PHP & MySQL , 获取表

Question

我必须让这段代码返回相同的结果，但仅限于 userID 是数字的地方(例如 16)； 每个设备在此表中都有一个用户 ID 和一个用户名。 这是代码:

<?php 

$myQuery= 'SELECT * FROM devicesissued di LEFT JOIN usercred uc ON di.userID = uc.userID WHERE 1 ORDER BY timeStamp DESC';
$result = mysql_query($myQuery) or die($myQuery."<br/><br/>".mysql_error());
while($row = mysql_fetch_array($result)) 
{
    $catQuery = 'SELECT * FROM deviceinventory WHERE deviceID = '. $row['deviceID'];
    $catResult = mysql_query($catQuery) or die($catQuery."<br/><br/>".mysql_error());
    $cat = mysql_fetch_array($catResult);
  echo "<tr>";
  echo "<td>" . $row['displayName'] . "</td>";
  echo "<td>" . $row['deviceID'] . "</td>";
  echo "<td>" . $cat['barCodeID'] . "</td>";
  echo "<td>" . $cat['category'] . "</td>";
  echo "<td>" . $row['deviceName'] . "</td>";
  echo "<td>" . $cat['operatingSystem'] . "</td>";
  echo "<td>" . $cat['serialNumber'] . "</td>";
  echo "<td>" . $cat['macAddress'] . "</td>";
  echo "<td>" . $row['timeStamp'] . "</td>";
  echo "</tr>";
}

?>

如果我添加 WHERE 'userID' = A-Number 子句，它不会执行任何操作。

如果您有任何想法，我很乐意尝试。

谢谢。

Answer 1

试着稍微改变一下你的查询

$myQuery= 'SELECT * FROM devicesissued di 
             LEFT JOIN usercred uc ON di.userID = uc.userID 
             WHERE di.userID=the_number_here ORDER BY timeStamp DESC';

由于您在两个连接表(deviceissued 和 usercred)中都有用户 ID，因此您必须告诉 MySQL 您要在哪个表上执行 WHERE-子句。