How do I get query result(select e.g.) from a dynamic command(EXECUTE)?

[Wei Wang]

Hi,

I want to do a select in dynamic command, something like:

TRIGGER FUNCTION
DECLARE
table_name_suffix text;
temp_result RECORD;
temp_result2 RECORD;

....

BEGIN
--initialization of table_name_suffix(from TG_RELNAME e.g.)
select into temp_result from
''fixed_table_name_prefix''||table_name_suffix where another_table_name =
abc;

--Then I want to use part of the result as part of the table name for my
next query
select into temp_result2 from
''fixed_table_name_prefix''||temp_result.anotherta blename;

END

I know that SELECT INTO doesn't support dynamic command, EXECUTE does. But
if I EXECUTE a select query, how do I get
the select result from it?

Many thanks,

Wei Wang
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[Wei Wang]

Sorry. I just found it in the documentation. FOR-IN-EXECUTE or
OPEN-FOR-EXECUTE.
----- Original Message -----
From: "Wei Wang" <ww***@cam.ac.uk>
To: "pgsql" <pg***********@postgresql.org>
Sent: Thursday, February 19, 2004 11:50 AM
Subject: [GENERAL] How do I get query result(select e.g.) from a dynamic
command(EXECUTE)?

Hi,

I want to do a select in dynamic command, something like:

TRIGGER FUNCTION
DECLARE
table_name_suffix text;
temp_result RECORD;
temp_result2 RECORD;

...

BEGIN
--initialization of table_name_suffix(from TG_RELNAME e.g.)
select into temp_result from
''fixed_table_name_prefix''||table_name_suffix where another_table_name =
abc;

--Then I want to use part of the result as part of the table name for my next query
select into temp_result2 from
''fixed_table_name_prefix''||temp_result.anotherta blename;

END

I know that SELECT INTO doesn't support dynamic command, EXECUTE does. But
if I EXECUTE a select query, how do I get
the select result from it?

Many thanks,

Wei Wang
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[Richard Huxton]

On Thursday 19 February 2004 11:50, Wei Wang wrote:

Hi,

I want to do a select in dynamic command, something like:
[snip] I know that SELECT INTO doesn't support dynamic command, EXECUTE does. But
if I EXECUTE a select query, how do I get
the select result from it?

FOR record | row IN EXECUTE text_expression LOOP
statements
END LOOP;

It's in the manuals, but that's about all they say on the subject
--
Richard Huxton
Archonet Ltd

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