使用多个 PHP 下拉菜单过滤 MySQL 表

【问题标题】：Using Multiple PHP Drop Downs To Filter MySQL Table使用多个 PHP 下拉菜单过滤 MySQL 表
【发布时间】：2019-11-16 08:40:51
【问题描述】：

这是我的数据库表的图片 -> MySQL-Table

我正在尝试创建一个带有下拉选择器的搜索页面，以过滤最后 8 列中的每一列。 我希望下拉选择器能够选择多个条目（我已经有这个工作了） 我还希望他们从已经输入到我的表列中的数据中预加载值。 （我也在教程的帮助下完成了这个工作......虽然我承认我不完全理解这部分是如何工作的）

使用这些教程，我创建了一个 php 页面，其中包含 8 个下拉选择器，它们会自动从各自的列中提取值。我希望能够使用所有（或部分）这些列过滤器从我的表中过滤结果。 例如...假设我想显示属于 Genre=Metal、AND KeySig=E minor、AND Tempo=Fast 的所有条目... 我可能会使用 mysql 命令，例如 mysql> SELECT id, NameUrl, Genre, KeySig, TimeSig, Tempo, Tuning, EntType, Recording, RecYear FROM test_table WHERE Genre = 'Metal' AND KeySig = 'E minor' AND Tempo = 'Fast';

基本上我正在尝试通过 php 网页做同样的事情。 使用我现在拥有的代码，只有我的第一个下拉选择器“流派”实际上可以过滤任何内容。其余的过滤器就在那里.. 他们还没有设置做任何事情。我需要帮助从剩余的下拉菜单中提取 $_POST 请求，并提出代码，该代码将通过 AND 运算符使用多个变量过滤我的列。

我希望这是有道理的...我不太喜欢电脑...更多的是音乐家。将此构建为帮助我完成写作工作流程的工具。 希望有人可以提供帮助 - 谢谢

DBController.php

     <?php
 class DBController {
     private $host = "localhost";
     private $user = "root";
     private $password = "password";
     private $database = "test";
     private $conn;

         function __construct() {
         $this->conn = $this->connectDB();
          } 
     function connectDB() {
         $conn = mysqli_connect($this->host,$this->user,$this->password,$this->database);
         return $conn;
     }
         function runQuery($query) {
                 $result = mysqli_query($this->conn,$query);
                 while($row=mysqli_fetch_assoc($result)) {
                 $resultset[] = $row;
                 }      
                 if(!empty($resultset))
                 return $resultset;
     }
 }
 ?>

testsearch.php

        <?php
 include 'DBController.php';
 $db_handle = new DBController();
 $GenreResult = $db_handle->runQuery("SELECT DISTINCT Genre FROM test_table ORDER BY Genre ASC");
 $TempoResult = $db_handle->runQuery("SELECT DISTINCT Tempo FROM test_table ORDER BY Tempo ASC");
 $KeySigResult = $db_handle->runQuery("SELECT DISTINCT KeySig FROM test_table ORDER BY KeySig ASC");
 $TimeSigResult = $db_handle->runQuery("SELECT DISTINCT TimeSig FROM test_table ORDER BY TimeSig ASC");
 $TuningResult = $db_handle->runQuery("SELECT DISTINCT Tuning FROM test_table ORDER BY Tuning ASC");
 $EntTypeResult = $db_handle->runQuery("SELECT DISTINCT EntType FROM test_table ORDER BY EntType ASC");
 $RecordingResult = $db_handle->runQuery("SELECT DISTINCT Recording FROM test_table ORDER BY Recording ASC");
 $RecYearResult = $db_handle->runQuery("SELECT DISTINCT RecYear FROM test_table ORDER BY RecYear ASC");
 ?>
 <html>
 <head>
 <link href="style.css" type="text/css" rel="stylesheet" />
 <title>Riff Bank - Search & Upload</title>
 </head>
 <body>
     <h2>Riff Bank - Search & Upload</h2>
     <form method="POST" name="Genre" action="testsearch.php">
         <div id="demo-grid">
             <div class="search-box">
                 <select id="Place" name="Genre[]" multiple="multiple">
                     <option value="0" selected="selected">Select Genre</option>
                     <form method="POST" name="search" action="testsearch.php">
                         <?php
                         if (! empty($GenreResult)) {
                             foreach ($GenreResult as $key => $value) {
                                 echo '<option value="' . $GenreResult[$key]['Genre'] . '">' . $GenreResult[$key]['Genre'] . '</option>';
                             }
                         }
                         ?>
                 </select><br> <br>
                 <form method="POST" name="search" action="testsearch.php">
         <div id="demo-grid">
             <div class="search-box">
                 <select id="Place" name="KeySig[]" multiple="multiple">
                     <option value="0" selected="selected">Select Key</option>
                     <form method="POST" name="search" action="testsearch.php">
                         <?php
                         if (! empty($KeySigResult)) {
                             foreach ($KeySigResult as $key => $value) {
                                 echo '<option value="' . $KeySigResult[$key]['Tempo'] . '">' . $KeySigResult[$key]['KeySig'] . '</option>';
                             }
                         }
                         ?>
                 </select><br> <br>
                 <form method="POST" name="search" action="testsearch.php">
         <div id="demo-grid">
             <div class="search-box">
                 <select id="Place" name="TimeSig[]" multiple="multiple">
                     <option value="0" selected="selected">Select TIme Signature</option>
                     <form method="POST" name="search" action="testsearch.php">
                         <?php
                         if (! empty($TimeSigResult)) {
                             foreach ($TimeSigResult as $key => $value) {
                                 echo '<option value="' . $TimeSigResult[$key]['TimeSig'] . '">' . $TimeSigResult[$key]['TimeSig'] . '</option>';
                             }
                         }
                         ?>
                 </select><br> <br>
                 <form method="POST" name="search" action="index.php">
         <div id="demo-grid">
             <div class="search-box">
                 <select id="Place" name="Tempo[]" multiple="multiple">
                     <option value="0" selected="selected">Select Tempo</option>
                     <form method="POST" name="search" action="index.php">
                         <?php
                         if (! empty($TempoResult)) {
                             foreach ($TempoResult as $key => $value) {
                                 echo '<option value="' . $TempoResult[$key]['Tempo'] . '">' . $TempoResult[$key]['Tempo'] . '</option>';
                             }
                         }
                         ?>
                 </select><br> <br>
                 <form method="POST" name="search" action="testsearch.php">
         <div id="demo-grid">
             <div class="search-box">
                 <select id="Place" name="Tuning[]" multiple="multiple">
                     <option value="0" selected="selected">Select Tuning</option>
                     <form method="POST" name="search" action="testsearch.php">
                         <?php
                         if (! empty($TuningResult)) {
                             foreach ($TuningResult as $key => $value) {
                                 echo '<option value="' . $TuningResult[$key]['Tuning'] . '">' . $TuningResult[$key]['Tuning'] . '</option>';
                             }
                         }
                         ?>
                 </select><br> <br>
                 <form method="POST" name="search" action="testsearch.php">
         <div id="demo-grid">
             <div class="search-box">
                 <select id="Place" name="EntType[]" multiple="multiple">
                     <option value="0" selected="selected">Select Entry Type</option>
                     <form method="POST" name="search" action="testsearch.php">
                         <?php
                         if (! empty($EntTypeResult)) {
                             foreach ($EntTypeResult as $key => $value) {
                                 echo '<option value="' . $EntTypeResult[$key]['EntType'] . '">' . $EntTypeResult[$key]['EntType'] . '</option>';
                             }
                         }
                         ?>
                 </select><br> <br>
                 <form method="POST" name="search" action="testsearch.php">
         <div id="demo-grid">
             <div class="search-box">
                 <select id="Place" name="Recording[]" multiple="multiple">
                     <option value="0" selected="selected">Select Recording Type</option>
                     <form method="POST" name="search" action="testsearch.php">
                         <?php
                         if (! empty($RecordingResult)) {
                             foreach ($RecordingResult as $key => $value) {
                                 echo '<option value="' . $RecordingResult[$key]['Recording'] . '">' . $RecordingResult[$key]['Recording'] . '</option>';
                             }
                         }
                         ?>
                 </select><br> <br>
                 <form method="POST" name="search" action="index.php">
         <div id="demo-grid">
             <div class="search-box">
                 <select id="Place" name="RecYear[]" multiple="multiple">
                     <option value="0" selected="selected">Select Year</option>
                     <form method="POST" name="search" action="index.php">
                         <?php
                         if (! empty($RecYearResult)) {
                             foreach ($RecYearResult as $key => $value) {
                                 echo '<option value="' . $RecYearResult[$key]['RecYear'] . '">' . $RecYearResult[$key]['RecYear'] . '</option>';
                             }
                         }
                         ?>
                 </select><br> <br>
                 <button id="Filter">Search</button>
             </div>
             <?php
                 if (! empty($_POST['Genre'])) {
                     ?>
                     <table cellpadding="10" cellspacing="1">

                 <thead>
                     <tr>
                         <th><strong>id</strong></th>
                         <th><strong>Name</strong></th>
                         <th><strong>Genre</strong></th>
                         <th><strong>Key</strong></th>
                         <th><strong>Time Sig</strong></th>
                         <th><strong>Tempo</strong></th>
                         <th><strong>Tuning</strong></th>
                         <th><strong>Type</strong></th>
                         <th><strong>Recording</strong></th>
                         <th><strong>Year</strong></th>
                     </tr>
                 </thead>
                 <tbody>
                 <?php
                     $query = "SELECT * from test_table";
                     $i = 0;
                     $selectedOptionCount = count($_POST['Genre']);
                     $selectedOption = "";
                     while ($i < $selectedOptionCount) {
                         $selectedOption = $selectedOption . "'" . $_POST['Genre'][$i] . "'";
                         if ($i < $selectedOptionCount - 1) {
                             $selectedOption = $selectedOption . ", ";
                         }

                         $i ++;
                     }
                     $query = $query . " WHERE Genre in (" . $selectedOption . ")";

                     $result = $db_handle->runQuery($query);
                 }
                 if (! empty($result)) {
                     foreach ($result as $key => $value) {
                         ?>
                 <tr>
                         <td><div class="col" id="user_data_1"><?php echo $result[$key]['id']; ?></div></td>
                         <td><div class="col" id="user_data_2"><?php echo $result[$key]['NameUrl']; ?> </div></td>
                         <td><div class="col" id="user_data_3"><?php echo $result[$key]['Genre']; ?> </div></td>
                         <td><div class="col" id="user_data_4"><?php echo $result[$key]['KeySig']; ?> </div></td>
                         <td><div class="col" id="user_data_5"><?php echo $result[$key]['TimeSig']; ?> </div></td>
                         <td><div class="col" id="user_data_6"><?php echo $result[$key]['Tempo']; ?> </div></td>
                         <td><div class="col" id="user_data_7"><?php echo $result[$key]['Tuning']; ?> </div></td>
                         <td><div class="col" id="user_data_8"><?php echo $result[$key]['EntType']; ?> </div></td>
                         <td><div class="col" id="user_data_9"><?php echo $result[$key]['Recording']; ?> </div></td>
                         <td><div class="col" id="user_data_10"><?php echo $result[$key]['RecYear']; ?> </div></td>
                     </tr>
                 <?php
                     }
                     ?>

                 </tbody>
             </table>
             <?php
                 }
                 ?>  
         </div>
     </form>
 </body>
 </html>
             </div>
     </form>
 </body>
 </html>

ADAM 更新：DBController.php ... 像这样？？

     <?php
 class DBController {
     public $host = "localhost";
     public $user = "root";
     public $password = "password";
     public $database = "test";
     public $conn;

         function __construct() {
         $this->conn = $this->connectDB();
     }  
     function connectDB() {
         $conn = mysqli_connect($this->host,$this->user,$this- 
>password,$this->database);
         return $conn;
         $stmt = $db_handle->conn->prepare($query);
     }
         function runQuery($query) {
                 $result = mysqli_query($this->conn,$query);
                 while($row=mysqli_fetch_assoc($result)) {
                 $resultset[] = $row;
                 }      
                 if(!empty($resultset))
                 return $resultset;
     }
 }
 ?>

testsearch.php Browser Search - Image

testsearch.php Browser Results - Image

【问题讨论】：

  • 您的代码易受 SQL 注入攻击。您应该使用准备好的语句。

标签： php html mysql search


【解决方案1】：

我会在一个多维数组中得到过滤器

    include 'DBController.php';
    $db_handle = new DBController();
    $filters = [];

    $filters['Genre'] = array_column($db_handle->runQuery("SELECT DISTINCT Genre FROM test_table ORDER BY Genre ASC"), 'Genre');
    $filters['Tempo'] = array_column($db_handle->runQuery("SELECT DISTINCT Tempo FROM test_table ORDER BY Tempo ASC"), 'Tempo');
    $filters['KeySig'] = array_column($db_handle->runQuery("SELECT DISTINCT KeySig FROM test_table ORDER BY KeySig ASC"), 'KeySig');
    $filters['TimeSig'] = array_column($db_handle->runQuery("SELECT DISTINCT TimeSig FROM test_table ORDER BY TimeSig ASC"), 'TimeSig');
    $filters['Tuning'] = array_column($db_handle->runQuery("SELECT DISTINCT Tuning FROM test_table ORDER BY Tuning ASC"), 'Tuning');
    $filters['EntType'] = array_column($db_handle->runQuery("SELECT DISTINCT EntType FROM test_table ORDER BY EntType ASC"), 'EntType');
    $filters['Recording'] = array_column($db_handle->runQuery("SELECT DISTINCT Recording FROM test_table ORDER BY Recording ASC"), 'Recording');
    $filters['RecYear'] = array_column($db_handle->runQuery("SELECT DISTINCT RecYear FROM test_table ORDER BY RecYear ASC"),'RecYear');

在 中你应该只有一个

和所有

【讨论】：

  • 顺便说一句，在您的 DBController.php 中，您需要公开您的 $conn;并像这样使用它进行准备： $stmt = $db_handle->conn->prepare($query);
  • 嘿亚当！非常感谢人！我对此代码有几个问题，希望您能提供帮助。 1) 表格列不再自动出现在我的下拉选择器中。相反，每列都会出现“Array”一词。（例如，如果一列中有 5 个不同的条目，它将拉出 5 个选项都说“Array”..）并且它继续为所有其他选择菜单执行此操作。 ..它似乎正在识别每列中有多少条目。
  • 2.当我选择某些内容并点击搜索时，不会返回任何结果，而是遇到错误 a。 “注意：未定义的变量：/Users/jamiebekyarovich/Sites/testsearch2.php 中的 stmt 第 196 行”致命错误：b。 “未捕获的错误：在第 196 行的 /Users/jamiebekyarovich/Sites/testsearch2.php 中的 null 上调用成员函数 bind_param()” c。 “错误：在第 196 行的 /Users/jamiebekyarovich/Sites/testsearch2.php 中调用 null 上的成员函数 bind_param()”
  • 196 处的代码 = $stmt->bind_param(str_repeat('s',count($params)), ...$params);我已包含 $stmt = $db_handle->conn->prepare($query);在我的 DBController.php 中，但我不确定我是否把它放在正确的位置。更新的 DBController.php 包含在已编辑的帖子中
  • 我更新了我的答案，现在试试代码。我在获取过滤器时添加了 array_column，DBController public $conn 和它的使用，用于准备语句。
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