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(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_lo_export — 将大型对象导出到文件
pg_lo_export() 在 PostgreSQL 数据库中获取一个大对象并将其内容保存到本地文件系统上的文件中。
要使用大型对象(lo)接口,需要将其放置在事务块中。
注意:
本函数以前的名字为 pg_loexport()。
connection
An PgSql\Connection instance.
When connection
is unspecified, the default connection is used.
The default connection is the last connection made by pg_connect()
or pg_pconnect().
As of PHP 8.1.0, using the default connection is deprecated.
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。
版本 | 说明 |
---|---|
8.1.0 |
现在 connection 参数接受 PgSql\Connection
实例,之前接受 resource。
|
示例 #1 pg_lo_export() 示例
<?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");
?>