[Mono-list] Help with ADO.NET Oracle client

Tim Coleman tim@timcoleman.com
03 Apr 2003 02:06:14 -0500

On Tue, 2003-04-01 at 23:59, David Pickens wrote: 
> Let me say first that I'm new to mono, and relatively new to C# (moving 
> from C++), so the following problems could be a result of my 
> inexperience, but I can't seem to get the sample code from go-mono.org 
> to work, nor does my attempt in my own code to open the database 
> connection work.  (However, using sqlsharp, /Provider Oracle, and a 
> valid connection string *does* work on the system, and I do have oracle 
> installed and working correctly on the system in question.)
> I've corrected the missing casting to strings in the demo code, but when 
> it does compile successfully, and the connection string is valid I get:
> Unhandled Exception: System.NullReferenceException: A null value was 
> found where an object instance was required
> in <0x00018> 00 System.Data.OracleClient.Oci.OciServerHandle:Attach ()
> in <0x00470> 00 System.Data.OracleClient.Oci.OciGlue:CreateConnection 
> (System.Data.OracleClient.OracleConnectionInfo)
> in <0x0008e> 00 System.Data.OracleClient.OracleConnection:Open ()
> in <0x00095> 00 .Test:Main (string[])
> My own connection code, in an ASP.NET page used by mod_mono/apache2 returns:
> System.MissingMethodException: A missing method exception has occurred.
> in <0x00046> 06 
> System.Data.OracleClient.Oci.OciEnvironmentHandle:OCIEnvCreate 
> (intptr&,System.Data.OracleClient.Oci.OciEnvironmentMode,intptr,intptr,intptr,intptr,int,intptr)
> in <0x00063> 00 System.Data.OracleClient.Oci.OciEnvironmentHandle:.ctor 
> (System.Data.OracleClient.Oci.OciEnvironmentMode)
> in <0x0002c> 00 System.Data.OracleClient.Oci.OciGlue:CreateConnection 
> (System.Data.OracleClient.OracleConnectionInfo)
> in <0x0008e> 00 System.Data.OracleClient.OracleConnection:Open ()
> in <0x00080> 00 GSNB.GSNBDataAccess:.ctor ()
> The version of mono is 0.23 (debs).
> Any help will be appreciated!


Since the Oracle provider *does* work for you with SQL#, and it seems in
the first example that the error is occuring in
OciServerHandle.Attach(), I think that there may be a problem with your
connection string.  If you could send me the details, perhaps I could
check it out.

In the second example, it almost seems that it can't find the Oracle
client libraries that you have installed.  Not knowing much about
mod_mono, I can't really say why that may be, but you might want to
check out the LD_LIBRARY_PATH or somesuch for the apache user.


Tim Coleman <tim@timcoleman.com>                       [43.43 N 80.45 W]
BMath, Honours Combinatorics and Optimization, University of Waterloo
Software Developer, Global Services, Open Text Corporation
"Under capitalism, man exploits man.  Under communism, it's just the
 opposite." -- J.K. Galbraith