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pg_lo_truncate — Truncates a large object
$large_object
, int $size
)pg_lo_truncate() truncates a large object resource.
To use the large object interface, it is necessary to enclose it within a transaction block.
large_object
PostgreSQL large object (LOB) resource, returned by pg_lo_open() .
size
The number of bytes to truncate.
成功时返回 TRUE
, 或者在失败时返回 FALSE
。
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 ;
?>
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. |