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

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

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 The lob parameter expects an PgSql\Lob instance now; previously, a 资源(resource) was expected.

范例

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;
?>

参见