Select xml 格式的数据使用 FOR XML

Question

我正在以 xml 格式向 select 某些列写入查询。

样本

我有如下数据

Create Table #Master(Id int, Name varchar(100))

Insert Into #Master
Values(1,'Item1'),(2,'Item2')


Create Table #Sub(SubId int,MasteId int, SubName varchar(100))

Insert Into #Sub
Values(1,1,'SubItem1'),(2,1,'SubItem2')

目前正在编写查询如下

Select *
From #Master as Main
FOR XML AUTO, ROOT ('ItemGroup'), ELEMENTS  XSINIL;

如下所示拉取 xml

<ItemGroup xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Main>
    <Id>1</Id>
    <Name>Item1</Name>
  </Main>
  <Main>
    <Id>2</Id>
    <Name>Item2</Name>
  </Main>
</ItemGroup>

但我想使用 link #Master 和 #Sub 为每个主项目在单独的注释中添加子项目，这样它会生成如下所示的内容

<ItemGroup xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <Main>
    <Id>1</Id>
    <Name>Item1</Name>
    <SubItems>
      <subitem>
        <subid>1</subid>
        <masterid>1</masterid>
        <subname>SubItem1</subname>
      </subitem>
      <subitem>
        <subid>2</subid>
        <masterid>1</masterid>
        <subname>SubItem2</subname>
      </subitem>
    </SubItems>
  </Main>
  <Main>
    <Id>2</Id>
    <Name>Item2</Name>
  </Main>
</ItemGroup>

有什么办法可以实现吗？

Answer 1

SELECT
    *,
    (
        SELECT *
        FROM #Sub AS subitem
        WHERE subitem.MasteId = Main.Id
        FOR XML AUTO, ELEMENTS, TYPE 
    ) AS SubItems
From #Master as Main
FOR XML AUTO, ROOT ('ItemGroup'), ELEMENTS XSINIL;

Answer 2

试试这个，

Select *, (Select *
            From #Sub as s
            WHERE s.MasteId = Main.Id
            FOR XML PATH('subitem'), TYPE ) SubItems
From #Master as Main
FOR XML AUTO, ROOT ('ItemGroup'), ELEMENTS  XSINIL;

Select xml 格式的数据使用 FOR XML

Select data in xml format using FOR XML

xml

sql-server

for-xml

sql-server-2012