Question

我有一个非常有用的系统。单击unfriend按钮后，表格将更新以删除您已更新的朋友。唯一的问题是它删除了你的所有朋友而不是数组中的1。

该数组类似于这个friend1，friend2，friend3，如果你想删除friend2，friend1和3也将无缘无故删除。

帮助:(

    if (@$_POST['removefriend']) {
    //Friend array for logged in user
     $add_friend_check = mysql_query("SELECT friend_array FROM users WHERE username='{$_SESSION['user_login']}'");
     $get_friend_row = mysql_fetch_assoc($add_friend_check);
      $friend_array = $get_friend_row['friend_array'];
      $friend_array_explode = explode(",",$friend_array);
      $friend_array_count = count($friend_array_explode);

      //Friend array for user who owns profile
      $add_friend_check_username = mysql_query("SELECT friend_array FROM users WHERE username='{$_SESSION['user_login']}'");
      $get_friend_row_username = mysql_fetch_assoc($add_friend_check_username);
        $friend_array_username = $get_friend_row_username['friend_array'];
        $friend_array_explode_username = explode(",",$friend_array_username);
        $friend_array_count_username = count($friend_array_explode_username);

        $usernameComma = ",".$username;
        $usernameComma2 = $username.",";

        $userComma = ",".$user;
        $userComma2 = $user.",";

        if (strstr($friend_array,$usernameComma)) {
        $friend1 = str_replace("$usernameComma","",$friend_array);
        }
        else
        if (strstr($friend_array,$usernameComma2)) {
        $friend1 = str_replace("$usernameComma2","",$friend_array);
         }
         else
         if (strstr($friend_array,$username)) {
          $friend1 = str_replace("$username","",$friend_array);
          }
         //Remove logged in user from other persons array
         if (strstr($friend_array,$userComma)) {
         $friend2 = str_replace("$userComma","",$friend_array);
           }
         else
         if (strstr($friend_array,$userComma2)) {
         $friend2 = str_replace("$userComma2","",$friend_array);
         }
         else
         if (strstr($friend_array,$user)) {
         $friend2 = str_replace("$user","",$friend_array);
         }

         $friend2 = "";

        $removeFriendQuery = mysql_query("UPDATE users SET friend_array='$friend1' WHERE username='{$_SESSION['user_login']}'");
        $removeFriendQuery_username = mysql_query("UPDATE users SET friend_array='$friend2' WHERE username='{$_SESSION['user_login']}'");
        echo "Friend Removed ...";
        }

Answer 1

首先，我建议您遵循@MarkBaker和@nichar建议并规范化您的数据库结构。您可以查看stackoverflow.com/questions/5135889/how-to-normalize-a-sql-database以及仅搜索stackoverflow - stackoverflow.com/search?q=How+to+normalize+a+SQL+Database。

考虑到这一点，以下是您的代码的一些问题 -

（1）您在两个查询中都获得了相同的好友数组。

//Friend array for logged in user
$add_friend_check = mysql_query("SELECT friend_array FROM users WHERE username='{$_SESSION['user_login']}'");
//Friend array for user who owns profile
$add_friend_check_username = mysql_query("SELECT friend_array FROM users WHERE username='{$_SESSION['user_login']}'");

您的第二个查询应该是从他们正在删除的朋友那里获取朋友数组。

$add_friend_check_username = mysql_query("SELECT friend_array FROM users WHERE username='$username'");

（2）从朋友阵列中删除用户时，使用他们自己的朋友阵列

//Remove logged in user from other persons array
if (strstr($friend_array,$userComma)) {
$friend2 = str_replace("$userComma","",$friend_array);
}
else
if (strstr($friend_array,$userComma2)) {
$friend2 = str_replace("$userComma2","",$friend_array);
}
else
if (strstr($friend_array,$user)) {
$friend2 = str_replace("$user","",$friend_array);
}

你应该从好友数组中删除它们

//Remove logged in user from other persons array
if (strstr($friend_array_username,$userComma)) {
$friend2 = str_replace("$userComma","",$friend_array_username);
}
else
if (strstr($friend_array_username,$userComma2)) {
$friend2 = str_replace("$userComma2","",$friend_array_username);
}
else
if (strstr($friend_array_username,$user)) {
$friend2 = str_replace("$user","",$friend_array_username);
}

（3）完成从他们的朋友数组中删除它们的所有工作之后，你现在正在使朋友数组为空

$friend2 = "";

这应该删除。

（4）最后，您要更新用户朋友阵列两次，而不是朋友阵列，当您进行第二次更新时，您将根据问题＃4将其更新为空白

$removeFriendQuery = mysql_query("UPDATE users SET friend_array='$friend1' WHERE username='{$_SESSION['user_login']}'");
$removeFriendQuery_username = mysql_query("UPDATE users SET friend_array='$friend2' WHERE username='{$_SESSION['user_login']}'");

将您的第二个查询更改为 -

$removeFriendQuery_username = mysql_query("UPDATE users SET friend_array='$friend2' WHERE username='$username'");

现在，我假设

$username == the friend that you are deleting 
$user == logged-in user || $_SESSION['user_login']

因为这些已被使用，但未在您的代码中定义。

另外，请注意，您不应该使用mysql_*函数编写新代码。不鼓励使用此扩展名。相反，应使用MySQLi或PDO_MySQL扩展名。有关详细信息，另请参阅MySQL: choosing an API指南和相关FAQ。

更新语句不会工作mysql

1 个答案: