将Select语句返回为格式化HTML

Question

我有一个看起来像这样的数据集:

   Gender | Age | Name
    Male  | 30  | Bill
  Female  | 27  | Jenny
  Female  | 27  | Debby 
   Male   | 44  | Frank

我试图将其显示为特殊格式的HTML代码:

    <ul>
      <li>Male
        <ul>
          <li>30
            <ul>
              <li>Bill</li>
            </ul>
          </li>
          <li>44
            <ul>
              <li>Frank</li>
            </ul>
          </li>
        </ul>  
      </li>
    </ul>

    <ul>
      <li>Female
        <ul>
          <li>27
            <ul>
              <li>Jenny</li>
              <li>Debby</li>
            </ul>
          </li>
        </ul>  
      </li>
    </ul>

我试过使用,FOR XML但没有给出我想要的结果.它没有删除多个Gender和Age返回的字段.正如您在此HTML中看到的那样,它将所有内容复合在一起,并且只在末端节点上提供重复项.

如何在SQL Server中实现这样的功能？

Answer 1

这是一种手动制定HTML的非常丑陋的方式.有一个很好的理由不属于SQL Server.我肯定会有一些XML专家出现并用一种更简单的方法让我难堪(我使用Simon Sabin的解决方案,但无法将其转换为您的要求),但是现在:

DECLARE @x TABLE(Gender VARCHAR(6), Age INT, Name VARCHAR(32));

INSERT @x VALUES  ('Male',   30, 'Bill'),  ('Female', 27, 'Jenny'),
                  ('Female', 27, 'Debby'), ('Male',   44, 'Frank');

DECLARE @html NVARCHAR(MAX) = N'';

;WITH x AS ( SELECT x.Age, x.Gender, x.Name,
    dr = DENSE_RANK() OVER (PARTITION BY x.Gender ORDER BY x.Age),
    gn = ROW_NUMBER() OVER (PARTITION BY x.Gender ORDER BY x.Age),
    rn = ROW_NUMBER() OVER (ORDER BY x.Gender DESC, x.Age)
  FROM @x AS x ) SELECT @html +=
    CHAR(13) + CHAR(10) + CASE WHEN c1.gn = 1 THEN 
        CASE WHEN c1.rn > 1 THEN '</li></ul></li></ul>' ELSE '' END + '<ul><li>' 
        + c1.Gender ELSE '' END + CHAR(13) + CHAR(10) + CHAR(9) 
        + CASE WHEN c1.gn = 1 OR c1.Age <> c3.Age THEN 
        CASE WHEN c1.gn > 1 THEN '</li>' ELSE '<ul>' END + '<li>' 
        + CONVERT(VARCHAR(32), c1.Age) ELSE '' END + CHAR(13) + CHAR(10) + CHAR(9) 
        + CHAR(9) + CASE WHEN (c1.gn = 1 OR c1.Age <> c3.Age) THEN '<ul>' ELSE '' END 
        + '<li>' + c1.Name + '</li>' + CASE WHEN c1.Age <> c2.Age OR c1.dr <> c2.dr 
        THEN '</ul>' ELSE '' END
FROM x AS c1 
LEFT OUTER JOIN x AS c2
ON c1.rn = c2.rn - 1
LEFT OUTER JOIN x AS c3
ON c1.rn = c3.rn + 1
ORDER BY c1.Gender DESC, c1.Age;

SELECT @html += '</ul></li></ul></li></ul>';

PRINT @html; -- note you will need to deal with this 
             -- in another way if the string is large

结果 - 不完全是您要求的空白区域,而是相同的HTML渲染:

<ul><li>Male
    <ul><li>30
        <ul><li>Bill</li></ul>

    </li><li>44
        <ul><li>Frank</li></ul>
</li></ul></li></ul><ul><li>Female
    <ul><li>27
        <ul><li>Jenny</li>


        <li>Debby</li></ul></li></ul></li></ul>

编辑为了更清晰的解决方案,以及大量的戏剧性和很好的演示,为什么@ZeeTee是StackOverflow上最讨厌的用户,请参阅Mikael对后续问题的解决方案:

将Select语句作为格式化HTML返回(SQL 2005)