PHP 5.4.36 Released

pg_lo_tell

(PHP 4 >= 4.2.0, PHP 5)

pg_lo_tell Returns current seek position a of large object

Descrierea

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.

Parametri

large_object

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

Valorile întoarse

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.

Exemple

Example #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($handle50000PGSQL_SEEK_SET);
   
// See how far we've skipped
   
$offset pg_lo_tell($handle);
   echo 
"Seek position is: $offset";
   
pg_query($database"commit");
?>

Exemplul de mai sus va afișa:

Seek position is: 50000

Istoria schimbărilor

Versiunea Descriere
5.6.0 Added PostgreSQL 9.3's 64bit large object support. Both client and server must support PostgreSQL 9.3 and PHP must be 64bit build to use 64bit large object.

Vedeți de asemenea

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User Contributed Notes 1 note

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Marv-CZ
4 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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