array ( 0 => 'index.php', 1 => 'PHP Manual', ), 'head' => array ( 0 => 'UTF-8', 1 => 'zh', ), 'this' => array ( 0 => 'function.pg-lo-read.php', 1 => 'pg_lo_read', ), 'up' => array ( 0 => 'ref.pgsql.php', 1 => 'PostgreSQL 函数', ), 'prev' => array ( 0 => 'function.pg-lo-read-all.php', 1 => 'pg_lo_read_all', ), 'next' => array ( 0 => 'function.pg-lo-seek.php', 1 => 'pg_lo_seek', ), 'alternatives' => array ( ), 'source' => array ( 'lang' => 'zh', 'path' => 'reference/pgsql/functions/pg-lo-read.xml', ), ); $setup["toc"] = $TOC; $setup["toc_deprecated"] = $TOC_DEPRECATED; $setup["parents"] = $PARENTS; manual_setup($setup); ?>
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
pg_lo_read — 读取大对象
pg_lo_read() 从大对象中读取最多 length
字节的数据并以 string 返回。
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_loread()。
示例 #1 pg_lo_read() 示例
<?php
$doc_oid = 189762345;
$database = pg_connect("dbname=jacarta");
pg_query($database, "begin");
$handle = pg_lo_open($database, $doc_oid, "r");
$data = pg_lo_read($handle, 50000);
pg_query($database, "commit");
echo $data;
?>