Question

我需要通过PHP查询选择日期类型字段。当我尝试将值修改为d-m-Y类型时，问题就表明了。我需要格式化这些数据，以便使用AJAX在图表中显示它。

如果我在Heidi中进行查询，它可以正常工作，但如果我通过PHP尝试它，我会收到以下错误：

MySQL查询：

SELECT COUNT(id) as total, DATE_FORMAT(login_at, '%d-%m-%Y') as datee FROM connections
    WHERE login_at BETWEEN DATE_SUB(CURDATE(), INTERVAL 30 DAY) AND NOW()
    GROUP BY datee;

PHP查询：

//查询从表中获取数据

$query = sprintf("SELECT COUNT(id) as total, login_at as datee
FROM connections
    WHERE login_at BETWEEN DATE_SUB(CURDATE(), INTERVAL 30 DAY) AND NOW()
    GROUP BY datee;");

//执行查询

$result = $mysqli->query($query);

//遍历返回的数据

$data = array();
foreach ($result as $row) {
    $data[] = $row;
}

//现在打印数据

print json_encode($data);

错误：

<br />
<b>Warning</b>:  sprintf(): Too few arguments in <b>C:\xampp\htdocs\chartjs-master\php-mysql-chartjs\data.php</b> on line <b>24</b><br />
<br />
<b>Warning</b>:  mysqli::query(): Empty query in <b>C:\xampp\htdocs\chartjs-master\php-mysql-chartjs\data.php</b> on line <b>30</b><br />
<br />
<b>Warning</b>:  Invalid argument supplied for foreach() in <b>C:\xampp\htdocs\chartjs-master\php-mysql-chartjs\data.php</b> on line <b>34</b><br />
<br />
<b>Fatal error</b>:  Uncaught Error: Call to a member function close() on boolean in C:\xampp\htdocs\chartjs-master\php-mysql-chartjs\data.php:40
Stack trace:
#0 {main}
  thrown in <b>C:\xampp\htdocs\chartjs-master\php-mysql-chartjs\data.php</b> on line <b>40</b><br />

我搜索并尝试了我在互联网上找到的每一个解决方案，但没有取得任何成功。

PHP中的DATE_FORMAT查询来自MySQL的错误

0 个答案: