How to override to_number function?!

Hi,
I already tried to find an answer by searching this forum but without success...
My problem is, that I have a lot of mappings using the to_number() function to convert char into number. Now it turns out, that in some cases - due to the bad data qualtity - fields contain special chars e.g. 1234" Don't ask why ;) Of course the reguIar tu_number() function fails on that. Now I wrote a to_number function that handles the issue by removing all the special chars and then convert. I now want to override oracle's built-in to_number function with my own function.
Do you have any ideas how that works? As a requirement the solution should be simple... It would be an imense work to edit every mapping. I global solution is preferred. Something like a priority option, to take self written functions first or sth...
Thanks for any help!
Cheers Steffen

Hi,
you could use OMB to change all occurance of that functino in your project.
Unfortunately I know OWB allmost only from theory :-( but I remember, that you can set a context to a project or a mapping and all subsequent operations will happen within that horizont.
As far as I saw, OMB isn't to hard to use, even without days of learning, just by looking for fitting operation, but I know documentation about OMB is pretty poor, almost only syntax reference is available.
really overriding the pre_build to_number-function might be possible as sys, but I would avoid that or only do in a relly play-instance. I suppose you tried allready simply to run 'create or replace ...' ?
Thanks for your tip about number checking, but I tried allready many variations functions like that. I never can get it validated:
I have a function is_number_num, returning 1 for ok, 0 for false, which si working fine on SQL*PLUS, but when I use it splitter-condition, in this variations:
"IS_NUMBER_NUM"( GRP_IN.ANZAHL,'NLS_NUMERIC_CHARACTERS='',.''') = 1
I get: PLS-00801 internal error [phdxcsql_canonicalize_sql:state]
with .... == 1
I get:
Line 0, Col 0:
The expression is not properly formed.
I have no bloody idea, what that means and what might be wrong in here ? Even google does not return 1 singel page for the error-parameter !
I tried several versions:
"IS_NUMBER_NUM"( GRP_IN.ANZAHL,'NLS_NUMERIC_CHARACTERS='',.''') = 1
also this: "IS_NUMBER_NUM"( GRP_IN.ANZAHL) = 1
but nothing is accepted !
Also I made a more easy function for checking for date-format, which works fine in SQL*PLUS, but can't be validated in OWB-splitter.
Oracle support is playing for time since days !
thsi function brings same error, depending if I use 1 or 2 "=" !???
any idea ?
somehow I have the feeling, I missed 1 easy rule on how to use a splitter-condition correctly ?
But I can't see anything wrong in my constructions, especially because they are working fine in SQL*PLUS !???
thanks for any hint, LaoDe

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