更改while循环的输出样式 - Change output style of while loop

我有一个while循环，从MySQL数据库获取信息，通过php输出信息。我的代码是这样的：

while($row = mysql_fetch_array($result)) {
  $output .= '<tr>' . "'r";
  $output .= '<td>' . $row['lnID'] . '</td>' . "'r";
  $output .= '<td>' . $row['lnLine'] . '</td>' . "'r";
  $output .= '<td>' . $row['lnTitle'] . '</td>' . "'r";
  $output .= '<td>' . $row['cLongName'] . '</td>' . "'r";
  $output .= '</tr>' . "'r";
}

cLongName在数据库中可以有多个条目，因此它以以下形式输出数据：

lnID  | lnLine  | lnTitle  | cLongName
---------------------------------------
lnID1 | lnLine1 | lnTitle1 | cLongname1
lnID1 | lnLine1 | lnTitle1 | cLongname2
lnID1 | lnLine1 | lnTitle1 | cLongname3
lnID2 | lnLine2 | lnTitle2 | cLongname1
lnID2 | lnLine2 | lnTitle2 | cLongname2
lnID2 | lnLine2 | lnTitle2 | cLongname3
lnID2 | lnLine2 | lnTitle2 | cLongname4
lnID2 | lnLine2 | lnTitle2 | cLongname5

我想要这种格式的数据：

lnID  | lnLine  | lnTitle  | cLongName
---------------------------------------------------------------------------------------
lnID1 | lnLine1 | lnTitle1 | cLongname1, cLongname2, cLongname3
lnID2 | lnLine2 | lnTitle2 | cLongname1, cLongname2, cLongname3, cLongname4, cLongname5

我试过在while循环中把foreach循环搞砸，但没有成功。任何想法或帮助都将不胜感激。

--编辑--

我的MySQL查询如下：

$result = mysql_query("
  SELECT
    pcdb_line.lnID, pcdb_line.lnLine, pcdb_line.lnTitle,
    pcdb_colourways.cwLine, pcdb_colourways.cwColID1,
    pcdb_colour_name.cID, pcdb_colour_name.cLongName, pcdb_colour_name.cHex
  FROM pcdb_line
  GROUP BY pcdb_line.lnID
  LEFT JOIN pcdb_colourways
  ON (pcdb_line.lnID = pcdb_colourways.cwLine)
  LEFT JOIN pcdb_colour_name
  ON (pcdb_colour_name.cID = pcdb_colourways.cwColID1)
  LIMIT 50
");

根据ADW的回答，我只在cLongName和所有pcdb_colour_name上尝试了group_concat，但它没有给我任何输出。

--编辑2-

将SELECT查询更改为：

  $result = mysql_query("
    SELECT
      pcdb_line.lnID, pcdb_line.lnLine, pcdb_line.lnTitle,
      pcdb_colourways.cwLine, pcdb_colourways.cwColID1,
      pcdb_colour_name.cID, group_concat(pcdb_colour_name.cLongName) AS cLongNames, pcdb_colour_name.cHex
    FROM pcdb_line
    LEFT JOIN pcdb_colourways
    ON (pcdb_line.lnID = pcdb_colourways.cwLine)
    LEFT JOIN pcdb_colour_name
    ON (pcdb_colour_name.cID = pcdb_colourways.cwColID1)
    GROUP BY pcdb_line.lnID
    LIMIT 50
  ");

允许我在php上使用$output .= "'t't" . '<td>' . $row['cLongNames'] . '</td>' . "'r";，为我提供了所需的输出。

您最好将数据库查询修改为以下内容：

select lnID,lnLine,lnTitle,group_concat(cLongName) from table group by lnID,lnLine,lnTitle;

作为@ADW答案的额外注释，如果您使用整数，您可能需要首先键入强制转换：

select lnID,lnLine,lnTitle,group_concat(CAST(cLongName as CHAR)) as cLongNames from table group by lnID,lnLine,lnTitle;

然后你会用它作为：

$result = mysql_query("
  SELECT
    pcdb_line.lnID, pcdb_line.lnLine, pcdb_line.lnTitle,
    pcdb_colourways.cwLine, pcdb_colourways.cwColID1,
    pcdb_colour_name.cID, group_concat( pcdb_colour_name.cLongName ) as cLongNames, pcdb_colour_name.cHex
  FROM pcdb_line
  GROUP BY pcdb_line.lnID
  LEFT JOIN pcdb_colourways
  ON (pcdb_line.lnID = pcdb_colourways.cwLine)
  LEFT JOIN pcdb_colour_name
  ON (pcdb_colour_name.cID = pcdb_colourways.cwColID1)
  LIMIT 50
");

然后您将以$row['cLongNames'] 的形式访问它