PHP：显示一个列阵列字段

Question

这是antivirus_detail表：

+-----------------------------+--------------+------+-----+---------+----------- 

| Field      | Type   | Null | Key | Default | Extra 
| 
+-----------------------------+--------------+------+-----+---------+----------- 

| Emp_id      | int(11)  | YES | MUL | NULL | 

| Computer_id     | int(11)  | YES | MUL | NULL | 

| Antivirus_id    | int(11)  | NO | PRI | NULL |auto_incre 
                      ment 
| Antivirus_name    | varchar(50) | YES |  | NULL | 

| Antivirus_key    | varchar(50) | YES |  | NULL | 

| Antivirus_installation_date | date   | YES |  | NULL | 

| Antivirus_expiration_date | date   | YES |  | NULL | 

这是hardware_description表：

+------------------+--------------+------+-----+---------+----------------+ 
| Field   | Type   | Null | Key | Default | Extra   | 
+------------------+--------------+------+-----+---------+----------------+ 
| Computer_id  | int(11)  | NO | PRI | NULL | auto_increment | 
| Emp_id   | int(11)  | NO | MUL | NULL |    | 
| PC_type   | varchar(20) | YES |  | NULL |    | 
| Operating_system | varchar(20) | YES |  | NULL |    | 
| Product_key  | varchar(30) | YES |  | NULL |    | 
| Assign_date  | date   | YES |  | NULL |    | 

EMP_ID是从一个不同的员工表& COMPUTER_ID这两个表的外键是来自hardware_description表的防病毒表中的外键。

这是我的PHP代码：

<?php require_once 'includes/dbconnection.php'; ?> 
<?php require_once 'includes/functions.php'; ?> 

<?php 
    $id="1"; 

    $sql ="SELECT b.*, c.* FROM hardware_description b, antivirus_detail c WHERE b.Computer_id = c.Computer_id AND c.Emp_id = '$id'"; 

    $result = mysqli_query($connection, $sql); 
    //var_dump($result); 

?> 

    <table cellpadding="5" border="0"> 
     <tr> 
      <th style="text-align: left;">Employee ID</th> 
      <th style="text-align: left;">Computer ID</th> 
      <th style="text-align: left;">Operating System</th> 
      <th style="text-align: left;">PC Type</th> 
      <th style="text-align: left;">Antivirus ID</th> 

     </tr> 
    <?php while($row = mysqli_fetch_array($result)) { ?> 
     <tr> 
      <td><?php echo $row['Emp_id']; ?></td> 
      <td><?php echo $row['Computer_id']; ?></td> 
      <td><?php echo $row['Operating_system']; ?></td> 
      <td><?php echo $row['PC_type']; ?></td> 
      <td><?php echo $row['Antivirus_id']; ?></td> 

     </tr> 
    <?php 
    } 
    ?> 
    </table> 

现在，这显示：

Employee ID Computer ID Operating System PC Type Antivirus ID 
1   2   Windows XP  Desktop 1   
1   2   Windows XP  Desktop 2 

我所要的输出是这样的：

Employee ID Computer ID Operating System PC Type Antivirus ID 
1    2   Windows XP  Desktop 1,2 

我希望所有的杀毒软件跳到计算机ID的ID将显示为数组。我如何实现这一目标？

Answer 1

在您的查询中，您必须使用GROUP_CONCAT来连接Antivirus_ids。

把你的SQL查询改成这样;

$sql ="SELECT b.Emp_id, b.Computer_id, b.Operating_system, b.PC_type, GROUP_CONCAT(c.Antivirus_id SEPARATOR ', ') as concatenated_ids FROM hardware_description b, antivirus_detail c WHERE b.Computer_id = c.Computer_id AND c.Emp_id = '$id' GROUP BY c.Antivirus_id"; 

而且在获取数据方面改变这个$row['Antivirus_id'];到$row['concatenated_ids'];。