更新聲明不適用於我的php代碼

Question

我正在爲一個學校項目創建一個在線移動重裝站點。但似乎我的更新聲明不起作用......但我認爲它的寫法是正確的，所以我無法弄清楚我的代碼中有什麼問題。

我的代碼是..當用戶嘗試重新加載他的帳戶時，balance_table中的餘額列必須更新。

這裏是我的代碼： reloadaccount.php

<?php 
if(!isset($_POST['send'])) 
{ 
    $usernumber = "09392316162"; 
    mysql_connect("localhost", "root", ""); 
    mysql_select_db("eloadretailer_db"); 
    $query0 = "SELECT * FROM `balance_table` WHERE `user_number` = $usernumber"; 
    $result = mysql_query($query0); 
    echo"<form method='post' action='".$_SERVER['PHP_SELF']."'>"; 
    while($row = mysql_fetch_array($result)) 
    { 
     $balance = $row['balance']; 
    } 
    echo"<input type='hidden' name='balance' value='".$row['balance']."' />"; 
    echo"<p>&nbsp;</p>"; 
    echo"<p>"; 
    echo"<label for='creditcardtype'>Credit Card Type: </label>"; 
    echo"<select name='creditcardtype' id='creditcardtype'>"; 
    echo"<option selected='selected'>Choose Credit Card</option>"; 
    echo"<option>Master Card</option>"; 
    echo"<option>Visa</option>"; 
    echo"</select>&nbsp;&nbsp;<img src='pics/creditcard.jpg' >"; 
    echo"</p>"; 
    echo"<p>"; 
    echo"<label for='creditcardnumber'>Credit Card Number: </label>"; 
    echo"<input type='text' name='creditcardnumber' id='creditcardnumber' />"; 
    echo"</p>"; 
    echo"<p>Expiration Date: &nbsp;&nbsp;"; 
    echo"<label for='month'>Month: </label>&nbsp;"; 
    echo"<select name='month' id='month'>"; 
    echo"<option selected='selected'>Month</option>"; 
    echo"<option>January</option>"; 
    echo"<option>February</option>"; 
    echo"<option>March</option>"; 
    echo"<option>April</option>"; 
    echo"<option>May</option>"; 
    echo"</select>"; 
    echo"<label for='year'>Year: </label>&nbsp;"; 
    echo"<select name='year' id='year'>"; 
    echo"<option selected='selected'>Year</option>"; 
    echo"<option>2020</option>"; 
    echo"<option>2019</option>"; 
    echo"<option>2018</option>"; 
    echo"<option>2017</option>"; 
    echo"<option>2016</option>"; 
    echo"<option>2015</option>"; 
    echo"<option>2014</option>"; 
    echo"<option>2013</option>"; 
    echo"</select>"; 
    echo"</p>"; 
    echo"<p>"; 
    echo"<label for='billingaddress'>Billing Address: </label>"; 
    echo"<textarea name='billingaddress' cols='40' id='billingaddress'>Billing Name, Street Address, City</textarea>"; 
    echo"</p>"; 
    echo"<p>"; 
    echo"<label for='zipcode'>Zip Code: </label>"; 
    echo"<input type='text' name='zipcode' id='zipcode' />"; 
    echo"</p>"; 
    echo"<p>"; 
    echo"<label>Amount to Load:"; 
    echo"<select name='amount' id='amount'>"; 
    echo"<option>Amount</option>"; 
    echo"<option value='100'>100</option>"; 
    echo"<option value='500'>500</option>"; 
    echo"<option value='1000'>1000</option>"; 
    echo"<option value='2000'>2000</option>"; 
    echo"<option value='3000'>3000</option>"; 
    echo"<option value='5000'>5000</option>"; 
    echo"</select>"; 
    echo"</label>"; 
    echo"</p>"; 
    echo"<p>&nbsp;</p>"; 
    echo"<p>"; 
    echo"<input type='submit' name='send' id='sendtransaction' value='Send Transaction' />"; 
    echo"</p>"; 
    echo"</form>"; 
} 
else 
{ 
    $connection = mysql_pconnect("localhost", "root", "") or die(mysql_error()); 
    mysql_select_db("eloadretailer_db") or die(mysql_error()); 

    $usernumber = "09392316162"; // its data type is varchar because if its int, 0 cannot be place before number 9 

    $balance = mysql_real_escape_string($_POST['balance']); 

    $amount = mysql_real_escape_string($_POST['amount']); 
    $totalbalance = $balance+$amount; 
    echo"balance = $totalbalance"; // $totalbalance is working... 

    //the data type of balance is int 
     //and user_number is varchar       
    $query = "UPDATE `balance_table` SET `balance`= $totalbalance WHERE `user_number` = $usernumber"; // this code is not working.. i dont know why... 

    mysql_query($query)or mysql_error(); 
} 
?> 

Answer 1

首先你打印查詢，如果查詢分析器上運行您的查詢分析器運行查詢是正確的，我認爲在條件

 $query = "UPDATE `balance_table` 
      SET 
      `balance`= $totalbalance 
      WHERE 
      `user_number` = '".$_SESSION['cart']['session_id']."'"; 

Answer 2

as user_number is varchar你應該把它放在引號中。

您的查詢應該是

$query = "UPDATE `balance_table` SET `balance`= $totalbalance 
      WHERE `user_number` = '".$usernumber."'";