PHP Conference Nagoya 2025

oci_set_prefetch_lob

(PHP 8.2, PECL OCI8 >= 3.2)

oci_set_prefetch_lobSets the amount of data prefetched for each CLOB or BLOB.

Descrizione

oci_set_prefetch_lob(resource $statement, int $prefetch_lob_size): bool

Sets the internal buffer size used to fetch each CLOB or BLOB value when the implementation gets the internal Oracle LOB locator from the database after a successful query call to oci_execute() and for each subsequent internal fetch request to the database. Increasing this value can improve the performance of fetching smaller LOBs by reducing round-trips between PHP and the database. Memory usage will change.

The value affects LOBs returned as OCILob instances and also those returned using OCI_RETURN_LOBS.

Call oci_set_prefetch_lob() before calling oci_execute(). If it is not called, the value of oci8.prefetch_lob_size is used.

The LOB prefetch value should only be set with Oracle Database 12.2 or later.

Elenco dei parametri

statement

Un identificativo valido di statement OCI8 creato da oci_parse() e eseguito da oci_execute(), o un identificativo di statement REF CURSOR.

prefetch_lob_size

The number of bytes of each LOB to be prefetched, >= 0

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Esempi

Example #1 Changing the LOB prefetch value for a query

<?php

$conn
= oci_connect('hr', 'welcome', 'localhost/XE');

$stid = oci_parse($conn, 'SELECT myclob FROM mytable');
oci_set_prefetch_lob($stid, 100000); // Set before calling oci_execute()
oci_execute($stid);

echo
"<table border='1'>\n";
while (
$row = oci_fetch_array($stid, OCI_ASSOC+OCI_RETURN_NULLS+OCI_RETURN_LOBS)) {
echo
"<tr>\n";
foreach (
$row as $item) {
echo
" <td>".($item !== null ? htmlentities($item, ENT_QUOTES) : "&nbsp;")."</td>\n";
}
echo
"</tr>\n";
}
echo
"</table>\n";

oci_free_statement($stid);
oci_close($conn);

?>

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