更新查询PHP MySQL

问题描述

任何人都可以帮助我理解为什么这个更新查询不更新我的数据库中的字段？我有这个在我的PHP页面从数据库检索当前值：

Can anybody help me understand why this update query isn't updating the fields in my database? I have this in my php page to retrieve the current values from the database:

<?php

  $query = mysql_query ("SELECT * FROM blogEntry WHERE username = 'bobjones' ORDER BY id DESC");

  while ($row = mysql_fetch_array ($query))
  {
      $id = $row['id'];
      $username = $row['username'];
      $title = $row['title'];
      $date = $row['date'];
      $category = $row['category'];
      $content = $row['content'];


    ?>

这里是我的HTML表单：

Here i my HTML Form:

<form method="post" action="editblogscript.php">
ID: <input type="text" name="id" value="<?php echo $id; ?>" /><br />
Username: <input type="text" name="username" value="<?php echo $_SESSION['username']; ?>" /><br />
Title: <input type="text" name="udtitle" value="<?php echo $title; ?>"/><br />
Date: <input type="text" name="date" value="<?php echo $date; ?>"/><br />
Message: <textarea name = "udcontent" cols="45" rows="5"><?php echo $content; ?></textarea><br />
<input type= "submit" name = "edit" value="Edit!">
</form>

这里是我的'editblogscript'：

and here is my 'editblogscript':

<?php

mysql_connect ("localhost", "root", "");
mysql_select_db("blogass");

if (isset($_POST['edit'])) {

    $id = $_POST['id'];
    $udtitle = $_POST['udtitle'];
    $udcontent = $_POST['udcontent'];


    mysql_query("UPDATE blogEntry SET content = $udcontent, title = $udtitle WHERE id = $id");
}

header( 'Location: index.php' ) ;





?>

我不明白为什么它不工作。

I don't understand why it doesn't work.

推荐答案

您必须在查询中包含任何VARCHAR内容的单引号。所以你的更新查询应该是：

You have to have single quotes around any VARCHAR content in your queries. So your update query should be:

mysql_query("UPDATE blogEntry SET content = '$udcontent', title = '$udtitle' WHERE id = $id");

此外，使用POST中的内容直接更新数据库是不好的。您应该使用mysql_real_escape_string函数清理您传入的数据。

Also, it is bad form to update your database directly with the content from a POST. You should sanitize your incoming data with the mysql_real_escape_string function.

这篇关于更新查询PHP MySQL的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！