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php - 使用包含表单数据的数组更新数据库

问题描述

我有一个表单可以动态加载要从我的数据库中更新的数据。第一个表单域包含表 1 中的一个问题，第二个表单域包含每个问题的可选答案，例如选项 a、b、c、d。表格如下所示：

问题 1

问题2

等等（动态）。提交表单时，应更新对问题和答案的所有更改。我的问题是我无法正确地将问题和选项以正确的格式保存在数组中，我如何使用他们的唯一 ID 更新我的数据库。

这是我到目前为止所拥有的......

我的数据库结构

问题表

选项表

我的表格.php

<?php

$cid = $_GET['course_id'];
$i = 0;
$z= 0;
$host   = 'localhost';
$dbname = 'einstower_elearn';
$username = "root";
$password = "";
$pdo = new PDO('mysql:dbname=einstower_elearn;host=localhost', $username, $password);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$question[] = 0;
$mysqli = new mysqli("localhost", "root", "", "einstower_elearn");

$getusr = $pdo->prepare("SELECT * FROM questions WHERE eid= '$cid'");


$getusr->execute();

$count_q = $getusr->rowCount();

$getusr->setFetchMode(PDO::FETCH_ASSOC);

  while($obj = $getusr->fetch())
        {
         //Create an array for question ID 
$question[] = $obj['qid'];
}


//for each question get its options from another table
foreach ($question as $key => $value) {
  # code...

$getopt = $pdo->prepare("SELECT * FROM questions WHERE qid= '$value' AND eid='$cid'");


$getopt->execute();

$count_questions = $getopt->rowCount();

if ($count_questions>=1){

$getopt->setFetchMode(PDO::FETCH_ASSOC);

     while($obj = $getopt->fetch())
        {
          $z++;
$qid2 = $obj['qid'];
$questionName = $obj['qns'];
//form starts here
echo '
            <form method="POST" action="edit_exam_course.php" enctype="multipart/form-data">
  <input type="hidden" class="form-control" name="qid" value="'.$qid2.'">
        <div class="row form-group" style="padding-top:40px !important;">
                    <div class="col-sm-2">
                        <label class="control-label modal-label">Question</label>
                    </div>
                    <div class="col-sm-10">
    //Create an array for updated questions in form
                        <input type="text" value="'.$questionName.'" class="form-control" name="l_title[]" required>
                    </div>
                </div>';
$getopt = $pdo->prepare("SELECT * FROM options WHERE qid= '$qid2'");


$getopt->execute();

$count_mat = $getopt->rowCount();

$getopt->setFetchMode(PDO::FETCH_ASSOC);

     while($obj = $getopt->fetch())
        {
          $i++;
$optionTitle = $obj['option'];
$optionID = $obj['optionid'];
               echo '<div class="rwo form-group">
  <label class="col-md-12 control-label" for="' . $i . '1"></label>  
  <div class="col-md-12">
//option ids (unique)
  <input type="hidden" class="form-control" name="questid" value="'.$optionID.'">
  <input id="' . $i . '1" name="optTitle" value="'.$optionTitle.'" class="form-control input-md" type="text">

  </div>
</div>'; 
}}

  }elseif ($count_questions<=0) {

                   unset($question);
                   $question[] = null;
}
}
?>

            <div class="modal-footer">
                <button type="button" class="btn btn-default" data-dismiss="modal"><span class="glyphicon glyphicon-remove"></span> Cancel</button>
                <button type="submit" name="update_exam_course" class="btn btn-primary"><span class="glyphicon glyphicon-check"></span>Update</button>
            </div>

?>

编辑考试课程.php

<?php
  session_start();
  include_once('connection.php');

  if(isset($_POST['update_exam_course'])){
  //for each question i want to update the question and its options
  foreach ($_POST['l_title'] as $p) {
//query would be here
var_dump($_POST);
      }

}
?>

目前数组的内容有所有问题和最后一个问题的最后一个选项。我想要的是为每个问题及其选项提供一个数组，以及如何使用这个数组来更新数据库。您的帮助将不胜感激

标签： phparraysfor-loop

解决方案

您没有将输入数组与问题 ID 相关联，并且在选项输入中您根本没有使用数组。

我在您的代码中添加了一些更改，包括优化 - 您每次都在循环内查询，而不是在循环外查询一次。查看我添加的评论以更好地理解。

<?php
$cid = $_GET['course_id'];
$i = 0;
$z = 0;
$host = 'localhost';
$dbname = 'einstower_elearn';
$username = "root";
$password = "";
$pdo = new PDO('mysql:dbname=einstower_elearn;host=localhost', $username, $password);
$pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
$mysqli = new mysqli("localhost", "root", "", "einstower_elearn");

$getusr = $pdo->prepare("SELECT * FROM questions WHERE eid= '$cid'");
$getusr->execute();

$count_q = $getusr->rowCount();

// Initialising questions array
$question = [];

while ($obj = $getusr->fetch(PDO::FETCH_ASSOC)) {
    // Adding question to array with 'qid' as a key.
    $question[$obj['qid']] = $obj;
}

// Initializing options array
$options = [];

// Selecting options
$getopt = $pdo->prepare("SELECT * FROM options WHERE qid IN ('" . implode("','", array_keys($question)) . "')");

while ($obj = $getopt->fetch(PDO::FETCH_ASSOC)) {
    // Adding option to array with 'qid' as a key.
    $options[$obj['qid']][] = $obj;
}

// Selecting questions
$getopt = $pdo->prepare("SELECT * FROM questions WHERE qid IN ('" . implode("','", array_keys($question)) . "') AND eid='$cid'");

// Looping through questions
while ($obj = $getopt->fetch(PDO::FETCH_ASSOC)) {
    $z++;
    $qid2 = $obj['qid'];
    $questionName = $obj['qns'];
//form starts here
    echo '
        <form method="POST" action="edit_exam_course.php" enctype="multipart/form-data">
            <input type="hidden" class="form-control" name="qid" value="' . $qid2 . '">
            <div class="row form-group" style="padding-top:40px !important;">
                <div class="col-sm-2">
                    <label class="control-label modal-label">Question</label>
                </div>
                <div class="col-sm-10">
                    //Create an array for updated questions in form
                    <input type="text" value="' . $questionName . '" class="form-control" name="question[' . $qid2 . ']" required>
                </div>
            </div>';

    foreach ($options[$obj['qid']] as $obj) {
        $i++;
        $optionTitle = $obj['option'];
        $optionID = $obj['optionid'];
        echo '
            <div class="rwo form-group">
                <label class="col-md-12 control-label" for="' . $i . '1"></label>  
                <div class="col-md-12">
                    //option ids (unique)
                    <input id="' . $i . '1" name="optTitle[' . $qid2 . '][' . $optionID . ']" value="' . $optionTitle . '" class="form-control input-md" type="text">
                </div>
            </div>';
    }
}
?>

<div class="modal-footer">
    <button type="button" class="btn btn-default" data-dismiss="modal"><span class="glyphicon glyphicon-remove"></span>
        Cancel
    </button>
    <button type="submit" name="update_exam_course" class="btn btn-primary"><span
                class="glyphicon glyphicon-check"></span>Update
    </button>
</div>

在 ajax 页面中执行：

<?php
var_dump($_POST);

或者

<?php
print_r($_POST);

了解结果并相应地编写代码。

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