- Extra information query all nodes in UName value equal to "yellow"
select * from t_UserPayLog where Extra.exist ( ' // UName [. = " Yellow"]') = 1
/ *
SQL xml entry:
- by jinjazz
--http: //blog.csdn.net/jinjazz
1, xml: recognize elements, attributes, and values
2, xpath: addressing language, similar to the windows directory lookup (useless dir command, then went through the wall)
syntax, the syntax can be combined as a condition:
"." said he, ".." means father, "/" means son, "//" represents future generations,
"name" expressed by name Find, "@ name" represented by attribute lookup
"collection [conditions]" represents a subset of taking a set of conditions, the condition may be
values: numeric, last (), last () - digital like
Boolean: position () <digital , @ name = 'condition', name = 'condition'
that may be incorporated when calculating a Boolean value: and or
. 3, XQuery:Xpath query language based on the subject of prospective, sqlserver xquery contains the following functions
exist (xpath condition): returns a Boolean value indicating whether the node exists
query (xpath condition): Returns a new xml document by the qualified nodes of
value (xpath conditions, data type): Returns the specified scalar value, the result must be unique conditions XPath
nodes (xpath Condition): Returns the row by the qualified nodes of a table of results
* /
DECLARE @data XML
SET Data @ = '
<Bookstore>
<Book category = "the COOKING">
<title lang = "EN"> Everyday Italian </ title>
<author> Giada De Laurentiis </ author>
<year> 2005 </ year>
<. price> 30.00 </ . price>
</ Book>
<Book category = "the 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> of 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 = "the WEB">
<title lang = "CN"> Learning XML </ title>
<author> Erik T. Ray </ author>
<year> 2003 </ year>
<. price> 39.95 </. price>
</ Book>
</ child of the bookstore>
'
- test sentence if you do not understand the syntax, please refer to the above rules and xpath xquery function description
the SELECT @ data.exist ( '// Book [@ category = "the WEB"]')
--1, document
the SELECT @data
--2, whether any level present price node
select @ data.exist ( '// price')
--3, acquires all nodes book
SELECT @ data.query ( '// book')
--4, acquires all nodes contain lang attribute
select @ data.query ( '// * [ @ lang]')
--5, obtaining a first book node35] '). Value (' (Book / title) [. 1] ',' VARCHAR (max) ')
--13, equivalent to 12
SELECT @ data.query ( '// book [. 1]')
--6, obtaining the first two nodes book
@ data.query SELECT ( '// book [position () <= 2]')
7 ì, acquires the last book node
SELECT @ data.query ( '// book [Last ()]')
--8, acquisition price> All book node 35
select @ data.query ( '// book [price> 35]')
--9, obtaining category = "WEB" book all nodes
select @ data.query ( '// book [ category = @ "the WEB"] ')
--10, obtaining the title lang = "en" book all nodes
SELECT @ data.query (' // book / title [@ lang = "en"] ')
--11 , obtaining the title lang = "en" and price> All book node 35
SELECT @ data.query ( '// book [./ title [@ lang = "en"] or price> 35]')
--12, Get the title lang = "en" and price> first book (first) of the title 35
select @ data.query ( '// book [ ./ title [@ lang = "en"] and price> 35] ') .value ('(book/title)[1]','varchar(max)')
select @data.value('(//book[./title[@lang="en"] and price>35 ]/title)[1]','varchar(max)')
--14, obtaining the title lang = "en" and price> first book (first) title lang attribute 35
select @ data.value ( '((// book [@ category = "WEB" and price> 35] / title) [. 1] / @ lang) [. 1] ',' VARCHAR (max) ')
--15, acquires the title of the first book
select Tab.Col.value (' (book / title ) [1] ',' varchar (max) ') AS title
from data.nodes @ (' Bookstore ') AS the Tab (CoI)
--16, obtaining a first author of each book
select Tab.Col.value (' author [1] ',' VARCHAR (max) ') AS title
from data.nodes @ (' // book ') AS the Tab (CoI)
--17, access to all information of all book
SELECT
TCvalue (' title [. 1] ',' VARCHAR (max) ') AS title,
the TCvalue('year[1]','int') as year,
T.C.value('title[1]','varchar(max)')as title,
TCvalue ('. price [. 1] ',' a float ') AS. price,
the TCvalue('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、获取不是日语(lang!="jp")且价格大于35的书的所有信息
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)