Php 如何使用SQL查询从折线图数组中的DB中获取值
我正在尝试使用下面的代码从DB中获取线图的数据Php 如何使用SQL查询从折线图数组中的DB中获取值,php,Php,我正在尝试使用下面的代码从DB中获取线图的数据 <?php $dataPoints = array( $sql1 = "SELECT * FROM chart_data_column WHERE value = 'now'"; $result1 = $conn->query($sql1); if ($result1->num_rows > 0) {
<?php
$dataPoints = array(
$sql1 = "SELECT * FROM chart_data_column WHERE value = 'now'";
$result1 = $conn->query($sql1);
if ($result1->num_rows > 0) {
while($row1 = $result1->fetch_assoc()) {
array("y" => 25, "label" => "Sunday"), ?>
} } else { }
);
?>
<script>
window.onload = function () {
var chart = new CanvasJS.Chart("chartContainer", {
title: {
text: ""
},
axisY: {
title: ""
},
data: [{
type: "line",
dataPoints: <?php echo json_encode($dataPoints, JSON_NUMERIC_CHECK); ?>
}]
});
chart.render();
}
</script>
<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>
<div id="chartContainer" style="height: 370px; width: 100%;"></div>
将整个查询放入数组中。你需要把它们分开。此外,您还有“图表\数据\列”,表名应该在其中
$dataPoints = array();
$sql1 = "SELECT * FROM chart_data_column WHERE value = 'now'";
$result1 = $conn->query($sql1);
if ($result1->num_rows > 0) {
while ($row = $result1->fetch_assoc()) {
$dataPoints[] = $row;
}
}
我不得不赞扬你将PHP代码和JavaScript分开。这是一个非常好的主意。但是,如果您想使用PHP和mysqli库从MySQL获取所有记录,则不需要任何循环。您只需将所有内容提取到一个数组中,然后使用JavaScript中的json\u encode()
显示即可
<?php
// import your mysqli connection before
$result1 = $conn->query("SELECT * FROM chart_data_column WHERE value = 'now'");
$dataPoints = $result1->fetch_all(MYSQLI_ASSOC);
?>
<script>
window.onload = function () {
var chart = new CanvasJS.Chart("chartContainer", {
title: {
text: ""
},
axisY: {
title: ""
},
data: [{
type: "line",
dataPoints: <?= json_encode($dataPoints, JSON_NUMERIC_CHECK); ?>
}]
});
chart.render();
}
</script>
这里我如何将提取的值分配给x和y。。像array(“y”=>25,“label”=>“Sunday”),?>
Sunday&25在给定的静态数据中。?$row[0]将为您提供第一个返回的列值,$row[1]第二个等。这里我有两个列值,需要获取