(PHP 4 >= 4.2.0, PHP 5)
pg_lo_create — 新建一个大型对象
$connection
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pg_lo_create() 新建一个大型对象并返回该大型对象的 oid。connection 指定了由 pg_connect() 或 pg_pconnect() 打开的有效的数据库连接号。不支持 PostgreSQL 访问模式 INV_READ，INV_WRITE 和 INV_ARCHIVE，该对象总是以读写方式访问。INV_ARCHIVE 已经从 PostgreSQL 中删除了（6.3 及以上版本）。本函数返回大型对象的 oid，如果出错则返回 FALSE。
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_locreate()。
andrea dot galli at acotel dot com (2003-05-05 10:21:04)
<?php
// --------- OPEN CONN ---
$conn = pg_connect("host='127.0.0.1' dbname='test' user='usertest' password='passtest'");
// --------- OPEN FILE ---
$fp = fopen('logo.gif', "r");
$buffer = fread($fp, filesize('logo.gif'));
fclose($fp);
// --------- CREATE - INSERT OID ---
pg_exec($conn, "begin");
$oid = pg_locreate($conn);
$rs = pg_exec($conn,"INSERT INTO test(tipo, images) VALUES('A1', $oid);");
$handle = pg_loopen ($conn, $oid, "w");
pg_lowrite ($handle, $buffer);
pg_loclose ($handle);
pg_exec($conn, "commit");
// --------- OPEN - INSERT OID ---
$rs = pg_exec($conn, "SELECT images FROM test WHERE tipo = 'A1';");
$row = pg_fetch_row($rs, 0);
pg_exec($conn, "begin");
$loid = pg_loopen($conn, $row[0], "r");
header("Content-type: image/gif");
pg_loreadall($loid);
pg_loclose($loid);
pg_exec ($conn, "commit");
// --------- UNLINK OID ---
pg_exec($conn, "begin");
$loid = $row[0];
pg_lounlink($conn, $loid);
pg_exec ($conn, "commit");
// --------- DELETE OID ---
pg_exec($conn, "DELETE FROM test WHERE tipo = 'A1';");
// --------- CLOSE CONN ---
pg_close();
?>