Oracle Client Software 7.3
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I have an old 32-bit software program that connects to an Oracle database but only works with the Microsoft ODBC driver for Oracle. It does not work with the more up-to-date native Oracle ODBC driver. I have installed the Oracle Instant Client (32-bit and 64-bit versions on my 64-bit Win 7 PC), each into different ORACLEHOME directories. However when I try to connect via ODBC with Microsoft's driver, I get the error: 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. I can connect to the database fine with Oracle's ODBC driver so the install seems fine, but alas this program will only work with Microsoft's ODBC driver. Since the Microsoft ODBC driver is apparently unable to find the Oracle Instant Client install, how should I tell it where to look?
Turns out this is quite simple. You have to set the PATH environment variable to point to the ORACLEHOME that you want to use. For me, I edited the PATH to add;C: oracle instantclient32121 on the end and it worked perfectly, no restart needed.
Oracle Client Software 8.1.7 Or Greater
Oracle Products
For clarification, the C: oracle instantclient32121 directory I specified contains files like oci.dll and ociw32.dll and belonged to the 32-bit Instant Client install. I guess it doesn't matter for 64-bit, since there is no Microsoft ODBC 64-bit client.