pg_lo_create

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

pg_lo_create — 新建一个大型对象

说明

pg_lo_create(resource $connection): int

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。

注意:
本函数以前的名字为 pg_locreate()。

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User Contributed Notes 1 note

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andrea dot galli at acotel dot com ¶

19 years ago


<?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();
?>

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