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Doc: Update PL/pgSQL sample function in plpgsql.sgml.

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The example used to explain 'Looping Through Query Results' uses
pseudo-materialized views.  Replace it with a more up-to-date example
which does the same thing with actual materialized views, which have
been available since PostgreSQL 9.3.

In the passing, change '%' as format specifier instead of '%s' as is used
in other examples in plpgsql.sgml.

Reported-by: Ian Barwick
Author: Ian Barwick
Reviewed-by: Amit Kapila
Backpatch-through: 9.4
Discussion: https://postgr.es/m/9a70d393-7904-4918-c97c-649f6d114b6a@2ndquadrant.com
This commit is contained in:
Amit Kapila 2019-09-11 10:25:49 +05:30
parent e25c87a8e1
commit 2db5262549
1 changed files with 17 additions and 7 deletions
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24
doc/src/sgml/plpgsql.sgml
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@ -2403,19 +2403,29 @@ END LOOP <optional> <replaceable>label</replaceable> </optional>;
resulting from the <replaceable>query</replaceable> and the loop body is
executed for each row. Here is an example:
<programlisting>
CREATE FUNCTION cs_refresh_mviews() RETURNS integer AS $$
CREATE FUNCTION refresh_mviews() RETURNS integer AS $$
DECLARE
mviews RECORD;
BEGIN
RAISE NOTICE 'Refreshing materialized views...';
RAISE NOTICE 'Refreshing all materialized views...';
FOR mviews IN SELECT * FROM cs_materialized_views ORDER BY sort_key LOOP
FOR mviews IN
SELECT n.nspname AS mv_schema,
c.relname AS mv_name,
pg_catalog.pg_get_userbyid(c.relowner) AS owner
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON (n.oid = c.relnamespace)
WHERE c.relkind = 'm'
ORDER BY 1
LOOP
-- Now "mviews" has one record from cs_materialized_views
-- Now "mviews" has one record with information about the materialized view
RAISE NOTICE 'Refreshing materialized view %s ...', quote_ident(mviews.mv_name);
EXECUTE format('TRUNCATE TABLE %I', mviews.mv_name);
EXECUTE format('INSERT INTO %I %s', mviews.mv_name, mviews.mv_query);
RAISE NOTICE 'Refreshing materialized view %.% (owner: %)...',
quote_ident(mviews.mv_schema),
quote_ident(mviews.mv_name),
quote_ident(mviews.owner);
EXECUTE format('REFRESH MATERIALIZED VIEW %I.%I', mviews.mv_schema, mviews.mv_name);
END LOOP;
RAISE NOTICE 'Done refreshing materialized views.';