(PHP 4 >= 4.2.0, PHP 5, PHP 7)
pg_lo_seek — Seeks position within a large object
$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.
large_objectPostgreSQL large object (LOB) resource, returned by pg_lo_open().
offsetThe 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 TRUE on success or FALSE on failure.
Example #1 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;
?>
| Version | Description |
|---|---|
| 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. |