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我正在创建一个登录页面,如果 SELECT 查询返回一个包含用户名和密码的匹配行,那么它将返回一个行数为 1 的登录页面。当我回显变量时,我现在对其进行编码的方式是存储行数,由于某种原因它会回显 26,我不确定为什么。

有人会解释我是否做错了什么,或者这是否是正常行为以及该值来自何处?

function checkLogin($conn,$myusername,$mypassword,$row,$row1){
   try {  
        $sql = "SELECT COUNT(*) FROM CLL_users WHERE user_name = 'user' AND password = 'XXXX'";
        if ($results = $conn->query($sql)) {

            if($results->fetchColumn() > 0) {

                $sql = "SELECT * FROM CLL_users WHERE user_name = 'user' AND password = 'XXXXX'";
                foreach ($conn->query($sql) as $row)
                {               
                   $rowCount = count($row);
                   echo $rowCount;
                    print ("Username: " . $row['user_name'] . "<br>");
                     print ("Username: " . $row['password'] . "<br>");

                    }

                    echo $count;
          }
        else {
            print "NO ROWS";
        }
        }
        } catch (PDOException $e){
    echo 'Connection failed: ' . $e->getMessage();
}

}
4

2 回答 2

2

您的代码$rowCount = count($row);正在计算当前行中的列数,而不是查询返回的行数。

同样,您正在回显第二个与计数相关的变量$count,但您既没有声明它也没有在代码中增加它。看起来这个是应该计算你循环通过的行数的那个。如果这是真的,您应该将其设置为$count = 0;循环之前并$count++;在其中使用:

$count = 0;
foreach ($conn->query($sql) as $row) {
    print ("Username: " . $row['user_name'] . "<br>");
    print ("Username: " . $row['password'] . "<br>");
    $count++;
}
echo $count;

此外,您目前rowCount在选择用户之前正在使用 PDO,并且您正在正确使用它。您可以将该结果存储到一个变量中并使用它来判断您收到了多少行:

$sql = "SELECT COUNT(*) FROM CLL_users WHERE user_name = 'user' AND password = 'XXXX'";
if ($results = $conn->query($sql)) {
    $numRows = $results->fetchColumn();
    if($numRows > 0) {
        ... rest of your code ....
于 2012-11-04T04:19:44.943 回答
1
function checkLogin($conn,$myusername,$mypassword,$row,$row1)
{
   try
   {  
       $sql = "SELECT COUNT(*) FROM CLL_users WHERE user_name = 'user' AND password = 'XXXX'";
       if ($results = $conn->query($sql))
       {

           $count = $results->fetchColumn();
           echo "$count\n";

           if($count > 0)
           {
               $sql = "SELECT * FROM CLL_users WHERE user_name = 'user' AND password = 'XXXXX'";
               foreach ($conn->query($sql) as $row)
               {               
                   print ("Username: " . $row['user_name'] . "<br>");
                   print ("Username: " . $row['password'] . "<br>");     
               }
           }
           else
           {
               print "NO ROWS";
           }
       }
   }
   catch (PDOException $e)
   {
       echo 'Connection failed: ' . $e->getMessage();
   }

}
于 2012-11-04T04:24:36.860 回答