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pg_lo_tell

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_lo_tell Returns current seek position a of large object

Açıklama

pg_lo_tell(PgSql\Lob $lob): int

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.

Bağımsız Değişkenler

lob

pg_lo_open()işlevinden dönen PgSql\Lob nesnesi.

Dönen Değerler

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.

Sürüm Bilgisi

Sürüm: Açıklama
8.1.0 lob bağımsız değişkeni artık PgSql\Lob nesnesi kabul ediyor, evvelce bir özkaynak kabul ederdi.

Örnekler

Örnek 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");
?>

Yukarıdaki örneğin çıktısı:

Seek position is: 50000

Ayrıca Bakınız

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User Contributed Notes 1 note

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0
Marv-CZ
13 years ago
Function to take a large object size:

<?php
function pg_lo_size ($lo) {
$pos = pg_lo_tell ($lo);
pg_lo_seek ($lo, 0, PGSQL_SEEK_END);
$size = pg_lo_tell ($lo);
pg_lo_seek ($lo, $pos, PGSQL_SEEK_SET);
return
$size;
}
?>
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