从varchar(max)列中选择XML

Question

我有一些XML数据存储在SQL Server 2005上的varchar(max)列中.数据的格式为(FQTN =完全限定类型名称):

<?xml version="1.0" encoding="utf-16"?>
<History xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <EntityViews>
    <EntityProxy Type="FQTN" Key="386876" />
    <EntityProxy Type="FQTN" Key="387981" />
    <!-- etc. -->
  </EntityViews>
</History>

如何选择Type,Key以便从此列的XML数据中获取单行的表格结果？该表具有名为HistoryId的标识主键.

Answer 1

;with cteCastToXML as (
    select CAST(YourColumn as xml) as x
        from YourTable
)
select h.ep.value('@Type','varchar(10)') as [Type],
       h.ep.value('@Key', 'varchar(10)') as [Key]
    from cteCastToXML
        cross apply x.nodes('/History/EntityViews/EntityProxy') as h(ep)