pg_lo_truncate
(PHP 5 >= 5.6.0, PHP 7, PHP 8)
pg_lo_truncate — Truncates a large object
說明
pg_lo_truncate() truncates an PgSql\Lob instance.
To use the large object interface, it is necessary to enclose it within a transaction block.
參數
-
lob 通過 pg_lo_open() 返回的 PgSql\Lob 實例。
-
size The number of bytes to truncate.
返回值
成功時返回 true， 或者在失敗時返回 false。
更新日誌
| 版本 | 說明 |
|---|---|
| 8.1.0 | 現在 lob 接受 PgSql\Lob 實例，之前接受 資源(resource)。 |
範例
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;
?> 參見
- pg_lo_tell() - 返回大型對象的目前指針位置