Question

所以以下代码是我用来尝试使用pchart生成图形的代码。我已经能够生成一些图形。目前的图表如下所示：http://befoz.netau.net/charts.php它应该看起来像http://befoz.netau.net/chart2.php第二个图表基于我手动输入的值。我想要做的是从mysql数据库中检索数据，而无需手动输入数据，因此动态生成图表。

这是我的代码。我不确定是否是导致图表不生成响应的查询或不正确的数组。

<?php    
/* CAT:Bar Chart */ 

/* pChart library inclusions */ 
include("pchart/class/pData.class.php"); 
include("pchart/class/pDraw.class.php");
include("pchart/class/pImage.class.php"); 

/* Create and populate the pData object */ 
$myData = new pData();   
$myData->addPoints(array($Yes,$Result)); 
$myData->addPoints(array($No,$Result));
$myData->addPoints(array($Undecided,$Result));
$myData->setAxisName(0,"Number of Responses"); 
$myData->addPoints(array("Yes","No","Undecided"),"Types of Responses"); 
$myData->setSerieDescription("Types of Responses","Types of Responses"); 
$myData->setAbscissa("Types of Responses"); 
$myData->setAbscissaName("Types of Responses"); 

/* Connect to the MySQL database */

$db = mysql_connect("host", "user", "pass");
mysql_select_db("thedatabase",$db);

/* Build the query that will returns the data to graph */

$Requete = "SELECT `Do you have an interest in Green IT` FROM `replies`";

$Result  = mysql_query($Requete,$db);
$Yes=""; $No=""; $Undecided="";
while($row = mysql_fetch_array($Result))
{

/* Push the results of the query in an array */
$Yes[]   = $row["Yes"];
$No[] = $row["No"];
$Undecided[] = $row["Undecided"];
}

/* Create the pChart object */ 
$myPicture = new pImage(500,500,$myData); 
$myPicture->drawGradientArea(0,0,500,500,DIRECTION_VERTICAL,array("StartR"=>240,"StartG"=>240,"StartB"=>240,"EndR"=>180,"EndG"=>180,"EndB"=>180,"Alpha"=>100)); 
$myPicture->drawGradientArea(0,0,500,500,DIRECTION_HORIZONTAL,array("StartR"=>240,"StartG"=>240,"StartB"=>240,"EndR"=>180,"EndG"=>180,"EndB"=>180,"Alpha"=>20)); 
$myPicture->setFontProperties(array("FontName"=>"pchart/fonts/pf_arma_five.ttf","FontSize"=>6)); 

/* Draw the chart scale */  
$myPicture->setGraphArea(100,30,480,480); 
$myPicture->drawScale(array("CycleBackground"=>TRUE,"DrawSubTicks"=>TRUE,"GridR"=>0,"GridG"=>0,"GridB"=>0,"GridAlpha"=>10,"Pos"=>SCALE_POS_TOPBOTTOM)); 

/* Turn on shadow computing */  
$myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>10)); 

/* Create the per bar palette */ 
$Palette = array("0"=>array("R"=>188,"G"=>224,"B"=>46,"Alpha"=>100), 
              "1"=>array("R"=>224,"G"=>100,"B"=>46,"Alpha"=>100), 
              "2"=>array("R"=>224,"G"=>214,"B"=>46,"Alpha"=>100), 
              "3"=>array("R"=>46,"G"=>151,"B"=>224,"Alpha"=>100), 
              "4"=>array("R"=>176,"G"=>46,"B"=>224,"Alpha"=>100), 
              "5"=>array("R"=>224,"G"=>46,"B"=>117,"Alpha"=>100), 
              "6"=>array("R"=>92,"G"=>224,"B"=>46,"Alpha"=>100), 
              "7"=>array("R"=>224,"G"=>176,"B"=>46,"Alpha"=>100)); 

 /* Draw the chart */  
 $myPicture->drawBarChart(array("DisplayPos"=>LABEL_POS_INSIDE,"DisplayValues"=>TRUE,"Rounded"=>TRUE,"Surrounding"=>30,"OverrideColors"=>$Palette)); 

/* Write the legend */  
$myPicture->drawLegend(570,215,array("Style"=>LEGEND_NOBORDER,"Mode"=>LEGEND_HORIZONTAL)); 

/* Render the picture (choose the best way) */ 
$myPicture->autoOutput("pictures/example.drawBarChart.palette.png"); 
?>

所以我的结构在php my admin

中看起来像这样

ROWS Do you have an interest in Green IT
9    No
3    Undecided
16   Yes



CREATE TABLE `replies` (
`ID` INTEGER NOT NULL AUTO_INCREMENT, 
`Do you have an interest in Green IT` VARCHAR(50), 
`Do you think Green IT is a good a thing` VARCHAR(50), 
`Would you welcome Green IT if it helped the environment` VARCHAR(255),
`Would you welcome Green IT if you saved money` VARCHAR(255), 
`Incentive for welcoming Green IT` VARCHAR(50),
`Is UEL doing enough to implement Green IT` VARCHAR(255), 
`Do you like Green IT Modules` VARCHAR(50),
`Your rough monthly cost on travel to UEL` VARCHAR(255), 
`Additional comments` VARCHAR(50),
`Should there be more green modules at UEL` VARCHAR(255), 
`What Year of Study Are you In` VARCHAR(50),
`If you did not fill in the quesionnaire, why not` VARCHAR(255), 
PRIMARY KEY (`ID`)
) ENGINE=myisam DEFAULT CHARSET=utf8;

我哪里错了？

由于

Answer 1

假设每个受访者有一条记录，查询应该是这样的 -

SELECT `Do you have an interest in Green IT`, COUNT(*) AS num
FROM replies
GROUP BY `Do you have an interest in Green IT`

然后，此查询返回的每一行都可以作为数据集中的点添加。正如其他人所指出的，您需要先运行查询才能将数据传递给图表类 -

<?php    
/* CAT:Bar Chart */ 

/* pChart library inclusions */ 
include("pchart/class/pData.class.php"); 
include("pchart/class/pDraw.class.php");
include("pchart/class/pImage.class.php"); 

/* Create and populate the pData object */ 
$myData = new pData();   
$myData->setAxisName(0,"Number of Responses"); 
$myData->setSerieDescription("Types of Responses","Types of Responses"); 
$myData->setAbscissa("Types of Responses"); 
$myData->setAbscissaName("Types of Responses"); 

/* Connect to the MySQL database */

$db = mysql_connect("host", "user", "pass");
mysql_select_db("thedatabase",$db);

/* Build the query that will returns the data to graph */

$Requete = "SELECT `Do you have an interest in Green IT` AS resp, COUNT(*) AS num FROM replies GROUP BY resp";

$Result  = mysql_query($Requete,$db);

while($row = mysql_fetch_array($Result))
{
    $myData->addPoints(array($row['resp'], $row['num'])); 
}

我不知道这个特定的图表应用程序是如何工作的，但这应该会给你一些想法。

Answer 2

您试图在从数据库中提取数据之前将数据传递给addPoints方法。看起来你也在使用数据有点奇怪。您正在使用行中的潜在值作为列名。你需要雇用像@nnichols post这样的东西。

你试图传递什么作为addPoints方法中的第二个选项 - 你正在传递数据库资源，但我觉得奇怪的是图表应用程序在需要特定数字时需要它 - 是它是你要通过的总行数？

我还建议重新命名表格中的列，坚持使用has_interest_in_green_it而不是Do you have an interest in Green IT这样的名称。

在使用数据之前，你需要以这种方式使用它：

<?php /* CAT:Bar Chart */ /* pChart library inclusions */ include("pchart/class/pData.class.php"); include("pchart/class/pDraw.class.php"); include("pchart/class/pImage.class.php"); /* Connect to the MySQL database */ $db = mysql_connect("host", "user", "pass"); mysql_select_db("thedatabase",$db); /* Build the query that will returns the data to graph */ $Yes = ""; $No = ""; $Undecided = ""; $Requete = "SELECT `Do you have an interest in Green IT` FROM `replies`"; $Result = mysql_query($Requete,$db); while($row = mysql_fetch_array($Result)) { /* Push the results of the query in an array */ $Yes[] = $row["Yes"]; $No[] = $row["No"]; $Undecided[] = $row["Undecided"]; } /* Create and populate the pData object */ $myData = new pData(); $myData->addPoints(array($Yes,$Result)); $myData->addPoints(array($No,$Result)); $myData->addPoints(array($Undecided,$Result)); $myData->setAxisName(0,"Number of Responses"); $myData->addPoints(array("Yes","No","Undecided"),"Types of Responses"); $myData->setSerieDescription("Types of Responses","Types of Responses"); $myData->setAbscissa("Types of Responses"); $myData->setAbscissaName("Types of Responses"); /* Create the pChart object */ $myPicture = new pImage(500,500,$myData); $myPicture->drawGradientArea(0,0,500,500,DIRECTION_VERTICAL,array("StartR"=>240,"StartG"=>240,"StartB"=>240,"EndR"=>180,"EndG"=>180,"EndB"=>180,"Alpha"=>100)); $myPicture->drawGradientArea(0,0,500,500,DIRECTION_HORIZONTAL,array("StartR"=>240,"StartG"=>240,"StartB"=>240,"EndR"=>180,"EndG"=>180,"EndB"=>180,"Alpha"=>20)); $myPicture->setFontProperties(array("FontName"=>"pchart/fonts/pf_arma_five.ttf","FontSize"=>6)); /* Draw the chart scale */ $myPicture->setGraphArea(100,30,480,480); $myPicture->drawScale(array("CycleBackground"=>TRUE,"DrawSubTicks"=>TRUE,"GridR"=>0,"GridG"=>0,"GridB"=>0,"GridAlpha"=>10,"Pos"=>SCALE_POS_TOPBOTTOM)); /* Turn on shadow computing */ $myPicture->setShadow(TRUE,array("X"=>1,"Y"=>1,"R"=>0,"G"=>0,"B"=>0,"Alpha"=>10)); /* Create the per bar palette */ $Palette = array("0"=>array("R"=>188,"G"=>224,"B"=>46,"Alpha"=>100), "1"=>array("R"=>224,"G"=>100,"B"=>46,"Alpha"=>100), "2"=>array("R"=>224,"G"=>214,"B"=>46,"Alpha"=>100), "3"=>array("R"=>46,"G"=>151,"B"=>224,"Alpha"=>100), "4"=>array("R"=>176,"G"=>46,"B"=>224,"Alpha"=>100), "5"=>array("R"=>224,"G"=>46,"B"=>117,"Alpha"=>100), "6"=>array("R"=>92,"G"=>224,"B"=>46,"Alpha"=>100), "7"=>array("R"=>224,"G"=>176,"B"=>46,"Alpha"=>100)); /* Draw the chart */ $myPicture->drawBarChart(array("DisplayPos"=>LABEL_POS_INSIDE,"DisplayValues"=>TRUE,"Rounded"=>TRUE,"Surrounding"=>30,"OverrideColors"=>$Palette)); /* Write the legend */ $myPicture->drawLegend(570,215,array("Style"=>LEGEND_NOBORDER,"Mode"=>LEGEND_HORIZONTAL)); /* Render the picture (choose the best way) */ $myPicture->autoOutput("pictures/example.drawBarChart.palette.png"); ?>

如何从字段名称和列中检索数据以生成图形

2 个答案: