sql-server - 使用 SQL 生成 XML 的最佳方式

Question

下面的代码在很多层面上都是错误的，我无法一一列举。 我想任何试图回答这个问题的人都只会使用测试数据表。哈!

我拼凑了几篇文章，在 EXPLICIT、RAW 和 PATH 之间跳来跳去，它变得有点多了。

我认为经常使用 SQL 生成 XML 的人应该很清楚这一点。

我对 Ex、Raw 或 Path 没有偏好 - 我只需要最适合工作的工具。在一天结束时，将有 65 列构成最终文档的各个级别。

我需要代码来查询该表并生成它:

<batchContactList>
    <contact contactID="123" action="AddOrModify">
        <contactField name="FirstName">Johnny</contactField>
        <contactField name="LastName">Testguy</contactField>
        <contactPointList>
            <contactPoint type="Email">
            <contactPointField name="Label">Email</contactPointField>
            <contactPointField name="Address">example@sendwordnow.com</contactPointField>
                </contactPoint>
             </contactPointList>
    </contact>
</batchContactList>

测试代码

--测试数据

DECLARE @tvTest TABLE (contactID INT, FirstName VARCHAR(25), LastName VARCHAR(25), [type] VARCHAR(25), [address] VARCHAR(25))
INSERT INTO @tvTest (contactID, FirstName, LastName, [type], [address])
SELECT 123, 'Johnny', 'Testguy', 'email', 'example@sendwordnow.com'
UNION
SELECT 321, 'Sally', 'Testgirl', 'email', '1example@sendwordnow.com';

--Outer
SELECT
      A.contactID AS "@contactID"
    , 'AddOrModify' AS "@action"
FROM 
    @tvTest A
FOR XML PATH('contact'), ROOT('batchContactList')

--Level 1
DECLARE @xmldata XML;
SELECT @xmldata = (SELECT contactID, FirstName, LastName FROM @tvTest FOR XML PATH (''));

SELECT
      ColumnName AS "@name"
    , ColumnValue AS "text()"
FROM
    (SELECT 
          i.value('local-name(.)','varchar(100)') ColumnName
        , i.value('.','varchar(100)') ColumnValue
    FROM 
        @xmldata.nodes('//*[text()]') x(i)) tmp
FOR XML PATH ('contactField'), ROOT('contact')

SELECT @xmldata = (SELECT contactID, [type], [address] FROM @tvTest FOR XML PATH (''));

--Level 2, not complete
SELECT
      ColumnName AS "@name"
    , ColumnValue AS "text()"
FROM
    (SELECT 
          i.value('local-name(.)','varchar(100)') ColumnName
        , i.value('.','varchar(100)') ColumnValue
    FROM 
        @xmldata.nodes('//*[text()]') x(i)) tmp
FOR XML PATH ('contactPoint'), ROOT('contactPointList')

Answer 1

我总是使用 PATH。

像这样的东西应该给你你想要的。

select T.contactID as [@contactID],
       'AddOrModify' as [@Action],
       'FirstName' as [contactField/@name],
       T.FirstName as [contactField],
       null,
       'LastName' as [contactField/@name],
       T.LastName as [contactField],
       (
       select 'Email' as [contactPoint/@type],
              'Label' as [contactPointField/@name],
              T.type as [contactPointField],
              null,
              'Address' as [contactPointField/@name],
              T.address as [contactPointField]
       for xml path('contactPointList'), type
       )
from @tvTest as T
for xml path('contact'), root('catchContactList')

结果:

<catchContactList>
  <contact contactID="123" Action="AddOrModify">
    <contactField name="FirstName">Johnny</contactField>
    <contactField name="LastName">Testguy</contactField>
    <contactPointList>
      <contactPoint type="Email" />
      <contactPointField name="Label">email</contactPointField>
      <contactPointField name="Address">example@sendwordnow.com</contactPointField>
    </contactPointList>
  </contact>
  <contact contactID="321" Action="AddOrModify">
    <contactField name="FirstName">Sally</contactField>
    <contactField name="LastName">Testgirl</contactField>
    <contactPointList>
      <contactPoint type="Email" />
      <contactPointField name="Label">email</contactPointField>
      <contactPointField name="Address">1example@sendwordnow.com</contactPointField>
    </contactPointList>
  </contact>
</catchContactList>