474 lines
11 KiB
Plaintext
474 lines
11 KiB
Plaintext
--
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-- Test large object support
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--
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-- ensure consistent test output regardless of the default bytea format
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SET bytea_output TO escape;
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-- Load a file
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CREATE TABLE lotest_stash_values (loid oid, fd integer);
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-- lo_creat(mode integer) returns oid
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-- The mode arg to lo_creat is unused, some vestigal holdover from ancient times
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-- returns the large object id
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INSERT INTO lotest_stash_values (loid) SELECT lo_creat(42);
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-- Test ALTER LARGE OBJECT
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CREATE ROLE regresslo;
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DO $$
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BEGIN
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EXECUTE 'ALTER LARGE OBJECT ' || (select loid from lotest_stash_values)
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|| ' OWNER TO regresslo';
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END
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$$;
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SELECT
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rol.rolname
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FROM
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lotest_stash_values s
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JOIN pg_largeobject_metadata lo ON s.loid = lo.oid
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JOIN pg_authid rol ON lo.lomowner = rol.oid;
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rolname
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-----------
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regresslo
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(1 row)
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-- NOTE: large objects require transactions
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BEGIN;
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-- lo_open(lobjId oid, mode integer) returns integer
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-- The mode parameter to lo_open uses two constants:
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-- INV_READ = 0x20000
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-- INV_WRITE = 0x40000
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-- The return value is a file descriptor-like value which remains valid for the
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-- transaction.
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UPDATE lotest_stash_values SET fd = lo_open(loid, CAST(x'20000' | x'40000' AS integer));
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-- loread/lowrite names are wonky, different from other functions which are lo_*
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-- lowrite(fd integer, data bytea) returns integer
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-- the integer is the number of bytes written
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SELECT lowrite(fd, '
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I wandered lonely as a cloud
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That floats on high o''er vales and hills,
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When all at once I saw a crowd,
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A host, of golden daffodils;
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Beside the lake, beneath the trees,
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Fluttering and dancing in the breeze.
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Continuous as the stars that shine
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And twinkle on the milky way,
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They stretched in never-ending line
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Along the margin of a bay:
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Ten thousand saw I at a glance,
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Tossing their heads in sprightly dance.
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The waves beside them danced; but they
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Out-did the sparkling waves in glee:
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A poet could not but be gay,
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In such a jocund company:
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I gazed--and gazed--but little thought
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What wealth the show to me had brought:
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For oft, when on my couch I lie
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In vacant or in pensive mood,
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They flash upon that inward eye
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Which is the bliss of solitude;
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And then my heart with pleasure fills,
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And dances with the daffodils.
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-- William Wordsworth
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') FROM lotest_stash_values;
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lowrite
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---------
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848
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(1 row)
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-- lo_close(fd integer) returns integer
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-- return value is 0 for success, or <0 for error (actually only -1, but...)
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SELECT lo_close(fd) FROM lotest_stash_values;
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lo_close
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----------
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0
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(1 row)
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END;
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-- Copy to another large object.
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-- Note: we intentionally don't remove the object created here;
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-- it's left behind to help test pg_dump.
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SELECT lo_from_bytea(0, lo_get(loid)) AS newloid FROM lotest_stash_values
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\gset
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-- Ideally we'd put a comment on this object for pg_dump testing purposes.
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-- But since pg_upgrade fails to preserve large object comments, doing so
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-- would break pg_upgrade's regression test.
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-- COMMENT ON LARGE OBJECT :newloid IS 'I Wandered Lonely as a Cloud';
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-- Read out a portion
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BEGIN;
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UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
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-- lo_lseek(fd integer, offset integer, whence integer) returns integer
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-- offset is in bytes, whence is one of three values:
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-- SEEK_SET (= 0) meaning relative to beginning
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-- SEEK_CUR (= 1) meaning relative to current position
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-- SEEK_END (= 2) meaning relative to end (offset better be negative)
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-- returns current position in file
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SELECT lo_lseek(fd, 104, 0) FROM lotest_stash_values;
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lo_lseek
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----------
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104
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(1 row)
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-- loread/lowrite names are wonky, different from other functions which are lo_*
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-- loread(fd integer, len integer) returns bytea
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SELECT loread(fd, 28) FROM lotest_stash_values;
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loread
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------------------------------
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A host, of golden daffodils;
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(1 row)
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SELECT lo_lseek(fd, -19, 1) FROM lotest_stash_values;
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lo_lseek
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----------
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113
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(1 row)
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SELECT lowrite(fd, 'n') FROM lotest_stash_values;
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lowrite
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---------
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1
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(1 row)
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SELECT lo_tell(fd) FROM lotest_stash_values;
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lo_tell
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---------
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114
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(1 row)
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SELECT lo_lseek(fd, -744, 2) FROM lotest_stash_values;
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lo_lseek
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----------
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104
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(1 row)
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SELECT loread(fd, 28) FROM lotest_stash_values;
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loread
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------------------------------
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A host, on golden daffodils;
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(1 row)
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SELECT lo_close(fd) FROM lotest_stash_values;
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lo_close
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----------
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0
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(1 row)
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END;
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-- Test resource management
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BEGIN;
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SELECT lo_open(loid, x'40000'::int) from lotest_stash_values;
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lo_open
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---------
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0
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(1 row)
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ABORT;
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-- Test truncation.
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BEGIN;
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UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
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SELECT lo_truncate(fd, 11) FROM lotest_stash_values;
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lo_truncate
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-------------
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0
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(1 row)
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SELECT loread(fd, 15) FROM lotest_stash_values;
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loread
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----------------
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\012I wandered
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(1 row)
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SELECT lo_truncate(fd, 10000) FROM lotest_stash_values;
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lo_truncate
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-------------
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0
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(1 row)
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SELECT loread(fd, 10) FROM lotest_stash_values;
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loread
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------------------------------------------
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\000\000\000\000\000\000\000\000\000\000
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(1 row)
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SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
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lo_lseek
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----------
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10000
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(1 row)
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SELECT lo_tell(fd) FROM lotest_stash_values;
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lo_tell
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---------
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10000
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(1 row)
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SELECT lo_truncate(fd, 5000) FROM lotest_stash_values;
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lo_truncate
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-------------
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0
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(1 row)
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SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
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lo_lseek
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----------
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5000
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(1 row)
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SELECT lo_tell(fd) FROM lotest_stash_values;
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lo_tell
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---------
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5000
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(1 row)
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SELECT lo_close(fd) FROM lotest_stash_values;
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lo_close
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----------
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0
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(1 row)
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END;
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-- Test 64-bit large object functions.
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BEGIN;
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UPDATE lotest_stash_values SET fd = lo_open(loid, CAST(x'20000' | x'40000' AS integer));
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SELECT lo_lseek64(fd, 4294967296, 0) FROM lotest_stash_values;
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lo_lseek64
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------------
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4294967296
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(1 row)
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SELECT lowrite(fd, 'offset:4GB') FROM lotest_stash_values;
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lowrite
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---------
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10
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(1 row)
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SELECT lo_tell64(fd) FROM lotest_stash_values;
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lo_tell64
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------------
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4294967306
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(1 row)
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SELECT lo_lseek64(fd, -10, 1) FROM lotest_stash_values;
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lo_lseek64
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------------
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4294967296
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(1 row)
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SELECT lo_tell64(fd) FROM lotest_stash_values;
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lo_tell64
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------------
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4294967296
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(1 row)
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SELECT loread(fd, 10) FROM lotest_stash_values;
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loread
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------------
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offset:4GB
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(1 row)
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SELECT lo_truncate64(fd, 5000000000) FROM lotest_stash_values;
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lo_truncate64
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---------------
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0
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(1 row)
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SELECT lo_lseek64(fd, 0, 2) FROM lotest_stash_values;
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lo_lseek64
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------------
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5000000000
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(1 row)
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SELECT lo_tell64(fd) FROM lotest_stash_values;
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lo_tell64
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------------
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5000000000
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(1 row)
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SELECT lo_truncate64(fd, 3000000000) FROM lotest_stash_values;
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lo_truncate64
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---------------
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0
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(1 row)
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SELECT lo_lseek64(fd, 0, 2) FROM lotest_stash_values;
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lo_lseek64
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------------
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3000000000
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(1 row)
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SELECT lo_tell64(fd) FROM lotest_stash_values;
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lo_tell64
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------------
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3000000000
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(1 row)
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SELECT lo_close(fd) FROM lotest_stash_values;
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lo_close
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----------
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0
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(1 row)
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END;
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-- lo_unlink(lobjId oid) returns integer
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-- return value appears to always be 1
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SELECT lo_unlink(loid) from lotest_stash_values;
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lo_unlink
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-----------
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1
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(1 row)
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TRUNCATE lotest_stash_values;
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INSERT INTO lotest_stash_values (loid) SELECT lo_import('@abs_srcdir@/data/tenk.data');
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BEGIN;
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UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
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-- verify length of large object
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SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
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lo_lseek
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----------
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680800
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(1 row)
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-- with the default BLKSZ, LOBLKSZ = 2048, so this positions us for a block
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-- edge case
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SELECT lo_lseek(fd, 2030, 0) FROM lotest_stash_values;
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lo_lseek
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----------
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2030
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(1 row)
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-- this should get half of the value from page 0 and half from page 1 of the
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-- large object
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SELECT loread(fd, 36) FROM lotest_stash_values;
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loread
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--------------------------------------------------------------
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44\011144\0111144\0114144\0119144\01188\01189\011SNAAAA\011F
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(1 row)
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SELECT lo_tell(fd) FROM lotest_stash_values;
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lo_tell
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---------
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2066
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(1 row)
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SELECT lo_lseek(fd, -26, 1) FROM lotest_stash_values;
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lo_lseek
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----------
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2040
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(1 row)
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SELECT lowrite(fd, 'abcdefghijklmnop') FROM lotest_stash_values;
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lowrite
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---------
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16
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(1 row)
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SELECT lo_lseek(fd, 2030, 0) FROM lotest_stash_values;
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lo_lseek
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----------
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2030
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(1 row)
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SELECT loread(fd, 36) FROM lotest_stash_values;
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loread
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--------------------------------------------------
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44\011144\011114abcdefghijklmnop9\011SNAAAA\011F
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(1 row)
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SELECT lo_close(fd) FROM lotest_stash_values;
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lo_close
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----------
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0
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(1 row)
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END;
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SELECT lo_export(loid, '@abs_builddir@/results/lotest.txt') FROM lotest_stash_values;
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lo_export
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-----------
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1
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(1 row)
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\lo_import 'results/lotest.txt'
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\set newloid :LASTOID
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-- just make sure \lo_export does not barf
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\lo_export :newloid 'results/lotest2.txt'
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-- This is a hack to test that export/import are reversible
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-- This uses knowledge about the inner workings of large object mechanism
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-- which should not be used outside it. This makes it a HACK
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SELECT pageno, data FROM pg_largeobject WHERE loid = (SELECT loid from lotest_stash_values)
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EXCEPT
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SELECT pageno, data FROM pg_largeobject WHERE loid = :newloid;
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pageno | data
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--------+------
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(0 rows)
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SELECT lo_unlink(loid) FROM lotest_stash_values;
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lo_unlink
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-----------
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1
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(1 row)
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TRUNCATE lotest_stash_values;
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\lo_unlink :newloid
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\lo_import 'results/lotest.txt'
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\set newloid_1 :LASTOID
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SELECT lo_from_bytea(0, lo_get(:newloid_1)) AS newloid_2
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\gset
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SELECT md5(lo_get(:newloid_1)) = md5(lo_get(:newloid_2));
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?column?
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----------
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t
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(1 row)
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SELECT lo_get(:newloid_1, 0, 20);
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lo_get
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-------------------------------------------
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8800\0110\0110\0110\0110\0110\0110\011800
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(1 row)
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SELECT lo_get(:newloid_1, 10, 20);
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lo_get
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-------------------------------------------
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\0110\0110\0110\011800\011800\0113800\011
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(1 row)
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SELECT lo_put(:newloid_1, 5, decode('afafafaf', 'hex'));
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lo_put
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--------
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(1 row)
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SELECT lo_get(:newloid_1, 0, 20);
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lo_get
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-------------------------------------------------
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8800\011\257\257\257\2570\0110\0110\0110\011800
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(1 row)
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SELECT lo_put(:newloid_1, 4294967310, 'foo');
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lo_put
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--------
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(1 row)
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SELECT lo_get(:newloid_1);
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ERROR: large object read request is too large
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SELECT lo_get(:newloid_1, 4294967294, 100);
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lo_get
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---------------------------------------------------------------------
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\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000foo
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(1 row)
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\lo_unlink :newloid_1
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\lo_unlink :newloid_2
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-- This object is left in the database for pg_dump test purposes
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SELECT lo_from_bytea(0, E'\\xdeadbeef') AS newloid
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\gset
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SET bytea_output TO hex;
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SELECT lo_get(:newloid);
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lo_get
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------------
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\xdeadbeef
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(1 row)
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DROP TABLE lotest_stash_values;
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DROP ROLE regresslo;
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