Re: update column based on postgis query on anther table

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On 16 Tem 2013, îat 08:24, Tom Lane <tgl@sss.pgh.pa.us> wrote:

> Stefan Sylla <stefansylla@gmx.de> writes:
>> Now I want to use a trigger function to automatically update the column
>> 'id_test1_poly' in tabel 'test1_point':
>
>> /**/
>> create or replace function test1_point_get_id_test1_poly() returns
>> trigger as $$
>>     begin
>>         new.id_test1_poly=test1_point_get_id_test1_poly(new.id);
>>     return new;
>>     end;
>> $$
>> language plpgsql volatile;
>> -- create trigger for function:
>> create trigger test1_point_get_id_test1_poly
>>   after insert or update on test1_point for each row execute procedure
>> test1_point_get_id_test1_poly();
>
> I think you need that to be a BEFORE insert or update trigger.  In
> an AFTER trigger, it's too late to affect the stored row.
>
>            regards, tom lane
>
>
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