thinkphp会员登录密码验证md5有关问题

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Release： 2016-06-13 12:40:11

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thinkphp会员登录密码验证md5问题。
会员注册的时候密码md5加密存到数据库了，现在会员登录要md5密码之后去数据库查询应该怎么写？我获取表单md5后去数据库查询为什么不一样了，我的代码是

class AdminAction extends Action{<br />
       function index(){<br />
	  if(isset($_POST['username'])){<br />
	        if(isset($_POST['username'])&&isset($_POST['password'])){<br />
			    $secure_code = C('SECURE_CODE');<br />
			    $userpassword=md5($secure_code.md5($_POST["password"]));<br />
			    $db=M();<br />
				$select=$db->query("select * from developers where username=".$_POST['username']." and password=".$userpassword."");<br />
				 echo $db->getLastSql();exit;

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应该怎么写呢？

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