Can i use a environment variable inside a *.sql file?

Hello,
I want to create a external table.
So i am using the command
create or replace directory abc as 'C:\folder'.... inside a sql file.
Now i want the path "C:\folder" to be dynamic as i am using this path in many other places also inside the sql file.So i thought to create a environment variable and put this value there.I tried using as %PATH% but it gives error..... where %PATH%=C:\folder.
Can i use a environment variable inside a *.sql file?
But how to do that or is there any other way.
Thanks
Swapna
Edited by: user11018268 on Feb 19, 2010 1:03 AM

user11018268 wrote:
Actually what i want is the path "C:\folder" is not fixed it can be anything which i may not know the user may decide it later. Not supported. A directory object refers to a specific physical location (directory/folder) on a file system. Not a path.
You can work around it by (creating and) using a function (running under a super user schema with authid definer privs). The caller (e.g. schema scott ) calls it with a physical path. E.g. GetDirectoryObject( 'C:\folder\2010\feb\week4' ).
This function determines if there is an existing directory object for the path. If not, it uses a wildcard search to determine if there are any directory objects for parents in the path (e.g. for C:\folder\2010\feb or C:\folder\2010 or C:\folder ).
If it finds a directory object, it interrogates the data dictionary to determine if the caller, schema scott for example, has read/write access on that directory object. If it has, it creates a new directory object and grants the caller read/write access to it. The function then returns the name of the directory object to the caller.
The caller thus do not deal directly with directory objects. The function returns the object name given a physical path as input. Also, only a single base directory needs to be created (e.g. for C:\folder ) and access granted to the schema on it. Any sub-directory in that base directory can now be dynamically accessed by the schema.

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