如何在按钮单击时执行mysql

Question

PHP:
单击按钮时如何执行SQL？我会使用JavaScript onClick()函数或其他方式吗？我试图在循环内执行此操作,并且仅在单击按钮的行上执行sql ...谢谢!

@PHPnoOb的代码帮助:好的,所以现在我把所有这些都整理好了,但是当点击按钮时,它会为每一行执行一次...而不是只按一次按钮被点击的行!我只想要点击按钮的行...我的代码:

while($row = mysqli_fetch_array($result)) {

//FAULTY CODE!!! EXECUTES ONCE FOR EACH ROW!
//I WANT IT TO ONLY EXECUTE FOR THE ROW THE
//BUTTON WAS CLICKED ON

if(isset($_POST['delete'])){
echo "You clicked on: ".$row['subject'];
//eventually i will have sql query up here
}
//echo all the results into a table... messy
echo"

<tr><td><div align='center'><font color='grey'>".$row['date']."</font></div></td><td><div align='center'> ".$row['sender']."</div></td><td><div align='center'> ".$row['subject']."</div></td><td><div align='center'><input type='button' value='open' onClick='window.alert(\"On ".$row['date']." ".$row['sender']." wrote:\\n".$row['message']."\")'/></div></td><td><div align='center'><form  method='post'><input type='submit' value='delete' name='delete'/></form></div></td></tr>

";

}

echo '</table>'; //ends the table.

Answer 1

Update: 2017

这个答案已经过时,请使用像PDO这样的更好的库来完成以下功能.

好的,只需将整个代码复制/粘贴到普通的PHP文本中即可.它有效,我刚刚尝试过.所有你需要的是一个名为表test,用的Fileds id,username或者你可以costumize脚本,但是你喜欢.并且不要忘记更改数据库密码,用户名详细信息..

<form action='' method='POST'>
<?php

mysql_connect('localhost', 'root', '');
mysql_select_db('test');
$query  = "SELECT * FROM users";
$result = mysql_query($query);

while ($row = mysql_fetch_array($result)) {
    echo "  To delete user   <b>" . $row['username'] . "</b>  Click on the number <input type='submit' name='delete' value='" . $row['id'] . "' /><br/>";
}

if (isset($_POST['delete'])) {
    $user = $_POST['delete'];
    $delet_query = mysql_query("DELETE FROM users WHERE id = $user ") or die(mysql_error());

    if ($delet_query) {
        echo 'user with id ' . $user . ' is removed from your table, to refresh your page, click' . '<a href=' . $_SERVER["PHP_SELF"] . ' > here </a>';
    }
}
?>
</form>

Answer 2

您可以执行类似的操作来保存输入/提交btn中的值。

<!-- your html form -->
<form action="POST">
    <input type='text' name='username' />
    <input type='text' value='submit' />
</form>



<?php 

// your php code

if($_POST && isset($_POST['username'])){

    $db = new \PDO('......'); // enter your db details

    $stmt = $db->prepare("INSERT INTO table (username) VALUES (?)");
    $result = $stmt->execute(array($_POST['username']);

    echo $result->rowCount() ? 'Username saved in db' : 'Unknown error occured'; 

}