I have a query string generated in a postgres UDF, i'd like to put it's result in a temp table to perform joins against (I'm using LIMIT
and OFFSET
, and I don't want to join against other ttables only to end up choping the data off at the end --i.e., the LIMIT operator in the query plan). I attempt to create the temp table with the following statement.
CREATE LOCAL TEMP TABLE query_result ON COMMIT DROP AS EXECUTE query_string_;
But I get the following error notice :
********** Error **********
ERROR: prepared statement "query_string_" does not exist
SQL state: 26000
Context: SQL statement "CREATE LOCAL TEMP TABLE query_result ON COMMIT DROP AS EXECUTE query_string_"
PL/pgSQL function "search_posts_unjoined" line 48 at SQL statement
Additionally, I tried preparing the statemen, but I couldn't get the syntax right either.
The UDF in question is :
CREATE OR REPLACE FUNCTION search_posts_unjoined(
forum_id_ INTEGER,
query_ CHARACTER VARYING,
offset_ INTEGER DEFAULT NULL,
limit_ INTEGER DEFAULT NULL,
from_date_ TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
to_date_ TIMESTAMP WITHOUT TIME ZONE DEFAULT NULL,
in_categories_ INTEGER[] DEFAULT '{}'
)
RETURNS SETOF forum_posts AS $$
DECLARE
join_string CHARACTER VARYING := ' ';
from_where_date CHARACTER VARYING := ' ';
to_where_date CHARACTER VARYING := ' ';
query_string_ CHARACTER VARYING := ' ';
offset_str_ CHARACTER VARYING := ' ';
limit_str_ CHARACTER VARYING := ' ';
BEGIN
IF NOT from_date_ IS NULL THEN
from_where_date := ' AND fp.posted_at > ''' || from_date_ || '''';
END IF;
IF NOT to_date_ IS NULL THEN
to_where_date := ' AND fp.posted_at < ''' || to_date_ || '''';
END IF;
IF NOT offset_ IS NULL THEN
offset_str_ := ' OFFSET ' || offset_;
END IF;
IF NOT limit_ IS NULL THEN
limit_str_ := ' LIMIT ' || limit_;
END IF;
IF NOT limit_ IS NULL THEN
END IF;
CREATE LOCAL TEMP TABLE un_cat(id) ON COMMIT DROP AS (select * from unnest(in_categories_)) ;
if in_categories_ != '{}' THEN
join_string := ' INNER JOIN un_cat uc ON uc.id = fp.category_id ' ;
END IF;
query_string_ := '
SELECT fp.*
FROM forum_posts fp' ||
join_string
||
'WHERE fp.forum_id = ' || forum_id_ || ' AND
to_tsvector(''english'',fp.post_text) @@ to_tsquery(''english'','''|| query_||''')' ||
from_where_date ||
to_where_date ||
offset_str_ ||
limit_str_
|| ';';
CREATE LOCAL TEMP TABLE query_result ON COMMIT DROP AS EXECUTE query_string_;
RAISE NOTICE '%', query_string_;
RETURN QUERY
EXECUTE query_string_;
END;
$$ LANGUAGE plpgsql;
And it works when the statement in question is removed.
Use instead:
EXECUTE '
CREATE TEMP TABLE query_result ON COMMIT DROP AS '|| query_string_;
EXECUTE
the whole statement.
The syntax form CREATE TABLE foo AS EXECUTE <query>
isn't valid.
LOCAL
is just a noise word and ignored in this context.
More details in the manual.
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