Temporally disabled foreign key constraint check?

Good morning,

Is there a way to temporally disabled foreign key constraints something
like:

SET FOREIGN_KEY_CHECKS=0

When population is done, will set FOREIGN_KEY_CHECKS=1

Thanks a lot!
Emi

--
Emi Lu, ENCS, Concordia University, Montreal H3G 1M8
emilu(at)encs(dot)concordia(dot)ca +1 514 848-2424 x5884

On Fri, Oct 21, 2011 at 8:33 PM, Emi Lu <emilu(at)encs(dot)concordia(dot)ca> wrote:

> Good morning,
>
>
> Is there a way to temporally disabled foreign key constraints something
> like:
>
> SET FOREIGN_KEY_CHECKS=0
>
> When population is done, will set FOREIGN_KEY_CHECKS=1
>
>
You can disable *triggers* on a table (which will disable all the FK
constraints, but not things like 'not nul' or 'unique').

For Disable:

update pg_class set reltriggers=0 where relname = 'TEST';

For Enable:

update pg_class set reltriggers = count(*) from pg_trigger where
pg_class.oid=tgrelid and relname='TEST';

--Raghu

raghu ram <raghuchennuru(at)gmail(dot)com> hat am 21. Oktober 2011 um 17:12
geschrieben:

>
>
> On Fri, Oct 21, 2011 at 8:33 PM, Emi Lu<emilu(at)encs(dot)concordia(dot)ca>wrote:
>
> > Good morning,
> >
> >
> > Is there a way to temporally disabled foreign key constraints something
> > like:
> >
> > SET FOREIGN_KEY_CHECKS=0
> >
> > When population is done, will set FOREIGN_KEY_CHECKS=1
> >
> >
You can disable *triggers* on a table (which will disable all the FK
constraints, but not things like 'not nul' or 'unique').
> For Disable:
> update pg_class set reltriggers=0 where relname = 'TEST';
> For Enable:
> update pg_class set reltriggers = count(*) from pg_trigger where
> pg_class.oid=tgrelid and relname='TEST';
>
>

 
 
 
No, don't manipulate pg_* - tables. Use instead ALTER TABLE ... DISABLE TRIGGER
...
 
 
Regards, Andreas 

>  
> --Raghu 
>
>

Thank you first.

I believe that upate pg_class can only be done by superuser, right?

Besides, if I need the whole schema's foreign keys to be disabled and
then enabled later.

Is there a simple command could do it? Similar to mysql's "set
FOREIGN_KEY_CHECKS = false/true"?

Emi

On 10/21/2011 11:12 AM, raghu ram wrote:
>
>
> On Fri, Oct 21, 2011 at 8:33 PM, Emi Lu <emilu(at)encs(dot)concordia(dot)ca
> <mailto:emilu(at)encs(dot)concordia(dot)ca>> wrote:
>
> Good morning,
>
>
> Is there a way to temporally disabled foreign key constraints
> something like:
>
> SET FOREIGN_KEY_CHECKS=0
>
> When population is done, will set FOREIGN_KEY_CHECKS=1
>
>
> You can disable *triggers* on a table (which will disable all the FK
> constraints, but not things like 'not nul' or 'unique').
>
> For Disable:
>
> update pg_class set reltriggers=0 where relname = 'TEST';
>
> For Enable:
>
> update pg_class set reltriggers = count(*) from pg_trigger where
> pg_class.oid=tgrelid and relname='TEST';
>
> --Raghu

--
Emi Lu, ENCS, Concordia University, Montreal H3G 1M8
emilu(at)encs(dot)concordia(dot)ca +1 514 848-2424 x5884

On Fri, Oct 21, 2011 at 9:19 PM, Emi Lu <emilu(at)encs(dot)concordia(dot)ca> wrote:

> Thank you first.
>
> I believe that upate pg_class can only be done by superuser, right?
>

Yes,it's requires superuser privileges.

>
> Besides, if I need the whole schema's foreign keys to be disabled and then
> enabled later.
>
> Is there a simple command could do it? Similar to mysql's "set
> FOREIGN_KEY_CHECKS = false/true"?
>
>
No. The main goal for PG is to secure data integrity, and you can't switch
off this feature.

Disable the constraints:

alter table <tablename> disable trigger all;

You can use this command inside your transaction too, but don't forget to
reactivate the triggers because this change will become global after
the transaction ends!
--Raghu

> On 10/21/2011 11:12 AM, raghu ram wrote:
>
>>
>>
>> On Fri, Oct 21, 2011 at 8:33 PM, Emi Lu <emilu(at)encs(dot)concordia(dot)ca
>> <mailto:emilu(at)encs(dot)concordia(dot)**ca <emilu(at)encs(dot)concordia(dot)ca>>> wrote:
>>
>> Good morning,
>>
>>
>> Is there a way to temporally disabled foreign key constraints
>> something like:
>>
>> SET FOREIGN_KEY_CHECKS=0
>>
>> When population is done, will set FOREIGN_KEY_CHECKS=1
>>
>>
>> You can disable *triggers* on a table (which will disable all the FK
>> constraints, but not things like 'not nul' or 'unique').
>>
>> For Disable:
>>
>> update pg_class set reltriggers=0 where relname = 'TEST';
>>
>> For Enable:
>>
>> update pg_class set reltriggers = count(*) from pg_trigger where
>> pg_class.oid=tgrelid and relname='TEST';
>>
>> --Raghu
>>
>
>
> --
> Emi Lu, ENCS, Concordia University, Montreal H3G 1M8
> emilu(at)encs(dot)concordia(dot)ca +1 514 848-2424 x5884
>