Php/docs/function.pg-lo-truncate
来自菜鸟教程
pg_lo_truncate
(PHP 5 >= 5.6.0, PHP 7)
pg_lo_truncate — 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
| 版本 | 说明 |
|---|---|
| 5.6.0 | Added truncate function. It supports PostgreSQL 9.3's 64bit large object. Both client and server must
support PostgreSQL 9.3 and PHP must be 64bit build to use 64bit large object. |
