Question

我正在使用GET方法从url中检索值，然后使用if语句确定它们是否存在，然后针对数据库查询它们以仅显示与它们匹配的项目，我的请求会出现未知错误。这是我的代码

$province = $_GET['province'];
$city = $_GET['city'];

if(isset($province) && isset($city) ) {         
  $results3 = mysql_query("SELECT * 
                            FROM generalinfo 
                           WHERE province = $province 
                             AND city = $city  ") 
                       or die( "An unknown error occurred with your request");          
} else {             
  $results3 = mysql_query("SELECT * FROM generalinfo");  
} /*if statement ends*/

Answer 1

在SQL中需要使用单引号括起字符串：

"SELECT * FROM generalinfo WHERE province='$province' AND city='$city'"

请注意，以这种方式构造查询可能会使您面临SQL注入漏洞的风险。请考虑使用mysql_real_escape_string代替。

"SELECT * FROM generalinfo WHERE province='" .
mysql_real_escape_string($province) . "' AND city='" .
mysql_real_escape_string($city) . "'"

mysql_query where语句

1 个答案: