PHP页面未更新MySQL数据

PHP page not updating MySQL data

本文关键字：MySQL 数据 更新 PHP      更新时间：2023-09-26

我似乎在任何线程上都找不到问题的解决方案。我有两个页面，一个是HTML页面，然后是PHP页面。HTML页面简单地从数据库中的一列填充下拉列表。这就是它的要点：

        <head>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>
    <script>
        $(document).ready(function() {
            $('#select_site_form').submit(function(event) {
                $.ajax({
                  type: "POST",
                  url: 'project_testing.php',
                  data: { site_name: $("#site_name_id").val() },
                });
            }); // end of submit function
        }); //end of document.ready function
    </script>
    </head>
    <body>
    <form  method="POST" action="project_testing.php" id="select_site_form">
    <?php
        $username = "root";
        $password = "";
        $hostname = "localhost"; 
        //connection to the database
        $dbhandle = mysql_connect($hostname, $username, $password) 
          or die("Unable to connect to MySQL");
        $selected = mysql_select_db("database_name", $dbhandle) 
          or die("Could not select database");

        $sql = "SELECT site_name FROM table_name where site_name != ''";
        $result = mysql_query($sql);
        echo "Please select which site's information you would like to update.<br><br>";
        echo "<select name='site_name' id='site_name_id'>";
        while ($row = mysql_fetch_array($result)) {
            echo "<option value='" . $row['site_name'] . "'>" . $row['site_name'] . "</option>";
        }
        echo "</select>";
    ?>
    <input type="submit" name="submit" value="Select">
    </form>
    </body>

然后PHP回显一个HTML表单，并在文本框中填充站点信息。问题是，当我点击提交按钮时，信息是数据库被删除，除了网站的名称字段：

<head>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.1/jquery.min.js"></script>
<script>
    $(document).ready(function() {
        $('#update_info_form').submit(function(event) {
            var region = document.getElementById('region').value;
            $sql="UPDATE `internal_tracker` SET `region`= document.getElementsByName('region').value";
        }); // end of submit function
    }); //end of document.ready function
</script>
</head>
<?php
$username = "root";
$password = "";
$hostname = "localhost"; 
//connection to the database
$dbhandle = mysql_connect($hostname, $username, $password) 
  or die("Unable to connect to MySQL");
$selected = mysql_select_db("database_name",$dbhandle) 
  or die("Could not select database");
$site_name = $_POST["site_name"];
echo "Updating site information for &nbsp;&nbsp;"; echo $site_name;
//Retrieve data from database
$sql="SELECT * FROM table_name WHERE site_name='$site_name'";
$result=mysql_query($sql);
while ($row = mysql_fetch_assoc($result)) {
    echo '<form method="POST" action="project_testing.php" id="update_info_form">
        <table>
            <tr>
                <td><h3>Property Data</h3></td>
            </tr>
            <tr>
            <tr>
                <td> Region: </td><td> <input type="text" "name="region" id="region" value="'.$row['region'].'"></td>
            </tr>
            </tr>
            <tr>
                <td> Site Name: </td><td> <input type="text" name="site_name" value="'.$row['site_name'].'"></td>
            </tr>
            <tr>
                <td> Street Address: </td><td> <input type="text" name="street_address" value="'.$row['street_address'].'"></td>
            </tr>
            <tr>
                <td> City/State/Zip: </td><td> <input type="text" name="city_state_zip" value="'.$row['csz'].'"></td>
            </tr>
            <tr>
                <td> Priority Ranking: </td><td> <input type="text" name="priority_ranking" value="'.$row['priority_ranking'].'"></td>
            </tr>
      </table>
      <input type="submit" name="submit" value="Update">';
}
if(isset($_POST['submit'])) {
    $query = "UPDATE table_name SET region='".addslashes($_POST['region'])."', street_address='".addslashes($_POST['street_address'])."', csz='".addslashes($_POST['csz'])."', priority_ranking='".addslashes($_POST['priority_ranking'])."' WHERE site_name='".addslashes($_POST['site_name'])."'";
    mysql_query($query);
}
mysql_close();
?>

有人能看到我做错了什么吗？或者我是否遗漏了一些语法？我已经被这个问题困扰了一段时间。

将UPDATE查询放置在SELECT查询之前。您正在根据数据库中的信息构建表单，然后更新数据库。

按照评论者所说的去做，并防止SQL注入。

在代码的这一部分中：

if(isset($_POST['submit'])) {
    $query = "UPDATE table_name SET region='".addslashes($_POST['region'])."', street_address='".addslashes($_POST['street_address'])."', csz='".addslashes($_POST['csz'])."', priority_ranking='".addslashes($_POST['priority_ranking'])."' WHERE site_name='".addslashes($_POST['site_name'])."'";
    mysql_query($query);
}

$_POST['submit']已设置，$_POST['site_name']已设置，其他$_POST字段为空（因为您的ajax post没有发送它们）。因此，正如您所看到的，您的表更新将把那些引用的字段设置为空。

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