pg_lo_read
(PHP 4 >= 4.2.0, PHP 5)
pg_lo_read — Read a large object
Описание
string pg_lo_read
( resource $large_object
[, int $len
] )
pg_lo_read() reads at most len bytes from a large object and returns it as a string.
To use the large object interface, it is necessary to enclose it within a transaction block.
Замечание: This function used to be called pg_loread().
Список параметров
- large_object
-
PostgreSQL large object (LOB) resource, returned by pg_lo_open().
- len
-
An optional maximum number of bytes to return. Defaults to 8192.
Возвращаемые значения
A string containing len bytes from the large object, or FALSE on error.
Примеры
Пример #1 pg_lo_read() example
<?php
$doc_oid = 189762345;
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$handle = pg_lo_open($database, $doc_oid, "r");
$data = pg_lo_read($handle, 50000);
pg_query($database, "commit");
echo $data;
?>
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Коментарии
Be careful: pg_lo_export() create empty file without "begin"/"end".See docs: "...it is necessary to enclose it within a transaction block..."