如何将XML数据转换为SQL Server表

我有这样的XML数据：

---

下面是我是如何做到这一点的，尽管有几种方法

WITH xmlData AS (
SELECT CAST('<root>
 <log realm="ABC" at="Wed Oct 15 00:00:02 2014.211" lifespan="2279ms">
  <receive>
    <isomsg direction="IN">
      <header>6000911384</header>
      <field id="0" value="0800"/>
      <field id="3" value="980000"/>
      <field id="11" value="000852"/>
    </isomsg>
  </receive>
</log>
</root>' AS XML) as xmlData)
SELECT xmlData, logs.x.value('(@at)[1]','varchar(50)') as 'Element1', logs.x.value('(@lifespan)[1]','varchar(50)') as 'Element2', ismsgs.logs.value('(@direction)[1]','varchar(50)') as 'Element3', fields.ismsgs.value('(@value)[1]','varchar(50)') as 'Element4'
FROM xmlData x
CROSS APPLY xmlData.nodes('root/log') logs(x)   
CROSS APPLY xmlData.nodes('root/log/receive/isomsg') ismsgs(logs)
CROSS APPLY xmlData.nodes('root/log/receive/isomsg/field') fields(ismsgs)

---

这将比@Nick的答案简单得多，因为它只需要一个。节点调用，而不是三个嵌套的节点调用

DECLARE @input XML = '<root>
 <log realm="ABC" at="Wed Oct 15 00:00:02 2014.211" lifespan="2279ms">
  <receive>
    <isomsg direction="IN">
      <header>6000911384</header>
      <field id="0" value="0800"/>
      <field id="3" value="980000"/>
      <field id="11" value="000852"/>
    </isomsg>
  </receive>
</log>
</root>'

SELECT
    At = xc.value('../../../@at', 'varchar(50)'),
    Lifespan = xc.value('../../../@lifespan', 'varchar(25)'),
    Direction = xc.value('../@direction', 'varchar(10)'),
    ID = XC.value('@id', 'int'),
    Value = xc.value('@value', 'varchar(25)')
FROM
    @Input.nodes('/root/log/receive/isomsg/field') AS XT(XC)

---

对@Input.nodes的调用基本上返回一个XML片段的虚拟表，表示每个XML元素。通过使用。。我们还可以在原始文档中向上导航XML层次结构，以访问和元素并从中获取属性值

检查此项您还可以查看创建xslt以将数据转换为SQL脚本！！比我的干净多了。我假设这在从一个表中选择数据时起作用，而不是从一个包含XML数据的变量中选择数据？我之所以问这个问题，是因为我本来有一些类似的东西，但很难让它发挥作用。我通过/root/log从顶层启动了节点，这可能就是问题所在。这很简单。非常感谢marc_s非常感谢Nick

WITH xmlData AS (
SELECT CAST('<root>
 <log realm="ABC" at="Wed Oct 15 00:00:02 2014.211" lifespan="2279ms">
  <receive>
    <isomsg direction="IN">
      <header>6000911384</header>
      <field id="0" value="0800"/>
      <field id="3" value="980000"/>
      <field id="11" value="000852"/>
    </isomsg>
  </receive>
</log>
</root>' AS XML) as xmlData)
SELECT xmlData, logs.x.value('(@at)[1]','varchar(50)') as 'Element1', logs.x.value('(@lifespan)[1]','varchar(50)') as 'Element2', ismsgs.logs.value('(@direction)[1]','varchar(50)') as 'Element3', fields.ismsgs.value('(@value)[1]','varchar(50)') as 'Element4'
FROM xmlData x
CROSS APPLY xmlData.nodes('root/log') logs(x)   
CROSS APPLY xmlData.nodes('root/log/receive/isomsg') ismsgs(logs)
CROSS APPLY xmlData.nodes('root/log/receive/isomsg/field') fields(ismsgs)

DECLARE @input XML = '<root>
 <log realm="ABC" at="Wed Oct 15 00:00:02 2014.211" lifespan="2279ms">
  <receive>
    <isomsg direction="IN">
      <header>6000911384</header>
      <field id="0" value="0800"/>
      <field id="3" value="980000"/>
      <field id="11" value="000852"/>
    </isomsg>
  </receive>
</log>
</root>'

SELECT
    At = xc.value('../../../@at', 'varchar(50)'),
    Lifespan = xc.value('../../../@lifespan', 'varchar(25)'),
    Direction = xc.value('../@direction', 'varchar(10)'),
    ID = XC.value('@id', 'int'),
    Value = xc.value('@value', 'varchar(25)')
FROM
    @Input.nodes('/root/log/receive/isomsg/field') AS XT(XC)