Php/docs/function.pg-lo-seek
pg_lo_seek
(PHP 4 >= 4.2.0, PHP 5, PHP 7)
pg_lo_seek — Seeks position within a large object
Description
pg_lo_seek
( resource $large_object
, int $offset
[, int $whence
= PGSQL_SEEK_CUR
] ) : bool
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) orPGSQL_SEEK_END
(seek from object end) .
Return Values
Returns TRUE
on success or FALSE
on failure.
Examples
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;?>
Changelog
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. |