv ocat ion of t he RowCount Web m et hod. The pr ocedure t hen opens a loop t hat it erat es t hrough t he colum n values in st r1. On each pass t hr ough t he loop, t he code reads t he fir st colum n v alue in st r1, which is a subst r ing up t o but not including t he fir st com m a. I t t hen sav es t his value in t he fir st em pt y cell in t he m y Vect or arr ay and r em oves t he value, it s t r ailing com m a, and t he blank space aft er t he com m a fr om t he st r1 v ar iable. Ther efore, successiv e passes always have a fr esh v alue as t he first colum n v alue in st r 1. The pr ocedure concludes by m aking Text Box4 wit h it s m at ching label v isible and by select ing a cell fr om t he m yVect or arr ay t o show based on t he user s response t o t he I nput Box funct ion prom pt . Use cabinc_NthRoot Web Service. Dim xws1 As New XMLWebServiceClients.localhost2.Service1( ) Private Sub Form2_Load(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles MyBase.Load Hide RowCount text box and label. TextBox3.Visible = False Label3.Visible = False
Hide ColumnValue text box and label. TextBox4.Visible = False Label4.Visible = False End Sub Private Sub Button1_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button1.Click Hide ColumnValue text box and label. Label4.Visible = False TextBox4.Visible = False Pass database name and table name from text boxes on the form to the RowCount Web method. Dim adbname As String = TextBox1.Text Dim atablename As String = TextBox2.Text Dim myRowCount As Integer = _ xws1.RowCount(adbname, atablename) Make the RowCount label and text box visible before populating the text box with a value from the RowCount Web method. Label3.Visible = True TextBox3.Visible = True TextBox3.Text = myRowCount.ToString End Sub Private Sub Button2_Click(ByVal sender As System.Object, _ ByVal e As System.EventArgs) Handles Button2.Click Hide RowCount text box and label. Label3.Visible = False TextBox3.Visible = False Pass database name and table name from text boxes on the form to the RowCount Web method. Dim adbname As String = TextBox1.Text Dim atablename As String = TextBox2.Text Dim myRowCount As Integer = _ xws1.RowCount(adbname, atablename) Print out the maximum number of rows as part of a pr ompt for a selected row from a user. Dim strInputMsg = _ "What row to max. of " & myRowCount.ToString & " "
Dim intReturnedRow As Integer = _ CInt(InputBox(strInputMsg, "", "1")) Pass database name and table name memory values to t he ColumnValues Web method and strip off leading string for column values. Dim myColumnValues As String = _ xws1.ColumnValues(adbname, atablename) Dim intToColon = InStr(myColumnValues, ":") Dim str1 = Mid(myColumnValues, intToColon + 2, _ Len(myColumnValues)) Dimension array and integer variable for loop. Dim myVector(myRowCount - 1) As String Dim intRow As Integer Pass string of column values to an array. For intRow = 0 To myRowCount - 1 myVector(intRow) = _ str1.substring(0, InStr(str1, ",") - 1) str1 = Mid(str1, InStr(str1, ",") + 2, Len(str1)) Next Make ColumnValue label and text box visible before passing array value corresponding to user selection in the text box. Label4.Visible = True TextBox4.Visible = True TextBox4.Text = myVector(intReturnedRow - 1) End Sub
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