Question

How to create a VB6 / Oracle DNS-Less Connection (w/o tnsnames.ora file)

Asked by: jrram

Hello all,

I'm trying to figure out how to construct a connection string to connect to an Oracle database w/o using the DNS and also w/o relying on an entry in the tnsnames.ora file.  

I tried the tutorial at (http://www.codeproject.com/KB/vbscript/connection_string.aspx), but it isn't working for me.

The error I am receiving is:

"Run-time error '-2147467259 (80004005)

[Microsoft][ODBC driver for Oracle][Oracle]ORA-12154: TNS could not resolve the connect identifier specified"

Below are the connection strings I've tried:

Attempt #1:
 
strCon = "Driver={Microsoft ODBC for Oracle}; " & _
         "CONNECTSTRING=(DESCRIPTION=" & _
         "(ADDRESS=(PROTOCOL=TCP)" & _
         "(HOST=QA01)(PORT=1521))" & _
         "(CONNECT_DATA=(SERVICE_NAME=TEST_DATABASE))); uid=read;pwd=read;"
 
Attempt #2:
 
strCon = "Driver={Microsoft ODBC for Oracle}; " & _
         "CONNECTSTRING=(DESCRIPTION=" & _
         "(ADDRESS=(PROTOCOL=TCP)" & _
         "(HOST=QA01)(PORT=1521))" & _
         "(CONNECT_DATA=((SID=QA01)(SERVICE_NAME=TEST_DATABASE)))); uid=read;pwd=read;"

                                  
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Asked On
2009-04-27 at 12:17:39ID24359409
Tags

oracle

,

vb6

,

dns-less connection

,

tnsnames.ora

Topic

Oracle 10.x

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: ajexpertPosted on 2009-04-27 at 12:25:44ID: 24244861

This link should help you

http://www.connectionstrings.com/oracle

 

by: jrramPosted on 2009-04-27 at 12:34:48ID: 24244940

A couple of other things that will hopefully help with a solution.  I am connection using an ADODB Connection.  I'm not sure if this matters.

Dim oCon: Set oCon = CreateObject("ADODB.Connection")
Dim oRs: Set oRs = CreateObject("ADODB.Recordset")
oCon.Open strCon

Database Port: 1521
Database SID: QA01
Database Name: TEST_DATABASE
Database Password: password

>> ajexpert,

The link that you suggested only had a connection w/o tnsnames.ora for VB.NET.  I am using VB6.

 

by: ajexpertPosted on 2009-04-27 at 12:39:03ID: 24244977

You have to lookin for Oracle Provider for OLEDB while using VB6.

http://www.connectionstrings.com/oracle#16

Have you tried the following

Provider=OraOLEDB.Oracle;Data Source=(DESCRIPTION=(CID=GTU_APP)(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=myHost)(PORT=myPort)))(CONNECT_DATA=(SID=MyOracleSID)(SERVER=DEDICATED)));User Id=myUsername;Password=myPassword;

                                              
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by: jrramPosted on 2009-04-27 at 12:58:05ID: 24245119

Do you know what the CID parameter stands for?

 

by: ajexpertPosted on 2009-04-27 at 13:04:39ID: 24245168

Here is what you can try:

Open a new VB project put a ADO Data Control on the form and configure its connection string by providing the details required by this.   Chose using connection string

After this u would get the required connection string which u can use in your Adodb connection

20120131-EE-VQP-002

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