我有一个奇怪的问题。我有一个带有 PHP 代码的 HTML 页面，可将数据插入 MySQL 数据库。数据被保存到数据库中，没有任何错误，但顺序不正确。
这是一个屏幕截图。右侧的表格显示现有记录。前 2 条记录显示正确。
但是当我保存更多记录时，它会显示为这样。
即使在 MySQL 表中，记录也是以这种方式插入的。
我不确定问题到底出在哪里，所以我展示了下面页面的整个代码。我已经评论了每个代码块的作用。如果您需要我澄清一些事情，请发表评论。
位置 ID是自动生成的代码。
<html>
<head>
<script language="javascript">
function SelectAll(source)
{ //The code for the 'Select All' checkbox
checkboxes = document.getElementsByTagName("input");
for(var i in checkboxes)
{
if(checkboxes[i].type == 'checkbox')
{
checkboxes[i].checked = source.checked;
}
}
}
</script>
</head>
<body>
<?php
//Database connection initialization
require_once("db_handler.php");
$conn = iniCon();
$db = selectDB($conn);
/* Generating the new Location ID */
$query = "SELECT LID FROM locations ORDER BY LID DESC LIMIT 1";
$result = mysql_query($query, $conn);
$row = mysql_fetch_array($result);
$last_id = $row['LID'];
$id_letter = substr($last_id, 0, 1);
$id_num = substr($last_id, 1) + 1;
$id_num = str_pad($id_num, 3, "0", STR_PAD_LEFT);
//$id_num = sprintf("%03d", $id_num);
$new_id = $id_letter . $id_num;
/* Displaying the exsisting locations */
$query = "SELECT * FROM locations";
$result = mysql_query($query, $conn);
$count = mysql_num_rows($result);
?>
<! The table which displays the existing records >
<div id="display">
<b>Locations</b><br/><br/>
<form name="displayLocs" action="<?php echo $PHP_SELF; ?>" method="post" >
<table border="1">
<tr>
<th>Location ID</th>
<th>Code</th>
<th>Location</th>
<th><i>Delete</i></th>
</tr>
<?php
while($row = mysql_fetch_array($result))
{
?>
<tr>
<td align="center"><? echo $row["LID"]; ?></td>
<td align="center"><? echo $row["Code"]; ?></td>
<td><? echo $row["Location"]; ?></td>
<td align="center"><input type="checkbox" name="checkbox[]" value="<? echo $row["LID"]; ?>" /></td>
</tr>
<?php
}
?>
</table>
<br/>
<div id="buttons2">
<input type="checkbox" onclick="SelectAll(this)" />Select All <input type="reset" value="Clear" /> <input type="submit" value="Delete" name="deletebtn" />
</div>
</form>
</div>
<! New record saving area >
<b id="loc_caption_1">Enter a new location</b>
<div id="loca">
<form name="locForm" action="<?php echo $PHP_SELF; ?>" method="post" >
<table width="300" border="0">
<tr>
<td>Location ID</td>
<td><input type="text" name="lid" readonly="readonly" value="<?php echo $new_id; ?>" style="text-align:right" /></td>
</tr>
<tr>
<td>Code</td>
<td><input type="text" name="code" style="text-align:right" /></td>
</tr>
<tr>
<td>Location</td>
<td><input type="text" name="loc" style="text-align:right" /></td>
</tr>
</table>
</div>
<br/>
<div id="buttons">
<input type="reset" value="Clear" /> <input type="submit" value="Save" name="savebtn" />
</div>
</form>
<?php
//Saving record
if(isset($_POST["savebtn"]))
{
$id = $_POST["lid"];
$code = $_POST["code"];
$location = $_POST["loc"];
$query = "INSERT INTO locations(LID, Code, Location) VALUES('$id', '$code', '$location')";
$result = mysql_query($query, $conn);
if (!$result)
{
die("Error " . mysql_error());
}
else
{
echo "<br/><br/>";
echo "<strong>1 record added successfully!</strong>";
echo "<meta http-equiv=\"refresh\" content=\"3;URL=locations.php\">";
}
mysql_close($conn);
}
//Deleting selected records
if(isset($_POST["deletebtn"]))
{
for($i = 0; $i < $count; $i++)
{
$del_id = $_POST["checkbox"][$i];
$query = "DELETE FROM locations WHERE LID = '$del_id' ";
$result = mysql_query($query, $conn);
}
if (!$result)
{
die("Error " . mysql_error());
}
else
{
echo "<meta http-equiv=\"refresh\" content=\"0;URL=locations.php\">";
}
mysql_close($conn);
}
?>
</body>
</html>
谁能告诉我是什么原因造成的以及如何纠正它。
谢谢你。