Hi,
Not sure why this hasn't appeared... anyhoo....
I've hit a bit of a problem with a jQuery and a webservice. The webservice is in VB.NET and it's been quite a while since I last did anything in VB or a webservice.
Thing is, I'm not sure if the problem is in the query or in the code. All I get when I run is a button (which is correct) and after I click it, I get an error 500 - which doesn't really help.
The query (below) has security issues which I'm completely aware of - but as it's for my own use, that's ok - I can tidy that up at some point if I decide to use it. -
<html xmlns="http://www.w3.org/1999/xhtml">
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<head runat="server">
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<title>A quick and dirty hack</title>
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<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js" type="text/javascript"></script>
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<script type="text/javascript">
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$(document).ready(function() {
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$("#btnMore").click(function() {
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$.ajax({
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type:"POST",
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contentType: "application/json; charset=utf-8",
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url: "WebService1.asmx/GetData",
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data: "{'localhost', 'root', '', 'Table1', {'SELECT','Name','where','age > 25','and','hometown == Liverpool'}, {'','','',''}",
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success: onSuccess,
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error: onError
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});
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});
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});
-
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function onSuccess(result)
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{
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$("#datalist").empty()
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var strings = result.d;
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for (var i = 0; i < strings.length; ++i)
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$("#datalist").append("<li>" + strings[i] + "</li>");
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}
-
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function onError(result)
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{
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alert(result.status + ": " + result.statusText);
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}
-
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</script>
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</head>
-
I have a feeling that it's down to what I'm passing into the webservice rather than the webservice -
<System.Web.Script.Services.ScriptService()> _
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<System.Web.Services.WebService(Namespace:="http://tempuri.org/")> _
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<System.Web.Services.WebServiceBinding(ConformsTo:=WsiProfiles.BasicProfile1_1)> _
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<ToolboxItem(False)> _
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Public Class WebService1
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Inherits System.Web.Services.WebService
-
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<WebMethod()> _
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Public Function GetData(ByVal server As String, ByVal uid As String, ByVal pw As String, _
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ByVal db As String, ByVal cmds As ArrayList, ByVal tbl As ArrayList) As DataSet
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Dim connection As SqlConnection
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Dim data As New DataSet("GetDataSet")
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Dim constr As String = "server=" + server + "; uid=" + uid + "; pwd=" + pw + "; database=" + db
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Try
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connection = New SqlConnection(constr)
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connection.Open()
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For i = 0 To cmds.Count
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If (Not (cmds(i).ToString()).StartsWith(("SELECT" Or "Select"))) Then
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Throw MySQLException("The SQL command must start with SELECT or Select")
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End If
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Dim command As New SqlCommand
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command.Connection = connection
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command.CommandText = cmds(i).ToString()
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Dim dataadapter As New SqlDataAdapter
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dataadapter.SelectCommand = command
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dataadapter.TableMappings.Add("Table", tbl(i).ToString())
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dataadapter.Fill(data)
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Return data
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Next
-
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Catch ex As System.Data.SqlClient.SqlException
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Throw
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End Try
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connection.Close()
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End Function
-
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Private Function MySQLException(ByVal p1 As String) As Exception
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Throw New NotImplementedException
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End Function
-
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End Class
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Am I correct in thinking that I'm just passing things in correctly or is there something else I've missed?
Thanks
Paul
6  2180 
A 500 error messages means that there was a general error that occurred on the server while processing. If you have access to the Windows Event logs on the server where your application is hosted I would check them for anything that might explain what is causing the 500 error.
-Frinny
It's being done through VS2010 via localhost. Not sure where to look for it under Win7 (normally I use Linux)
Go to - Control Panel
- Administrative Tools
- Event Viewer
This will let you view the Windows Event logs. Expand the "Windows Logs" tree and go through the Event Logs under that tree to view any events or errors that Windows has encountered. Look for anything related to IIS, or ASP.NET or your application...
-Frinny
Just curious, why aren't you using the built in debugging capabilities of Visual Studio 2010?
I'm new to VS2010. If I set a breakpoint in the VB it comes up with a page that says Webservice1 and shows the method available. If I click on the method is comes up with that "the test form is only available for methods with primitive types as parameters" followed by some soap 1.1 stuff
By the looks of it, passing ArrayLists are a no-no, but looking at http://www.c-sharpcorner.com/UploadF...ebService.aspx, arraylists are fine to pass.
HELP - which one is right or is it a language specific problem? (the above is in C#, mine is in VB)
Not really used to VS2010, but it's getting me further.
If I put a breakpoint in the VB I get a screen saying WebService1 which means (to me) that it's sending to VB ok. If I click on the GetData method, it comes up with a message that only primitives are allowed to be passed in, so I'm guessing that means ArrayLists are right out.
However, googling around has brought me to http://www.c-sharpcorner.com/UploadF...ebService.aspx which suggests that passing ArrayLists to a webservice is ok.
Have I hit a VB specific problem or am I missing something?
Paul
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