Question

我首先要说的是，这是我在堆栈的第一个问题，如果此问题已经得到解答，我会提前道歉，但是到目前为止我还没有找到答案或自己解决。

我试图在php文件中使用SELECT函数来运行基本报告。我在PHPMyAdmin中编写了SQL并使用convert-to-php按钮来做到这一点。我得到的是以下内容：

SELECT
l.id AS 'ID',
l.type AS 'Type',
l.state AS 'State',
l.won_at AS 'Won',
l.lost_at AS 'Lost',
l.cancelled_at AS 'Cancelled',
l.created_at AS 'Created',
l.source AS 'Source',
u.first_name AS 'Owner First Name',
u.last_name AS 'Owner Last Name'
FROM `leads` AS l
LEFT JOIN `users` AS u ON
(u.`id` = l.`owner_id`)
LEFT JOIN `regions` AS rg ON
(rg.`id` = l.`region`)
WHERE l.`state` IS NOT NULL
[...]";

当我将它放入PHP文档时，它看起来像这样：

    <?php
// Create connection
$con=mysqli_connect("localhost","root","pass","database");

// Check connection
if (mysqli_connect_errno($con))
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
  }

// And now for the good stuff

$result = mysqli_query($con,"SELECT
l.id AS 'LeadID',
l.type AS 'Type',
l.state AS 'State',
l.won_at AS 'Won',
l.lost_at AS 'Lost',
l.cancelled_at AS 'Cancelled',
l.created_at AS 'Created',
l.source AS 'Source',
u.first_name AS 'First Name',
u.last_name AS 'Last Name'
FROM `leads` AS l
LEFT JOIN `users` AS u ON
(u.`id` = l.`owner_id`)
WHERE l.`state` IS NOT NULL
");

echo "<table border='1'>
<tr>
<th>Test1</th>
<th>Test2</th>
</tr>";

while($row = mysqli_fetch_array($result))
  {
  echo "<tr>";
  echo "<td>" . $row["$LeadID"] . "</td>";
  echo "<td>" . $row["$l.type"] . "</td>";
  echo "</tr>";
  }
echo "</table>";

mysqli_close($con);
?>

似乎正在发生的事情是，只有当只选择了一个数据库时才能创建没有问题的表，当我使用LEFT JOIN时，我到目前为止无法找到更改方法的方法。 $ row [“$ variable”]输入可以工作的东西。

我知道数据存在，我知道连接有效，只是LEFT JOIN给我带来了一些麻烦。

对此的任何帮助将不胜感激！

Answer 1

使用：

echo "<td>" . $row["LeadID"] . "</td>";
echo "<td>" . $row["Type"] . "</td>";

您不需要$，这些只是文字字符串而不是变量的值。密钥区分大小写，因此您必须使用Type，而不是type。

Answer 2

我认为最好使用foreach而不是像这样：

$rows = mysqli_fetch_array($result);
foreach ($rows as $value)
{
  echo "<tr>";
  echo "<td>" . $value["LeadID"] . "</td>";
  echo "<td>" . $value["Type"] . "</td>";
  echo "</tr>";
}
echo "</table>";

在PHP中使用带有LEFT JOIN的$ row [$ variable]时出现空结果

2 个答案: