使用 FOR XML、PATH 嵌套 XML 元素

Question

我有一个 table 事件：

Name    Event       Gift        Label
Jeff    Birthday    Card        Happy Birthday
Jeff    Birthday    Present     Jeff's prezzy
Maisey  Promotion   Cake        Well Done!
Maisey  Birthday    Card        Happy Birthday
Maisey  Birthday    Cake        Another Year Older!

这是生成 table:

的代码

DECLARE @TempTable TABLE
(
    [name] VARCHAR(250),
    [event] VARCHAR(250),
    [gift] VARCHAR(250),
    [label] VARCHAR(2500)
);

INSERT INTO @TempTable([name], [event], [gift], [label]) VALUES
('Jeff','Birthday','Card','Happy Birthday'),
('Jeff','Birthday','Present','Jeff`s prezzy'),
('Maisey','Promotion','Cake','Well Done!'),
('Maisey','Birthday','Card','Happy Birthday'),
('Maisey','Birthday','Cake','Another Year Older!')

我想生成以下 XML 来自：

<celebrations>
    <person name="Jeff">
        <events>
            <event name="Birthday">
                <gifts>
                    <gift name="Card" Value="Happy Birthday" />
                    <gift name="Present" Value="Jeff's prezzy" />
                </gifts>
            </event>
        </events>
    </person>
    <person name="Maisey">
        <events>
            <event name="Promotion">
                <gifts>
                    <gift name="Cake" value="Well Done!" />
                </gifts>
            </event>
            <event name="Birthday">
                <gifts>
                    <gift name="Card" value="Happy Birthday" />
                    <gift name="Cake" value="Another Year Older!" />
                </gifts>
            </event>
        </events>
    </person>
</celebrations>

我当前的 SQLXML 如下所示：

SELECT (
        SELECT (
                SELECT T1.*
                FOR XML path('')
                    ,root('gifts')
                    ,type
                )
        FROM @TempTable AS T1
        FOR XML path('person')
            ,type
        )
FOR XML path('persons')

目前正在生产这个：

<persons>
  <person>
    <gifts>
      <name>Jeff</name>
      <event>Birthday</event>
      <gift>Card</gift>
      <label>Happy Birthday</label>
    </gifts>
  </person>
  <person>
    <gifts>
      <name>Jeff</name>
      <event>Birthday</event>
      <gift>Present</gift>
      <label>Jeff`s prezzy</label>
    </gifts>
  </person>
  <person>
    <gifts>
      <name>Maisey</name>
      <event>Promotion</event>
      <gift>Cake</gift>
      <label>Well Done!</label>
    </gifts>
  </person>
  <person>
    <gifts>
      <name>Maisey</name>
      <event>Birthday</event>
      <gift>Card</gift>
      <label>Happy Birthday</label>
    </gifts>
  </person>
  <person>
    <gifts>
      <name>Maisey</name>
      <event>Birthday</event>
      <gift>Cake</gift>
      <label>Another Year Older!</label>
    </gifts>
  </person>
</persons>

如何将其格式化为看起来像 post 顶部部分中的 XML？

Answer 1

试试这个，神奇的是 相关子查询 与 GROUP BY:

DECLARE @TempTable TABLE
(
    [name] VARCHAR(250),
    [event] VARCHAR(250),
    [gift] VARCHAR(250),
    [label] VARCHAR(2500)
);

INSERT INTO @TempTable([name], [event], [gift], [label]) VALUES
('Jeff','Birthday','Card','Happy Birthday'),
('Jeff','Birthday','Present','Jeff`s prezzy'),
('Maisey','Promotion','Cake','Well Done!'),
('Maisey','Birthday','Card','Happy Birthday'),
('Maisey','Birthday','Cake','Another Year Older!')

SELECT t1.[Name] AS [@name]
      ,(
        SELECT T2.[Event] AS [@name]
              ,(
                SELECT T3.gift AS [@name], T3.label AS [@value]
                FROM @TempTable T3
                WHERE T1.[Name]=T3.[Name] AND T2.[event] = T3.[event]
                GROUP BY T3.gift, T3.label
                FOR XML PATH('gift'),ROOT('gifts'),TYPE
               )
        FROM @TempTable T2
        WHERE T1.[Name]=T2.[Name]
        GROUP BY T2.[event]
        FOR XML PATH('event'),ROOT('events'),TYPE
       ) 
FROM @TempTable AS T1
GROUP BY t1.[Name]
FOR XML PATH('person'),ROOT('celebrations'),TYPE;

结果

<celebrations>
  <person name="Jeff">
    <events>
      <event name="Birthday">
        <gifts>
          <gift name="Card" value="Happy Birthday" />
          <gift name="Present" value="Jeff`s prezzy" />
        </gifts>
      </event>
    </events>
  </person>
  <person name="Maisey">
    <events>
      <event name="Birthday">
        <gifts>
          <gift name="Cake" value="Another Year Older!" />
          <gift name="Card" value="Happy Birthday" />
        </gifts>
      </event>
      <event name="Promotion">
        <gifts>
          <gift name="Cake" value="Well Done!" />
        </gifts>
      </event>
    </events>
  </person>
</celebrations>

使用 FOR XML、PATH 嵌套 XML 元素

Nesting XML elements with FOR XML, PATH

tsql

sql-server

sqlxml