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php登陆小疑点

日期：2014-05-17　浏览次数：20535 次

php登陆小问题
login.php

PHP code

<script type="text/javascript">
    function check()
    {
        var un = document.getElementById("username").value;
        var up = document.getElementById("userpass").value;
        if(un==""){alert("null"); return false;}
        if(up==""){alert("null");return false;}
        
    }
</script>
<body>
<form method="post" action="show.php" name="form1" onsubmit="return check()">
用户名：<input type="text" name="username" id="username" /><br />
密  码：<input type="password" name="userpass" id="userpass" /><br  />
<input type="submit" name="submit" value="登陆" />
</form>
</body>

show.php

PHP code

<?php include("conn.php"); ?>
<?php 
    if($_POST["submit"])
    {
        echo $sql ="select * from users where username='".$_POST["username"]."' and userpass='".$_POST["userpass"]."'";
        $result=mysql_query($sql);
        //echo count($result);
        
        if($result)
        {
            echo "登陆成功";
        }else
        {
            echo "不要捣乱";
        }
    }
?>

------解决方案--------------------
if($result) $result不为0则if时默认为true