Lists: | pgsql-general |
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From: | "Abraham, Danny" <danny_abraham(at)bmc(dot)com> |
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To: | <pgsql-general(at)postgresql(dot)org> |
Subject: | Instaltiating an ARRAY within a function |
Date: | 2007-12-12 12:48:18 |
Message-ID: | E9DE7963E5EA6546B42A979EC28B4D0136B28ED5@hou-ex-02.adprod.bmc.com |
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Lists: | pgsql-general |
===========================================
CREATE OR REPLACE FUNCTION arr( inout x varchar[] )
AS
$Z$
DECLARE
i integer;
BEGIN
select ARRAY['Danny','Eissam','Moshe'] into x;
end;
$Z$ LANGUAGE 'plpgsql' VOLATILE;
===========================================
CREATE OR REPLACE FUNCTION callarr()
returns integer
AS
$Z$
DECLARE
x varchar[6];
BEGIN
perform arr(x);
RAISE NOTICE 'x[1]=%',x[1];
return 0;
end;
$Z$ LANGUAGE 'plpgsql' VOLATILE;
===========================================
select callarr();
NOTICE: x[1]=<NULL> ??? Should have been DANNY
Should it work?
Thanks
Danny
From: | "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com> |
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To: | "Abraham, Danny" <danny_abraham(at)bmc(dot)com> |
Cc: | pgsql-general(at)postgresql(dot)org |
Subject: | Re: Instaltiating an ARRAY within a function |
Date: | 2007-12-12 13:48:04 |
Message-ID: | 162867790712120548h284fc461tcbf6c76a84a0fc1c@mail.gmail.com |
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Lists: | pgsql-general |
Hello
problem is elsewhere. PostgreSQL doesn't support by ref variables. In
your sample you have to do:
CREATE OR REPLACE FUNCTION callarr()
returns integer
AS
$Z$
DECLARE
x varchar[6];
BEGIN
x := arr(x); <-------!!!!!!!!!
RAISE NOTICE 'x[1]=%',x[1];
return 0;
end;
$Z$ LANGUAGE 'plpgsql' VOLATILE;
Pavel
On 12/12/2007, Abraham, Danny <danny_abraham(at)bmc(dot)com> wrote:
> ===========================================
>
> CREATE OR REPLACE FUNCTION arr( inout x varchar[] )
> AS
> $Z$
> DECLARE
> i integer;
> BEGIN
> select ARRAY['Danny','Eissam','Moshe'] into x;
> end;
> $Z$ LANGUAGE 'plpgsql' VOLATILE;
>
> ===========================================
>
> CREATE OR REPLACE FUNCTION callarr()
> returns integer
> AS
> $Z$
> DECLARE
> x varchar[6];
> BEGIN
> perform arr(x);
> RAISE NOTICE 'x[1]=%',x[1];
> return 0;
> end;
> $Z$ LANGUAGE 'plpgsql' VOLATILE;
>
> ===========================================
>
> select callarr();
> NOTICE: x[1]=<NULL> ??? Should have been DANNY
>
>
> Should it work?
>
> Thanks
>
> Danny
>
> ---------------------------(end of broadcast)---------------------------
> TIP 5: don't forget to increase your free space map settings
>
From: | "Albe Laurenz" <laurenz(dot)albe(at)wien(dot)gv(dot)at> |
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To: | "Abraham, Danny *EXTERN*" <danny_abraham(at)bmc(dot)com>, <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Instaltiating an ARRAY within a function |
Date: | 2007-12-12 16:00:39 |
Message-ID: | D960CB61B694CF459DCFB4B0128514C2AE0A1B@exadv11.host.magwien.gv.at |
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Lists: | pgsql-general |
Danny Abraham wrote:
> ===========================================
>
> CREATE OR REPLACE FUNCTION arr( inout x varchar[] )
> AS
> $Z$
> DECLARE
> i integer;
> BEGIN
> select ARRAY['Danny','Eissam','Moshe'] into x;
> end;
> $Z$ LANGUAGE 'plpgsql' VOLATILE;
>
> ===========================================
>
> CREATE OR REPLACE FUNCTION callarr()
> returns integer
> AS
> $Z$
> DECLARE
> x varchar[6];
> BEGIN
> perform arr(x);
> RAISE NOTICE 'x[1]=%',x[1];
> return 0;
> end;
> $Z$ LANGUAGE 'plpgsql' VOLATILE;
>
> ===========================================
>
> select callarr();
> NOTICE: x[1]=<NULL> ??? Should have been DANNY
>
>
> Should it work?
Not the way you wrote it.
You are confused by output parameters which do not work the way one
might expect. They are just a simple syntax for composite return types.
CREATE FUNCTION arr(INOUT x varchar[])
is synonymous to
CREATE FUNCTION arr(x varchar[]) RETURNS varchar[]
So your example should work if you replace
PERFORM arr(x);
with
x := arr(x);
Yours,
Laurenz Albe