pg_lo_read
(PHP 4 >= 4.2.0, PHP 5)
pg_lo_read — Read a large object
Description
string pg_lo_read
( resource
$large_object
[, int $len = 8192
] )
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.
Note:
This function used to be called pg_loread().
Parameters
-
large_object -
PostgreSQL large object (LOB) resource, returned by pg_lo_open().
-
len -
An optional maximum number of bytes to return.
Return Values
A string containing len bytes from the
large object, or FALSE on error.
Examples
Example #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..."