SQL XML process

declare @data xml

set @data='

<bookstore>

<book category="COOKING">

  <title lang="en">Everyday Italian</title>

  <author>Giada De Laurentiis</author>

  <year>2005</year>

  <price>30.00</price>

</book>

<book category="CHILDREN">

  <title lang="jp">Harry Potter</title>

  <author>J K. Rowling</author>

  <year>2005</year>

  <price>29.99</price>

</book>

<book category="WEB">

  <title lang="en">XQuery Kick Start</title>

  <author>James McGovern</author>

  <author>Per Bothner</author>

  <author>Kurt Cagle</author>

  <author>James Linn</author>

  <author>Vaidyanathan Nagarajan</author>

  <year>2003</year>

  <price>49.99</price>

</book>

<book category="WEB">

  <title lang="cn">Learning XML</title>

  <author>Erik T. Ray</author>

  <year>2003</year>

  <price>39.95</price>

</book>

</bookstore>

'



--1、  

select @data

--2、        price  

select @data.exist('//price')

--3、    book  

select @data.query('//book')

--4、      lang     

select @data.query('//*[@lang]') 

--5、     book  

select @data.query('//book[1]')

--6、     book  

select @data.query('//book[position()<=2]')

--7、      book  

select @data.query('//book[last()]')

--8、  price>35   book  

select @data.query('//book[price>35]')

--9、  category="WEB"   book  

select @data.query('//book[@category="WEB"]')

--10、  title lang="en"   book  

select @data.query('//book/title[@lang="en"]')

--11、  title lang="en"  price>35   book  

select @data.query('//book[./title[@lang="en"] or price>35 ]')

--12、  title lang="en"  price>35   book (   )title

select @data.query('//book[./title[@lang="en"] and price>35 ]').value('(book/title)[1]','varchar(max)')

--13、   12

select @data.value('(//book[./title[@lang="en"] and price>35 ]/title)[1]','varchar(max)')

--14、  title lang="en"  price>35   book (   )title lang  

select @data.value('((//book[@category="WEB" and price>35 ]/title)[1]/@lang)[1]','varchar(max)')

--15、       title

select Tab.Col.value('(book/title)[1]','varchar(max)') as title

    from @data.nodes('bookstore')as Tab(Col) 

--16、         author

select Tab.Col.value('author[1]','varchar(max)') as title

    from @data.nodes('//book')as Tab(Col)

--17、    book     

select

 T.C.value('title[1]','varchar(max)') as title,

 T.C.value('year[1]','int') as year,

 T.C.value('title[1]','varchar(max)')as title,

 T.C.value('price[1]','float') as price,

 T.C.value('author[1]','varchar(max)') as author1,

 T.C.value('author[2]','varchar(max)') as author2,

 T.C.value('author[3]','varchar(max)') as author3,

 T.C.value('author[4]','varchar(max)') as author4

from @data.nodes('//book') as T(C)

--18、      (lang!="jp")     35       

select

 T.C.value('title[1]','varchar(max)') as title,

 T.C.value('year[1]','int') as year,

 T.C.value('title[1]','varchar(max)')as title,

 T.C.value('price[1]','float') as price,

 T.C.value('author[1]','varchar(max)') as author1,

 T.C.value('author[2]','varchar(max)') as author2,

 T.C.value('author[3]','varchar(max)') as author3,

 T.C.value('author[4]','varchar(max)') as author4

from @data.nodes('//book[./title[@lang!="jp"] and price>35 ]') as T(C)