SQL 从第一个 table 中拆分逗号分隔列表,并根据此列表打印第二个 table 中的内容

SQL Split comma separated list from one table and print content from second table based upon this list

我有两个 table,roomsutilities。 在名为 rooms 的 table 中,我有一个也称为 utilities 的列。此列存储引用 table utilities.

中 ID 的逗号分隔数字

如何拆分(分解?)utilities 列中的值,并将它们与 utilities table 中的值进行匹配,将具有匹配 ID 的值打印为 spitted值?

示例:

Table:房间数
|----------------|----------------|---------------- -|
| ID | 姓名 | 实用工具 |
|----------------|----------------|---------------- -|
| 1 |房间 1 | 1,3,4 |
|----------------|----------------|---------------- -|

Table:公用事业
|----------------|----------------|
| ID | 设备 |
|----------------|----------------|
| 1 |演讲者 |
|----------------|----------------|
| 2 |电视 |
|----------------|----------------|
| 3 |智能电视 |
|----------------|----------------|
| 4 |网络摄像头|
|----------------|----------------|

我想打印这样的东西:
Room1: Speakers, Smart TV, Web camera

这是我目前所拥有的,confroomreport.php:

<?php
 require_once("db.php");
 $util = $conn->getDeviceList();
 $arr = $conn->getConfRoomList();
?>


<table border='1'>
    <tr>
        <th>Room</th>
        <th>Utilities</th>
    </tr>
    <?php for( $i=0; $i < count($arr); $i++) {
    print_r  ("<tr>
     <td>".$arr[$i]['name']."</td>
     <td>".$arr[$i]['utilities']."</td>
     </tr>"); } ?>
</table>

并在 db.php

public function getDeviceList()
    {
          $arr = array();
          $statement = $this->conn->prepare("SELECT id, device from utilities order by device ASC");
          $statement->bind_result($id, $device);
          $statement->execute();
          while ($statement->fetch()) {
            $arr[] = [ "id" => $id, "device" => $device];
          }
          $statement->close();

          return $arr;
    }

public function getConfRoomList()
  {
      $arr = array();
      $statement = $this->conn->prepare("SELECT id, name, utilities from rooms order by name ASC");
      $statement->bind_result($id, $name, $utilities);
      $statement->execute();
      while ($statement->fetch()) {
      $arr[] = [ "id" => $id, "name" => $name, "utilities" => $utilities];
      }
      $statement->close();

      return $arr;
  }

根据已接受的解决方案编辑更新代码:

我把这个添加到我的 db.php:

  public function joinDevRoom()
  {
     $arr = array();
     $statement = $this->conn->prepare("SELECT r.name,GROUP_CONCAT(u.device) FROM room r LEFT JOIN utilities u ON FIND_IN_SET(u.id,r.utilities)>0 GROUP BY r.id");
     $statement->bind_result($id, $utilities);
     $statement->execute();
     while ($statement->fetch()) {
       $arr[] = [ "id" => $id, "utilities" => $utilities];
     }
     $statement->close();

     return $arr;
  }

这是我更新的 confroomreport.php:

<?php
 require_once("db.php");
 $arr = $conn->getConfRoomList();
 $join = $conn->joinDevRoom();
?>


<table border='1'>
    <tr>
        <th>Room</th>
        <th>Utilities</th>
    </tr>
    <?php for( $i=0; $i < count($arr); $i++) {
     print_r  ("<tr>
     <td>".$arr[$i]['name']."</td>"); }
     for( $u=0; $u < count($join); $u++) {
     print_r ("<td>".$join[$u]['utilities']."</td>
     </tr>"); } ?>
    </table>

试试这个

SELECT r.Name,GROUP_CONCAT(u.Device) FROM rooms r
LEFT JOIN utilities u ON FIND_IN_SET(u.id,r.Utilities)>0
GROUP BY r.ID