SQL 2005 xml 处理的一些sample

USE Test

--Create 2 tables as an example

CREATE TABLE ExampleTable

(

[ID] int PRIMARY KEY

,[Name] nvarchar(256)

)

CREATE TABLE ExampleTable2

(

[ID] int PRIMARY KEY

,[Name] nvarchar(256)

)

----way1

SELECT *
FROM sys.objects WHERE
[Name] LIKE 'ExampleTable%'
FOR XML AUTO, ROOT('tables')

--way2

SELECT[name] AS [@name], object_id AS [@object_id],
* FROM sys.objects
WHERE [Name] LIKE 'ExampleTable%'
FOR XML PATH('table'), ROOT('tables')

--SELECT * FROM sys.objects WHERE [Name] LIKE 'ExampleTable%'

--Way3

-------------------------------------

--Nested Results using FOR XML PATH--

-------------------------------------

-------------------------------------

--Nested Results using FOR XML PATH--

-------------------------------------

SELECT

t.[name] AS [@name]

,t.object_id AS [@object_id]

,t.[create_date] AS [date/@cdate]

,t.[modify_date] AS [date/mdate]

,CAST('<mydata>some random xml</mydata>' AS xml) [*]

,(
SELECT
c.[name] AS [@name]
,c.[column_id] AS [@column_id]
,c.[is_nullable] AS [@allows_nulls]
,ty.[name] AS [@datatype]
FROM sys.columns c
INNER JOIN sys.types ty ON c.[user_type_id] = ty.[user_type_id]
WHERE t.[object_id] = c.[object_id]
FOR XML PATH('columns'), TYPE

)
FROM sys.objects t
WHERE [Name] LIKE 'ExampleTable%'
FOR XML PATH('table'), ROOT('tables')

SELECT cdate, * FROM syscolumns WHERE id=1077578877

SELECT * FROM sysobjects WHERE id=1077578877

SELECT * FROM sys.objects WHERE object_id=1077578877

--------------------

--Set Xml Variable--

--------------------

/*

In 2000, it wasn't possible to set any variable to the result of a query

*/

DECLARE @xml xml
SELECT @xml =
(
SELECT TOP 3
[Name]
FROM sys.objects
FOR XML AUTO
)
SELECT @xml

/*

The query method allows reformatting of a document into other formats

It could be considered a little like XSLT

*/

DECLARE @doc xml

SET @doc =

'<people>

<person>Martin</person>

<person>Simon</person>

<person>Mark</person>

</people>'

SELECT @doc.query('

for $p in /people/person/text()

return

<root>

<name>

{$p}

</name>

</root>

') AS queryresults

/*

The value method allows a single value to be extracted from an xml document

*/

DECLARE @doc xml, @count int,@name1 nvarchar(20)
DECLARE @maxName AS nvarchar(20)
SET @doc =
'<people>
<person>Martin</person>
<person>Simon</person>
<person>Mark</person>
</people>'
SELECT @count = @doc.value('count(/people/person)', 'int')
SELECT @name1 = @doc.value('(/people/person/text())[2]','nvarchar(20)')
SELECT @count AS [count]
SELECT @name1 AS Name1

----------------------

--Using sql:variable--

----------------------

/*

It is not possible to construct a custom xquery string
However, it is possible to pass in a sql variables as parameters
to the XQuery statement.
NOTE: SQL must be sure that a single value will be returned,
hence the final [1], even though the statement
/people/person[sql:variable("@pos")]/text()

would only ever return 1 value

*/

DECLARE @doc xml, @pos int
SET @doc =
'<people>
<person>Martin</person>
<person>Simon</person>
<person>Mark</person>
</people>'

SELECT @pos = 2
SELECT @doc.value('(/people/person[sql:variable("@pos")]/text())[1]', 'nvarchar(256)')AS SecondName
SELECT @doc.value('(//people/person/text())[2]','nvarchar(20)')

/*
.nodes can be used to shred xml into a table
In 2000 we had to use OPENXML
*/

DECLARE @doc xml
SET @doc =
'<people>
<person>Martin</person>
<person>Simon</person>
<person>Mark</person>
</people>'

SELECT
t.c.query('text()') AS [Name]
FROM
@doc.nodes('people/person') AS t(c);

DECLARE @doc xml
SET @doc =
'<people>
<person id=''1''>
<name>benny</name>
<name>aa</name>
<phone>49313</phone>
<address/>
</person>
<person id=''2''>
<name>skype</name>
<phone>138</phone>
<address>park</address>
</person>
</people>'

SELECT
T.c.value('@id','char(1)') AS Id
,T.c.value('name[2]','nvarchar(20)')
,T.c.value('phone[1]','nvarchar(10)')
FROM @doc.nodes('/people/person') T(c)

WHERE T.c.value('@id','int') = 1

AND T.c.value('phone[1]','nvarchar(10)')='49313'

/*

ID Name phone address
1 benny 19313 ''
2 skype 138 park
*/

SELECT

PeopleTable.PersonColumn.query('/name/text()') AS [Name]

FROM @doc.nodes('/people/person') AS PeopleTable(PersonColumn)

WHERE PeopleTable.PersonColumn.value('@id','int') = 1

--其实XML相对路径的问题，请确认是Namespace不确定还是XML节点路径都不确定(如果是这样，那么设计的XML稳定性有待增强)。

--下面的Demo，是在解析多个Namespace的XML节点，但是路径至少可以确定的：

DECLARE @XML xml

SET @XML=N'

<Publish xmlns="http://soa.newegg.com/SOA/USA/InfrastructureService/V10/PubSubService">

<UserData xmlns="">

<SessionID>0xABde12345</SessionID>

<OrderNumber>1000</OrderNumber>

<Node>

<SessionID>0xABde12345</SessionID>

<OrderNumber>102365</OrderNumber>

</Node>

</UserData>

</Publish>'

--这个是相对路径的解析方式,这种解析方式很容易出现解析到的数据不是我们想要的,比如,我们先想要的Node节点下的SessionID和OrderNumber

--;WITH XMLNAMESPACES (DEFAULT 'http://soa.newegg.com/SOA/USA/InfrastructureService/V10/PubSubService')

SELECT @XML.value('(//SessionID/text())[1]','CHAR(15)')

,@XML.value('(//OrderNumber/text())[1]','int')

--虽然XML的Namespace不确定，但是，我们可以确定XML的路径，这样子避免解析到其他节点的数据。

SELECT @XML.value('(/*:Publish/*:UserData/*:Node/*:SessionID/text())[1]','CHAR(15)')

,@XML.value('(/*:Publish/*:UserData/*:Node/*:OrderNumber/text())[1]','int')

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