PHP/MySQL的登录系统会给出错误的MySQL错误：（）

Question

当我运行的代码我得到的MySQL错误（），我得到的错误在查询Execution.Error：问题在执行查询：

insert into kyaami_user_logins set `user_id` = '32', `email` = 'test@test2.com', `ip` = , `timestamp` = NOW(), `state` = 'success', `active`=1 

的MySQL错误：（）

<?php 
if (isset($_GET['msg'])) 
    { 
    if ($_GET['msg'] == 1) 
    echo "Invalid User. Try Again."; 
    if ($_GET['msg'] == 2) 
    echo "Account Activated Successfully."; 
    if ($_GET['msg'] == 3) 
    echo "Your Account is Locked. contact Administrator."; 
    if ($_REQUEST['msg'] == 4) 
    echo "Mail has been sent to your email address."; 
    if ($_REQUEST['msg'] == 5) 
    echo "Your Account is already activated, Login Here"; 
    if ($_REQUEST['msg'] == 6) 
    echo "Your Activation link has been expired, please register again"; 
    } 
?> 
</span></td> 
</tr> 
<tr> 
    <td width="70" align="right" valign="top"><p class="form_text" style="color:#FFF;" align="right"><strong>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Email</strong></p></td> 
    <td width="410"><div class="form_input_BG"><input type="text" name="username" id="username" value=""/></div></td> 
</tr> 
<tr> 
    <td valign="top"><p class="form_text" style="margin-left:8px; color:#FFF;"><strong>Password</strong></p></td> 
    <td align="left"><div class="form_input_BG"><input type="password" name="pwd" id="pwd" value=""/></div> 
    </td> 
</tr> 
<tr> 
    <td>&nbsp;</td> 
    <td>&nbsp;&nbsp;<strong><a href="index.php?page=forgot_pwd" >Forgot your password?</a></strong></td> 
</tr> 
<tr> 
    <td>&nbsp;</td> 
    <td><div class="form_login_signup_btn"> 
<input title="login Now" type="image" src="images/login_btn.png" name="formSubmit" id="login" width="104" height="33" /> <!--<input type="image" src="images/signup_btn.png" title="Signup Now" name="signup" id="signup" />-->&nbsp;&nbsp;<a href="fbconnect.php"><img src="images/fconnect-but.gif" width="89" height="21" border="0"></a> &nbsp;&nbsp;<a href="twit_redirect.php"><img src="images/sign-in-with-twitter.png" width="151" height="24" alt="Sign in with Twitter" border="0" /></a> 
    </div> 
    </td> 
</tr> 
</table> 
</div> 
</div> 
</div> 
<div class="clr"></div></div> 
<div class="clr"></div> 
</div> 
</form> 

Answer 1

应当IP = ''

insert into kyaami_user_logins set `user_id` = '32', `email` = 'test@test2.com', `ip` = '', `timestamp` = NOW(), `state` = 'success', `active`=1 

ip = ,导致错误。如果值为空，则将其更正为ip = ''。

Answer 2

要插入一个空白：

insert into kyaami_user_logins 
    set `user_id` = '32', 
    `email` = 'test@test2.com', 
    `ip` = , 
    `timestamp` = NOW(), 
    `state` = 'success', 
    `active`=1 

如果要插入一个空值使用此：

insert into kyaami_user_logins 
    set `user_id` = '32', 
    `email` = 'test@test2.com', 
    `ip` = null, 
    `timestamp` = NOW(), 
    `state` = 'success', 
    `active`=1 

而且，通常插入的语法如下：

insert into kyaami_user_logins 
    (`user_id`, `email`, `ip`, `timestamp`, `state`, `active`) 
    values ('32', 'test@test2.com', null, NOW(), 'success', 1) 

这个方法将会在对表进行更改后存活下来，并且实际上可以通过命名该列完全跳过IP部分NS（如果默认设置为无论如何空）是这样的：

insert into kyaami_user_logins 
    (`user_id`, `email`, `timestamp`, `state`, `active`) 
    values ('32', 'test@test2.com', NOW(), 'success', 1) 

Answer 3

为了避免这样的错误，尝试更改您的代码PDO：

$db = new PDO('mysql:host=localhost;dbname=testdb;charset=UTF-8', 'username', 'password', array(PDO::ATTR_EMULATE_PREPARES => false, PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION)); 

$stmt = $db->prepare("INSERT INTO `kyaami_user_logins`(`user_id`, `email`, `timestamp`, `state`, `active`, `ip`) VALUES (:user_id, :email, NOW(), :state, 1, :ip)"); 
$stmt->execute(array(':user_id' => 32, ':email' => 'test@test2.com', ':state' => 'success', ':ip'=>''));