Hi Igor
I'm converting an Interbase DB for use in a smaller application, so there are
many different examples.
I've included one particular example below, where I have converted a single
Interbase trigger (which used IF statements), into 4 separate SQLite triggers.
Any advice appreciated.Russell.
/* Trigger: TEXTLISTS_B4DEL */
CREATE TRIGGER TEXTLISTS_B4DEL_genericsinfo BEFORE DELETE ON TEXTLISTS
when (old.listtype in ('W', 'C')) and
(select TextList_id from genericsinfo where TextList_id = old.textlist_id Limit
1) is not null
begin
Select Raise(Fail, 'DEPENDANCYERROR');
end;
/* Trigger: TEXTLISTS_B4DEL */
CREATE TRIGGER TEXTLISTS_B4DEL_PRODLOCATION BEFORE DELETE ON TEXTLISTS
when (old.listtype = 'L') and
(select PRODUCT_ID from PRODUCTS where LOCATION = old.identifier Limit 1) is
not null
begin
Select Raise(Fail, 'DEPENDANCYERROR');
end;
/* Trigger: TEXTLISTS_B4DEL */
CREATE TRIGGER TEXTLISTS_B4DEL_PRODTYPE BEFORE DELETE ON TEXTLISTS
when (old.listtype = 'PT') and
(select PRODUCT_ID from PRODUCTS where PRODTYPE = old.identifier Limit 1) is
not null
begin
Select Raise(Fail, 'DEPENDANCYERROR');
end;
/* Trigger: TEXTLISTS_B4DEL */
CREATE TRIGGER TEXTLISTS_B4DEL_PRODFORM BEFORE DELETE ON TEXTLISTS
when (old.listtype = 'PF') and
(select PRODUCT_ID from PRODUCTS where PROD_FORM = old.identifier Limit 1) is
not null
begin
Select Raise(Fail, 'DEPENDANCYERROR');
end;
--- On Sat, 9/10/10, Igor Tandetnik <itandet...@mvps.org> wrote:
From: Igor Tandetnik <itandet...@mvps.org>
Subject: Re: [sqlite] Confitional IF in triggers
To: sqlite-users@sqlite.org
Received: Saturday, 9 October, 2010, 12:21 AM
Russell A <slurc...@yahoo.com.au> wrote:
> This may be a really dumb question, but I've searched and can't find an
> answer.
> Do SQLite triggers support any conditional expressions, like IF, or is there
> only the WHEN statement? If the latter, does that
> mean that multiple conditions must be in separate triggers? Any help
> appreciated.Stopgap.
What kind of conditions do you have in mind? Could you give an example? There
is no IF statement in SQLite, but one can get creative with the WHEN clause on
the trigger itself, and the WHERE clauses of individual statements within the
trigger.
Igor Tandetnik
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