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 1640. 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");

?>

Výše uvedený příklad vypíše:


Seek position is: 50000

Viz také

pg_lo_seek()

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pg_lo_unlink

pg_lo_seek

Last updated: Sat, 24 Mar 2007