pg_lo_truncate

(PHP 5 >= 5.6.0, PHP 7, PHP 8)

pg_lo_truncate Truncates a large object

说明

pg_lo_truncate(PgSql\Lob $lob, int $size): bool

pg_lo_truncate() truncates an PgSql\Lob instance.

To use the large object interface, it is necessary to enclose it within a transaction block.

参数

lob

通过 pg_lo_open() 返回的 PgSql\Lob 实例。

size

The number of bytes to truncate.

返回值

成功时返回 true, 或者在失败时返回 false

更新日志

版本 说明
8.1.0 现在 lob 接受 PgSql\Lob 实例,之前接受 resource

示例

示例 #1 pg_lo_truncate() example

<?php
$doc_oid
= 189762345;
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$handle = pg_lo_open($database, $doc_oid, "r");
// Truncate to 0
pg_lo_truncate($handle, 0);
pg_query($database, "commit");
echo
$data;
?>

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