我有一个PHP脚本,可以生成一个HTML表单供用户上传文件。我使用move_uploaded_file
将该文件保存在服务器上,然后使用fgets()
读取它,并根据特定检查执行数据库插入。这是代码的简化版本:
$cart_id = 18566;
if (empty($_POST))
{
echo "<form name=\"upload\" action=\"myscan.php\" id=\"myScan\" method=\"POST\" enctype=\"multipart/form-data\">";
echo "Choose the file to upload:<br>\r\n";
echo "<input type=\"hidden\" name=\"MAX_FILE_SIZE\" value=\"300000\" form=\"myScan\" />";
echo "<input type=\"file\" name=\"file\" form=\"myScan\" id=\"fileUp\" /><br>";
echo "<input type=\"submit\" value=\"Upload\" name=\"sub\" form=\"myScan\" />";
echo "<input type=\"hidden\" name=\"ck\" form=\"myScan\" value=\"".$cart_id."\" />";
echo "</form><br>";
}
else
{
// link to cart goes here
}
$fname = "1SCAN20131031123456";
if (!empty($_POST))
{
$allowedExts = array("txt", "csv");
$extension = end(explode(".", $_FILES["file"]["name"]));
if ( ($_FILES["file"]["type"] == "text/plain"
|| $_FILES["file"]["type"] == "application/vnd.ms-excel")
&& array_search(strtolower($extension), array_map('strtolower', $allowedExts)) !== FALSE )
{
if ($_FILES["file"]["error"] > 0)
{
echo "Error: " . $_FILES["file"]["error"] . "<br>";
}
else
{
echo "Upload: " . $_FILES["file"]["name"] . "<br>";
echo "Type: " . $_FILES["file"]["type"] . "<br>";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " kB<br>";
echo "Stored in: " . $_FILES["file"]["tmp_name"]."<br>";
if (file_exists("upload/" . $_FILES["file"]["name"]))
{
echo $_FILES["file"]["name"] . " already exists. ";
}
else
{
move_uploaded_file($_FILES["file"]["tmp_name"], $fname);
echo "Moved to: " . $fname . "<br>";
}
}
}
else
{
echo "Invalid file<br>";
echo "Type: " . $_FILES["file"]["type"] . "<br>";
echo "Upload: " . $_FILES["file"]["name"] . "<br>";
echo "Extension: " . $extension . "<br>\n";
}
此时文件$fname
没问题,没有重复的行。下一部分被称为在同一PHP文件中声明的函数。 $link
,$fname
和$cart_id
被声明为全局
$bn = basename($fname);
$sfd = fopen($fname, "r");
$store_number = "$bn[0]";
if(is_numeric($bn[1]))
$store_number .= $bn[1];
$a = stripos($bn, "SCAN");
$a += 4;
$dt = substr($bn, $a);
// echo "Date = $dt \n";
$fy = substr($dt, 0, 4);
$fM = substr($dt, 4, 2);
$fd = substr($dt, 6, 2);
$fh = substr($dt, 8, 2);
$fm = substr($dt, 10, 2);
$fs = substr($dt, 12, 2);
$fdate = "$fy-$fM-$fd $fh:$fm:$fs";
// echo $fname . ",";
// echo $store_number . ",";
while ($line = fgets($sfd))
{
$li = explode(",", $line);
if (sizeof($li) == 5)
{
$scan = $li[0];
$poQty = $li[1];
$cntQty = $li[2];
$limd = $li[3];
$lihms = $li[4];
$query = "INSERT INTO upload_datalog (file_name, store, filedate, scan, po_qty, cnt_qty, scan_md, scan_hms, cart_id)\n"
. "VALUES (\"$bn\", $store_number, \"$fdate\", \"$scan\", $poQty, $cntQty, \"$limd\", \"$lihms\", $cart_id)";
mysqli_query($link, $query);
}
else if ($fM < 8 || ($fM == 8 && $fd < 16 ))
{
$scan = $li[0];
$poQty = $li[2];
$cntQty = $li[1];
$limd = $li[3];
$lihms = $li[4];
$query = "INSERT INTO upload_datalog (file_name, store, filedate, scan, po_qty, cnt_qty, scan_md, scan_hms, cart_id)\n"
. "VALUES (\"$bn\", $store_number, \"$fdate\", \"$scan\", $poQty, $cntQty, \"$limd\", \"$lihms\", $cart_id)";
mysqli_query($link, $query);
}
else if (sizeof($li) == 3 && $li[0] != "" && $li[1] != "" &&$li[2] != "" )
{
$scan = $li[0];
$poQty = $li[2];
$cntQty = $li[1];
$query = "INSERT INTO upload_datalog (file_name, store, filedate, scan, po_qty, cnt_qty)\n"
. "VALUES (\"$bn\", $store_number, \"$fdate\", \"$scan\", $poQty, $cntQty)";
mysqli_query($link, $query);
}
}
fclose($sfd);
该文件包含以下信息:
这一切都超过99%的时间,但在过去两周内两次,upload_datalog
表中的条目已被复制。此后还有另一个函数,它还会读取文件并根据不同的检查执行插入,并且这些函数也是重复的。
我知道这是一个边缘案例,但我找不到任何关于为什么会在php.net或谷歌上发生这种情况的信息,而且我无法重现它mysqlf。但我知道它发生在野外。
我在这里看不到竞争条件吗?
答案 0 :(得分:1)
你在while循环中进行插入,所以你在那个循环中运行两次? 对于调试,在循环中添加一个计数器并创建一个小的调试函数和一个调试表。将计数器和数据插入调试表中。将这些值与您的期望进行比较