RE: Do triggers cause a context switch between SQL & PL/SQL

From: Jamadagni, Rajendra <Rajendra.Jamadagni_at_espn.com>
Date: Tue, 01 Apr 2003 10:24:02 -0800
Message-ID: <F001.0057745B.20030401102402@fatcity.com>

Yes ...

Raj

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Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----
Sent: Tuesday, April 01, 2003 12:49 PM
To: Multiple recipients of list ORACLE-L

Question:

If some idiot decides to circumvent Oracle's referential integrity and re-implement it by using triggers (insert, update, delete) that checks the foreign (parent/child) key fields in other tables like this,

declare numrows INTEGER;
begin

• ApplicationForm is used if the state and other criteria match that in
• ApplicationFormCriteria ON PARENT DELETE RESTRICT select count(*) into numrows from ApplicationFormCriteria where ApplicationFormCriteria.applicationFormId = :old.applicationFormId; if (numrows > 0) then raise_application_error( -20343, 'Database Integrity Violation - Cannot DELETE row in Table
  ''ApplicationForm'' because referencing row exists in table
  ''ApplicationFormCriteria'' for Primary Key (applicationFormId)=' ||
  :old.applicationFormId ); end if;

end;

would it cause context switching between the SQL & PL/SQL engines?

Yes, some genius did this in one of our databases. Two hundred third/fourth normal form tables enforced by 800 triggers... I have him registered to be stoned in public.

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Author: Jamadagni, Rajendra
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Received on Tue Apr 01 2003 - 12:24:02 CST