本文實(shí)例講述了SQL Server解析XML數(shù)據(jù)的方法。分享給大家供大家參考,具體如下:
--5.讀取XML --下面為多種方法從XML中讀取EMAIL DECLARE @x XML SELECT @x = ' People> dongsheng> Info Name="Email">dongsheng@xxyy.com/Info> Info Name="Phone">678945546/Info> Info Name="qq">36575/Info> /dongsheng> /People>' -- 方法1 SELECT @x.value('data(/People/dongsheng/Info[@Name="Email"])[1]', 'varchar(30)') -- 方法2 SELECT @x.value('(/People/dongsheng/Info[@Name="Email"])[1]', 'varchar(30)') -- 方法3 SELECT C.value('.','varchar(30)') FROM @x.nodes('/People/dongsheng/Info[@Name="Email"]') T(C) -- 方法4 SELECT C.value('(Info[@Name="Email"])[1]','varchar(30)') FROM @x.nodes('/People/dongsheng') T(C) -- 方法5 SELECT C.value('(dongsheng/Info[@Name="Email"])[1]','varchar(30)') FROM @x.nodes('/People') T(C) -- 方法6 SELECT C.value('.','varchar(30)') FROM @x.nodes('/People/dongsheng/Info') T(C) WHERE C.value('(.[@Name="Email"])[1]','varchar(30)') IS NOT NULL -- 方法7 SELECT C.value('.','varchar(30)') FROM @x.nodes('/People/dongsheng/Info') T(C) WHERE C.exist('(.[@Name="Email"])[1]') = 1 --6.Reading values from an XML variable DECLARE @x XML SELECT @x = 'Peoples> People Name="tudou" Sex="女" /> People Name="choushuigou" Sex="女"/> People Name="dongsheng" Sex="男" /> /Peoples>' SELECT v.value('@Name[1]','VARCHAR(20)') AS Name, v.value('@Sex[1]','VARCHAR(20)') AS Sex FROM @x.nodes('/Peoples/People') x(v) --7.多屬性過濾 DECLARE @x XML SELECT @x = ' Employees> Employee id="1234" dept="IT" type="合同工"> Info NAME="dongsheng" SEX="男" QQ="5454545454"/> /Employee> Employee id="5656" dept="IT" type="臨時工"> Info NAME="土豆" SEX="女" QQ="5345454554"/> /Employee> Employee id="3242" dept="市場" type="合同工"> Info NAME="choushuigou" SEX="女" QQ="54543545"/> /Employee> /Employees>' --查詢dept為IT的人員信息 --方法1 SELECT C.value('@NAME[1]','VARCHAR(10)') AS NAME, C.value('@SEX[1]','VARCHAR(10)') AS SEX, C.value('@QQ[1]','VARCHAR(20)') AS QQ FROM @x.nodes('/Employees/Employee[@dept="IT"]/Info') T(C) /* NAME SEX QQ ---------- ---------- -------------------- dongsheng 男 5454545454 土豆 女 5345454554 */ --方法2 SELECT C.value('@NAME[1]','VARCHAR(10)') AS NAME, C.value('@SEX[1]','VARCHAR(10)') AS SEX, C.value('@QQ[1]','VARCHAR(20)') AS QQ FROM @x.nodes('//Employee[@dept="IT"]/*') T(C) /* NAME SEX QQ ---------- ---------- -------------------- dongsheng 男 5454545454 土豆 女 5345454554 */ --查詢出IT部門type為Permanent的員工 SELECT C.value('@NAME[1]','VARCHAR(10)') AS NAME, C.value('@SEX[1]','VARCHAR(10)') AS SEX, C.value('@QQ[1]','VARCHAR(20)') AS QQ FROM @x.nodes('//Employee[@dept="IT"][@type="合同工"]/*') T(C) /* NAME SEX QQ ---------- ---------- -------------------- dongsheng 男 5454545454 */ --12.從XML變量中刪除元素 DECLARE @x XML SELECT @x = ' Peoples> People> NAME>土豆/NAME> SEX>男/SEX> QQ>5345454554/QQ> /People> /Peoples>' SET @x.modify(' delete (/Peoples/People/SEX)[1]' ) SELECT @x /* Peoples> People> NAME>土豆/NAME> QQ>5345454554/QQ> /People> /Peoples> */ --19.讀取指定變量元素的值 DECLARE @x XML SELECT @x = ' Peoples> People> NAME>dongsheng/NAME> SEX>男/SEX> QQ>423545/QQ> /People> People> NAME>土豆/NAME> SEX>男/SEX> QQ>123133/QQ> /People> People> NAME>choushuigou/NAME> SEX>女/SEX> QQ>54543545/QQ> /People> /Peoples> ' DECLARE @ElementName VARCHAR(20) SELECT @ElementName = 'NAME' SELECT c.value('.','VARCHAR(20)') AS NAME FROM @x.nodes('/Peoples/People/*[local-name()=sql:variable("@ElementName")]') T(C) /* NAME -------------------- dongsheng 土豆 choushuigou */ --20使用通配符讀取元素值 --讀取根元素的值 DECLARE @x1 XML SELECT @x1 = 'People>dongsheng/People>' SELECT @x1.value('(/*/text())[1]','VARCHAR(20)') AS People --星號*代表一個元素 /* People -------------------- dongsheng */ --讀取第二層元素的值 DECLARE @x XML SELECT @x = ' People> NAME>dongsheng/NAME> SEX>男/SEX> QQ>423545/QQ> /People>' SELECT @x.value('(/*/*/text())[1]','VARCHAR(20)') AS NAME /* NAME -------------------- dongsheng */ --讀取第二個子元素的值 DECLARE @x XML SELECT @x = ' People> NAME>dongsheng/NAME> SEX>男/SEX> QQ>423545/QQ> /People>' SELECT @x.value('(/*/*/text())[2]','VARCHAR(20)') AS SEX /* SEX -------------------- 男 */ --讀取所有第二層子元素值 DECLARE @x XML SELECT @x = ' People> NAME>dongsheng/NAME> SEX>男/SEX> QQ>423545/QQ> /People>' SELECT C.value('.','VARCHAR(20)') AS value FROM @x.nodes('/*/*') T(C) /* value -------------------- dongsheng 男 423545 */ --21.使用通配符讀取元素名稱 DECLARE @x XML SELECT @x = 'People>dongsheng/People>' SELECT @x.value('local-name(/*[1])','VARCHAR(20)') AS ElementName /* ElementName -------------------- People */ --讀取根下第一個元素的名稱和值 DECLARE @x XML SELECT @x = ' People> NAME>dongsheng/NAME> SEX>男/SEX> /People>' SELECT @x.value('local-name((/*/*)[1])','VARCHAR(20)') AS ElementName, @x.value('(/*/*/text())[1]','VARCHAR(20)') AS ElementValue /* ElementName ElementValue -------------------- -------------------- NAME dongsheng */ --讀取根下第二個元素的名稱和值 DECLARE @x XML SELECT @x = ' People> NAME>dongsheng/NAME> SEX>男/SEX> /People>' SELECT @x.value('local-name((/*/*)[2])','VARCHAR(20)') AS ElementName, @x.value('(/*/*/text())[2]','VARCHAR(20)') AS ElementValue /* ElementName ElementValue -------------------- -------------------- SEX 男 */ --讀取根下所有的元素名稱和值 DECLARE @x XML SELECT @x = ' People> NAME>dongsheng/NAME> SEX>男/SEX> /People>' SELECT C.value('local-name(.)','VARCHAR(20)') AS ElementName, C.value('.','VARCHAR(20)') AS ElementValue FROM @x.nodes('/*/*') T(C) /* ElementName ElementValue -------------------- -------------------- NAME dongsheng SEX 男 */ ---22.查詢元素數(shù)量 --如下Peoples根節(jié)點(diǎn)下有個People子節(jié)點(diǎn)。 DECLARE @x XML SELECT @x = ' Peoples> People> NAME>dongsheng/NAME> SEX>男/SEX> /People> People> NAME>土豆/NAME> SEX>男/SEX> /People> People> NAME>choushuigou/NAME> SEX>女/SEX> /People> /Peoples> ' SELECT @x.value('count(/Peoples/People)','INT') AS Children /* Children ----------- 3 */ --如下Peoples根節(jié)點(diǎn)下第一個子節(jié)點(diǎn)People下子節(jié)點(diǎn)的數(shù)量 SELECT @x.value('count(/Peoples/People[1]/*)','INT') AS Children /* Children ----------- 2 */ --某些時候我們可能不知道根節(jié)點(diǎn)和子節(jié)點(diǎn)的名稱,可以用通配符來代替。 SELECT @x.value('count(/*/*)','INT') AS ChildrenOfRoot, @x.value('count(/*/*[1]/*)','INT') AS ChildrenOfFirstChildElement /* ChildrenOfRoot ChildrenOfFirstChildElement -------------- --------------------------- 3 2 */ --23.查詢屬性的數(shù)量 DECLARE @x XML SELECT @x = ' Employees dept="IT"> Employee NAME="dongsheng" SEX="男" QQ="5454545454"/> Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895"/> /Employees>' --查詢跟節(jié)點(diǎn)的屬性數(shù)量 SELECT @x.value('count(/Employees/@*)','INT') AS AttributeCountOfRoot /* AttributeCountOfRoot -------------------- 1 */ --第一個Employee節(jié)點(diǎn)的屬性數(shù)量 SELECT @x.value('count(/Employees/Employee[1]/@*)','INT') AS AttributeCountOfFirstElement /* AttributeCountOfFirstElement ---------------------------- 3 */ --第二個Employee節(jié)點(diǎn)的屬性數(shù)量 SELECT @x.value('count(/Employees/Employee[2]/@*)','INT') AS AttributeCountOfSeconfElement /* AttributeCountOfSeconfElement ----------------------------- 4 */ --如果不清楚節(jié)點(diǎn)名稱可以用*通配符代替 SELECT @x.value('count(/*/@*)','INT') AS AttributeCountOfRoot ,@x.value('count(/*/*[1]/@*)','INT') AS AttributeCountOfFirstElement ,@x.value('count(/*/*[2]/@*)','INT') AS AttributeCountOfSeconfElement /* AttributeCountOfRoot AttributeCountOfFirstElement AttributeCountOfSeconfElement -------------------- ---------------------------- ----------------------------- 1 3 4 */ --返回沒個節(jié)點(diǎn)的屬性值 SELECT C.value('count(./@*)','INT') AS AttributeCount FROM @x.nodes('/*/*') T(C) /* AttributeCount -------------- 3 4 */ --24.返回給定位置的屬性值或者名稱 DECLARE @x XML SELECT @x = ' Employees dept="IT"> Employee NAME="dongsheng" SEX="男" QQ="5454545454"/> Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895"/> /Employees>' --返回第一個Employee節(jié)點(diǎn)的第一個位置的屬性值 SELECT @x.value('(/Employees/Employee[1]/@*[position()=1])[1]','VARCHAR(20)') AS AttValue /* AttValue -------------------- dongsheng */ --返回第二個Employee節(jié)點(diǎn)的第四個位置的屬性值 SELECT @x.value('(/Employees/Employee[2]/@*[position()=4])[1]','VARCHAR(20)') AS AttValue /* AttValue -------------------- 13954697895 */ --返回第一個元素的第三個屬性值 SELECT @x.value('local-name((/Employees/Employee[1]/@*[position()=3])[1])','VARCHAR(20)') AS AttName /* AttName -------------------- QQ */ --返回第二個元素的第四個屬性值 SELECT @x.value('local-name((/Employees/Employee[2]/@*[position()=4])[1])','VARCHAR(20)') AS AttName /* AttName -------------------- TEL */ --通過變量傳遞位置返回屬性值 DECLARE @Elepos INT,@Attpos INT SELECT @Elepos=2,@Attpos = 3 SELECT @x.value('local-name((/Employees/Employee[sql:variable("@Elepos")]/@*[position()=sql:variable("@Attpos")])[1])','VARCHAR(20)') AS AttName /* AttName -------------------- QQ */ --25.判斷是XML中否存在相應(yīng)的屬性 DECLARE @x XML SELECT @x = 'Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895"/>' IF @x.exist('/Employee/@NAME') = 1 SELECT 'Exists' AS Result ELSE SELECT 'Does not exist' AS Result /* Result ------ Exists */ --傳遞變量判斷是否存在 DECLARE @x XML SELECT @x = 'Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895"/>' DECLARE @att VARCHAR(20) SELECT @att = 'QQ' IF @x.exist('/Employee/@*[local-name()=sql:variable("@att")]') = 1 SELECT 'Exists' AS Result ELSE SELECT 'Does not exist' AS Result /* Result ------ Exists */ --26.循環(huán)遍歷元素的所有屬性 DECLARE @x XML SELECT @x = 'Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895"/>' DECLARE @cnt INT, @totCnt INT, @attName VARCHAR(30), @attValue VARCHAR(30) SELECT @cnt = 1, @totCnt = @x.value('count(/Employee/@*)','INT')--獲得屬性總數(shù)量 -- loop WHILE @cnt = @totCnt BEGIN SELECT @attName = @x.value( 'local-name((/Employee/@*[position()=sql:variable("@cnt")])[1])', 'VARCHAR(30)'), @attValue = @x.value( '(/Employee/@*[position()=sql:variable("@cnt")])[1]', 'VARCHAR(30)') PRINT 'Attribute Position: ' + CAST(@cnt AS VARCHAR) PRINT 'Attribute Name: ' + @attName PRINT 'Attribute Value: ' + @attValue PRINT '' -- increment the counter variable SELECT @cnt = @cnt + 1 END /* Attribute Position: 1 Attribute Name: NAME Attribute Value: 土豆 Attribute Position: 2 Attribute Name: SEX Attribute Value: 女 Attribute Position: 3 Attribute Name: QQ Attribute Value: 5345454554 Attribute Position: 4 Attribute Name: TEL Attribute Value: 13954697895 */ --27.返回指定位置的子元素 DECLARE @x XML SELECT @x = ' Employees dept="IT"> Employee NAME="dongsheng" SEX="男" QQ="5454545454"/> Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895"/> /Employees>' SELECT @x.query('(/Employees/Employee)[1]') /* Employee NAME="dongsheng" SEX="男" QQ="5454545454" /> */ SELECT @x.query('(/Employees/Employee)[position()=2]') /* Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895" /> */ --通過變量獲取指定位置的子元素 DECLARE @i INT SELECT @i = 2 SELECT @x.query('(/Employees/Employee)[sql:variable("@i")]') --or SELECT @x.query('(/Employees/Employee)[position()=sql:variable("@i")]') /* Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895" /> */ --28.循環(huán)遍歷獲得所有子元素 DECLARE @x XML SELECT @x = ' Employees dept="IT"> Employee NAME="dongsheng" SEX="男" QQ="5454545454"/> Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895"/> /Employees>' DECLARE @cnt INT, @totCnt INT, @child XML -- counter variables SELECT @cnt = 1, @totCnt = @x.value('count(/Employees/Employee)','INT') -- loop WHILE @cnt = @totCnt BEGIN SELECT @child = @x.query('/Employees/Employee[position()=sql:variable("@cnt")]') PRINT 'Processing Child Element: ' + CAST(@cnt AS VARCHAR) PRINT 'Child element: ' + CAST(@child AS VARCHAR(100)) PRINT '' -- incremet the counter variable SELECT @cnt = @cnt + 1 END /* Processing Child Element: 1 Child element: Employee NAME="dongsheng" SEX="男" QQ="5454545454"/> Processing Child Element: 2 Child element: Employee NAME="土豆" SEX="女" QQ="5345454554" TEL="13954697895"/>
SQL Server 中對XML數(shù)據(jù)的五種基本操作
1.xml.exist
輸入為XQuery表達(dá)式,返回0,1或是Null。0表示不存在,1表示存在,Null表示輸入為空
2.xml.value
輸入為XQuery表達(dá)式,返回一個SQL Server標(biāo)量值
3.xml.query
輸入為XQuery表達(dá)式,返回一個SQL Server XML類型流
4.xml.nodes
輸入為XQuery表達(dá)式,返回一個XML格式文檔的一列行集
5.xml.modify
使用XQuery表達(dá)式對XML的節(jié)點(diǎn)進(jìn)行insert , update 和 delete 操作。
下面通過例子對上面的五種操作進(jìn)行說明:
declare @XMLVar xml = ' catalog> book category="ITPro"> title>Windows Step By Step/title> author>Bill Zack/author> price>49.99/price> /book> book category="Developer"> title>Developing ADO .NET/title> author>Andrew Brust/author> price>39.93/price> /book> book category="ITPro"> title>Windows Cluster Server/title> author>Stephen Forte/author> price>59.99/price> /book> /catalog>'
1. xml.exist
select @XMLVar.exist('/catalog/book')-----返回1 select @XMLVar.exist('/catalog/book/@category')-----返回1 select @XMLVar.exist('/catalog/book1')-----返回0 set @XMLVar = null select @XMLVar.exist('/catalog/book')-----返回null
2.xml.value
select @XMLVar.value('/catalog[1]/book[1]','varchar(MAX)') select @XMLVar.value('/catalog[1]/book[2]/@category','varchar(MAX)') select @XMLVar.value('/catalog[2]/book[1]','varchar(MAX)')
結(jié)果集為:
Windows Step By StepBill Zack49.99 Developer NULL
3.xml.query
select @XMLVar.query('/catalog[1]/book') select @XMLVar.query('/catalog[1]/book[1]') select @XMLVar.query('/catalog[1]/book[2]/author')
結(jié)果集分別為:
book category="ITPro"> title>Windows Step By Step/title> author>Bill Zack/author> price>49.99/price> /book> book category="Developer"> title>Developing ADO .NET/title> author>Andrew Brust/author> price>39.93/price> /book> book category="ITPro"> title>Windows Cluster Server/title> author>Stephen Forte/author> price>59.99/price> /book> book category="ITPro"> title>Windows Step By Step/title> author>Bill Zack/author> price>49.99/price> /book> author>Andrew Brust/author>
4.xml.nodes
select T.c.query('.') as result from @XMLVar.nodes('/catalog/book') as T(c) select T.c.query('title') as result from @XMLVar.nodes('/catalog/book') as T(c)
結(jié)果集分別為:
book category="ITPro">title>Windows Step By Step/title>author>Bill ………… book category="Developer">title>Developing ADO .NET/title>author>Andrew ………… book category="ITPro">title>Windows Cluster Server/title>author>Stephen ………… title>Windows Step By Step/title> title>Developing ADO .NET/title> title>Windows Cluster Server/title>
set ARITHABORT on DECLARE @x XML SELECT @x = 'Peoples> People> Email>1dongsheng@xxyy.com/Email> Phone>678945546/Phone> QQ>36575/QQ> Addr>36575/Addr> /People> /Peoples>' -- 方法1 select 1001 as peopleId, p.* FROM( SELECT C.value('local-name(.)','VARCHAR(20)') AS attrName, C.value('.','VARCHAR(20)') AS attrValue FROM @x.nodes('/*/*/*') T(C) --第三層 ) as p /* 1001 Email 1dongsheng@xxyy.com 1001 Phone 678945546 1001 QQ 36575 1001 Addr 36575 */
/* 解析XML存儲過程 */ ALTER PROCEDURE [dbo].[sp_ExportXml] @x xml , @layerstr nvarchar(max) AS DECLARE @sql nvarchar(max) BEGIN set arithabort on set @sql='select p.* FROM( SELECT C.value(''local-name(.)'',''VARCHAR(20)'') AS attrName, C.value(''.'',''VARCHAR(20)'') AS attrValue FROM @xmlParas.nodes('''+@layerstr+''') T(C) ) as p' --print @sql EXECUTE sp_executesql @sql, N'@xmlParas as xml',@xmlParas=@x END
DECLARE @x XML SELECT @x = 'Peoples> People> Email>1dongsheng@xxyy.com/Email> Phone>678945546/Phone> QQ>36575/QQ> Addr>36575/Addr> /People> /Peoples>' EXECUTE sp_ExportXml @x,'/*/*/*'
希望本文所述對大家SQL Server數(shù)據(jù)庫程序設(shè)計有所幫助。
標(biāo)簽:東營 大同 黃山 池州 文山 濱州 來賓 新鄉(xiāng)
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