pg_lo_truncate()

(PHP 5 >= 5.6.0, PHP 7)

Truncates a large object

说明

pg_lo_truncate(resource $large_object,int $size): bool

pg_lo_truncate() truncates a large object resource.

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

参数

$large_object

PostgreSQL large object(LOB)resource, 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。

范例

Example #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;
?>

更新日志

参见

• pg_lo_tell()返回大型对象的当前指针位置