我试图将多行更新到数据库中，但每次只能更新第四行，即$ anstext4。可能是什么错误？
PHP代码：
<?php
$_POST = array(); //workaround for broken PHPstorm
parse_str(file_get_contents('php://input'), $_POST);
session_start();
if(isset($_SESSION['doctor'])) {
require 'dbConn.php';
$id = null;
if(!empty($_GET['id'])) {
$questionid = $_REQUEST['id'];
}
if(null==$questionid) {
header("location: admin_home.php");
}
if(!empty($_POST)) {
$questiontextError = null;
$anstext1Error = null;
$anstext2Error = null;
$anstext3Error = null;
$anstext4Error = null;
$questiontext = $_POST['questiontext'];
$anstext1 = $_POST['ans1'];
$anstext2 = $_POST['ans2'];
$anstext3 = $_POST['ans3'];
$anstext4 = $_POST['ans4'];
//$answers = $_POST['ans'];
//$answers = array($_POST['ans1'], $_POST['ans2'], $_POST['ans3'], $_POST['ans4']);
//$answers = array($_POST['ans']);
/*$answers[] = $_POST['ans1'];
$answers[] = $_POST['ans2'];
$answers[] = $_POST['ans3'];
$answers[] = $_POST['ans4'];*/
$radiobtn = $_POST['radioans'];
$valid = true;
if(empty($questiontext)) {
$questiontextError = 'Please enter valid data';
$valid = false;
}
/* if(empty($anstext1)) {
$anstext1Error = 'Enter the first data';
$valid = false;
}
if(empty($anstext2)) {
$anstext2Error = 'Enter the second data';
$valid = false;
}
if(empty($anstext3)) {
$anstext3Error = 'Enter the third data';
$valid = false;
}
if(empty($anstext4)) {
$anstext4Error = 'Enter the fourth data';
$valid = false;
}*/
//Update the data
if($valid) {
$sql = "UPDATE `question`
SET `question_text` = :questiontext,
`question_type` = 'mcq',
`correct_answer` = :radioans
WHERE question.id = ".$questionid;
//$result = $conn->query($sql);
$result = $conn->prepare($sql);
$result->bindParam(":questiontext", $questiontext);
$result->bindParam(":radioans", $radiobtn);
//$result->execute(array($questiontext,$radiobtn));
$result->execute();
// $count= null;
/*for($i=0; $i<$count; $i++) {
$sql2 = "UPDATE `option_tbl` SET option_answer=':ans[$i]' WHERE question_id = ".$questionid;
$result2 = $conn->prepare($sql2);
$result2->execute();
}*/
/*$sql2 = "UPDATE `option_tbl`
SET `option_answer` = :ans
WHERE question_id = ".$questionid;
$result2 = $conn->prepare($sql2);*/
$sql2 = "UPDATE `option_tbl`
SET `option_answer` = :ans
WHERE question_id = '$questionid'";
$result2 = $conn->prepare($sql2);
$result2->bindParam(":ans",$anstext1);
$result2->execute();
$result2->bindParam(":ans",$anstext2);
$result2->execute();
$result2->bindParam(":ans",$anstext3);
$result2->execute();
$result2->bindParam(":ans",$anstext4);
$result2->execute();
//$result2->bindParam(":ans", $answers);
$result2->execute();
/*$result2->execute(array(":ans" => $_POST['ans1'],
":ans" => $_POST['ans2'],
":ans" => $_POST['ans3'],
":ans" => $_POST['ans4']));*/
/*for($i=0; $i < count($questionid); $i++) {
$result2->execute([
':ans' => $_POST['ans1'][$i],
':ans' => $_POST['ans2'][$i],
':ans' => $_POST['ans3'][$i],
':ans' => $_POST['ans4'][$i]]);
print_r($result2);
}*/
/*foreach ($answers as $answer) {
$result2 = $conn->prepare("UPDATE `option_tbl` SET `option_answer` =? WHERE question_id =?");
$result2->bindParam("ss", $answer, $questionid);
$result2->execute();
}*/
/*$sql2 = "UPDATE `option_tbl` SET `option_answer` = :ans WHERE '$questionid' = :id";
foreach ($answers as $key => $answer) {
$result2 = $conn->prepare($sql2);
$result2->bindParam(':ans', $answer);
//$result2->bindParam(':id', $questionid);
$result2->execute();
}*/
$conn = null;
//header('Location: '.$_SERVER['PHP_SELF']);
echo "Successful";
}
}
?>
这两个答案都会影响整个列结果，使其成为最后一个值。
HTML code：
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" type="text/css" href="Assets/index_style.css"/>
<link rel="stylesheet" href="bootstrap/css/bootstrap.css"/>
<link href="https://fonts.googleapis.com/css?family=Comfortaa" rel="stylesheet">
<script src="Assets/jquery-1.11.3-jquery.min.js"></script>
<script type="text/javascript" src="//code.jquery.com/jquery-latest.js"></script>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<script>
//back button function
function goBack() {
window.history.back();
}
</script>
</head>
<body>
<div class="container">
<div class="header clearfix">
<nav>
<ul class="nav nav-pills pull-right">
<li role="presentation" class="active"><a href="settings.php">Settings</a></li>
<li role="presentation"><a href="logout.php">Logout</a></li>
</ul>
</nav>
</div> <!-- /container -->
<div class="container">
<button type="button" class="btn btn-success" onclick="goBack()">back</button>
<br>
<h3 class="text-muted">Update the data</h3>
<div class="span10 offset1">
<form class="form-horizontal" action="admin_update.php?id=<?php echo $questionid?>" method="POST">
<div class="control-group <?php echo !empty($questiontextError)?'error':'';?>">
<label class="control-label">Question: </label>
<div class="controls">
<input name="questiontext" type="text" size="60" placeholder="Question" value="<?php echo !empty($questiontext)?$questiontext:'';?>">
<?php if (!empty($questiontextError)): ?>
<span class="help-inline"><?php echo $questiontextError;?></span>
<?php endif; ?>
</div>
</div>
<div class="control-group <?php echo !empty($anstext1Error)?'error':'';?>">
<label class="control-label">1.</label>
<!--<div class="controls">-->
<input name="ans1" type="text" size="40" value="<?php echo !empty($anstext1)?$anstext1:'';?>">
<input type="radio" name="radioans" value="1">
<?php if (!empty($anstext1Error)): ?>
<span class="help-inline"><?php echo $anstext1Error;?></span>
<?php endif;?>
<!--</div>-->
</div>
<div class="control-group <?php echo !empty($anstext2Error)?'error':'';?>">
<label class="control-label">2.</label>
<!--<div class="controls">-->
<input name="ans2" type="text" size="40" value="<?php echo !empty($anstext2)?$anstext2:'';?>">
<input type="radio" name="radioans" value="2">
<?php if (!empty($anstext2Error)): ?>
<span class="help-inline"><?php echo $anstext2Error;?></span>
<?php endif;?>
<!--</div>-->
</div>
<div class="control-group <?php echo !empty($anstext3Error)?'error':'';?>">
<label class="control-label">3.</label>
<!--<div class="controls">-->
<input name="ans3" type="text" size="40" value="<?php echo !empty($anstext3)?$anstext3:'';?>">
<input type="radio" name="radioans" value="3">
<?php if (!empty($anstext3Error)): ?>
<span class="help-inline"><?php echo $anstext3Error;?></span>
<?php endif;?>
<!--</div>-->
</div>
<div class="control-group <?php echo !empty($anstext4Error)?'error':'';?>">
<label class="control-label">4.</label>
<!--<div class="controls">-->
<input name="ans4" type="text" size="40" value="<?php echo !empty($anstext4)?$anstext4:'';?>">
<input type="radio" name="radioans" value="4">
<?php if (!empty($anstext4Error)): ?>
<span class="help-inline"><?php echo $anstext4Error;?></span>
<?php endif;?>
<!--</div>-->
</div>
<div class="form-actions">
<button type="submit" class="btn btn-success">Update</button>
<a class="btn" href="crud.php">Back</a>
</div>
</form>
</div>
</div>
<footer class="footer">
<p>© 2016, Inc.</p>
</footer>
</body>
</html>
<?php
}
?>
我尝试过使用foreach但它不会工作
foreach ($answers as $answer) {
$stmt = $conn->prepare("UPDATE option_tbl SET option_answer = :ans
WHERE question_id = '$questionid'");
$stmt->execute();
}
答案 0 :(得分：0)
使用每个绑定参数进行foreach循环更新。您要为一个参数设置4个值，这就是为什么它取最后一个参数的原因。你需要一个循环
试试这个：
if (!empty($_POST)) {
$answers = array($_POST['ans1'], $_POST['ans2'], $_POST['ans3'], $_POST['ans4']);
foreach ($answers as $answer) {
$result = $conn->prepare("UPDATE option_tbl SET option_answer =? WHERE question_id =?");
$result->bindParam("ss", $answer, $questionid);
$result->execute();
}
}
答案 1 :(得分：0)
首先，您需要知道要为每个查询进行seprade调用，因此您需要进行“准备”。呼唤evry电话 （有一种方法可以在一次通话中完成，但我们现在就把它留下来） 所以
if(!empty($_POST)){
$answers = $_POST // duplicate _POST array into answers
// Declering the sql template, pay attenion that I make another param to bind in, :id
$sql = "UPDATE `option_tbl` SET `option_answer` = :ans WHERE question_id = :id";
// Then for each on answers array
foreach ($answers as $key => $answer) {
// prepare
$result = $conn->prepare($sql);
// bind the params
$result->bindParam(':ans', $answer);
$result->bindParam(':id', $YourId); // Best want is to do array of ids and bind the $key of the foreach in it
// Execute the query
$result->execute();
}
}