2007-03-10 04:42:19 +01:00
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--
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-- Test large object support
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--
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2009-08-04 18:08:37 +02:00
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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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2007-03-10 04:42:19 +01:00
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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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2012-09-15 00:24:53 +02:00
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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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2007-03-10 04:42:19 +01:00
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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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Whose woods these are I think I know,
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His house is in the village though.
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He will not see me stopping here,
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To watch his woods fill up with snow.
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My little horse must think it queer,
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To stop without a farmhouse near,
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Between the woods and frozen lake,
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The darkest evening of the year.
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He gives his harness bells a shake,
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To ask if there is some mistake.
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The only other sound''s the sweep,
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Of easy wind and downy flake.
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The woods are lovely, dark and deep,
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But I have promises to keep,
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And miles to go before I sleep,
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And miles to go before I sleep.
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-- Robert Frost
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') FROM lotest_stash_values;
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lowrite
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---------
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578
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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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-- 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, 422, 0) FROM lotest_stash_values;
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lo_lseek
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----------
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422
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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, 35) FROM lotest_stash_values;
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loread
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-------------------------------------
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The woods are lovely, dark and deep
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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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438
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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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439
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(1 row)
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SELECT lo_lseek(fd, -156, 2) FROM lotest_stash_values;
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lo_lseek
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----------
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422
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(1 row)
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SELECT loread(fd, 35) FROM lotest_stash_values;
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loread
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-------------------------------------
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The woods are lonely, dark and deep
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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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2008-12-04 15:51:02 +01:00
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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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2007-03-10 04:42:19 +01:00
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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, 10) 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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\012Whose woo
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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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|
2012-10-09 00:24:06 +02:00
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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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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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|
0
|
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|
(1 row)
|
|
|
|
|
2007-03-10 04:42:19 +01:00
|
|
|
END;
|
|
|
|
-- lo_unlink(lobjId oid) returns integer
|
|
|
|
-- return value appears to always be 1
|
|
|
|
SELECT lo_unlink(loid) from lotest_stash_values;
|
|
|
|
lo_unlink
|
|
|
|
-----------
|
|
|
|
1
|
|
|
|
(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');
|
|
|
|
BEGIN;
|
|
|
|
UPDATE lotest_stash_values SET fd=lo_open(loid, CAST(x'20000' | x'40000' AS integer));
|
2012-09-15 00:24:53 +02:00
|
|
|
-- verify length of large object
|
|
|
|
SELECT lo_lseek(fd, 0, 2) FROM lotest_stash_values;
|
|
|
|
lo_lseek
|
|
|
|
----------
|
2012-09-15 18:17:51 +02:00
|
|
|
680800
|
2012-09-15 00:24:53 +02:00
|
|
|
(1 row)
|
|
|
|
|
2007-03-10 04:42:19 +01:00
|
|
|
-- 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;
|
|
|
|
lo_lseek
|
|
|
|
----------
|
|
|
|
2030
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
-- 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;
|
2009-11-22 21:58:51 +01:00
|
|
|
loread
|
2007-03-10 04:42:19 +01:00
|
|
|
--------------------------------------------------------------
|
|
|
|
44\011144\0111144\0114144\0119144\01188\01189\011SNAAAA\011F
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
SELECT lo_tell(fd) FROM lotest_stash_values;
|
|
|
|
lo_tell
|
|
|
|
---------
|
|
|
|
2066
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
SELECT lo_lseek(fd, -26, 1) FROM lotest_stash_values;
|
|
|
|
lo_lseek
|
|
|
|
----------
|
|
|
|
2040
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
SELECT lowrite(fd, 'abcdefghijklmnop') FROM lotest_stash_values;
|
|
|
|
lowrite
|
|
|
|
---------
|
|
|
|
16
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
SELECT lo_lseek(fd, 2030, 0) FROM lotest_stash_values;
|
|
|
|
lo_lseek
|
|
|
|
----------
|
|
|
|
2030
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
SELECT loread(fd, 36) FROM lotest_stash_values;
|
2009-11-22 21:58:51 +01:00
|
|
|
loread
|
2007-03-10 04:42:19 +01:00
|
|
|
--------------------------------------------------
|
|
|
|
44\011144\011114abcdefghijklmnop9\011SNAAAA\011F
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
SELECT lo_close(fd) FROM lotest_stash_values;
|
|
|
|
lo_close
|
|
|
|
----------
|
|
|
|
0
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
END;
|
|
|
|
SELECT lo_export(loid, '@abs_builddir@/results/lotest.txt') FROM lotest_stash_values;
|
|
|
|
lo_export
|
|
|
|
-----------
|
|
|
|
1
|
|
|
|
(1 row)
|
|
|
|
|
|
|
|
\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;
|
|
|
|
pageno | data
|
|
|
|
--------+------
|
|
|
|
(0 rows)
|
|
|
|
|
|
|
|
SELECT lo_unlink(loid) FROM lotest_stash_values;
|
|
|
|
lo_unlink
|
|
|
|
-----------
|
|
|
|
1
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(1 row)
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\lo_unlink :newloid
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2013-10-28 03:42:46 +01:00
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\lo_import 'results/lotest.txt'
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\set newloid_1 :LASTOID
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2014-06-12 21:39:09 +02:00
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SELECT lo_from_bytea(0, lo_get(:newloid_1)) AS newloid_2
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2013-10-28 03:42:46 +01:00
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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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|
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|
(1 row)
|
|
|
|
|
|
|
|
SELECT lo_get(:newloid_1);
|
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|
ERROR: large object read request is too large
|
|
|
|
SELECT lo_get(:newloid_1, 4294967294, 100);
|
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|
lo_get
|
|
|
|
---------------------------------------------------------------------
|
|
|
|
\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000foo
|
|
|
|
(1 row)
|
|
|
|
|
|
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|
\lo_unlink :newloid_1
|
|
|
|
\lo_unlink :newloid_2
|
2007-03-10 04:42:19 +01:00
|
|
|
TRUNCATE lotest_stash_values;
|
2012-09-15 00:24:53 +02:00
|
|
|
DROP ROLE regresslo;
|