我试图通过SQL查询和PHP包装器使用FusionCharts生成折线图。我无法弄清楚如何将另一个数据集添加到图形中并进行渲染。我假设我将需要两个SQL查询，然后以某种方式将它们加载到数组中？附上是我的代码。
<?php
/* Include the `fusioncharts.php` file that contains functions to embed the charts. */
include("includes/fusioncharts.php");
/* The following 4 code lines contain the database connection information. Alternatively, you can move these code lines to a separate file and include the file here. You can also modify this code based on your database connection. */
$hostdb = "127.0.1.1"; // MySQl host
$userdb = "test"; // MySQL username
$passdb = "test"; // MySQL password
$namedb = "weather"; // MySQL database name
// Establish a connection to the database
$dbhandle = new mysqli($hostdb, $userdb, $passdb, $namedb);
/*Render an error message, to avoid abrupt failure, if the database connection parameters are incorrect */
if ($dbhandle->connect_error) {
exit("There was an error with your connection: ".$dbhandle->connect_error);
}
?>
<html>
<head>
<title>Chart Development</title>
<link rel="stylesheet" type="text/css" href="css/style.css" />
<!-- You need to include the following JS file to render the chart.
When you make your own charts, make sure that the path to this JS file is correct.
Else, you will get JavaScript errors. -->
<script src="fusioncharts/fusioncharts.js"></script>
</head>
<body>
<?php
// Form the SQL query that returns the results
$strQuery = "select AVG(temperature) as avgtemp, AVG(humidity) as avghum, MONTHNAME (date) as date FROM data WHERE date BETWEEN '2008-01-01' AND '2016-01-01' GROUP BY MONTH (date) ORDER BY MONTH (date) ASC";
// Execute the query, or else return the error message.
$result = $dbhandle->query($strQuery) or exit("Error code ({$dbhandle->errno}): {$dbhandle->error}");
// Form the SQL query that returns the results
$strQuery2 = "select AVG(humidity) as avghum, MONTHNAME (date) as date FROM data WHERE date BETWEEN '2008-01-01' AND '2016-01-01' GROUP BY MONTH (date) ORDER BY MONTH (date) ASC";
// Execute the query, or else return the error message.
$result2 = $dbhandle->query($strQuery2) or exit("Error code ({$dbhandle->errno}): {$dbhandle->error}");
// If the query returns a valid response, prepare the JSON string
if ($result) {
// The `$arrData` array holds the chart attributes and data
$arrData = array(
"chart" => array(
"caption" => "Averages Per Month",
"paletteColors" => "#6c7377",
"bgColor" => "#ffffff",
"borderAlpha"=> "20",
"canvasBorderAlpha"=> "0",
"usePlotGradientColor"=> "0",
"plotBorderAlpha"=> "10",
"showXAxisLine"=> "1",
"xAxisLineColor" => "#999999",
"showValues" => "0",
"divlineColor" => "#999999",
"divLineIsDashed" => "1",
"showAlternateHGridColor" => "0"
)
);
$arrData["data"] = array();
// Push the data into the array
while($row = mysqli_fetch_array($result)) {
array_push($arrData["data"], array(
"label" => $row["date"],
"value" => $row["avgtemp"]
)
);
}
/*JSON Encode the data to retrieve the string containing the JSON representation of the data in the array. */
$jsonEncodedData = json_encode($arrData);
/*Create an object for the column chart using the FusionCharts PHP class constructor. Syntax for the constructor is ` FusionCharts("type of chart", "unique chart id", width of the chart, height of the chart, "div id to render the chart", "data format", "data source")`. Because we are using JSON data to render the chart, the data format will be `json`. The variable `$jsonEncodeData` holds all the JSON data for the chart, and will be passed as the value for the data source parameter of the constructor.*/
$lineChart = new FusionCharts("line", "myFirstChart" , 600, 300, "chart-1", "json", $jsonEncodedData);
// Render the chart
$lineChart->render();
// Close the database connection
$dbhandle->close();
}
?>
<div id="chart-1"><!-- Fusion Charts will render here--></div>
</body>
</html>