Connection to Oracle - Help

Hi

I'm new in ASP.NET

I have TNSNAMES.ORA with all information I need
I have the path of TNS_ADMIN correctely pointing to TNSNAMES.ORA folder

This is true because I have no problems conecting to Oracle using VB 6 or
VBA

With ASP.NET I get always TNS error

Did I miss something ? what's worng ? do I need a Project Reference like VB
6 ?

thank you very much for any help

My sample code is as follow :

Imports System
Imports System.Data
Imports System.Data.OleDb

Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
Dim sConnectionString As String = "Provider=MSDAORA.1;User
ID=v0efalm;password=cila01;Data Source=CEN;Persist Security Info=False"
Dim mySelectQuery As String = "SELECT sysdate FROM dual"
Dim myConnection As New OleDbConnection(sConnectionString)
Dim myCommand As New OleDbCommand(mySelectQuery, myConnection)



'Set the parameter value.
'myCommand.Parameters.Add("@p1", OleDbType.Char, 5).Value = "Test%"

'Open connection to Oracle database.
myConnection.Open()

'Populate the DataReader.
Dim myReader As OleDbDataReader = myCommand.ExecuteReader()
Dim RecordCount As Integer
Try
While myReader.Read()
RecordCount = RecordCount + 1
Console.Write(myReader.GetString(0).ToString())
End While
If RecordCount = 0 Then
Console.Write("No data returned")
Else
Console.Write("Number of records returned: " & RecordCount)
End If
Catch ex As Exception
Console.Write(ex.ToString())
Finally

'Close all objects.
myReader.Close()
myConnection.Close()
End Try
End Sub

sreejith
Tue Aug 30 17:30:14 CDT 2005

can u please post error message .. it could be the usual directory
permission issue

this article should help

http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q255084

Paul
Wed Aug 31 09:34:36 CDT 2005

On Tue, 30 Aug 2005 22:48:39 +0100, "Fernando" <xxx@hotmail.com> wrote:

¤ Hi
¤
¤ I'm new in ASP.NET
¤
¤ I have TNSNAMES.ORA with all information I need
¤ I have the path of TNS_ADMIN correctely pointing to TNSNAMES.ORA folder
¤
¤ This is true because I have no problems conecting to Oracle using VB 6 or
¤ VBA
¤
¤ With ASP.NET I get always TNS error
¤

Without knowing the exact error message I'm going to guess that it's a permissions problem. See if
the following helps:

Problem Description
-------------------

When running an application using the Oracle9i Release 2 (9.2.0.1.0) install
of client software and that attempts to connect to an Oracle database with the
Authenticated User privilege (such as when you use Microsoft's Internet
Information Server (IIS)) through any of the following programmatic interfaces

1. Oracle Provider for OLE DB
2. Microsoft OLE DB Provider for Oracle
3. Oracle ODBC Driver
4. Microsoft ODBC for Oracle
5. Oracle Objects for OLE (OO4O)
6. Microsoft .NET Framework Data Provider for Oracle


you may receive one of the following errors:


(1) Oracle Provider for OLE DB

(a) Error Type: Microsoft OLE DB Service Components (0x80070005)

Access is denied.


(b) OraOLEDB.Oracle Provider is not registered on the local machine


(2) Microsoft OLE DB Provider for Oracle

(a) Error Type: Microsoft OLE DB Provider for Oracle (0x80004005)

Oracle client and networking components were not found. These
components are supplied by Oracle Corporation and are part of the
Oracle Version 7.3.3 or later client software installation. Provider
is unable to function until these components are installed.


(b) Error Type: Microsoft OLE DB Provider for Oracle (0x80004005)

Oracle error occurred, but error message could not be retrieved
from Oracle.


(3) Oracle ODBC Driver

(a) Error Type: Microsoft OLE DB Provider for ODBC Drivers (0x80004005)

Specified driver could not be loaded due to system error 5 (Oracle
in OraHome92).


(4) Microsoft ODBC for Oracle

(a) The Oracle(tm) client and networking components were not found.
These components are supplied by Oracle Corporation and are part
of the Oracle Version 7.3 (or greater) client software installation.

You will be unable to use this driver until these components have
been installed.


(b) Error number: -2147467259

Error Description: [Microsoft][ODBC Driver Manager] Driver's
SQLAllocHandle on SQL_HANDLE_ENV failed


(5) Oracle Objects for OLE

(a) while using a GLOBAL.ASA file

Error Type: Active Server Pages (0x0)

An error occurred while creating object 'OraSession'.


(b) not using a GLOBAL.ASA file

Error Type: Microsoft VBScript runtime (0x800A0046)

Permission denied: 'CreateObject'


(6) Microsoft .NET Framework Data Provider for Oracle

(a) System.DllNotFoundException: Unable to load DLL (oci.dll).
at System.Data.OracleClient.DBObjectPool.GetObject(Boolean&
isInTransaction)
at System.Data.OracleClient.OracleConnectionPoolManager.
GetPooledConnection(String encryptedConnectionString,
OracleConnectionString options, Boolean& isInTransaction)
at System.Data.OracleClient.OracleConnection.OpenInternal
(OracleConnectionString parsedConnectionString, Object transact)
at System.Data.OracleClient.OracleConnection.Open()
at WCWSItemAvailability.ETAAvailability.SingleAvailability(String
ItemNumber, String BusinessUnit, Int32 OrderQty, Int32&
AvailableQty, Int32& OnHandQty, String& ETADate, Int32& Error)
at WCWSItemAvailability.ETAAvailability.XMLAvailability(String
XMLInput)


(7) Other miscellaneous errors

(a) The Specified Module Could Not Be Found

(b) ORA-00604: error occurred at recursive SQL level 1
ORA-12705: invalid or unknown NLS parameter value specified

(c) Unable to load DLL (OraOps9.dll):
...
[DllNotFoundException: Unable to load DLL (OraOps9.dll).]

(d) System Error 998 trying to run ASP page


Solution Description
--------------------

Oracle 9.2 Client software requires that you give the Authenticated User
privilege to the Oracle Home by following these steps:

1. Log on to Windows as a user with Administrator privileges.

2. Launch Windows Explorer from the Start Menu and navigate to the
ORACLE_HOME folder. This is typically the "Ora92" folder under the
"Oracle" folder (i.e. D:\Oracle\Ora92).

3. Right-click on the ORACLE_HOME folder and choose the "Properties" option
from the drop down list. A "Properties" window should appear.

4. Click on the "Security" tab of the "Properties" window.

5. Click on "Authenticated Users" item in the "Name" list (on Windows XP
the "Name" list is called "Group or user names").

6. Uncheck the "Read and Execute" box in the "Permissions" list under the
"Allow" column (on Windows XP the "Permissions" list is called
"Permissions for Authenticated Users").

7. Re-check the "Read and Execute" box under the "Allow" column (this is
the box you just unchecked).

8. Click the "Advanced" button and in the "Permission Entries" list make
sure you see the "Authenticated Users" listed there with:

Permission = Read & Execute
Apply To = This folder, subfolders and files

If this is NOT the case, edit that line and make sure the "Apply onto"
drop-down box is set to "This folder, subfolders and files". This
should already be set properly but it is important that you verify this.

9. Click the "Ok" button until you close out all of the security properties
windows. The cursor may present the hour glass for a few seconds as it
applies the permissions you just changed to all subfolders and files.

10. Reboot your computer to assure that these changes have taken effect.


Re-execute the application and it should now work.


Explanation
-----------

If you install Oracle9i Release 2 (9.2.0.1.0) on a computer running Windows
with an NTFS partition, the contents of ORACLE_HOME directory will not be
visible to users who are authenticated on that machine. These permissions
were not set properly when the software was installed.

Applications that were working fine with previous versions of Oracle software
will stop working when they upgrade to Oracle 9.2.

NOTE: The application will continue to work if the user has logged onto the
machine as an Administrator.

Any application that is using the Authenticated User privilege will not work.
A notable example would be IIS which might service some of the requests based
on the Authenticated User privileges.

To demonstrate the problem in further detail, you can log on to the operating
system as an authenticated machine user. You won't be able browse the contents
of the ORACLE_HOME directory demonstrating your inability to load any Oracle DLLs
or make a connection.


Additional Information
----------------------

The above error messages may not only be encountered when using Oracle 9.2
client software but may also exists when running into general permissions
issues using third party products on a Windows platform.


Paul
~~~~
Microsoft MVP (Visual Basic)