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Dokumen ini menggunakan Manual laman web PHP Cina Lepaskan
(PHP 4 >= 4.2.0, PHP 5)
pg_lo_export — 将大型对象导出到文件
$connection
], int $oid
, string $pathname
)pg_lo_export() takes a large object in a PostgreSQL database and saves its contents to a file on the local filesystem.
要使用大型对象(lo)接口,需要将其放置在事务块中。
Note:
本函数以前的名字为 pg_loexport()。
connection
PostgreSQL database connection resource. When
connection
is not present, the default connection
is used. The default connection is the last connection made by
pg_connect() or pg_pconnect() .
oid
要导出的数据库里的大型对象的 OID 。
pathname
要导出的数据库里的大型对象的文件在客户端上完整路径和文件名。
成功时返回 TRUE
, 或者在失败时返回 FALSE
。
Example #1 pg_lo_export() example
<?php
$database = pg_connect ( "dbname=jacarta" );
pg_query ( $database , "begin" );
$oid = pg_lo_create ( $database );
$handle = pg_lo_open ( $database , $oid , "w" );
pg_lo_write ( $handle , "large object data" );
pg_lo_close ( $handle );
pg_lo_export ( $database , $oid , '/tmp/lob.dat' );
pg_query ( $database , "commit" );
?>