Prevent interpretation of special characters in enter-query mode

My problem goes as follows:
- forms version: Forms [32 Bit] Version (Production)
- non-database item block.X, char
- block.X is filled in post-query trigger. The post-query logic cannot be integrated in a view because it uses procedures, and usage of a pipelined function + view is currently not allowed due to "internal restrictions". Put simply: all logic to fill the field must remain in the post-query trigger
- user wants the field to be queryable. This is achieved by storing the entered criterium in a variable in the pre-query trigger, and using it in the post-query trigger to exclude records. E.g.
pre-query ==> help_block.query_X := block.X;
post-query ==> if help_block.query_X is not null and block.X is null or not block.X like help_block.query then raise form_trigger_failure; end if;
- this works fine for "regular" search strings. However:
- whenever the search string starts with <, <=, >, >=, !, forms seems to interpret the leading characters before doing anything else. During pre-query, block.X is null, and as soon as I use it in pl/sql, I get FRM-40831: Truncation Occured: value too long for field. E.g.
user puts the following in block.X ==> '<X', so he wants to search for records with value '<X' (text; not 'smaller than ...')
pre-query => ==> appears to be empty/null, but right after the message, I get FRM-40831 Truncation Occured: value too long for field ...
This only happens if < is the first non-space character in the search string.
Does anyone know of a way to prevent oracle from interpreting the <, <=, ... characters entered in enter-query mode?

I'm sorry for not making myself clear; I'll give it another go:
The problem is that, if I enter '<abc' in a form field in enter-query mode (so during creation of the "example record"), forms immediately interprets the < as 'smaller than' and does some obscure things with it (my guess: converting to a where clause, but since I'm using a non db field, this actually does nothing), and finishes by erasing the field contents (in the example record). In the pre-query trigger, I can no longer get the '<abc' and store it. I want one of the following:
- prevent forms from interpreting the '<' in front (same thing happens for !=, <=, >=, =, ...)
- capture the entered string ('<abc') before forms reacts to the '<' in front
Edited by: [email protected] on Feb 17, 2009 12:30 PM

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