TSQL FOR XML 格式化

Question

我有一个 table，我想将其转换为 XML 格式。 table 称为 tempTable 并保存数据：

REF     DESC     QTY
100001  Normal   1
100002  OOH      1

我需要以这种给定的格式创建 XML：

<row>
  <LIN NUM="1">
    <FLD NAME="REF">100001</FLD>
    <FLD NAME="DES">Normal</FLD>
    <FLD NAME="QTY">1</FLD>
  </LIN>
  <LIN NUM="2">
    <FLD NAME="REF">100002</FLD>
    <FLD NAME="DES">OOH</FLD>
    <FLD NAME="QTY">1</FLD>
  </LIN>
</row>

我试过下面的代码：

SET @line = (SELECT '1' AS '@NUM', REF AS 'REF', DES AS 'DES', QTY AS 'QTY' FROM tempTable WHERE ORDER= @ORDER
FOR XML PATH('LIN'))

SELECT @line
FOR XML PATH

但是这会产生：

<row>
  <LIN NUM="1">
    <REF>100001</REF>
    <DES>Normal</DES>
    <QTY>1</QTY>
  </LIN>
  <LIN NUM="1">
    <REF>100002</REF>
    <DES>OOH</DES>
    <QTY>1</QTY>
  </LIN>
</row>

有谁知道我该怎么做:

A) 将 'LIN' 'NUM' 属性更改为根据数量递增该订单的记录？
B) 将 'Name' 属性添加到 'LIN' 详细信息并更改字段名称为 'FLD'。当我尝试将名称更改为 'FLD' 时将值连接到单个节点上，如下所示：
```
<row>
  <LIN NUM="1">
    <FLD>100001Normal1</FLD>
  </LIN>
  <LIN NUM="1">
    <FLD>100002OOH1</FLD>
  </LIN>
</row>
```

我假设我是否可以添加 'NAME' 属性来分隔值？

任何 advice/help 将不胜感激。

谢谢

Answer 1

declare @tempTable table (Ref int, Des varchar(100), Qty int)
insert into @tempTable values (100001, 'Normal', 1), (100002, 'OOH', 1)

SELECT ROW_NUMBER() OVER (ORDER BY Ref) AS '@NUM',
     'REF' AS 'FLD/@NAME', REF AS 'FLD', '',
     'DES' AS 'FLD/@NAME', DES AS 'FLD', '',
     'QTY' AS 'FLD/@NAME', QTY AS 'FLD'

FROM @tempTable 
FOR XML PATH('LIN'), ROOT ('row')

产生：

<row>
  <LIN NUM="1">
    <FLD NAME="REF">100001</FLD>
    <FLD NAME="DES">Normal</FLD>
    <FLD NAME="QTY">1</FLD>
  </LIN>
  <LIN NUM="2">
    <FLD NAME="REF">100002</FLD>
    <FLD NAME="DES">OOH</FLD>
    <FLD NAME="QTY">1</FLD>
  </LIN>
</row>

在的帮助下，因为 select 中的节点和属性之间没有空字符串，SQL 服务器给出错误：

Attribute-centric column 'FLD/@NAME' must not come after a non-attribute-centric sibling in XML hierarchy in FOR XML PATH.

编辑：如评论中所述，解释了空引号技巧为何有效。

总结：

在FOR XML PATH中，没有名称的列成为文本节点
- NULL或''因此成为空文本节点
- 您可以使用 AS *
- 这有助于将先前的输出节点与下一个输出节点分开，以便 SQL 服务器知道例如为下一列开始一个新元素。否则，当属性已经存在于它认为的 "current" 元素

Answer 2

DECLARE @t TABLE (ref varchar(10), descr varchar(10), qty varchar(3))
insert into @t
values('100001', 'Normal', '1'),('10002','OOH','1')

SELECT ROW_NUMBER() OVER (ORDER BY a.ref) AS '@NUM',
(SELECT 'REF' AS 'FLD/@NAME'
 ,ref AS 'FLD'
FROM @t AS FLD
WHERE FLD.ref = a.ref
FOR XML PATH(''), TYPE),
(SELECT 'DESCR' AS 'FLD/@DESCR'
 ,descr AS 'FLD'
FROM @t AS FLD
WHERE FLD.ref = a.ref
FOR XML PATH(''), TYPE),
(SELECT 'QTY' AS 'FLD/@QTY'
 ,QTY AS 'FLD'
FROM @t AS FLD
WHERE FLD.ref = a.ref
FOR XML PATH(''), TYPE)
FROM @t AS a
FOR XML PATH('LIN'), ROOT('row')

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