Issues when trying to connect to Oracle database

Hi
We have set up a linked server in SQL Server to connect to an Oracle database. We are using SQL Server 2008 R2 Enterprise (64 bit) on Windows Server 2008 and Oracle client 11g 11.02.00.01 connecting to Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production using UTF8.
Most tables are selectable without error, however, we got this error message for some:
Msg 7347, Level 16, State 1, Line 1
OLE DB provider 'OraOLEDB.Oracle' for linked server 'OurLinkedServer' returned data that does not match expected data length for column '[OraOLEDB.Oracle].Ourfieldname'. The (maximum) expected data length is 6, while the returned data length is 2.
This error message refers to a column of type char(3)
Will the characterset cause this error (I’ve read that SQL Server doesn’t support UTF8)?
If not, is there some other resolution that anyone can think of?
Any suggestions are greatly appreciated.
Thanks a lot!
Tom

Thank You for replying, Justin!
Yes, I can connect successfully to the database through other tools - at the moment I tried SQL*Plus, Net8 Easy Config and Schema Manager.
The Oracle client in the NT machine is 8.0.5.0.0. And unfortunately I do not know anything about the Oracle installation on this machine and at the moment I don't have that person near me too whom to ask also. But I think the installation was ok, because the connection through ODBC was working before the DB upgrade as far as I understood (sorry, again at the moment I don't know what was the previous version of DB. I will ask that information as soon as possible).
The main problem that bothers me at the moment is that I can't install 8.1.* series OraODBC driver with 8.0.5.0.0 Oracle Installer. I managed to install 8.0.6.6.0 version of the driver, but not the newer ones. As far as I've understood I have to upgrade the whole Oracle in the NT machine to upgrade that installer. Am I correct?
Regards,
Madis Priilinn

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Hi,
Version 10204
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Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
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You told us.
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I ask some questions, you set alias for listener port (no default) + local_listener parameter, don't you?
If you did....
Please check by .....
lsnrctl status
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Let me show my example:
About 1522 (no default port)
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Copyright (c) 1991, 2007, Oracle. All rights reserved.
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user10832104 wrote:
All,
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on this line of code:
Class.forName("oracle.jdbc.driver.OracleDriver");
I've used this before in a different program on this machine (that still works) with no problem. I'm just trying to write some code that queries my Oracle SQL database. Any idea what's wrong?
Thank you.

A couple of points for those finding this thread on a search (I assume the OP has moved on).
classes12.jar is sometimes found as .zip and needs renaming to .jar.
The ojdbc4 version is more up to date.
Drivers are needed on the class path only at run time, not when you compile the code.

Dreamweaver CS6 - Get error when trying to connect to database..

When trying to connect to a database in Dreamweaver CS6 - I keep getting this error... 'An unknown error has occurred'. I've exhausted all google hits.. and have tried EVERY combination possible during the past 4 years... SOS - please help me.. Thanks!

Moving it yet again to the correct Dreamweaver forum: Developing server-side applications in Dreamweaver.
Usually, "an unknown error has occurred" means that there's something wrong with your testing server definition. Have you followed the instructions here: http://www.adobe.com/devnet/dreamweaver/articles/setup_php.html ?

Connecting to Oracle Database - Not Connecting

I am new to JAVA and for the first time I am trying to connect to an Oracle data using JAVA. Well, I am getting an error when trying to connect to the database. What I can see the error has to do that the strings passed to make the databases connection are NULL. So, an error (see error below).
Question
How come the "connection" varriable is NULL?
It appears that the hold "try" session is not executed. Is this session out of order?
ERROR
Could not find the database connection: null
Database connection before call: null
Exception in thread "main" java.lang.NullPointerException
     at TestOCIApp.main(TestOCIApp.java:39)
========= JAVA Program START =======
//import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class TestOCIApp {
public static void main(String args[]) throws ClassNotFoundException,
SQLException {
     Connection connection = null;
     try {
     // Load the JDBC driver
     String driverName = "oracle.jdbc.driver.OracleDriver";
     Class.forName(driverName);
     // Create a connection to the CCMS PROD database
     String serverName = "192.168.2.144";
     String portNumber = "1521";
     String sid = "op01ccdb01";
     String url = "jdbc:oracle:thin:@" + serverName + ":" + portNumber + ":" + sid;
     String username = "user-id";
     String password = "password";
     connection = DriverManager.getConnection(url, username, password);
     System.out.println("connection value: " + connection);
     } catch (ClassNotFoundException e) {
     // Could not find the database driver
          System.out.println("Could not find the database connection: " + connection);
     } catch (SQLException e) {
     // Could not connect to the database
          System.out.println("Could not connect to the database connection: " + connection);
     System.out.println("Database connection before call: " + connection);
     Statement stmt = connection.createStatement();
ResultSet rset = stmt.executeQuery("select 'Hello OCI driver tester '||USER||'!' result from dual");
while (rset.next())
System.out.println(rset.getString(1));
rset.close();
stmt.close();
connection.close();
========= JAVA Program END =========

The try section is being executed just fine but only partially because you get the exception "ClassNotFoundException", which means it cannot load the Oracle driver class (so it fails at the line where it says):
Class.forName(driverName);You catch this exception, and then just print a line "Could not find the database connection: null". Then you let the code continue, obviously without having initialized your variables yet.
I would recommend rewriting those catch blocks to throw a new RuntimeException so the code will not continue further when an error is detected in the try, or to not catch them not all if you donot want to handle them there in a proper fashion.
As to your problem, you probably have not added the ojdbc14.jar to your project, and that's why it cannot find the OracleDriver class.
Finally, try to add {noformat}{noformat} around your code when you post code. It makes it a lot more readable.

Help needed in connecting to oracle database in unity

Hi,
I have been trying to connect to Oracle database in my codes. I have tried using OdbcConnection and OleDbconnection. But both did not allowed me to connect to the database. The database, testDb, can be accessed using SQL plus as well as the SQL developer. I even tested the connection successful using ODBC data source administrator.
the following is my code for the connection string:
OdbcConnection connectionString = "Driver={Oracle ODBC Driver};Server=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP )(HOST=127.0.0.1)(PORT=1521))(CONNECT_DATA=(SID=Te stDb)));Uid=scott;Pwd=password;";
the error i got is [ODBC Driver Manager] Data Source name not found and no default driver specified.
for the driver parameter, i have tried using "Microsoft ODBC for Oracle". It gives me another error stating that the oracle and network components are not installed.
I even tried "Oracle in OraDb11g_home1" which was specified in the ODBC Data Source Administrator. The same error came out.
Below are some of my specifications:
Platform: Windows 7 64bit
Oracle: Oracle Database 11g Release 2 (64bit)
Unity: 4.1.2
Can someone please help me with this? What is it that i have done wrong?
Thanks.

1008737 wrote:
Hi,
I have been trying to connect to Oracle database in my codes. I have tried using OdbcConnection and OleDbconnection. But both did not allowed me to connect to the database. The database, testDb, can be accessed using SQL plus as well as the SQL developer. I even tested the connection successful using ODBC data source administrator.
the following is my code for the connection string:
OdbcConnection connectionString = "Driver={Oracle ODBC Driver};Server=(DESCRIPTION=(ADDRESS=(PROTOCOL=TCP )(HOST=127.0.0.1)(PORT=1521))(CONNECT_DATA=(SID=Te stDb)));Uid=scott;Pwd=password;";
whenever localhost (127.0.0.1) is used, this means that no remote client can ever connect to this system
The problem involves ODBC configuration & has nothing to do with Oracle.

Unable to connect to oracle database 10.1.0.2.0 from jdeveloper 11.1.2.1.0

Hello,
I am trying to connect to oracle database 10.1.0.2.0 from jdeveloper 11.1.2.1.0 to develop an ADF application.
But it is giving me the error
Test failed: Listener refused the connection with the following error:
ORA-12505, TNS:listener does not currently know of SID given in connect descriptor
connection type:oracle(JDBC)
Role :SYSDBA
Driver:thin
Host:localhost
JDBC port:1521
SID:webaid
I am able to connect to the database using SQL*Plus with the same credentials.
Any help is appreciated!

I take it you solved this problem, since you posted this: installing Oracle 10.1.0.2.0 (32 bit) on windows 2003 server

Issues when trying to connect to Oracle database

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