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Old February 2nd, 2010, 01:50 PM
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Default Ora-12154 problem

I have two vb.net 2.0 winforms applications, A and B. A currently talks to a remote Oracle database just fine, B needs to talk to a different database, but from the same host.

Should be easy! Update tnsnames.ora for the new db, copy some code from A to B, change the connection and query, off we go.

The problem is, I can't get B to connect to anything. It always gives the old ora-12154 error that it can't resolve the connect identifier when I try the Open() method on the OracleConnection object.

Everything else on my dev machine is able to talk to B's database: tnsping, sql plus client, even copy-and-pasting the connection string into app A and watching it successfully perform the open via VS debugging.

I've also tried copying A's connection (which I know works) to B. B fails to resolve the identifer with the same exception.

So, from my testing, I believe I've validated:
  • the tnsnames.ora file (A, tnsping, and sql plus* can connect)
  • the connection string (given the same string, A can connect)
I just can't track down whatever was done in A to make it properly talk to the remote databases (or what was done in B to disallow that).

I've also checked the path environment variable to ensure I have a path to the oracle client, and given everyone full access to all tnsnames files on my box, just in case it was a weird permission issue. Also tried re-booting, thinking maybe B had cached the tnsnames file. Nothing.

Here's how I'm trying to connect:
Dim conn As OracleConnection = Nothing
conn = New OracleConnection("Data Source=xxx.WORLD;User Id=xxx;Password=xxx;")
As I said, I've validated the connection string by copying it into A and seeing that connect properly. Now I'm just looking for ideas what might be B's problem.

Last edited by golddog; February 2nd, 2010 at 01:55 PM..
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Old February 2nd, 2010, 03:30 PM
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Not extremely familiar with this type of db instancing, but comparing your code to a technical doc from Oracle, it appears to be a syntax issue.

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Old February 4th, 2010, 03:41 PM
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Nope. Thaks for the link and idea, though. Here's what it was.

I found a link somewhere (unfortunately, I've lost track of it and can't give the person proper acknowledgement) which alluded to the OracleConnection not working if you had special characters in the path.

In Team Foundation Server, our application was housed in a folder called <appName> (<dbName>).

Created a new folder w/o parens, re-created the app over there, and voilla! the connection starts working.

Nice implementation of the Connection, and for TFS not allowing me to just rename the app's folder. Sigh.
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Old June 10th, 2010, 07:32 AM
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Default boolean type in oracle

asp.net using nhibernet connect oracle to store the boolean expression, how is it?

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