pg_lo_export

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

pg_lo_export將大型對象導(dǎo)出到文件

說明

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.

要使用大型對象(lo)接口,需要將其放置在事務(wù)塊中。

注意:

本函數(shù)以前的名字為 pg_loexport()

參數(shù)

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

要導(dǎo)出的數(shù)據(jù)庫里的大型對象的 OID

pathname

要導(dǎo)出的數(shù)據(jù)庫里的大型對象的文件在客戶端上完整路徑和文件名。

返回值

成功時返回 true, 或者在失敗時返回 false。

范例

示例 #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");
?>

參見