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() - Seeks position within a large object