How to use native XML driver in CR XI 2 (to avoid "Database Logon Failed")?

Question

Hello,
I have a simple scenario:
The Java Part:
-Our Java application creates a pair of files: one XML and one XSD.
-Both files are uploaded to an ASP.NET page along with a report (RPT file - based on the same XSD and some generated XML using the native XML driver) for rendering a PDF.
The ASP.NET(VB) Part:
-Reads and stores 3 files (XML, XSD and RPT) to temporary files.
-Loads the report
-Updates connection attributes ("Local Schema File" and "Local XML File") to point to those temporary files.
-Exports the report to a PDF which is returned to the Java part.
What are the correct steps to accomplish this? I keep on getting "Database logon failed." exceptions.
My code looks like this:
Dim doc As ReportDocument = New ReportDocument
doc.Load(rptPath)
Dim attr As DbConnectionAttributes
attr = New DbConnectionAttributes()
attr.Collection.Set("Local Schema File", xsdPath)
attr.Collection.Set("Local XML File", xmlPath)
Dim conn As IConnectionInfo
conn = doc.DataSourceConnections.Item(0)
conn.Attributes.Collection.LookupNameValuePair("QE_LogonProperties").Value = attr
conn.Attributes.Collection.LookupNameValuePair("QE_ServerDescription").Value = xmlPath & " " & xsdPath
conn.Attributes.Collection.LookupNameValuePair("QE_SQLDB").Value = False
doc.ExportToHttpResponse(ExportFormatType.PortableDocFormat, Response, False, "")
Thank you for any help,
David
(Crystal Reports XI Rel 2. SP4, .NET assembly 11.5.3700)

Answer 1

Hi,
When you get a database logon prompt like this it normally means the dataset you're creating at runtime does not match the schema that the report was designed with.
The simplest thing to do is write out the dataset to XML with Schema after you fill the dataset. Once you've written out the dataset you can go back to the report in Crystal Reports itself and try to point the report to the XML file directly. If you get any errors this confirms that the dataset does not match what the report is expecting.
Try it, address any differences, and you should be all set.
Sincerely,
Amit