Question

我正在尝试以XML格式从（SQL Server 2008 R2）表中检索数据，但似乎无法将其转换为理想的结构。我尝试了各种FOR XML模式和连接方法，但是我对XML的经验很少，并且在此之前没有通过SQL使用XML输出。

我的数据位于名为XMLResults的表中，其结构如下：

ResultID    Country Product Disposition Results
-----------------------------------------------
1           UK      ABC     Result1     100
2           UK      ABC     Result2     200
3           UK      ABC     Result3     300
4           UK      XYZ     Result1     100
5           UK      XYZ     Result2     200
6           UK      XYZ     Result3     300
7           USA     ABC     Result1     100
8           USA     ABC     Result2     200
9           USA     ABC     Result3     300
10          USA     XYZ     Result1     100
11          USA     XYZ     Result2     200
12          USA     XYZ     Result3     300

目前我有这个问题：

SELECT (SELECT Country,
                (SELECT Product,
                        (SELECT Disposition, Results
                           FROM XMLResults t1
                          WHERE t1.ResultID = t2.ResultID
                            FOR XML PATH ('Dispositions'), TYPE, ELEMENTS
                        )
                   FROM XMLResults t2
                  WHERE t2.ResultID = t3.ResultID
                    FOR XML PATH ('Products'), TYPE, ELEMENTS
                )
          FROM XMLResults t3
         ORDER BY Country, Product
           FOR XML PATH ('Countries'), TYPE, ELEMENTS
        )
   FOR XML PATH('Stats');

返回XML如下：

<Stats>
  <Countries>
    <Country>UK</Country>
    <Products>
      <Product>ABC</Product>
      <Dispositions>
        <Disposition>Result1</Disposition>
        <Results>100</Results>
      </Dispositions>
    </Products>
  </Countries>
  <Countries>
    <Country>UK</Country>
    <Products>
      <Product>ABC</Product>
      <Dispositions>
        <Disposition>Result2</Disposition>
        <Results>200</Results>
      </Dispositions>
    </Products>
  </Countries>
  <Countries>
    <Country>UK</Country>
    <Products>
      <Product>ABC</Product>
      <Dispositions>
        <Disposition>Result3</Disposition>
        <Results>300</Results>
      </Dispositions>
    </Products>
  </Countries>
  ...
</Stats>

并不可怕，但我希望它不会在每次结果后一直退回到“国家”级别，也可能不需要额外的通用标签。

这样的事情会更好：

<Stats>
  <Countries>
    <Country = "UK">
      <Products>
        <Product = "ABC">
          <Dispositions>
            <Disposition>
              <ReasonCode>Result1</ReasonCode>
              <Count>100</Count>
            </Disposition>
            <Disposition>
              <ReasonCode>Result2</ReasonCode>
              <Count>200</Count>
            </Disposition>
            <Disposition>
              <ReasonCode>Result3</ReasonCode>
              <Count>300</Count>
            </Disposition>
          </Dispositions>
        </Product>
        ...
      </Products>
    </Country>
    ...
  </Countries>
</Stats>

甚至可能是这样的东西（看起来有点干净）：

<Stats>
  <Country = "UK">
    <Product = "ABC">
      <Disposition ReasonCode = "Result1" Count = "100" />
      <Disposition ReasonCode = "Result2" Count = "200" />
      <Disposition ReasonCode = "Result3" Count = "300" />
    </Product>
    <Product = "XYZ">
      <Disposition ReasonCode = "Result1" Count = "100" />
      <Disposition ReasonCode = "Result2" Count = "200" />
      <Disposition ReasonCode = "Result3" Count = "300" />
    </Product>
  </Country>
  <Country = "USA">
    <Product = "ABC">
      <Disposition ReasonCode = "Result1" Count = "100" />
      <Disposition ReasonCode = "Result2" Count = "200" />
      <Disposition ReasonCode = "Result3" Count = "300" />
    </Product>
    <Product = "XYZ">
      <Disposition ReasonCode = "Result1" Count = "100" />
      <Disposition ReasonCode = "Result2" Count = "200" />
      <Disposition ReasonCode = "Result3" Count = "300" />
    </Product>
  </Country>
</Stats>

输出格式不是一成不变的，所以如果有建议，我也会对此提出建议。

谢谢，肖恩

编辑样本数据：

CREATE TABLE XMLResults (
      ResultID BIGINT IDENTITY(1,1) NOT NULL
    , Country VARCHAR(50) NOT NULL
    , Product VARCHAR(50) NOT NULL
    , Disposition VARCHAR(50) NOT NULL
    , Results INT NOT NULL);

INSERT INTO XMLResults (Country, Product, Disposition, Results)
VALUES ('UK',  'ABC', 'Result1', 100)
     , ('UK',  'ABC', 'Result2', 200)
     , ('UK',  'ABC', 'Result3', 300)
     , ('UK',  'XYZ', 'Result1', 100)
     , ('UK',  'XYZ', 'Result2', 200)
     , ('UK',  'XYZ', 'Result3', 300)
     , ('USA', 'ABC', 'Result1', 100)
     , ('USA', 'ABC', 'Result2', 200)
     , ('USA', 'ABC', 'Result3', 300)
     , ('USA', 'XYZ', 'Result1', 100)
     , ('USA', 'XYZ', 'Result2', 200)
     , ('USA', 'XYZ', 'Result3', 300);

Answer 1

如果您想要以属性为中心的xml，请在列别名前添加“@”。您可以完全自定义输出，例如：

SELECT
  Country [@Country],
  (SELECT
    Product [@Product],
    (SELECT
      Disposition [@ReasonCode],
      Results [@Count]
    FROM #XMLResults t3
    WHERE t3.Country = t1.Country AND t3.Product = t2.Product
    FOR XML PATH('Disposition'),TYPE)
  FROM #XMLResults  t2
  WHERE t2.Country = t1.Country
  GROUP BY Product
  FOR XML PATH('Product'),TYPE)
FROM #XMLResults  t1
GROUP BY Country
FOR XML PATH('Country'), ROOT ('Stats')

只是玩弄它。

如何在SQL中控制XML的输出格式

1 个答案: