[Mono-list] Mono and Oracle 9i will not work

Hannes Osius Hannes Osius <h_osius@web.de>
Wed, 2 Apr 2003 16:23:57 +0200

Hello mono-list,

I tried to connect to an Oracle 9i and I get this Error-Message:

Unhandled Exception: System.NullReferenceException: A null value was found where an object instance was required
in <0x00020> 00 System.Data.OracleClient.Oci.OciServerHandle:Attach (string,System.Data.OracleClient.Oci.OciErrorHandle)
in <0x0043a> 00 System.Data.OracleClient.Oci.OciGlue:CreateConnection (System.Data.OracleClient.OracleConnectionInfo)
in <0x0008e> 00 System.Data.OracleClient.OracleConnection:Open ()
in <0x000d5> 00 .MainClass:OracleOnlyClient (string,string)
in <0x000c7> 00 .MainClass:Main (string[])

the code:
 using System;
 using System.Data;
 using System.Data.OracleClient;
 public class MainClass
        public static void OracleOnlyClient(string  connectionString, string sqlcmd){
                OracleConnection dbcon = new OracleConnection(connectionString);
                OracleCommand dbcmd = new OracleCommand(sqlcmd,dbcon);
                OracleDataReader myReader = dbcmd.ExecuteReader();
                Console.WriteLine("OracleClient with OracleDataReader");
                while (myReader.Read()) {
                        object KundenID      = myReader["KUNDENID"];
                        object Vorname       = myReader["VORNAME"];
                        object Nachname      = myReader["NACHNAME"];
                        object Telefonnummer = myReader["TELEFONNUMMER"];
                        Console.WriteLine ("KundenID: {0}  Vorname: {1} Nachname: {2} Telefonnummer: {3} ", KundenID.ToString(), Vorname.ToString(), Nachname.ToString(), Telefonnummer.ToString());
                //clean up;
                myReader.Close ();
                myReader = null;
                dbcmd.CommandText = sqlcmd;
                dbcmd.ExecuteNonQuery ();
                dbcmd.Dispose ();
                dbcmd = null;
                dbcon.Close ();
                dbcon = null;

        public static void Main (string[] args)
                string DataSource = "SWT02";
                string UserID     = "MY_ACC";
                string Password   = "MY_PASS";
                string sqlcmd = "SELECT * FROM KUNDE";
                string connectionStringOracle =
                "Data Source=" + DataSource + ";" +
                "User ID="     + UserID     + ";" +
                "Password="    + Password   + ";";


On the PC is the Oracle Client 9i install in /opt/oracle
I have checkout mono and msc from the CVS and installed it.

add this in my .bashrc to get the Oracle Client work
export ORACLE_HOME=/opt/oracle
export ORACLE_USER=oracle

compiled my DBtest.cs with
mcs DBtest.cs -r System.Data -r System.Data.OracleClient

and run it with:
mono DBtest.exe

then I get the Error Message.

Did I forget something ?
or will the System.Data.OracleClient not work with an Oracle Client 9i?

Best regards,
 Hannes                          mailto:h_osius@web.de