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pg_lo_tell (PHP 4 >= 4.2.0, PHP 5) pg_lo_tell --
Returns current seek position a of large object
Описаниеint 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");
?>
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Результат выполнения данного примера: |
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