PHPExcel | while 循环内的 while 循环无法正常工作

Question

我有一些 SQL 数据想要使用 PHPExcel 传递给 Excel 文档。

有3张桌子：

1. 书籍：

   1.1 bookID

   1.2 书名

2. 标签：

   2.1 标记ID

   2.2 标记名称

3. Post_Tags：

   3.1 身份证

   3.2 标记ID

   3.3 bookID

我希望标签位于 xls 工作表的第二列，以逗号分隔。所以这里我在一个while循环中有一个while循环。

问题：

在生成的excel表格中，并不是所有书的标签都列在每列B的单元格中，而只有一个标签。

任何想法为什么？在此先感谢:)

require_once "includes/config.php";
require_once "includes/functions.php";
require_once 'phptoxls/PHPExcel.php';

// Create new PHPExcel object
$objPHPExcel = new PHPExcel();
$F = $objPHPExcel -> getActiveSheet();


/*      START: RECORDS      */

$line = 2;
$query = mysql_query('SELECT * FROM `books`') or die(mysql_error());
while($row = mysql_fetch_assoc($query)){

$bookID = $row['bookID'];
$bookName = $row['bookName'];

$query2 = mysql_query('SELECT * FROM `books`
                    INNER JOIN `post_tags`
                    ON post_tags.bookID = books.bookID
                    INNER JOIN `tags`
                    ON tags.tagID = post_tags.tagID
                    WHERE books.bookID = "'.$bookID.'"') or die(mysql_error());

if(mysql_num_rows($query2) > 0){
    $rowNum = mysql_num_rows($query2);
    $i = 1;
    while($row1 = mysql_fetch_assoc($query2)){
        $tags = $row1['tagName'];
        if($i < $rowNum){
            $tags .= ', ';
        }
    }
}

    $F  -> setCellValue('A'.$line, $bookName)
        -> setCellValue('B'.$line, $tags);

    ++$line;
}

/*      END: RECORDS        */


// Redirect output to a client’s web browser (Excel5)
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="books.xls');
header('Cache-Control: max-age=0');

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save('php://output');
exit;

Answer 1

这是你的问题：

while($row1 = mysql_fetch_assoc($query2)){
    $tags = $row1['tagName'];

您在每次循环时都重置 $tags 的值。要使其与您提供的代码一起工作，只需执行以下操作：

if(mysql_num_rows($query2) > 0){
    $rowNum = mysql_num_rows($query2);
    $i = 1;
    $tags = "";
    while($row1 = mysql_fetch_assoc($query2)){
        $tags .= $row1['tagName'];
        if($i < $rowNum){
            $tags .= ', ';
        }
    }
}

不过，我建议您通过以下方式修复它：

if(mysql_num_rows($query2) > 0){
    while($row1 = mysql_fetch_assoc($query2)){
        $tags[] = $row1['tagName'];
    }
    $tags = implode(', ',$tags);
}

Answer 2

首先请更好地缩进你的代码，因为它几乎不可读(http://beta.phpformatter.com)。第二：我认为你只是用'，'-s连接标签。老兄，在你第一次开始时认真的：

<?php
require_once "includes/config.php";
require_once "includes/functions.php";
require_once 'phptoxls/PHPExcel.php';

// Create new PHPExcel object
$objPHPExcel = new PHPExcel();
$F = $objPHPExcel->getActiveSheet();


/*      START: RECORDS      */

$line = 2;
$query = mysql_query('SELECT * FROM `books`') or die(mysql_error());
while ($row = mysql_fetch_assoc($query)) {
    $all_tags_for_one_row = '';
    $bookID = $row['bookID'];
    $bookName = $row['bookName'];

    $query2 = mysql_query('SELECT * FROM `books`
                    INNER JOIN `post_tags`
                    ON post_tags.bookID = books.bookID
                    INNER JOIN `tags`
                    ON tags.tagID = post_tags.tagID
                    WHERE books.bookID = "' . $bookID . '"') or die(mysql_error());

    if (mysql_num_rows($query2) > 0) {
        $rowNum = mysql_num_rows($query2);
        $i = 1;
        while ($row1 = mysql_fetch_assoc($query2)) {
            $tags = $row1['tagName'];
            if ($i < $rowNum) {

                $all_tags_for_one_row .= ($i != $rowNum ? $tags . ', ' : $tags ); 
            }
            $i++;
        }
    }

    $F->setCellValue('A' . $line, $bookName);
    $F->setCellValue('B' . $line, $all_tags_for_one_row);

    ++$line;
}

/*      END: RECORDS        */


// Redirect output to a client’s web browser (Excel5)
header('Content-Type: application/vnd.ms-excel');
header('Content-Disposition: attachment;filename="books.xls');
header('Cache-Control: max-age=0');

$objWriter = PHPExcel_IOFactory::createWriter($objPHPExcel, 'Excel5');
$objWriter->save('php://output');
exit;
?>