使用HTML表单和PHP更新MySQL数据库字段数据

时间:2014-03-28 14:29:43

标签: php html sql

所以我正在尝试使用html表单和一些PHP代码更新数据库字段,但是我无法让它工作,它抛出没有错误但不更新字段?,我不确定它是否因为我也回应网页上的那个字段?它似乎只是打印失败消息。

HTML:

<html>
    <form method="post" name="update" action="updateform.php" />

    Description:

    <input type="text"  name="description" />

            <input type="submit" name="Submit" Value="update" />
    </form>

    </html>

PHP:

<?php 
mysql_connect("localhost", "root", "*****") or die("Connection Failed"); 
mysql_select_db("Days")or die("Connection Failed"); 
$description = $_POST['description']; 
$query = "UPDATE test SET description = '$description' ";
if(mysql_query($query)){ echo "updated";} else{ echo "fail";} ?> 

我的回声(工作):

             <?php
include("include/session.php");
//connect to the server
$connect = mysql_connect("localhost","root","*****");

//connect to the database
mysql_select_db("days");

//query the database
$query = mysql_query("SELECT * FROM hobby WHERE id = '1' ");

//ferch the results / convert results into an array

    WHILE($rows = mysql_fetch_array($query)):

        $description = $rows['description'];

    echo "<div style ='font:15px/21px Arial,tahoma,sans-serif;color:#cf5c3f     </h>'>$description";
    endwhile;






?>

2 个答案:

答案 0 :(得分:1)

UPDATE table_name
SET column1=value, column2=value2,...
WHERE some_column=some_value

更新查询示例,但我没有得到你的sql ..你错过了where子句

答案 1 :(得分:0)

每当您尝试将某些内容更新为表格时,您都需要使用WHERE条件。

这是我的代码:

<强>的test.html

<html>
<form method="post" action="updateform.php" />

Name : <input type="text"  name="name" /> </br>

<input type="submit" name="Submit" value="update" />

</form>
</html>

<强> updateform.php

<?php 
$name = $_POST['name'];
$connection = mysqli_connect("localhost", "root", "Enter Passwd Here","Enter db_name here"); 
if(mysqli_connect_errno())
{
    echo "failed to connect " . mysqli_connect_error();
}

if(isset($_POST['Submit'])) 
{
    $query = "UPDATE `test_table` SET `name` = '$name' WHERE `cost` = 500"; 
    $result = mysqli_query($connection,$query); 

    if (!$result) {
    die('Error' . mysqli_error($connection));
    }
    else
    {
    echo "Successfully updated";
    }
}
?>

为了证明我已经创建了一个数据库&amp;表格test_table,包含3个字段。 (ID,姓名,成本)     
    
这是我桌子的结构:

enter image description here     
    

在执行上述脚本之前,我们的表包含此数据

enter image description here

执行脚本后,第二行中的名称ramu更改为shiva,因为我们在cost条件中将WHERE指定为500

$query = "UPDATE `test_table` SET `name` = '$name' WHERE `cost` = 500";


enter image description here