Quoting Problem in PLPGSQL

[Alex]

Hi,

i have a problem with quoting in plpgsql. I try to insert dynamically
some conditions into a select statment but for some reason it does not work.

condition := '' AND price > 500 '';

SELECT INTO tmpRec * WHERE xxxxxx || condition || ORDER BY userId ;
What is the correct way to do this ?

Thanks
Alex

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[Oliver Elphick]

On Tue, 2003-11-18 at 08:54, Alex wrote:

Hi,

i have a problem with quoting in plpgsql. I try to insert dynamically
some conditions into a select statment but for some reason it does not work.

condition := '' AND price > 500 '';

SELECT INTO tmpRec * WHERE xxxxxx || condition || ORDER BY userId ;
What is the correct way to do this ?
FOR tmpRec IN EXECUTE ''SELECT INTO tmpRec * WHERE xxxxxx '' ||
condition || '' ORDER BY userId'' LOOP
...statements.. .
END LOOP;
From the manual:

37.6.4. Executing Dynamic Commands
Oftentimes you will want to generate dynamic commands inside
your PL/pgSQL functions, that is, commands that will involve
different tables or different data types each time they are
executed. PL/pgSQL's normal attempts to cache plans for commands
will not work in such scenarios. To handle this sort of problem,
the EXECUTE statement is provided:

EXECUTE command-string;

where command-string is an expression yielding a string (of type
text) containing the command to be executed. This string is fed
literally to the SQL engine.

Note in particular that no substitution of PL/pgSQL variables is
done on the command string. The values of variables must be
inserted in the command string as it is constructed.

--
Oliver Elphick Ol************@ lfix.co.uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
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