(PHP 4 >= 4.2.0, PHP 5, PHP 7)
Seeks position within a large object
bool pg_lo_seek ( resource $large_object, int $offset [, int $whence = PGSQL_SEEK_CUR ] )
pg_lo_seek() seeks a position within a large object resource.
To use the large object interface, it is necessary to enclose it within a transaction block.
Parameters:
large_object
PostgreSQL large object (LOB) resource, returned by pg_lo_open().
offset
The number of bytes to seek.
whence
One of the constants PGSQL_SEEK_SET
(seek from object start), PGSQL_SEEK_CUR
(seek from current position) or PGSQL_SEEK_END
(seek from object end) .
Returns:
Returns TRUE
on success or FALSE
on failure.
Changelog:
5.6.0
Added PostgreSQL 9.3's 64bit large object support. Both client and server must support PostgreSQL 9.3 and PHP must be 64bit build to use 64bit large object.
Examples:
pg_lo_seek() example
<?php $doc_oid = 189762345; $database = pg_connect("dbname=jacarta"); pg_query($database, "begin"); $handle = pg_lo_open($database, $doc_oid, "r"); // Skip first 50000 bytes pg_lo_seek($handle, 50000, PGSQL_SEEK_SET); // Read the next 10000 bytes $data = pg_lo_read($handle, 10000); pg_query($database, "commit"); echo $data; ?>
See also:
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