Thread: check source of trigger

Hello,

I have a question about trigger. I have tables with the following structure:

create table A (  e_codeA char(5) default '' not null,  n_codeA varchar(20) default '' not null,  constraint A_pkey
primarykey ( e_codeA )
 
);

create table B (  e_codeB char(5) default '' not null,  e_codeA char(5) default '' not null     constraint e_codeA_ref
referencesA( e_codeA )     on delete cascade on update cascade,  n_codeB varchar(20) default '' not null,  constraint
B_pkeyprimary key ( e_tranB, e_codeA )
 
);

I have trigger and procedure on table B to capture any change and insert
into table logB:   create trigger trigger_b before insert or update or delete on B for each
row execute procedure log_change();

When I update e_codeA in table A, the constrain trigger will update e_codeA
in B. My trigger, trigger_b, also was trigged and procedure will record
change into table logB too.
How to write a code in my db procedure to check whether the procedure was
called by normal SQL or was called by cascade trigger.

Regards,
wit

On Friday 20 Sep 2002 9:25 am, wit wrote:

> I have trigger and procedure on table B to capture any change and insert
> into table logB:
>     create trigger trigger_b before insert or update or delete on B for
> each row execute procedure log_change();
>
> When I update e_codeA in table A, the constrain trigger will update e_codeA
> in B. My trigger, trigger_b, also was trigged and procedure will record
> change into table logB too.
> How to write a code in my db procedure to check whether the procedure was
> called by normal SQL or was called by cascade trigger.

There are a number of "special" variables defined if you are a trigger
procedure (not just OLD and NEW) - is that what you were after (Programmers
manual, ch 23.9)

- Richard Huxton

Hi,

In case you doing all this to replicate tables
conside contrib/dbmirror it does it fairly elegantly.

regds
mallah.

On Friday 20 September 2002 13:55, wit wrote:
> Hello,
>
> I have a question about trigger. I have tables with the following
> structure:
>
> create table A (
>    e_codeA char(5) default '' not null,
>    n_codeA varchar(20) default '' not null,
>    constraint A_pkey primary key ( e_codeA )
> );
>
> create table B (
>    e_codeB char(5) default '' not null,
>    e_codeA char(5) default '' not null
>       constraint e_codeA_ref references A( e_codeA )
>       on delete cascade on update cascade,
>    n_codeB varchar(20) default '' not null,
>    constraint B_pkey primary key ( e_tranB, e_codeA )
> );
>
> I have trigger and procedure on table B to capture any change and insert
> into table logB:
>     create trigger trigger_b before insert or update or delete on B for
> each row execute procedure log_change();
>
> When I update e_codeA in table A, the constrain trigger will update e_codeA
> in B. My trigger, trigger_b, also was trigged and procedure will record
> change into table logB too.
> How to write a code in my db procedure to check whether the procedure was
> called by normal SQL or was called by cascade trigger.
>
> Regards,
> wit
>
>
>
>
>
> ---------------------------(end of broadcast)---------------------------
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Rajesh Kumar Mallah,
Project Manager (Development)
Infocom Network Limited, New Delhi
phone: +91(11)6152172 (221) (L) ,9811255597 (M)

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