guc.sql

来自「postgresql8.3.4源码,开源数据库」· SQL 代码 · 共 254 行

-- pg_regress should ensure that this default value applies; however
-- we can't rely on any specific default value of vacuum_cost_delay
SHOW datestyle;

-- SET to some nondefault value
SET vacuum_cost_delay TO 400;
SET datestyle = 'ISO, YMD';
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

-- SET LOCAL has no effect outside of a transaction
SET LOCAL vacuum_cost_delay TO 500;
SHOW vacuum_cost_delay;
SET LOCAL datestyle = 'SQL';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

-- SET LOCAL within a transaction that commits
BEGIN;
SET LOCAL vacuum_cost_delay TO 500;
SHOW vacuum_cost_delay;
SET LOCAL datestyle = 'SQL';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
COMMIT;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

-- SET should be reverted after ROLLBACK
BEGIN;
SET vacuum_cost_delay TO 600;
SHOW vacuum_cost_delay;
SET datestyle = 'German';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
ROLLBACK;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

-- Some tests with subtransactions
BEGIN;
SET vacuum_cost_delay TO 700;
SET datestyle = 'MDY';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT first_sp;
SET vacuum_cost_delay TO 800;
SHOW vacuum_cost_delay;
SET datestyle = 'German, DMY';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
ROLLBACK TO first_sp;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT second_sp;
SET vacuum_cost_delay TO 900;
SET datestyle = 'SQL, YMD';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT third_sp;
SET vacuum_cost_delay TO 1000;
SHOW vacuum_cost_delay;
SET datestyle = 'Postgres, MDY';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
ROLLBACK TO third_sp;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
ROLLBACK TO second_sp;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
ROLLBACK;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

-- SET LOCAL with Savepoints
BEGIN;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT sp;
SET LOCAL vacuum_cost_delay TO 300;
SHOW vacuum_cost_delay;
SET LOCAL datestyle = 'Postgres, MDY';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
ROLLBACK TO sp;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
ROLLBACK;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

-- SET LOCAL persists through RELEASE (which was not true in 8.0-8.2)
BEGIN;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
SAVEPOINT sp;
SET LOCAL vacuum_cost_delay TO 300;
SHOW vacuum_cost_delay;
SET LOCAL datestyle = 'Postgres, MDY';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
RELEASE SAVEPOINT sp;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
ROLLBACK;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

-- SET followed by SET LOCAL
BEGIN;
SET vacuum_cost_delay TO 400;
SET LOCAL vacuum_cost_delay TO 500;
SHOW vacuum_cost_delay;
SET datestyle = 'ISO, DMY';
SET LOCAL datestyle = 'Postgres, MDY';
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
COMMIT;
SHOW vacuum_cost_delay;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

--
-- Test RESET.  We use datestyle because the reset value is forced by
-- pg_regress, so it doesn't depend on the installation's configuration.
--
SET datestyle = iso, ymd;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;
RESET datestyle;
SHOW datestyle;
SELECT '2006-08-13 12:34:56'::timestamptz;

--
-- Test DISCARD TEMP
--
CREATE TEMP TABLE reset_test ( data text ) ON COMMIT DELETE ROWS;
SELECT relname FROM pg_class WHERE relname = 'reset_test';
DISCARD TEMP;
SELECT relname FROM pg_class WHERE relname = 'reset_test';

--
-- Test DISCARD ALL
--

-- do changes
DECLARE foo CURSOR WITH HOLD FOR SELECT 1;
PREPARE foo AS SELECT 1;
LISTEN foo_event;
SET vacuum_cost_delay = 13;
CREATE TEMP TABLE tmp_foo (data text) ON COMMIT DELETE ROWS;
CREATE ROLE temp_reset_user;
SET SESSION AUTHORIZATION temp_reset_user;
-- look changes
SELECT relname FROM pg_listener;
SELECT name FROM pg_prepared_statements;
SELECT name FROM pg_cursors;
SHOW vacuum_cost_delay;
SELECT relname from pg_class where relname = 'tmp_foo';
SELECT current_user = 'temp_reset_user';
-- discard everything
DISCARD ALL;
-- look again
SELECT relname FROM pg_listener;
SELECT name FROM pg_prepared_statements;
SELECT name FROM pg_cursors;
SHOW vacuum_cost_delay;
SELECT relname from pg_class where relname = 'tmp_foo';
SELECT current_user = 'temp_reset_user';
DROP ROLE temp_reset_user;

--
-- Tests for function-local GUC settings
--

set regex_flavor = advanced;

create function report_guc(text) returns text as
$$ select current_setting($1) $$ language sql
set regex_flavor = basic;

select report_guc('regex_flavor'), current_setting('regex_flavor');

-- this should draw only a warning
alter function report_guc(text) set search_path = no_such_schema;

-- with error occurring here
select report_guc('regex_flavor'), current_setting('regex_flavor');

alter function report_guc(text) reset search_path set regex_flavor = extended;

select report_guc('regex_flavor'), current_setting('regex_flavor');

alter function report_guc(text) reset all;

select report_guc('regex_flavor'), current_setting('regex_flavor');

-- SET LOCAL is restricted by a function SET option
create or replace function myfunc(int) returns text as $$
begin
  set local regex_flavor = extended;
  return current_setting('regex_flavor');
end $$
language plpgsql
set regex_flavor = basic;

select myfunc(0), current_setting('regex_flavor');

alter function myfunc(int) reset all;

select myfunc(0), current_setting('regex_flavor');

set regex_flavor = advanced;

-- but SET isn't
create or replace function myfunc(int) returns text as $$
begin
  set regex_flavor = extended;
  return current_setting('regex_flavor');
end $$
language plpgsql
set regex_flavor = basic;

select myfunc(0), current_setting('regex_flavor');

set regex_flavor = advanced;

-- it should roll back on error, though
create or replace function myfunc(int) returns text as $$
begin
  set regex_flavor = extended;
  perform 1/$1;
  return current_setting('regex_flavor');
end $$
language plpgsql
set regex_flavor = basic;

select myfunc(0);
select current_setting('regex_flavor');
select myfunc(1), current_setting('regex_flavor');