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 | | From: | KÖPFERL_Robert | | Subject: | returning a record from PL/pgSQL | | Date: | Fri, 21 Jan 2005 12:41:09 +0100 |
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 | I just tried hard to return
a single record fromout a plpgsql-function. While the (otherwise excelent)
documentation didn't give me an answer, I found out that this works:
select into ret false, balance, balance;
return ret;
while ret is a composite type.
This construction however tastes not good to me. Is there a nicer way?
An example for PL/pgSQL which returns not just a scalar but also a composite
type should be added to the documentation. i.e. as second part of the RETURN
statement.
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| | From: | Michael Fuhr | | Subject: | Re: returning a record from PL/pgSQL | | Date: | Sun, 23 Jan 2005 12:00:25 -0700 |
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| On Fri, Jan 21, 2005 at 12:41:09PM +0100, KÖPFERL Robert wrote:
>
> I just tried hard to return
> a single record fromout a plpgsql-function. While the (otherwise excelent)
> documentation didn't give me an answer, I found out that this works:
>
> select into ret false, balance, balance;
> return ret;
>
> while ret is a composite type.
>
> This construction however tastes not good to me. Is there a nicer way?
In the "Declarations" section of the PL/pgSQL documentation, under
"Row Types," is the following:
The individual fields of the row value are accessed using the
usual dot notation, for example rowvar.field.
and under "RETURN" in the "Control Structures" section is this:
To return a composite (row) value, you must write a record or
row variable as the expression.
So you could to the following:
ret.field1 := value1;
ret.field2 := value2;
ret.field3 := value3;
RETURN ret;
Internally, however, each expression in the above assignments would
be evaluated using a SELECT statement, so whether this code is
"nicer" than what you wrote depends on what you mean by "nice."
--
Michael Fuhr
http://www.fuhr.org/~mfuhr/
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