PHP/MySQL-停止运行相同查询的Foreach
我一直在尝试创建一个投票系统，该系统对数据库运行查询，如果找到匹配项，则不包含该答案 这是一个投票系统，当用户在投票中投票时，它将pollid和userid存储在一个数据库表中，当用户再次访问页面时，会在该数据库表中检索到它们，因此不会显示他们以前投票的投票 我会尽力解释，我发现很难理解自己 在my Pollsdone中，轮询和完成轮询的用户ID表包含2行2列 这两行是： 波利德 用户ID pollsdone的两列是Userid，这无关紧要： 26，用户ID 76，用户ID SQL: 当我使用：PHP/MySQL-停止运行相同查询的Foreach,php,mysql,if-statement,foreach,Php,Mysql,If Statement,Foreach,我一直在尝试创建一个投票系统，该系统对数据库运行查询，如果找到匹配项，则不包含该答案 这是一个投票系统，当用户在投票中投票时，它将pollid和userid存储在一个数据库表中，当用户再次访问页面时，会在该数据库表中检索到它们，因此不会显示他们以前投票的投票 我会尽力解释，我发现很难理解自己 在my Pollsdone中，轮询和完成轮询的用户ID表包含2行2列 这两行是： 波利德 用户ID pollsdone的两列是Userid，这无关紧要： 26，用户ID 76，用户ID SQL: 当我使用：
foreach ($db->query($sql) as $row) {
foreach ($db->query($completedVoteSearch) as $done) {
if ($done['pollid'] != $row['pollid']) {
// CREATE POLL CODE
try {
$db = new PDO("mysql:host=$mysql_host;dbname=$mysql_db", $mysql_user, $mysql_pass);
$sql = "SELECT * FROM Polls";
$completedVoteSearch = "SELECT * FROM Pollsdone WHERE userid='10'";
foreach ($db->query($sql) as $row) {
foreach ($db->query($completedVoteSearch) as $done) {
if ($done['pollid'] == $row['pollid']) {
echo "We have a match!";
}
if ($done['pollid'] != $row['pollid']) {
echo "<br/>";
echo $done['pollid'] . ", ";
echo $row['pollid'] . ", ";
echo "<br/>";
$pollid = $row['pollid'];
$title = $row['title'];
$type = $row['type'];
if ($type == "s") {
$type = "radio";
} else {
$type = "checkbox";
}
$option1 = $row['option1'];
$option2 = $row['option2'];
$option3 = $row['option3'];
$option4 = $row['option4'];
$option5 = $row['option5'];
$option6 = $row['option6'];
$option1vote = $row['option1vote'];
$option2vote = $row['option2vote'];
$option3vote = $row['option3vote'];
$option4vote = $row['option4vote'];
$option5vote = $row['option5vote'];
$option6vote = $row['option6vote'];
$option1voteColumn = "option1vote";
$option2voteColumn = "option2vote";
$option3voteColumn = "option3vote";
$option4voteColumn = "option4vote";
$option5voteColumn = "option5vote";
$option6voteColumn = "option6vote";
}
}
// $isCompleteSQL = "SELECT * FROM Pollsdone WHERE userid='10' ";
// if ()
if (strlen($option3) < 1 && strlen($option2) > 0) {
echo '<div class="userPoll">
<div class="pollTitle">
<h3 class="pollHeader">' . $title . ' (ID = ' . $pollid . ')</h3>
</div>
<div class="pollContent">
<p class="pollSubTitle">Created By <a href="profile.php">Username</a></p>
<form class="poll" method="POST" action="mypolls.php">
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'" value="option1vote"><p class="pollAnswerText">' . $option1 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'" value="option2vote"><p class="pollAnswerText">' . $option2 . '</p></label><br/>
<input type="submit" class="pollSubmit btn btn-default"/>
</form>
</div>
</div>';
if ($_POST[$pollid] . $pollid == $option1voteColumn . $pollid) {
$option1vote = ($option1vote + 1);
$voteSQL = "UPDATE Polls SET ".$option1voteColumn."='".$option1vote."' WHERE pollid='".$pollid."'";
$db->exec($voteSQL);
}
}
if (strlen($option4) < 1 && strlen($option3) > 0) {
echo '<div class="userPoll">
<div class="pollTitle">
<h3 class="pollHeader">' . $title . ' (ID = ' . $pollid . ')</h3>
</div>
<div class="pollContent">
<p class="pollSubTitle">Created By <a href="profile.php">Username</a></p>
<form class="poll" method="POST" action="mypolls.php">
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option1 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option2 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option3 . '</p></label><br/>
<input type="submit" class="pollSubmit btn btn-default"/>
</form>
</div>
</div>';
}
if (strlen($option5) < 1 && strlen($option4) > 0) {
echo '<div class="userPoll">
<div class="pollTitle">
<h3 class="pollHeader">' . $title . ' (ID = ' . $pollid . ')</h3>
</div>
<div class="pollContent">
<p class="pollSubTitle">Created By <a href="profile.php">Username</a></p>
<form class="poll" method="POST" action="mypolls.php">
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option1 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option2 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option3 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option4 . '</p></label><br/>
<input type="submit" class="pollSubmit btn btn-default"/>
</form>
</div>
</div>';
}
if (strlen($option6) < 1 && strlen($option5) > 0) {
echo '<div class="userPoll">
<div class="pollTitle">
<h3 class="pollHeader">' . $title . ' (ID = ' . $pollid . ')</h3>
</div>
<div class="pollContent">
<p class="pollSubTitle">Created By <a href="profile.php">Username</a></p>
<form class="poll" method="POST" action="mypolls.php">
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option1 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option2 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option3 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option4 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option5 . '</p></label><br/>
<input type="submit" class="pollSubmit btn btn-default"/>
</form>
</div>
</div>';
}
if (strlen($option6) > 0) {
echo '<div class="userPoll">
<div class="pollTitle">
<h3 class="pollHeader">' . $title . ' (ID = ' . $pollid . ')</h3>
</div>
<div class="pollContent">
<p class="pollSubTitle">Created By <a href="profile.php">Username</a></p>
<form class="poll" method="POST" action="mypolls.php">
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option1 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option2 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option3 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option4 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option5 . '</p></label><br/>
<label><input type="' . $type . '" class="pollAnswer" name="'. $pollid .'"><p class="pollAnswerText">' . $option6 . '</p></label><br/>
<input type="submit" class="pollSubmit btn btn-default"/>
</form>
</div>
</div>';
}
}$db = null;
} catch(PDOException $e) {
$e->getMessage();
}
所以，如果我没弄错的话，您正在尝试选择用户尚未参与的投票。 您可以使用以下查询：
select * from `polls_table`
where `pollid` NOT IN
(select `pollid` from `pollsdone`
where `user_id` = 10)
什么是44,76，什么是76,76？你想要达到的主要目标是什么？不显示用户已参与的投票？从pollid不在的轮询中选择*从polldone中选择pollid，其中user_id=10可能有效。我会试试看，然后在@U_mulder之前给你！然后我得到了错误警告：在第70行的[..loc..]中为foreach提供的参数无效。foreach是：foreach$db->query$sql as$行，sql是：$sql=SELECT*FROM Polls，其中pollid不在，SELECT pollid FROM Pollsdone，其中userid=10；不，对不起。我只是把你的SQL复制错了，它工作得很好，使用的代码也少很多。创建一个答案，你将是1！：非常感谢！
select * from `polls_table`
where `pollid` NOT IN
(select `pollid` from `pollsdone`
where `user_id` = 10)