(PHP 4 >= 4.2.0, PHP 5)
pg_lo_open — 打开一个大型对象
$connection
, int $oid
, string $mode
)
pg_lo_open() 打开一个大型对象并返回大型对象资源号。该资源号内封装了连接号。oid 指定了有效的大型对象的 oid，mode 可以为 "r"，"w" 或者 "rw"。如果失败则返回 FALSE。
在关闭大型对象资源之前不要关闭数据库连接。
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_loopen()。
参见 pg_lo_close() 和 pg_lo_create()。
metator at netcabo dot pt (2005-08-29 11:15:12)
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.
riccardo_ridenti at hotmail dot com (2002-10-24 03:49:53)
//INSERT FILE INTO DB
$fp = fopen($filename,"r");
$buffer = fread($fp,filesize($filename));
fclose($fp);
pg_query ($conn, "begin");
$oid = pg_lo_create ($conn);
//echo "$oid\n";
$rs = pg_exec($conn,"insert into table(object) values($oid);");//object field type must be "oid"
$handle = pg_lo_open ($conn, $oid, "w");
//echo "$handle\n";
pg_lo_write ($handle, $buffer);
pg_lo_close ($handle);
pg_query ($conn, "commit"); //OR END
pg_close();
//GET BUFFER(file) FROM DB
$rs = pg_exec($conn,"select object from objects where id = xxxxxx;");
$row = pg_fetch_row($rs,0);
pg_query ($conn, "begin");
$loid = pg_lo_open($conn,$row[0], "r");
pg_lo_read_all ($loid);
pg_lo_close ($loid);
pg_query ($conn, "commit"); //OR END
pg_close();