Question

我正在使用此代码从mysql查询中获取数据。

    if ($filter == "All" && $filter != "") {date_default_timezone_set('America/Denver');
$todays123 = date("Y-m-d H:i");
$query = "SELECT * FROM events WHERE events.name LIKE '%".$search."%' AND events.user = '".$_SESSION['username']."' AND events.end > '".$todays123."'";
}else{ $todays123 = date("Y-m-d H:i");
$query = "SELECT * FROM events WHERE  events.name LIKE '%".$search."%'   AND events.price = '".$filter."' AND events.user = '".$_SESSION['username']."' AND events.end > '".$todays123."' OR events.description LIKE '%".$search."%'    AND events.price = '".$filter."' AND events.user = '".$_SESSION['username']."' AND events.end > '".$todays123."' OR events.user = '".$_SESSION['username']."' AND events.address LIKE '%".$search."%'   AND events.price = '".$filter."' AND events.end > '".$todays123."'  ";
}

这是我的javascript代码

function user_display() {

var search = document.getElementById("search").value;

if (search == "" || search == null) {
    search="";
} 

var filter = document.getElementById("filter").value;

if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari
    xmlhttp=new XMLHttpRequest();
} else {// code for IE6, IE5
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
}

xmlhttp.onreadystatechange=function() {
    if (xmlhttp.readyState==4 && xmlhttp.status==200) {
        document.getElementById("table-content").innerHTML=xmlhttp.responseText;            
    }
}
    xmlhttp.open("GET","./xxx.php?action=display&search="+search+"&filter="+filter, true);
xmlhttp.send();

}

当搜索值不包含“＆amp;”时，它会正确匹配和一个“＃。”当我输入＆符号或哈希符号时，查询崩溃并且不显示任何内容。

有关为何这样做的任何建议？提前致谢

Answer 1

您可能应该在JavaScript中使用encodeURIComponent()。很可能你没有得到结果，因为它没有在搜索变量中传递任何东西（或者将其剪掉）。考虑搜索是否为“a＆amp; foo = c＆amp;”。您请求的网址现在为xxx.php?action=display&search=a&foo=c&filter=...，因此您最终得到了另一个名为foo的GET变量

var search = encodeURIComponent(document.getElementById("search").value);

filter如果是用户将提供的内容，请执行相同操作。

Answer 2

将您的代码更改为至少这样

 $search = mysql_real_escape_string($search);
 $filter = mysql_real_escape_string($filter);
 // hopefully username in $_SESSION is clean else repeat above for that and rerun your query 
 if ($filter == "All" && $filter != "") {date_default_timezone_set('America/Denver');
 $todays123 = date("Y-m-d H:i");
 $query = "SELECT * FROM events WHERE events.name LIKE '%".$search."%' AND events.user = '".$_SESSION['username']."' AND events.end > '".$todays123."'";
 }else{ $todays123 = date("Y-m-d H:i");
$query = "SELECT * FROM events WHERE  events.name LIKE '%".$search."%'   AND events.price =   '".$filter."' AND events.user = '".$_SESSION['username']."' AND events.end >   '".$todays123."' OR events.description LIKE '%".$search."%'    AND events.price =  '".$filter."' AND events.user = '".$_SESSION['username']."' AND events.end >  '".$todays123."' OR events.user = '".$_SESSION['username']."' AND events.address LIKE  '%".$search."%'   AND events.price = '".$filter."' AND events.end > '".$todays123."'  ";
  }

上述更改至少可以确保可以避免SQL注入。

＆符号和哈希崩溃我的MYSQL查询

2 个答案: