PHP. Руководство по PHP. 2005

pg_lo_seek

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pg_lo_seek

(PHP 4 >= 4.2.0, PHP 5)pg_lo_seek --

Seeks position within a large object

Описание

bool pg_lo_seek (resource large_object, int offset [, int whence])

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.

Список параметров

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)

or PGSQL_SEEK_END (seek from object end).

Возвращаемые значения

Возвращает TRUE в случае успешного завершения или FALSE в случае возникновения ошибки.

Примеры

Пример 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;
?>

Смотрите также

pg_lo_read

pg_lo_tell

Отвечу на любые вопросы. С уважением, Дмитрий Владимирович.

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