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pg_lo_read

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_lo_readRead a large object

Descripción

pg_lo_read(PgSql\Lob $lob, int $length = 8192): string|false

pg_lo_read() reads at most length 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.

Nota:

This function used to be called pg_loread().

Parámetros

lob

An PgSql\Lob instance, returned by pg_lo_open().

length

An optional maximum number of bytes to return.

Valores devueltos

A string containing length bytes from the large object, or false on error.

Historial de cambios

Versión Descripción
8.1.0 The lob parameter expects an PgSql\Lob instance now; previously, a recurso was expected.

Ejemplos

Ejemplo #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");
   
$data pg_lo_read($handle50000);
   
pg_query($database"commit");
   echo 
$data;
?>

Ver también

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User Contributed Notes 1 note

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-2
bobahspb at gmail dot com
10 years ago
Be careful: pg_lo_export() create empty file without "begin"/"end".
See docs: "...it is necessary to enclose it within a transaction block..."
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