如何解决TCPDF在mysql
我需要帮助。
我正在尝试从数据库准备pdf，但结果是空白。 pdf是表格格式，具有单独的内联样式。表格设计具有非常复杂的条件，例如根据客户要求根据某些条件进行行和列合并。
这是我在测试中发现的：
- 从数据库中获取少量记录-pdf完美显示
- 从数据库中提取的大量记录-pdf显示为空白（屏幕上没有其他错误，只有纯白色的pdf，并且在编码中设置了页眉和页脚）
- 如果有大量记录，则仅以HTML回显-所有记录均以表格格式完美显示。
我做了什么： 增加了时间限制，执行时间，使用了get_ob_contents和所有ob系列以及我在Google指导下在stackflow中找到的大多数解决方案，但是我没有找到解决方案。
我将所有sql结果存储在一个数组中，因为我必须根据某些字段进行排序，该字段具有来自另一个表的排序顺序（在sql中很多左联接）。而不是添加到左连接，我想到了使用带有选定字段的array_multisort。 pdf是基于sql查询生成的，该sql查询具有多个左连接和以html形式使用设置的where子句。一旦array_multisort仅完成，则将for循环设置为使用writeHTML（）展开变量以供pdf执行
测试示例：
-
sql结果较少（估计：在测试期间为20条记录）的pdf结果可完美生成分页符和页码。
-
带有多条记录（149）pdf的sql结果，出现纯白色单页且仅页眉和页脚
我似乎找不到解决方案以表格式显示大量sql数据的pdf。
是否有更好的方法来实现这一目标？
顺便说一句，我使用的是TCPDF版本6.2.9，这让我头疼不已，所以我下载了6.3.1，结果相同。
<?php
error_reporting(E_ALL);
ini_set('display_errors',"On");
//require_once('tcpdf_include.php');
$original_mem=ini_get('memory_limit');
ini_set('memory_limit','340M');
session_start();
ob_start();
// Include the main TCPDF library (search for installation path).
include '../../dbc.php';
include '../../func.php';
function conditional_format($data){
//function for conditional formatting
//with table row structure
return $formatted_data;
}
require_once('tcpdf_include.php');
// Increase max_execution_time. If a large pdf fails,increase it even more.
ini_set('max_execution_time',180);
// Increase this for old PHP versions (like 5.3.3). If a large pdf fails,increase it even more.
ini_set('pcre.backtrack_limit',1000000);
//below function to set footer align in middl of page
class MYPDF extends TCPDF {
public function Header() {
$curdate=date("d/m/Y");
// get the current page break margin
$bMargin = $this->getBreakMargin();
// get current auto-page-break mode
$auto_page_break = $this->AutoPageBreak;
// disable auto-page-break
$this->SetAutoPageBreak(false,0);
if($this->page==1){
//client requested title only on first page
$this->Cell(0,9,'TRADEMARK STATUS REPORT','B',false,'C','','M','M');
}
$this->SetFont('helvetica',10);
$this->SetAutoPageBreak($auto_page_break,$bMargin);
$this->setPageMark();
}
public function Footer() {
$curdate=date("d/m/Y");
// Position at 10 mm from bottom
$this->SetY(-10);
// Set font
$this->SetFont('helvetica','I',8);
// Page number
$this->Cell(0,10,'as at '.$curdate,'T','L','M');
$this->Cell(0,'Page '.$this->getAliasNumPage(),'R','M');
}
}
//call custom page foooter from function above
$pdf=new MYPDF(PDF_PAGE_ORIENTATION,PDF_UNIT,PDF_PAGE_FORMAT,true,'UTF-8',false);
$pdf->SetCreator(PDF_CREATOR);
$pdf->SetAuthor('Ryan');
$pdf->SetTitle('Trade Mark Status Report');
$pdf->SetSubject('Trade Mark');
$pdf->SetKeywords('Trade Mark,PDF,example,test,guide');
// set header and footer fonts
$pdf->setHeaderFont(Array(PDF_FONT_NAME_MAIN,PDF_FONT_SIZE_MAIN));
$pdf->setFooterFont(Array(PDF_FONT_NAME_DATA,PDF_FONT_SIZE_DATA));
// set default monospaced font
$pdf->SetDefaultMonospacedFont(PDF_FONT_MONOSPACED);
// set margins
$pdf->SetMargins(PDF_MARGIN_LEFT,PDF_MARGIN_TOP,PDF_MARGIN_RIGHT);
$pdf->SetHeaderMargin(PDF_MARGIN_HEADER);
$pdf->SetFooterMargin(PDF_MARGIN_FOOTER);
// set auto page breaks
$pdf->SetAutoPageBreak(TRUE,PDF_MARGIN_BOTTOM);
// set image scale factor
$pdf->setImageScale(PDF_IMAGE_SCALE_RATIO);
// set some language-dependent strings (optional)
if (@file_exists(dirname(__FILE__).'/lang/eng.php')) {
require_once(dirname(__FILE__).'/lang/eng.php');
$pdf->setLanguageArray($l);
}
// ---------------------------------------------------------
// set font
$pdf->SetFont('freeserif',20);
// add a page
$pdf->setHeaderFont(array('',14));
$pdf->AddPage('L','A4');
$pdf->SetFont('freeserif',8);
$main_sql="SELECT ..... WHERE
$user_emtered_where_clause";
//echo $main_sql;
// there is no issue with sql when echo
$result=mysqli_query($db,$main_sql);
$tbl="";
if(!$result){
echo "Error: ".mysqli_error($db);
}else{
if(mysqli_num_rows($result)>0){
while($main_rs=mysqli_fetch_array($result)){
//get record data from DB
// design tbl header with selected record
$tbl = <<<EOF
<table width="950" v-align="top" style="border-collapse: collapse;font-size:13px;table-layout:fixed;" border="0" cellpadding="0" cellspacing="0">
<thead>
<tr>
<td width="950" colspan="7" style="padding:3px;text-align:center;background-color:lightgray;border-bottom:1px solid black;"><h2 style="font-weight:bold;line-height:20px;">$ProjectCompany</h2>
</td>
</tr>
<tr>
<td width="950" colspan="7" style="font-size:17px;font-weight:bold;vertical-align:top;"><br>
$TMClient
</td>
</tr>
<tr>
<td width="30" style="text-align:center;border-left:1px solid black;border-right: 1px solid black;border-bottom: 1px solid black;border-top:1px solid black;background-color: azure;font-weight:bold;">No</td>
<td width="100" style="text-align:center;border-right: 1px solid black;border-bottom: 1px solid black;border-top:1px solid black;background-color: azure;font-weight:bold;">Filing Country</td>
<td width="175" style="text-align:center;border-right: 1px solid black;border-bottom: 1px solid black;border-top:1px solid black;background-color: azure;font-weight:bold;">Applicant/Proprietor</td>
<td width="100" style="text-align:center;border-right: 1px solid black;border-bottom: 1px solid black;border-top:1px solid black;background-color: azure;font-weight:bold;">Trademark No</td>
<td width="205" style="text-align:center;border-right: 1px solid black;border-bottom: 1px solid black;border-top:1px solid black;background-color: azure;font-weight:bold;">Trademark</td>
<td width="80" style="text-align:center;border-right: 1px solid black;border-bottom: 1px solid black;border-top:1px solid black;background-color: azure;font-weight:bold;">Status</td>
<td width="260" style="text-align:center;border-right: 1px solid black;border-bottom: 1px solid black;border-top:1px solid black;background-color: azure;font-weight:bold;">Remarks</td>
</tr>
</thead>
<tbody>
EOF;
//assign data to array
$data_array[]=array(all record data here);// assign to array
}
//sort array
foreach ($data_array as $key => $row){
$sort_country[$key] = $row['sort'];
//to get the sort order value from array
}
// rearrange the array based on the sort order value above
array_multisort($sort_country,SORT_ASC,$data_array);
//view array data
//echo "<pre>";
//print_r($data_array);
//echo "</pre>":
// array data all appear perfect.
if(count($data_array)>0){
$n=1;
// construct table body data
foreach($data_array as $item){
set_time_limit(60);
$no =$n;
//------------------------ construction of table body -----------------------------------
$class_data= conditional_format($classid); // call conditional format function with variable from $data_array
$pbreak=$conditional_page_break;
$tbl_data .= <<<EOD
$pbreak
<tr nobr="true">
<td width="950" padding="0" style="text-align:left;"><table width="950" style="font-size:13px;table-layout:fixed;border:1px solid red;" border="1" cellpadding="2" cellspacing="0">
<tr nobr="true">
<td width="30" height="105" style="text-align:center;vertical-align:top;border-top:1px solid black;border-left:1px solid black;border-right: 1px solid black;">$no</td>
<td width="100" height="105" v-align="top" style="text-align:center;vertical-align:top;border-top:1px solid black;border-right: 1px solid black;border-bottom:1px solid black;">$TMCountry</td>
<td width="175" height="105" v-align="top" style="text-align:left;border-top:1px solid black;border-right: 1px solid black;border-bottom:1px solid black;">$TMEffecOwner</td>
<td width="100" height="105" v-align="top" style="vertical-align:top;border-top:1px solid black;text-align:center;border-right: 1px solid black;border-bottom:1px solid black;">$TMApplnNo</td>
<td width="205" height="105" style="text-align:center;word-wrap: break-word;border-top:1px solid black;border-right: 1px solid black;border-bottom:1px solid black;"><br><br>$logo $imgType</td>
<td width="80" height="105" v-align="top" style="border-top:1px solid black;text-align:center;vertical-align:top;border-right: 1px solid black;border-bottom:1px solid black;">$Status</td>
<td width="260" height="105" v-align="top" style="border-top:1px solid black;vertical-align:top;border-right:1px solid black;border-bottom:1px solid black;">$Remarks</td>
</tr>
</table>
</td>
</tr>
<tr nobr="true">
<td width="950" align="center" style="text-align: center; padding:0px;"><table width="950" v-align="top" style="margin-left: auto;margin-right: auto; font-size:13px;padding:3px;" border="0" cellpadding="0" cellspacing="0" >
<tr>
<td width="30" style="border-left:1px solid black;border-right:1px solid black;"> </td>
<td width="100" style="border-left:1px solid black;font-weight:bold;background-color:#F3F3F3;">Class: </td>
<td width="820" style="border-right:1px solid black;font-weight:bold;background-color:#F3F3F3;">Specification: </td>
</tr>
$class_data
</table>
</td>
</tr>
EOD;
$n++;
$linecount++;
}
}else{
$tbl= "no record";
}
}
$tbl.=$tbl_data."
</tbody>
</table>
";
$tbl_decode=ob_get_contents();
$pdf->SetY(10);
ob_end_clean();
//echo $tbl_decode; //this echo does produce HTML version of entire table
$pdf->writeHTML($tbl_decode,''); // this is where I get blank pdf page
$pdf->Output('Trademark_Status_Report_with_spec.pdf','I');
ini_set('memory_limit',$original_mem);
?>
解决方法
我找到了原因。
首先..其时限问题 所以我将时间限制更改为以下
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
x:Class="hello_world.MainPage">
<StackLayout>
<Label
Text="Welome"
BackgroundColor="Yellow"
TextColor="Green"
HeightRequest="{ConstraintExpression Type=RelativeToView,Factor=0.05,Constant=0}"
FontSize="Medium" />
</StackLayout>
</ContentPage>
第二个问题与sql中的文本字段有关
No property,BindableProperty,or event found for "HeightRequest",or mismatching type between value and property.
现在解决了。
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