array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'es', ), 'this' => array ( 0 => 'function.pg-lo-seek.php', 1 => 'pg_lo_seek', ), 'up' => array ( 0 => 'ref.pgsql.php', 1 => 'Funciones de PostgreSQL', ), 'prev' => array ( 0 => 'function.pg-lo-read.php', 1 => 'pg_lo_read', ), 'next' => array ( 0 => 'function.pg-lo-tell.php', 1 => 'pg_lo_tell', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'en', 'path' => 'reference/pgsql/functions/pg-lo-seek.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_lo_seek — Seeks position within a large object
pg_lo_seek() seeks a position within an PgSql\Lob instance.
To use the large object interface, it is necessary to enclose it within a transaction block.
lob
An PgSql\Lob instance, 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) .
Versión | Descripción |
---|---|
8.1.0 |
The lob parameter expects an PgSql\Lob
instance now; previously, a recurso was expected.
|
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;
?>