Question

我安装了SQL Server 2012。有一个名为InnerTransId cText cVal --------------- ----------- ------------------- 89274503 Idea Date: 2017-03-22 89274503 Idea Name: The Invisible Cloak的表在表中有多个记录。

u = User.first # name = bar
User.first.update(name: "foo")
u.name # => 'bar'
u2 = User.find(u.id)
u.name == u2.name # => false

从channel_group列的每条记录中，我需要获取数据库中每条记录的每个通道标记的id标记中的所有值。

解析这个或我可以运行的查询的最佳方法是动态的吗？

[dbo].[CHANNEL_GROUP]
(
    [ID] [nvarchar](255) NOT NULL,
    [NAME] [nvarchar](255) NOT NULL,
    [REVISION] [int] NULL,
    [CHANNEL_GROUP] [nvarchar](max) NULL
)

Answer 1

Declare @YourTable table (ID int,CHANNEL_GROUP varchar(max))
Insert Into @YourTable values
(1,'<channelGroup version="3.4.2"><id>990b417d-27ae-4928-b4cc-cc010665615e</id><name>Production</name><revision>3</revision><lastModified><time>1490385251147</time><timezone>America/New_York</timezone></lastModified><description></description><channels><channel version="3.4.2"><id>321439ff-46d6-4c3d-b1cd-ebc48d3c7fd2</id><enabled>false</enabled><revision>0</revision></channel><channel version="3.4.2"><id>c2d06aee-3031-4c6a-a3c1-23f7e96c971c</id><enabled>false</enabled><revision>0</revision></channel></channels></channelGroup>'),
(2,'<channelGroup version="3.9.9"><id>990b417d-27ae-4928-b4cc-cc010665615e</id><name>Production</name><revision>3</revision><lastModified><time>1490385251147</time><timezone>America/New_York</timezone></lastModified><description></description><channels><channel version="3.4.2"><id>SomeOtherID</id><enabled>false</enabled><revision>0</revision></channel><channel version="3.4.2"><id>AnotherID</id><enabled>false</enabled><revision>0</revision></channel></channels></channelGroup>')

Select A.ID
      ,Channel_ID= C.ID
 From  @YourTable A
 Cross Apply (Select XMLData=cast(A.CHANNEL_GROUP as xml)) B
 Cross Apply (
                Select [id]       = f.n.value('(id)[1]','varchar(50)') 
                 From  B.XMLData.nodes('channelGroup/channels') t(n)
                 Cross Apply t.n.nodes('channel') f(n)
             ) C

<强>返回

ID  Channel_ID
1   321439ff-46d6-4c3d-b1cd-ebc48d3c7fd2
1   c2d06aee-3031-4c6a-a3c1-23f7e96c971c
2   SomeOtherID
2   AnotherID

如何从SQL Server列解析xml

1 个答案: