Seeks position within a large object

Descripción

pg_lo_seek ( resource $large_object , int $offset [, int $whence = PGSQL_SEEK_CUR ] ) : bool

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.

Parámetros

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) .

Valores devueltos

Devuelve TRUE en caso de éxito o FALSE en caso de error.

Ejemplos

Ejemplo #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;
?>

Historial de cambios

Versión	Descripción
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.

Ver también

pg_lo_tell() - Returns current seek position a of large object