停止輸入框中的空值插入到我的數據庫中？ PHP

這是HTML表單（register.php）：停止輸入框中的空值插入到我的數據庫中？ PHP

<html> 
<body> 

<form action="handle_registration.php" method="post"> 

<fieldset><legend>Enter your 
information in the form below:</legend> 

First Name: <input type="text" name="fname" size="20" maxlength="40"><br> 
Last Name: <input type="text" name="lname" size="20" maxlength="40"><br> 
Username: <input type="text" name="uname" size="20" maxlength="40"><br> 
Password: <input type="text" name="pword" size="20" maxlength="40"><br> 
<input type="submit" name="submit" value="submit my info"> 

</form> 

</body> 
</html>

這是PHP腳本處理註冊（handle_registration.php）：

<?php 

// Create a shorthand for the form data: 

$fname = $_POST['fname']; 
$lname = $_POST['lname']; 
$uname = $_POST['uname']; 
$pword = $_POST['pword']; 

// Create the connection variables: 

$db_host = "localhost"; 
$db_user = "root"; 
$db_pass = ""; 
$db_name = "registration_info"; 
$con = mysqli_connect("$db_host", "$db_user", "$db_pass", "$db_name"); 

// Check the connection: 

if (mysqli_connect_errno()) 
{ 
echo "Failed to connect to MySQL: " . mysqli_connect_error(); 
} 

// Make sure all of the input boxes have a value: 

if (empty($fname)) { 
die('You forgot to enter your first name!'); 
} 

if (empty($lname)) { 
die('You forgot to enter your last name!'); 
} 

if (empty($uname)) { 
die('You forgot to choose a username!'); 
} 

if (empty($pword)) { 
die('You forgot to choose a password!'); 
} 

// Insert the data from the form into the DB: 

$sql = "INSERT INTO basic_information (First_Name, Last_Name, Username, Password) 
VALUES 
('$_POST[fname]', '$_POST[lname]', '$_POST[uname]', '$_POST[pword]')"; 

// Enter the info the end user type if everything is ok: 

if (!mysqli_query($con,$sql)) 
{ 
die('Error: ' . mysqli_error($con)); 
} 
else 
{ 
echo "Record has been added"; 
} 

// Close the connection: 

mysqli_close($con); 

?>

這裏的問題：

如果所有輸入字段都有一個值，我想將輸入的值提交到我的數據庫中，但是當我在檢查它們是否爲空時使用了模具函數時，它會殺死腳本。如果一個或多個字段爲空，我只想要將它插入到我的數據庫中&顯示一條錯誤消息，指出哪個字段爲空。我不知道如何解決這個問題，任何幫助將不勝感激。

來源

2013-08-07 Devin Smith

引用此URL：http://www.w3schools.in/php-tutorial/form-validation/ – PravinS

1.將所有錯誤存儲在數組中。如果數組是空的，則插入數據庫，否則打印數組內容。 – FirmView

您可能會收到一些評論，告訴您注意SQL注入和安全性。這是你應該關注的一個問題。另一個問題是，檢查表單字段的來源是否是一個更好的主意，例如，通過客戶端瀏覽器中的一些JavaScript/jQuery驗證程序。這樣，您可以在出現錯誤（或缺失值）的情況下爲用戶提供更快的響應，並保持服務器不必要的流量。 – cars10m

該解決方案相當簡單。只需將錯誤消息存儲在變量中，然後再將行插入數據庫中 - 檢查天氣是否設置了錯誤或者是否爲空。如果它是空的 - 我們可以插入該行。否則 - 讓我們顯示錯誤消息。

// Currently we do not have an error 
$error = NULL; 

// Validate 
if (empty($pword)) { 
    $error = 'You forgot to choose a password!'; 
} 

// If there are no errors - lets insert 
if (!$error) { 
    $sql = 'INSERT INTO ...'; 
}

來源

2013-08-07 05:16:28 MJA

不使用模具，用一些變量來存儲錯誤，並打印出來後

<?php 

// Create a shorthand for the form data: 

$fname = $_POST['fname']; $lname = $_POST['lname']; $uname = 
$_POST['uname']; $pword = $_POST['pword']; 

// Create the connection variables: 

$db_host = "localhost"; $db_user = "root"; $db_pass = ""; $db_name = 
"registration_info"; $con = mysqli_connect("$db_host", "$db_user", 
"$db_pass", "$db_name"); 

// Check the connection: 

if (mysqli_connect_errno()) { echo "Failed to connect to MySQL: " . 
mysqli_connect_error(); } 

// Make sure all of the input boxes have a value: 

if (empty($fname)) { $error_msg[]='You forgot to enter your first name!'; } 

if (empty($lname)) { $error_msg[]='You forgot to enter your last name!'; } 

if (empty($uname)) { $error_msg[]='You forgot to choose a username!'; } 

if (empty($pword)) { $error_msg[]='You forgot to choose a password!'; } 

// Insert the data from the form into the DB: 
if(count($error_msg)==0){ 
$sql = "INSERT INTO basic_information (First_Name, Last_Name, 
Username, Password) VALUES ('$_POST[fname]', '$_POST[lname]', 
'$_POST[uname]', '$_POST[pword]')"; 

// Enter the info the end user type if everything is ok: 

if (!mysqli_query($con,$sql)) { die('Error: ' . mysqli_error($con)); } 
else { echo "Record has been added"; } 

// Close the connection: 

mysqli_close($con); 
}else{ 
print_r($error_msg); 
} 

?>

來源

2013-08-07 05:17:21 Garry

你可以使用$錯誤變量在所有領域保持錯誤

$error = array();//initializing the $error 
if (empty($fname)) { 
$error[] = 'You forgot to enter your first name!'; 
} 

if (empty($lname)) { 
$error[] = 'You forgot to enter your last name!'; 
} 

if (empty($uname)) { 
$error[] = 'You forgot to choose a username!'; 
} 

if (empty($pword)) { 
$error[] = 'You forgot to choose a password!'; 
} 

if(!empty($error))//if error occured 
{ 
    die(implode('<br />', $error));//Stops the script and prints the errors if any occured 
} 
// Insert the data from the form into the DB: 

$sql = "INSERT INTO basic_information (First_Name, Last_Name, Username, Password) 
VALUES 
('$_POST[fname]', '$_POST[lname]', '$_POST[uname]', '$_POST[pword]')"; 

// Enter the info the end user type if everything is ok: 

if (!mysqli_query($con,$sql)) 
{ 
die('Error: ' . mysqli_error($con)); 
} 
else 
{ 
echo "Record has been added"; 
} 

// Close the connection: 

mysqli_close($con);

來源

2013-08-07 05:21:42 Jithesh

停止輸入框中的空值插入到我的數據庫中？ PHP

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