如何更新表行并在行字段中添加+ 1?

时间:2014-02-01 15:19:04

标签: php mysql count row

这几天我遇到了麻烦。还在学习..无论如何 - 通过这个输入

form action='votes.php' method='post'>
<input type='hidden' name='WHATNAME' value='WHAT?'/>
<input class='voteUp' type='submit' name='submitUp' value='+'/>
</form>

我想更新表格!我想更新用+ 1提交的'voteup',只有那个。 HEre是表Answers

CREATE TABLE IF NOT EXISTS `answers` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `answer` text,
  `questionId` int(11) NOT NULL,
  `user` varchar(255),
  `date` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `ip` varchar(50) COLLATE utf8_unicode_ci NOT NULL,
  `voteup` int(11) NOT NULL,
  PRIMARY KEY (`id`)
  );

这是第二个表格问题

CREATE TABLE IF NOT EXISTS `questions` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `question` text NOT NULL,
  `user` varchar(255) NOT NULL,
  `datum` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
)

所以,有了这个,我有一个表格问题,每个问题都有很多答案。所以我想,我需要让有人可以为他认为正确的每个答案投票(投票)。到目前为止,我只投了一个答案才能获得成功,如果我给出第二个答案,它会给我一些奇怪的多次和双次计数。这是来自文件Votes.php的mysql查询更新我的投票,但只有当我有一个问题!

if (isset($_POST['submitUp'])) {  

$ip = $_SERVER['REMOTE_ADDR'];
$sql="INSERT INTO answers
SET voteup = voteup + 1,
ip = '$ip'  
";

这里是选择计数脚本,显示我有多少票

$ip = $_SERVER['REMOTE_ADDR'];
$results = mysqli_query($con,"SELECT SUM(voteup) as voteup FROM answers ");

while($row = mysqli_fetch_array($results))
  {

  echo $row['voteup'];

  }

如何针对具有不同问题ID的每个答案更新voteup字段。我尝试了几个组合,但没有!我希望我很清楚。谢谢!!!

1 个答案:

答案 0 :(得分:0)

您还需要将问题ID发布到脚本中:

<form action='votes.php' method='post'>
<input type='hidden' name='question_id' value='<?php echo $question_id; ?>'/>
<input type='hidden' name='answer_id' value='<?php echo $answer_id; ?>'/>
<input class='voteUp' type='submit' name='submitUp' value='+'/>
</form>

Votes.php应根据这些值进行更新(同时查找保护您的查询:http://www.php.net/manual/en/mysqli.real-escape-string.php):

if (isset($_POST['submitUp'])) {  
  $ip = $_SERVER['REMOTE_ADDR'];
  $question_id = mysqli_real_escape_string($connection, $_POST['question_id']);
  $anwer_id = mysqli_real_escape_string($connection, $_POST['answer_id']);
  $sql="UPDATE answers
        SET voteup = voteup + 1,
        ip = '$ip'
        WHERE id = $answer_id
        AND questionId = $question_id
        ";
}

请注意,在这种情况下,IP仅反映最后一个upvote的IP。要记录每个upvote的IP,您需要一个单独的表来存储upvote IP。