PHP Unconference Europe 2015

pg_lo_export

(PHP 4 >= 4.2.0, PHP 5)

pg_lo_export将大型对象导出到文件

说明

bool pg_lo_export ([ resource $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()

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().

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

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