pg_lo_tell

(PHP 4 >= 4.2.0, PHP 5)

pg_lo_tell --  Returns current seek position a of large object

Описание

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.

Список параметров

large_object

PostgreSQL large object (LOB) resource, returned by pg_lo_open().

Возвращаемые значения

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.

Примеры

Пример 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");
?>

Результат выполнения данного примера:

Seek position is: 50000

Смотрите также

pg_lo_seek()