(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_lo_open — 打开大对象
pg_lo_open() 打开数据库中的大对象并返回 PgSql\Lob 实例，以便对其进行操作。
在关闭 PgSql\Lob 实例之前不要关闭数据库连接。
要使用大对象接口，必须将其封装在一个事务块中。
注意:
本函数以前的名字为 pg_loopen()。
connectionAn 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数据库中大对象的 OID。
mode可以是只读的“r”、只写的“w”或读写的“rw”。
PgSql\Lob 实例， 或者在失败时返回 false。
| 版本 | 说明 |
|---|---|
| 8.1.0 | 现在返回 PgSql\Lob 实例；之前返回 resource。 |
| 8.1.0 |
现在 connection 参数接受 PgSql\Connection
实例，之前接受 resource。
|
示例 #1 pg_lo_open() 示例
<?php
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$oid = pg_lo_create($database);
echo "$oid\n";
$handle = pg_lo_open($database, $oid, "w");
echo "$handle\n";
pg_lo_write($handle, "large object data");
pg_lo_close($handle);
pg_query($database, "commit");
?>Just for the record, a user must be a superuser (database owner) in order to invoke pg_lo_open() (though pg_lo_create() may be invoked...). This opens a gigantic security hole in the db. If a user is not a superuser, db will raise an error with message "Can't create Large Object.".
Thus, imho, one should use pg_escape_bytea() instead.