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Re: Unhandled Exception on Oracle Form Builder

From: Tommy DN <_at_nospam.com>
Date: Wed, 01 Dec 2004 18:58:02 +0100
Message-ID: <UoOdndfrK-a7mzPcRVnysg@scarlet.biz>


DA Morgan wrote:

> Tommy DN wrote:
> 

>> I'm working with Oracle Form Builder and I needed a trigger to check
>> something when I delete a record. I made a trigger on ' KEY-DELREC '
>> and I've written this code ( it's just a test, the delete statement
>> isn't ready ):
>>
>> ----
>> DECLARE
>> aantal number(8);
>> BEGIN
>> select count(*)
>> into aantal
>> from voorstellingen v
>> where :zalen.zaalnr = v.zaalnr;
>> show_error_alert('This query has ' + aantal + ' records');
>> raise form_trigger_failure;
>> END;
>> ----
>>
>> LITTLE EXPLANATION:
>> Another table called 'voorstellingen' can have zero or more records
>> with zaalnr as foreign key ( voorstnr as primary key, but this doesn't
>> matter, I think ). When this table has one or more records, it may not
>> be deleted. ':zalen.zaalnr' is the primary key of the table 'zalen'
>> wich I'm working with.
>>
>> THE PROBLEM:
>> When I perform this, the code above should give me a message about how
>> many records the table voorstellingen has. But when I perform it I
>> receive an unhandled exception: " ORA-06502: PL/SQL: numeric or value
>> error string ".
>>
>> Can someone help me please ???
> 
> 
> Please do not post your question to every usenet group you can spell.
> The appropriate group for Forms is c.d.o.tools.
> 
> There are two problems with your statement. The first, as pointed out
> by Dirk is you concatenate strings with || not +.
> 
> The second is that aantal is a number so you should do an explicit
> casting. Your statement should be:
> 
> show_error_alert('This query has ' || TO_CHAR(aantal) || ' records');

OK thanks, it works. So, I consider this topic closed. Received on Wed Dec 01 2004 - 11:58:02 CST

Original text of this message

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