6

我现在只是为了好玩而制作一些网站，但我被困在了一个点上。

我想执行一个小组任务，小组的任何成员都可以开始它。该组的所有人将获得相同数量的金币，经验并共享相同的冷却时间。我的数据库中有 3 个表（我只会显示重要信息）

Members:
username, level, experience, playergold

Levels:
level, required_experience

Groups:
leader, member_1, member_2, member_3, last_quest_started, quest_cooldown

Quests:
success_message, failed_message, chance, minimum_experience, maximum_experience, minimum_gold, maximum_gold, cooldown

我想分组更新last_quest_started和quest_cooldown，我想更新每个成员他/她的等级、经验、playergold

所以在得到组员的每个用户名，任务数据后，计算经验和金币。我用它来更新：

if($select_members_info_stmt = $mysqli->prepare("SELECT members.username, members.level, members.experience, members.playergold, levels.required_experience FROM members INNER JOIN levels ON members.level = levels.level WHERE ((members.username = ?) OR (members.username = ?) OR (members.username = ?) OR(members.username = ?))"))
{
    $select_members_info_stmt->bind_param('ssss', $leader, $member_1, $member_2, $member_3);
    $select_members_info_stmt->execute();
    $select_members_info_stmt->bind_result($selected_username, $level, $experience, $playergold, $required_experience);
    while($select_members_info_stmt->fetch())
    {
        $now = time();

        if($update_user_stats_stmt = $mysqli->prepare("UPDATE members SET level = ?, experience = ?, playergold = ? WHERE username = ?"))
        {
            $update_user_stats_stmt->bind_param('iiiiis', $new_level, $new_experience, $new_gold, $now, $cooldown, $selected_username);
            $update_user_stats_stmt->execute();
            if($update_user_stats_stmt->affected_rows == 0)
            {
                    echo '<div>Because of a system error it is impossible to perform a task, we apologize for this inconvience. Try again later.</div>';
            }
            $update_user_stats_stmt->close();
        }
        else                                
        {
            printf("Update user stats error: %s<br />", $mysqli->error);
        }
    }
    $select_members_info_stmt->close();
    echo '<div>'.$success_message.'</div><br />';
}
else
{
    printf("Select members info error: %s<br />", $mysqli_error);
}

但我不断得到：

更新用户统计错误：命令不同步；您现在无法运行此命令（4 次，这是我的组已满时的大小。）

我只是找不到解决不同步错误的解决方案，因为我无法关闭 $select_members_info_stmt 因为它会停止获取。

请帮帮我，因为我真的不知道该怎么做。

4

2 回答 2

6

你不能这样嵌套execute()。

最好的解决方案是将成员列表array()一次性扔掉，关闭连接，然后迭代该数组并更新每条记录。

它应该如下所示：

$select_members_info_stmt->bind_param('ssss', $leader, $member_1, $member_2, $member_3);
$select_members_info_stmt->execute();
$select_members_info_stmt->bind_result($selected_username, $level, $experience, $playergold, $required_experience);

$members = array();
while($select_members_info_stmt->fetch())
{
    // tossing into the array
    $members[] = array(
        'selected_username' =>$selected_username, 
        'level' => $level, 
        'experience' => $experience, 
        'playergold' => $playergold, 
        'required_experience' => $required_experience
    );
}
$select_members_info_stmt->close();

// Now iterate through the array and update the user stats
foreach ($members as $m) {
    if($update_user_stats_stmt = $mysqli->prepare("UPDATE members SET level = ?, experience = ?, playergold = ? WHERE username = ?"))
    {
        // Note that you need to use $m['selected_username'] here. 
        $update_user_stats_stmt->bind_param('iiiiis', $new_level, $new_experience, $new_gold, $now, $cooldown, $m['selected_username']);
        $update_user_stats_stmt->execute();
        if($update_user_stats_stmt->affected_rows == 0)
        {
                echo '<div>Because of a system error it is impossible to perform a task, we apologize for this inconvience. Try again later.</div>';
        }
        $update_user_stats_stmt->close();
    }
    else                                
    {
        printf("Update user stats error: %s<br />", $mysqli->error);
    }

}
于 2013-01-23T00:14:39.020 回答
3

您不能在与 mysql 的同一连接上嵌套主动运行的准备好的语句。一旦你调用execute()了任何语句，你就不能在同一个连接上运行另一个语句，直到该准备好的语句关闭。一旦开始执行第二个准备好的语句，第一个准备好的语句上的任何提取都将失败。

每个连接只能在 mysql 服务器上准备和运行一个“实时”语句

如果你真的需要嵌套你准备好的语句，你可以建立 2 个单独的 mysqli 连接。

于 2013-01-22T23:52:50.497 回答