如何用mysql数据库中的数据填充google折线图(单文件/内联解决方案)

jum4pzuy  于 2021-06-15  发布在  Mysql
关注(0)|答案(1)|浏览(291)

我有一个带温度和湿度传感器的mcu（esp8266）。mcu通过mqtt将测量数据发送到在我的synology nas上运行的mqtt代理。在nas上运行的还有一个mqtt客户机（node.js），它将接收到的数据写入nas上的mysql数据库。最后，web服务器和php服务器也在nas上运行。
现在我想做一个网站来显示数据库的数据作为一个折线图。
问题：
如何用mysql数据库中的数据填充google折线图？
是否可以使用一个文件（.php）来执行此操作？
如何管理日期范围选择？
如何选择/取消选择图表上的行？

mysqlchartsgoogle-visualizationflatpickr

1条答案

按热度按时间
ca1c2owp

ca1c2owp1#

这是我对我问题的回答。
由于我对所使用的编程语言没有太大的概念，我不得不在网上搜索、阅读和测试大量的源代码，以便将结果复制到一起：-）我将在将来对其进行一些扩展，但对我来说，它工作得非常完美。
我想在这里介绍这个解决方案，以帮助其他人开始。但是，当然有很多方法可以改进代码。如果有人愿意，我很乐意接受建议。在github上完成文件。https://github.com/diydave/mysql-and-google-line-chart
PHP。从数据库读取数据并将json字符串返回到javascript

<?php
function getData(){
 // Connect to MySQL (db Hostname/IP, user, password, database)
    $link = new mysqli( '192.168.10.10', 'user', 'password', 'mymqttdb' );
    if ( $link->connect_errno ) {
        die( "Failed to connect to MySQL: (" . $link->connect_errno . ") " . $link->connect_error );
    }   
    $start = $_GET['startDate'];        // Get parameter from URL
    $ende = $_GET['endDate'];           // Get parameter from URL

    if (!isset($endDate )){             // No end date? then actual for end
        $endDate = date('Y-m-d H:i', time());
    }   
    if (!isset($startDate )){           // No start date? then actual -1 day for start
        $startDate = date('Y-m-d H:i', strtotime('-1 day', strtotime($ende)));
    }
    // Query in SQL ! add your own columns and database table name!
    $query= "SELECT `DateTime`,`temperature`,`humidity` FROM `Chickenhouse` WHERE `DateTime` BETWEEN" . "'" . $startDate ."'" . "AND" . "'" . $endDate ."'";
    $result = $link->query($query);     // make db query

    $rows = array();
    $table = array(); 

    $table['cols'] = array
    (
        array('label' => 'Date Time', 'type' => 'datetime'),
        array('label' => 'Temperatur (°C)', 'type' => 'number'),        // Select your label for the index
        array('label' => 'Luftfeuchtigkeit (%)', 'type' => 'number')    // Select your label for the index
    ); 

    while($row = mysqli_fetch_array($result))       // got to all the lines of the query result
    {
        $sub_array = array();
        $date1 = new DateTime($row['DateTime']);
        $date2 = "Date(".date_format($date1, 'Y').", ".((int) date_format($date1, 'm') - 1).", ".date_format($date1, 'd').", ".date_format($date1, 'H').", ".date_format($date1, 'i').", ".date_format($date1, 's').")";
        $sub_array[] =  array("v" => (string)$date2);
        $sub_array[] =  array("v" => $row["temperature"]);
        $sub_array[] =  array("v" => $row["humidity"]);
        $rows[] =  array("c" => $sub_array);
    }
    $table['rows'] = $rows;
    $lineCount = count($rows);                          // Number of array fields (lines) to show in browser
    return array(json_encode($table), $lineCount);      // Make JSON from array and give it to the java script together with linecount
}
?>

css和html。或多或少只是为了格式化和设置占位符。

<html>
<head>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.2.3/flatpickr.css">
<style>

* {font-family:Arial;}

    .page-wrapper{ width:90%; margin:0 auto; }
    input { border: 2px solid whitesmoke;border-radius: 12px; padding: 12px 10px; text-align: center;  font-size: 16px; font-weight: bold; width: 250px;background: cornflowerblue; color: yellow;}
    button { border: none; border-radius: 10px; text-align: center; padding: 12px 10px; cursor: pointer; font-weight: bold; background: cornflowerblue; color: white;}
</style>
</head>
<body>
    <div class="page-wrapper">  </div>  
    <input type="text" style="float:left" id="rangeDate" placeholder="Select Timespan" data-input>
    <br>
    <p id="LineCount" > </p>
    <div id="line_chart" style="width: 100%; height: 800px"></div>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/flatpickr/4.2.3/flatpickr.js"></script>
    <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
    <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/flatpickr"></script>

javascript。谷歌图表。接受json数据并将其显示为折线图。这里有许多可能的选择。详情如下：https://developers.google.com/chart/interactive/docs/gallery/linechart

// Setup and show Google line chart
google.charts.load('current', {'packages':['corechart']});
google.charts.setOnLoadCallback(drawChart);
function drawChart(){
    var data = new google.visualization.DataTable(<?php echo getData()[0]?>);       //  Call PHP-Function an receive JSON
    document.getElementById("LineCount").innerHTML= "  " + <?php echo getData()[1]?> + " Records loaded";   // Get record count
    var options = {
        series: {
            0:{color: 'red', visibleInLegend: true, targetAxisIndex: 0},
            1:{color: 'blue', visibleInLegend: true, targetAxisIndex: 1}
        },
        vAxes: {
            // Adds labels to each axis; they don't have to match the axis names.
            0: {title: 'Temp (°C)' }, // , 'minValue': 0, 'maxValue': 30
            1: {title: 'Feuchte(%)'}
        },
        title:'Chickenhouse',
        legend:{position:'top'},
        chartArea:{width:'75%', height:'65%'},
        //curveType: 'function',
        hAxis: {
            title: 'Datum',  titleTextStyle: {color: '#333'},
            format: 'd.M HH:mm',
            slantedText:true, slantedTextAngle:80
        },
        explorer: { 
            actions: ['dragToPan', 'dragToZoom', 'rightClickToReset'],  // 'dragToZoom' 
            axis: 'horizontal',
            keepInBounds: true,
            maxZoomIn: 28.0,
            maxZoomOut: 1.0,
            zoomDelta: 1.5
        },
        colors: ['#D44E41'],
    };
    var date_formatter = new google.visualization.DateFormat({ // Tooltip format
    pattern: "dd.MM.yyyy -   HH:mm"
    }); 
    date_formatter.format(data, 0);
    var chart = new google.visualization.LineChart(document.getElementById('line_chart'));
    chart.draw(data, options);

javascript。通过单击图例选择显示的行。

// Select / deselect lines by clicking on the label
    var columns = [];
var series = {};
for (var i = 0; i < data.getNumberOfColumns(); i++) {
    columns.push(i);
    if (i > 0) {
        series[i - 1] = {};
    }
}
google.visualization.events.addListener(chart, 'select', function () {
    var sel = chart.getSelection();
    // if selection length is 0, we deselected an element
    if (sel.length > 0) {
        // if row is undefined, we clicked on the legend
        if (sel[0].row === null) {
            var col = sel[0].column;
            if (columns[col] == col) {
                // hide the data series
                columns[col] = {
                    label: data.getColumnLabel(col),
                    type: data.getColumnType(col),
                    calc: function () {
                        return null;
                    }
                };

                // grey out the legend entry
                series[col - 1].color = '#CCCCCC';
            } else {
                // show the data series
                columns[col] = col;
                series[col - 1].color = null;
            }
            var view = new google.visualization.DataView(data);
            view.setColumns(columns);
            chart.draw(view, options);
        }
    }
});

};
javascript。弗拉特皮克。酷javascript应用程序选择日期和时间。也可以选择我在这里使用的日期范围。https://flatpickr.js.org/

// Flatpickr to select date range
$("#rangeDate").flatpickr({
    enableTime: false,
    mode: 'range',
    time_24hr: true,
    dateFormat: "Y-m-d",
    maxDate: "today",
    defaulDate: "today",
    onClose: function test(selectedDates, dateStr, instance){
        arDateTime = dateStr.split(" to ");
        dateTimeStart = arDateTime[0] + " 00:00" ;
        dateTimeEnd =  arDateTime[1] + " 23:59" ;
        strNeu = "?startDate=" + dateTimeStart + "&endDate=" + dateTimeEnd;
        window.location = strNeu;
    },
});

在github上完成文件。https://github.com/diydave/mysql-and-google-line-chart
结果：截图

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