Home Backend Development PHP Tutorial 备份数据库代码在本地有效,上传到服务器就无效,咋回事?

备份数据库代码在本地有效,上传到服务器就无效,咋回事?

Jun 13, 2016 pm 12:10 PM
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备份数据库代码在本地有效,上传到服务器就无效,怎么回事??
很奇怪,为什么在本地测试时,下面的代码可以用,但是上传到服务器就无效了?????
// 备份数据库
require('includes/config.php');
// 这里的账号、密码、名称都是从页面传过来的
$user_id = isset($_REQUEST['id']) ? intval(trim($_REQUEST['id'])) : 1;
if (!mysql_connect($db_host, $db_user, $db_pass)) // 连接mysql数据库
{
    echo '数据库连接失败,请核对后再试';
    exit;

if (!mysql_select_db($db_name)) // 是否存在该数据库
{
    echo '不存在数据库:' . $db_name . ',请核对后再试';
    exit;

mysql_query("set names 'utf8'");
$mysql = "set names utf8;\r\n";
$q1 = mysql_query("show tables");
while ($t = mysql_fetch_array($q1))
{
    $table = $t[0];
    $q2 = mysql_query("show create table `$table`");
    $sql = mysql_fetch_array($q2);
    $mysql .= $sql['Create Table'] . ";\r\n";
    $q3 = mysql_query("select * from `$table`");
    while ($data = mysql_fetch_assoc($q3))
    {
        $keys = array_keys($data);
        $keys = array_map('addslashes', $keys);
        $keys = join('`,`', $keys);
        $keys = "`" . $keys . "`";
        $vals = array_values($data);
        $vals = array_map('addslashes', $vals);
        $vals = join("','", $vals);
        $vals = "'" . $vals . "'";
        $mysql .= "insert into `$table`($keys) values($vals);\r\n";
    }
}
 
$filename = $db_name . "_" . date('Y-m-d',time()) . ".sql"; //存放路径,默认存放到项目最外层
$file="my_sql/".$filename;
$fp = fopen((dirname(__FILE__))."\\"."my_sql\\".$filename, 'w');
fputs($fp, $mysql);

if (file_exists($file))
{
header('Content-Description: File Transfer');
header('Content-Type: application/octet-stream');
header('Content-Disposition: attachment; filename='.basename($file));
header('Content-Transfer-Encoding: binary');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Pragma: public');
header('Content-Length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
}

fclose($fp);
?>
------解决思路----------------------
没有提示,可能是没有打开错误显示
你可以在每步结束的地方主动地输出点什么,基本就可判断出问题出在哪了

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