Load data from MySQL database to HTML textboxes on

2020-02-26 02:35发布

站内问答 / PHP
824 1 6

I have a small form for updating existing records.

enter image description here

I'm loading the Service IDs to the dropdown box using PHP. And when the user clicks the Load button, it is supposed to display the other details related to that ID in the textboxes below. Here is the code I have so far.

<html>
<head>
</head>
<body>

<?php
//Database initialization
require_once("db_handler.php");

$conn = iniCon();
$db = selectDB($conn);

$query = "SELECT * FROM taxi_services ORDER BY SID";
$result2 = mysql_query($query, $conn);

?>

<div id="upserv">
<b id="caption2">Update location</b>
<br/><br/>
    <form name="upServForm" action="<?php echo $PHP_SELF; ?>" method="post" >
        <?php
        $dropdown = "<select name='codes'>";
        while($row = mysql_fetch_assoc($result2)) 
        {
            $dropdown .= "\r\n<option value='{$row['SID']}'>{$row['SID']}</option>";
        }
        $dropdown .= "\r\n</select>";
    ?>
     Service ID  <?php echo $dropdown; ?> <input type="submit" value="Load" name="loadbtn">
        <table width="300" border="0">
          <tr>
            <td>Name</td>
            <td><input type="text" name="upName" style="text-align:right" value="<? echo $savedName; ?>" /></td>
          </tr>
          <tr>
            <td>Cost</td>
            <td><input type="text" name="upCost" style="text-align:right" value="<? echo $savedCost; ?>" /></td>
          </tr>
          <tr>
            <td>Active</td>
            <td><input type="checkbox" name="upActive" value="<? echo $savedActive; ?>" /></td>
          </tr>
        </table>
</div>
<br/>
<div id="buttons">
    <input type="reset" value="Clear" /> <input type="submit" value="Save" name="updatebtn" />
</div>
    </form>

<?php

if(isset($_POST["loadbtn"]))
{
    $id = $_POST["codes"];

    $query = "SELECT Name, Cost, Active FROM taxi_services WHERE SID = '$id' ";
    $result = mysql_query($query, $conn);
    $details = mysql_fetch_array($result);

    $savedName = $details["Name"];
    $savedCost = $details["Cost"];
    $savedActive = $details["Active"];
}

?>

</body>
</html>

The query gets executed just fine but the data doesn't get displayed in the textboxes. Can anyone please tell me what I am missing here?

Thank you.

标签： php mysql html
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1条回答
可以哭但决不认输i
2楼-- · 2020-02-26 02:53

Your query has to be before the output:

Also note the typecast (integer) of the id to secure against sql injections.

Also note the security issues with $PHP_SELF http://php.about.com/od/learnphp/qt/_SERVER_PHP.htm I changed the code to $_SERVER['SCRIPT_NAME']

ALso note to not use register_globals and disable it in the configuration if you can (use $_SERVER['SCRIPT_NAME'] instead of$SCRIPT_NAME`) : http://www.php.net/manual/en/security.globals.php

If you learn php from a book and this is based on sourcecode out of this book you should throw it away immediately.

<?php

//Database initialization
require_once("db_handler.php");

$conn = iniCon();
$db = selectDB($conn);

$query = "SELECT * FROM taxi_services ORDER BY SID";
$result2 = mysql_query($query, $conn);

if(isset($_POST["loadbtn"]))
{
    $id = (integer) $_POST["codes"];

    $query = "SELECT Name, Cost, Active FROM taxi_services WHERE SID = '$id' ";
    $result = mysql_query($query, $conn);
    $details = mysql_fetch_array($result);

    $savedName = $details["Name"];
    $savedCost = $details["Cost"];
    $savedActive = $details["Active"];
}

?>

<html>
<head>
</head>
<body>

<div id="upserv">
<b id="caption2">Update location</b>
<br/><br/>
    <form name="upServForm" action="<?php echo $_SERVER['SCRIPT_NAME']; ?>" method="post" >
        <?php
        $dropdown = "<select name='codes'>";
        while($row = mysql_fetch_assoc($result2)) 
        {
            $dropdown .= "\r\n<option value='{$row['SID']}'>{$row['SID']}</option>";
        }
        $dropdown .= "\r\n</select>";
    ?>
     Service ID  <?php echo $dropdown; ?> <input type="submit" value="Load" name="loadbtn">
        <table width="300" border="0">
          <tr>
            <td>Name</td>
            <td><input type="text" name="upName" style="text-align:right" value="<? echo $savedName; ?>" /></td>
          </tr>
          <tr>
            <td>Cost</td>
            <td><input type="text" name="upCost" style="text-align:right" value="<? echo $savedCost; ?>" /></td>
          </tr>
          <tr>
            <td>Active</td>
            <td><input type="checkbox" name="upActive" value="<? echo $savedActive; ?>" /></td>
          </tr>
        </table>
</div>
<br/>
<div id="buttons">
    <input type="reset" value="Clear" /> <input type="submit" value="Save" name="updatebtn" />
</div>
    </form>

</body>
</html>
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