"Failed to open the connection" problem related to multiple tables in the report?

Question

Post Author: Gadow
CA Forum: Data Connectivity and SQL
System specifics:
Web environment using ASP.Net 2.0 (from Visual Studio 2005 Professional)
Crystal Reports 2008, v. 12.0.0.549, Full
We have set up the following method for displaying reports via our website:
User is sent to a report-specific page. The user is given some filtering options specific to the report that will be viewed. When the user has specified the data filters, the user clicks a button.
The page wraps up the report parameters -- selection query, formula values, report location, the name to be displayed, etc. -- into a class which gets put into the Session object.
The page redirects to DisplayReport.aspx. ALL reports redirect to this page.
DisplayReport.aspx retrieves the report parameters from Session. A ReportDocument object is created and loaded, then set with the data from the parameters class.
A ConnectionInfo object is created and set with the relevant log on credentials. All of the reports draw from the same database, so the connection information is hard-coded as the same for all reports. The page then iterates through all of the tables in the Database.Tables collection of the ReportDocument and calls ApplyLogOnInfo to each table using the ConnectionInfo object.
The page is rendered and the user gets the filtered report.
We currently have seven reports. Five reports work fine and display the correctly filtered data with no error messages. Two reports generate a Failed to open the connection error and do not display. I have verified that the queries being sent to DisplayReport.aspx are valid, and as I said the connection information itself is hard-coded in the one page that displays the reports and this is identical to all reports.
The five reports that do work all have a single data table, either an actual database table or a single view. The two reports that do not work all have multiple tables. As far as I can tell, this is the only difference between the sets; all seven reports are based on the same DSN and I have verified the database on all of the reports. All of the reports were written using Crystal Reports 8, and all of the reports display fine in a Windows app I wrote some years ago using Crystal Reports 8. Again, the only difference between those reports that do work and those that do not is the number of tables used in the report: one table or view in the reports that display, more than one table (tables only, none use views) in the reports that do not display.
As for the code I am using, below are the relevant methods. The function MakeConnectionInfo simply parses out the components of a standard SQL connection string into a ConnectionInfo object. DisplayedReport is the ID of the CrystalReportViewer on the page.Protected Sub Page_Init(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim o As Object = Session("ReportParams")
        Dim ReportURL As String = ""
        'Verify that there is a ReportParameters object
        If o Is Nothing OrElse o.GetType IsNot GetType(ReportParameters) Then 'Redirect to the error page
            Response.Redirect("/errors/MissingReport.aspx")
        End If
        ReportParams = CType(o, ReportParameters)
        'Verify that the report exists
        ReportURL = "/Reports/ReportFiles/" + ReportParams.ReportName
        ReportPath = Server.MapPath(ReportURL)
        If Not File.Exists(ReportPath) Then
            Response.Redirect("/errors/MissingReport.aspx?Report=" + ReportParams.ReportTitle)
        End If
        InitializeReport()       
    End Sub
    Protected Sub InitializeReport()
        Dim RD As New ReportDocument
        Dim CI As ConnectionInfo = MakeConnectionInfo(DB_Bonus)
        Dim RPF As CrystalDecisions.Shared.ParameterField = Nothing
        RD.Load(ReportPath)
        If ReportParams.SelectString <> "" Then
            Dim Adapt As New SqlDataAdapter(ReportParams.SelectString, DB_Bonus)
            Dim DS As New Data.DataSet
            Adapt.Fill(DS)
            RD.SetDataSource(DS.Tables(0))
        End If
        For Each kvp As KeyValuePair(Of String, String) In ReportParams.Formulas
            Dim FFD As FormulaFieldDefinition = Nothing
            Try
                FFD = RD.DataDefinition.FormulaFields(kvp.Key)
            Catch ex As Exception
                'Do nothing
            End Try
            If FFD IsNot Nothing Then
                Select Case FFD.ValueType
                    Case FieldValueType.DateField, FieldValueType.DateTimeField
                        If IsDate(kvp.Value) Then
                            FFD.Text = String.Format("Date()", Convert.ToDateTime(kvp.Value).ToString("yyyy, MM, dd"))
                        Else
                            FFD.Text = "Date(1960, 01, 01)"
                        End If
                    Case FieldValueType.StringField
                        FFD.Text = String.Format("""""", kvp.Value)
                    Case Else
                        'For now, treat these as if they were strings. If things blow up here,
                        'we will need to add the appropriate formatting for the field type.
                        FFD.Text = String.Format("""""", kvp.Value)
                End Select
            End If
        Next
        For Each T As CrystalDecisions.CrystalReports.Engine.Table In RD.Database.Tables
            Dim TLI As TableLogOnInfo = T.LogOnInfo
            TLI.ConnectionInfo = CI
            T.ApplyLogOnInfo(TLI)
        Next
        DisplayedReport.ReportSource = RD
    End Sub
Does this approach not work with reports containing multiple tables, or is there something I'm missing? Any meaningful suggestions would be much appreciated.

Answer 1

Dear Dixit,
Please refer to the Crystal report landing page to get the details
information about the support for crystal report issues.
Please use the following thread to post your questions related to
crystal report.
SAP Business One and Crystal Reports
Regards,
Rakesh Pati
SAP Business One Forum Team.