php - MYSQL转PDF为空白

Question

  <?php
    require_once("connection.php");
    $result = mysql_query("SELECT * FROM personal_details");
    $header = mysql_query("SELECT `COLUMN_NAME` 
    FROM `INFORMATION_SCHEMA`.`COLUMNS` 
    WHERE `TABLE_SCHEMA`='unania' 
    AND `TABLE_NAME`='personal_details'");

    require('fpdf.php');
    $pdf = new FPDF();
    $pdf->AddPage();
    $pdf->SetFont('Arial','B',12);      
    foreach($header as $heading) {
    foreach($heading as $column_heading)
      $pdf->Cell(90,12,$column_heading,1);
    }
    foreach($result as $row) {
    $pdf->SetFont('Arial','',12);   
    $pdf->Ln();
    foreach($row as $column)
      $pdf->Cell(90,12,$column,1);
    }
    $pdf->Output();
    ?>

上面的代码在运行时输出了一个空白的 PDF 文档，有什么问题吗，是不是我使用的是过程式 mysql 而不是 OOP。但是，我需要尽快找到解决方案。

Answer 1

我花时间用 pdo 为您制作了一个小样本。 不知何故，您的错误没有显示在您的本地主机系统中。你必须分析这个。这是一个对我有用的示例:

<?php
require('fpdf.php');

$db = new PDO('mysql:host=localhost;dbname=test;charset=utf8', 'root', '');
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);

$colNames = array();

foreach($db->query("SELECT * FROM mytest") as $row2) {
    echo $row2['id'].' '.$row2['name'];
}

$result = $db->query("SELECT COLUMN_NAME FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA='test' AND TABLE_NAME='mytest'");

 foreach($result as $row) {
    $colNames[]  = $row["COLUMN_NAME"];
 }

$pdf = new FPDF();
$pdf->AddPage();
$pdf->SetDisplayMode(real,'default');

$pdf->SetFont('Arial','B',12);      
$pdf->SetTextColor(50,60,100);

$pdf->SetXY(50,20);
$pdf->SetDrawColor(50,60,100);
$pdf->Cell(100,10,'Tabledata MyTest',1,0,'C',0);

$pdf->Ln();
$pdf->Ln();

foreach($colNames as $colName) {
    $pdf->Cell(90,12,$colName,1);
}

$pdf->Ln();

foreach($db->query("SELECT * FROM mytest") as $row) {
   $pdf->Ln();
   foreach($colNames as $colName) {
      $pdf->Cell(90,12,$row[$colName],1);
    } 
}

ob_end_clean();
$pdf->Output();

?>