mirror of
https://github.com/postgres/postgres.git
synced 2025-05-17 06:41:24 +03:00
7e00e09872
Robert Frost is no longer with us, but his copyrights still are, so let's stop using "Stopping by Woods on a Snowy Evening" as test data before somebody decides to sue us. Wordsworth is more safely dead.
237 lines
7.0 KiB
Plaintext
237 lines
7.0 KiB
Plaintext
--
|
|
-- Test large object support
|
|
--
|
|
|
|
-- ensure consistent test output regardless of the default bytea format
|
|
SET bytea_output TO escape;
|
|
|
|
-- Load a file
|
|
CREATE TABLE lotest_stash_values (loid oid, fd integer);
|
|
-- lo_creat(mode integer) returns oid
|
|
-- The mode arg to lo_creat is unused, some vestigal holdover from ancient times
|
|
-- returns the large object id
|
|
INSERT INTO lotest_stash_values (loid) SELECT lo_creat(42);
|
|
|
|
-- Test ALTER LARGE OBJECT
|
|
CREATE ROLE regresslo;
|
|
DO $$
|
|
BEGIN
|
|
EXECUTE 'ALTER LARGE OBJECT ' || (select loid from lotest_stash_values)
|
|
|| ' OWNER TO regresslo';
|
|
END
|
|
$$;
|
|
SELECT
|
|
rol.rolname
|
|
FROM
|
|
lotest_stash_values s
|
|
JOIN pg_largeobject_metadata lo ON s.loid = lo.oid
|
|
JOIN pg_authid rol ON lo.lomowner = rol.oid;
|
|
|
|
-- NOTE: large objects require transactions
|
|
BEGIN;
|
|
|
|
-- lo_open(lobjId oid, mode integer) returns integer
|
|
-- The mode parameter to lo_open uses two constants:
|
|
-- INV_READ = 0x20000
|
|
-- INV_WRITE = 0x40000
|
|
-- The return value is a file descriptor-like value which remains valid for the
|
|
-- transaction.
|
|
UPDATE lotest_stash_values SET fd = lo_open(loid, CAST(x'20000' | x'40000' AS integer));
|
|
|
|
-- loread/lowrite names are wonky, different from other functions which are lo_*
|
|
-- lowrite(fd integer, data bytea) returns integer
|
|
-- the integer is the number of bytes written
|
|
SELECT lowrite(fd, '
|
|
I wandered lonely as a cloud
|
|
That floats on high o''er vales and hills,
|
|
When all at once I saw a crowd,
|
|
A host, of golden daffodils;
|
|
Beside the lake, beneath the trees,
|
|
Fluttering and dancing in the breeze.
|
|
|
|
Continuous as the stars that shine
|
|
And twinkle on the milky way,
|
|
They stretched in never-ending line
|
|
Along the margin of a bay:
|
|
Ten thousand saw I at a glance,
|
|
Tossing their heads in sprightly dance.
|
|
|
|
The waves beside them danced; but they
|
|
Out-did the sparkling waves in glee:
|
|
A poet could not but be gay,
|
|
In such a jocund company:
|
|
I gazed--and gazed--but little thought
|
|
What wealth the show to me had brought:
|
|
|
|
For oft, when on my couch I lie
|
|
In vacant or in pensive mood,
|
|
They flash upon that inward eye
|
|
Which is the bliss of solitude;
|
|
And then my heart with pleasure fills,
|
|
And dances with the daffodils.
|
|
|
|
-- William Wordsworth
|
|
') FROM lotest_stash_values;
|
|
|
|
-- lo_close(fd integer) returns integer
|
|
-- return value is 0 for success, or <0 for error (actually only -1, but...)
|
|
SELECT lo_close(fd) FROM lotest_stash_values;
|
|
|
|
END;
|
|
|
|
-- Read out a portion
|
|
BEGIN;
|
|
UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
|
|
|
|
-- lo_lseek(fd integer, offset integer, whence integer) returns integer
|
|
-- offset is in bytes, whence is one of three values:
|
|
-- SEEK_SET (= 0) meaning relative to beginning
|
|
-- SEEK_CUR (= 1) meaning relative to current position
|
|
-- SEEK_END (= 2) meaning relative to end (offset better be negative)
|
|
-- returns current position in file
|
|
SELECT lo_lseek(fd, 104, 0) FROM lotest_stash_values;
|
|
|
|
-- loread/lowrite names are wonky, different from other functions which are lo_*
|
|
-- loread(fd integer, len integer) returns bytea
|
|
SELECT loread(fd, 28) FROM lotest_stash_values;
|
|
|
|
SELECT lo_lseek(fd, -19, 1) FROM lotest_stash_values;
|
|
|
|
SELECT lowrite(fd, 'n') FROM lotest_stash_values;
|
|
|
|
SELECT lo_tell(fd) FROM lotest_stash_values;
|
|
|
|
SELECT lo_lseek(fd, -744, 2) FROM lotest_stash_values;
|
|
|
|
SELECT loread(fd, 28) FROM lotest_stash_values;
|
|
|
|
SELECT lo_close(fd) FROM lotest_stash_values;
|
|
|
|
END;
|
|
|
|
-- Test resource management
|
|
BEGIN;
|
|
SELECT lo_open(loid, x'40000'::int) from lotest_stash_values;
|
|
ABORT;
|
|
|
|
-- Test truncation.
|
|
BEGIN;
|
|
UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
|
|
|
|
SELECT lo_truncate(fd, 11) FROM lotest_stash_values;
|
|
SELECT loread(fd, 15) FROM lotest_stash_values;
|
|
|
|
SELECT lo_truncate(fd, 10000) FROM lotest_stash_values;
|
|
SELECT loread(fd, 10) FROM lotest_stash_values;
|
|
SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
|
|
SELECT lo_tell(fd) FROM lotest_stash_values;
|
|
|
|
SELECT lo_truncate(fd, 5000) FROM lotest_stash_values;
|
|
SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
|
|
SELECT lo_tell(fd) FROM lotest_stash_values;
|
|
|
|
SELECT lo_close(fd) FROM lotest_stash_values;
|
|
END;
|
|
|
|
-- Test 64-bit large object functions.
|
|
BEGIN;
|
|
UPDATE lotest_stash_values SET fd = lo_open(loid, CAST(x'20000' | x'40000' AS integer));
|
|
|
|
SELECT lo_lseek64(fd, 4294967296, 0) FROM lotest_stash_values;
|
|
SELECT lowrite(fd, 'offset:4GB') FROM lotest_stash_values;
|
|
SELECT lo_tell64(fd) FROM lotest_stash_values;
|
|
|
|
SELECT lo_lseek64(fd, -10, 1) FROM lotest_stash_values;
|
|
SELECT lo_tell64(fd) FROM lotest_stash_values;
|
|
SELECT loread(fd, 10) FROM lotest_stash_values;
|
|
|
|
SELECT lo_truncate64(fd, 5000000000) FROM lotest_stash_values;
|
|
SELECT lo_lseek64(fd, 0, 2) FROM lotest_stash_values;
|
|
SELECT lo_tell64(fd) FROM lotest_stash_values;
|
|
|
|
SELECT lo_truncate64(fd, 3000000000) FROM lotest_stash_values;
|
|
SELECT lo_lseek64(fd, 0, 2) FROM lotest_stash_values;
|
|
SELECT lo_tell64(fd) FROM lotest_stash_values;
|
|
|
|
SELECT lo_close(fd) FROM lotest_stash_values;
|
|
END;
|
|
|
|
-- lo_unlink(lobjId oid) returns integer
|
|
-- return value appears to always be 1
|
|
SELECT lo_unlink(loid) from lotest_stash_values;
|
|
|
|
TRUNCATE lotest_stash_values;
|
|
|
|
INSERT INTO lotest_stash_values (loid) SELECT lo_import('@abs_srcdir@/data/tenk.data');
|
|
|
|
BEGIN;
|
|
UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
|
|
|
|
-- verify length of large object
|
|
SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
|
|
|
|
-- with the default BLKSZ, LOBLKSZ = 2048, so this positions us for a block
|
|
-- edge case
|
|
SELECT lo_lseek(fd, 2030, 0) FROM lotest_stash_values;
|
|
|
|
-- this should get half of the value from page 0 and half from page 1 of the
|
|
-- large object
|
|
SELECT loread(fd, 36) FROM lotest_stash_values;
|
|
|
|
SELECT lo_tell(fd) FROM lotest_stash_values;
|
|
|
|
SELECT lo_lseek(fd, -26, 1) FROM lotest_stash_values;
|
|
|
|
SELECT lowrite(fd, 'abcdefghijklmnop') FROM lotest_stash_values;
|
|
|
|
SELECT lo_lseek(fd, 2030, 0) FROM lotest_stash_values;
|
|
|
|
SELECT loread(fd, 36) FROM lotest_stash_values;
|
|
|
|
SELECT lo_close(fd) FROM lotest_stash_values;
|
|
END;
|
|
|
|
SELECT lo_export(loid, '@abs_builddir@/results/lotest.txt') FROM lotest_stash_values;
|
|
|
|
\lo_import 'results/lotest.txt'
|
|
|
|
\set newloid :LASTOID
|
|
|
|
-- just make sure \lo_export does not barf
|
|
\lo_export :newloid 'results/lotest2.txt'
|
|
|
|
-- This is a hack to test that export/import are reversible
|
|
-- This uses knowledge about the inner workings of large object mechanism
|
|
-- which should not be used outside it. This makes it a HACK
|
|
SELECT pageno, data FROM pg_largeobject WHERE loid = (SELECT loid from lotest_stash_values)
|
|
EXCEPT
|
|
SELECT pageno, data FROM pg_largeobject WHERE loid = :newloid;
|
|
|
|
|
|
SELECT lo_unlink(loid) FROM lotest_stash_values;
|
|
\lo_unlink :newloid
|
|
|
|
\lo_import 'results/lotest.txt'
|
|
|
|
\set newloid_1 :LASTOID
|
|
|
|
SELECT lo_from_bytea(0, lo_get(:newloid_1)) AS newloid_2
|
|
\gset
|
|
|
|
SELECT md5(lo_get(:newloid_1)) = md5(lo_get(:newloid_2));
|
|
|
|
SELECT lo_get(:newloid_1, 0, 20);
|
|
SELECT lo_get(:newloid_1, 10, 20);
|
|
SELECT lo_put(:newloid_1, 5, decode('afafafaf', 'hex'));
|
|
SELECT lo_get(:newloid_1, 0, 20);
|
|
|
|
SELECT lo_put(:newloid_1, 4294967310, 'foo');
|
|
SELECT lo_get(:newloid_1);
|
|
SELECT lo_get(:newloid_1, 4294967294, 100);
|
|
|
|
\lo_unlink :newloid_1
|
|
\lo_unlink :newloid_2
|
|
|
|
TRUNCATE lotest_stash_values;
|
|
DROP ROLE regresslo;
|