pg_lo_tell
(PHP 4 >= 4.2.0, PHP 5)
pg_lo_tell --
Returns current seek position a of large object
Popis
int
pg_lo_tell ( resource large_object )
pg_lo_tell() returns the current position (offset
from the beginning) of a large object.
To use the large object interface, it is necessary to
enclose it within a transaction block.
Seznam parametrů
large_object
PostgreSQL large object (LOB) resource, returned by pg_lo_open().
Návratové hodnoty
The current seek offset (in number of bytes) from the beginning of the large
object. If there is an error, the return value is negative.
Příklady
Příklad 1. pg_lo_tell() 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); // See how far we've skipped $offset = pg_lo_tell($handle); echo "Seek position is: $offset"; pg_query($database, "commit"); ?>
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