pg_lo_export()

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

将大型对象导出到文件

说明

pg_lo_export([resource $connection],int $oid,string $pathname): bool

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()。

参数

$connection: PostgreSQL database connection resource. When$connectionis 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。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

范例

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");
?>

参见

pg_lo_import()将文件导入为大型对象