From: | InterRob <rob(dot)marjot(at)gmail(dot)com> |
---|---|
To: | pgsql-general <pgsql-general(at)postgresql(dot)org> |
Subject: | stored procedure: RETURNS record |
Date: | 2009-09-25 16:34:48 |
Message-ID: | 671e36b0909250934u40e001cbge9ad1197a4a3de77@mail.gmail.com |
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Lists: | pgsql-general |
Dear list,
I am trying to find out whether I can use the "record" type as a polymorphic
return type to return multiple columns, to be determined at runtime. In
fact, I'm trying to write a function that provides a generic implementation
of some deserialization of a certain field.
The prototype of the function I came up with, is as follows:
>> CREATE FUNCTION deserialize(the_table t1) RETURNS record << etc. etc. >>
;
It is intended to return multiple fields in an anonymous row: only at time
of invocation it is known what fields will this row consist of...
The function is used in the following statement:
>> SELECT * FROM (SELECT deserialize( t1 ) FROM t1) ss;
Unfortunately, this results in ONE row, with ONE column. E.g.:
MYDB=# select * from (SELECT deserialize(kvp) FROM kvp) ss;
deserialize
-----------
(1,2)
(1 row)
I guess I am seeking to prototype the anonymous row layout in the above SQL
statement?
Hope you have any idea,
regards,
Rob
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