[Mono-bugs] [Bug 430413] New: System.Data.OracleClient:

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Sat Sep 27 12:51:45 EDT 2008


           Summary: System.Data.OracleClient:
           Product: Mono: Class Libraries
           Version: 1.9
          Platform: x86
        OS/Version: RHEL 4
            Status: NEW
          Severity: Major
          Priority: P5 - None
         Component: Sys.Data
        AssignedTo: bnc-blr-team-mono at forge.provo.novell.com
        ReportedBy: ernezto at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: Development

Description of Problem:
I'm trying to retrieve a BLOB field from a table in an Oracle database, convert
it or cast it to byte[] and save it to the hard disk, the content of that field
is a a PDF document, but I'm getting an exception. This code works OK on MS
NET 1.1, I tried several ways to get the byte[] from the OracleDataReader but
always get the same exception.

Steps to reproduce the problem:

This is one of the options I use to retrieve the byte[]... if the
OracleDataReader has rows, it will have just only one... (I mean in my case)

byte[] img;
if (rd.HasRows)
        img = (byte[])rd["IMAGEN"];
        caminoImagen = directorio + idImagen.ToString() + ".pdf";
        fs = new FileStream(caminoImagen, FileMode.Create, FileAccess.Write);
        fs.Write(img, 0, img.Length);                

Actual Results:
I got an exception (check details on Additional Information), the exception is
a System.NullReferenceException: Object reference not set to an instance of an
object, BUT I debugged the method and the OracleDataReader do have value there,
an array of bytes, I don't know why the cast to byte[] don't work in Mono.

Expected Results:
Get the BLOB field value converted to byte[]...

How often does this happen? 

Additional Information:

System.NullReferenceException: Object reference not set to an instance of an
  at System.Data.OracleClient.Oci.OciLobLocator.GetLength (Boolean binary)
  at System.Data.OracleClient.OracleLob.get_Length () [0x00000] 
  at System.Data.OracleClient.OracleLob.get_Value () [0x00000] 
  at (wrapper remoting-invoke-with-check)
System.Data.OracleClient.OracleLob:get_Value ()
  at System.Data.OracleClient.OracleDataReader.GetValue (Int32 i) [0x00000] 
  at (wrapper remoting-invoke-with-check)
System.Data.OracleClient.OracleDataReader:GetValue (
  at System.Data.OracleClient.OracleDataReader.get_Item (System.String name)
  at (wrapper remoting-invoke-with-check)
System.Data.OracleClient.OracleDataReader:get_Item (
  at SARENWS.Negocio.Documento.ObtenerPDF (System.String cadenaConexion, Int32
        System.String id) [0x00000]

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