pg_lo_import

(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)

pg_lo_import — 将文件导入为大型对象

说明

pg_lo_import ( resource $connection = ? , string $pathname , mixed $object_id = ? ) : int

pg_lo_import() creates a new large object in the database using a file on the filesystem as its data source.

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_loimport()。

参数

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().
pathname: 变量指明了要导入为大型对象的文件名。
object_id: If an object_id is given the function will try to create a large object with this id, else a free object id is assigned by the server. The parameter was added in PHP 5.3 and relies on functionality that first appeared in PostgreSQL 8.1.

返回值

导入成功则返回新建的大型对象的 OID，如果出错则返回 false。

范例

Example #1 pg_lo_import() 例子


<?php
   $database = pg_connect("dbname=jacarta");
   pg_query($database, "begin");
   $oid = pg_lo_import($database, '/tmp/lob.dat');
   pg_query($database, "commit");
?>

参见

pg_lo_export() - 将大型对象导出到文件
pg_lo_open() - 打开一个大型对象

User Contributed Notes

vi2 at vi2 dot com 01-Aug-2002 05:54


its not very clear if pg_lo_import needs to have pg_lo_open called first. Because pg_lo_import handles the process of writign to the file, it seems logical that pg_lo_open does not need to be called. However due to the ugly nature of how postgres handles oid objects, it would be nice to have this documented.

yohgaki at php dot net 19-Jun-2002 06:04


Due to a bug, OLD API does not available with PHP 4.2.0 and 4.2.1.



PHP 4.2.2 will support OLD API again and will be kept long enough.



New API will be available PHP 4.2.0 to later versions.

yohgaki at php dot net 19-Jun-2002 06:00


Due to a bug, PHP 4.2.0 and 4.2.1 does not support pg_lo_import() old API. It's fixed in PHP 4.2.2.



BTW, new API will be always available from PHP 4.2.0 to later versions. Older API will be kept long enough, also.

ceco at noxis dot net 15-May-2002 11:08


it works for me (php-4.2.1)



not like this



int pg_lo_import ( string pathname [, resource connection])



but 

int pg_lo_import ( resource connection, string pathname )



don't know the reason