我正在从 MySQL 数据库中提取数据并使用 Flot 进行绘图。我的问题出在我们的数据库设计中。
我有 1 个包含以下列的表:
- ID(自动递增)(键)
- 时间戳
- SensorData(看起来像:34534.3 32452.4 23454.6 6523.45 67546.4 2233)
我想解析我的传感器数据,以便可以使用单个传感器数据创建 Flot 图。现在,我能够绘制 ID vs Timestamp 并且有效。这是我的代码:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Flot Examples</title>
<link href="layout.css" rel="stylesheet" type="text/css">
<!--[if lte IE 8]><script language="javascript" type="text/javascript" src="js/flot/excanvas.min.js"></script><![endif]-->
<script language="javascript" type="text/javascript" src="js/flot/jquery.js"></script>
<script language="javascript" type="text/javascript" src="js/flot/jquery.flot.js"></script>
</head>
<body>
<h1>Title</h1>
<div id="placeholder" style="width:600px;height:300px;"></div>
<?php
$server = "www.freesql.org";
$user="username";
$password="password";
$database = "database";
$connection = mysql_connect($server,$user,$password);
$db = mysql_select_db($database,$connection);
$query = "SELECT Id, localtme FROM varia";
$result = mysql_query($query);
while($row = mysql_fetch_assoc($result))
{
$dataset1[] = array($row['Id'],$row['localtme']);
}
?>
<script type="text/javascript">
$(function () {
var dataset1 = <?php echo json_encode($dataset1); ?>;
$.plot($("#placeholder"), [ dataset1 ]);
});
</script>
</body>
</html>