SQL Server解析XML数据的方法分析
2022-11-12 09:41:34
内容摘要
这篇文章主要为大家详细介绍了SQL Server解析XML数据的方法分析,具有一定的参考价值,可以用来参考一下。
对此感兴趣的朋友,看看idc笔记做的技术笔记!
本文实例讲述了SQL Serve
文章正文
这篇文章主要为大家详细介绍了SQL Server解析XML数据的方法分析,具有一定的参考价值,可以用来参考一下。
对此感兴趣的朋友,看看idc笔记做的技术笔记!
本文实例讲述了SQL Server解析XML数据的方法。分享给大家供大家参考,具体如下:
代码如下:
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--下面为多种方法从XML中读取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.多属性过滤 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= "临时工" > <Info NAME= "土豆" SEX= "女" QQ= "5345454554" /> </Employee> <Employee id= "3242" dept= "市场" type= "合同工" > <Info NAME= "choushuigou" SEX= "女" QQ= "54543545" /> </Employee> </Employees>' --查询dept为IT的人员信息 --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 */ --查询出IT部门type为Permanent的员工 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.从XML变量中删除元素 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.读取指定变量元素的值 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使用通配符读取元素值 --读取根元素的值 DECLARE @x1 XML SELECT @x1 = '<People>dongsheng</People>' SELECT @x1.value( '(/*/text())[1]' , 'VARCHAR(20)' ) AS People --星号*代表一个元素 /* People -------------------- dongsheng */ --读取第二层元素的值 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 */ --读取第二个子元素的值 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 */ --读取所有第二层子元素值 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.使用通配符读取元素名称 DECLARE @x XML SELECT @x = '<People>dongsheng</People>' SELECT @x.value( 'local-name(/*[1])' , 'VARCHAR(20)' ) AS ElementName /* ElementName -------------------- People */ --读取根下第一个元素的名称和值 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 */ --读取根下第二个元素的名称和值 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 */ --读取根下所有的元素名称和值 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.查询元素数量 --如下Peoples根节点下有个People子节点。 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根节点下第一个子节点People下子节点的数量 SELECT @x.value( 'count(/Peoples/People[1]/*)' , 'INT' ) AS Children /* Children ----------- 2 */ --某些时候我们可能不知道根节点和子节点的名称,可以用通配符来代替。 SELECT @x.value( 'count(/*/*)' , 'INT' ) AS ChildrenOfRoot, @x.value( 'count(/*/*[1]/*)' , 'INT' ) AS ChildrenOfFirstChildElement /* ChildrenOfRoot ChildrenOfFirstChildElement -------------- --------------------------- 3 2 */ --23.查询属性的数量 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>' --查询跟节点的属性数量 SELECT @x.value( 'count(/Employees/@*)' , 'INT' ) AS AttributeCountOfRoot /* AttributeCountOfRoot -------------------- 1 */ --第一个Employee节点的属性数量 SELECT @x.value( 'count(/Employees/Employee[1]/@*)' , 'INT' ) AS AttributeCountOfFirstElement /* AttributeCountOfFirstElement ---------------------------- 3 */ --第二个Employee节点的属性数量 SELECT @x.value( 'count(/Employees/Employee[2]/@*)' , 'INT' ) AS AttributeCountOfSeconfElement /* AttributeCountOfSeconfElement ----------------------------- 4 */ --如果不清楚节点名称可以用*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 */ --返回没个节点的属性值 SELECT C.value( 'count(./@*)' , 'INT' ) AS AttributeCount FROM @x.nodes( '/*/*' ) T(C) /* AttributeCount -------------- 3 4 */ --24.返回给定位置的属性值或者名称 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>' --返回第一个Employee节点的第一个位置的属性值 SELECT @x.value( '(/Employees/Employee[1]/@*[position()=1])[1]' , 'VARCHAR(20)' ) AS AttValue /* AttValue -------------------- dongsheng */ --返回第二个Employee节点的第四个位置的属性值 SELECT @x.value( '(/Employees/Employee[2]/@*[position()=4])[1]' , 'VARCHAR(20)' ) AS AttValue /* AttValue -------------------- 13954697895 */ --返回第一个元素的第三个属性值 SELECT @x.value( 'local-name((/Employees/Employee[1]/@*[position()=3])[1])' , 'VARCHAR(20)' ) AS AttName /* AttName -------------------- QQ */ --返回第二个元素的第四个属性值 SELECT @x.value( 'local-name((/Employees/Employee[2]/@*[position()=4])[1])' , 'VARCHAR(20)' ) AS AttName /* AttName -------------------- TEL */ --通过变量传递位置返回属性值 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.判断是XML中否存在相应的属性 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 */ --传递变量判断是否存在 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.循环遍历元素的所有属性 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' )--获得属性总数量 -- 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" /> */ --通过变量获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.循环遍历获得所有子元素 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" /> </code> |
SQL Server 中对XML数据的五种基本操作
1.xml.exist 输入为XQuery表达式,返回0,1或是Null。0表示不存在,1表示存在,Null表示输入为空2.xml.value 输入为XQuery表达式,返回一个SQL Server标量值3.xml.query 输入为XQuery表达式,返回一个SQL Server XML类型流4.xml.nodes 输入为XQuery表达式,返回一个XML格式文档的一列行集5.xml.modify
使用XQuery表达式对XML的节点进行insert , update 和 delete 操作。
下面通过例子对上面的五种操作进行说明:
代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | <code> 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>' </code> |
1. xml.exist
代码如下:
1 2 3 4 5 6 7 | <code> 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 </code> |
2.xml.value
代码如下:
1 2 3 4 5 | <code> 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)' ) </code> |
结果集为:Windows Step By StepBill Zack49.99 Developer NULL3.xml.query
代码如下:
1 2 3 4 5 | <code> select @XMLVar.query( '/catalog[1]/book' ) select @XMLVar.query( '/catalog[1]/book[1]' ) select @XMLVar.query( '/catalog[1]/book[2]/author' ) </code> |
结果集分别为:
代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | <code> <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> </code> |
4.xml.nodes
代码如下:
1 2 3 4 | <code> 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) </code> |
结果集分别为:
代码如下:
1 2 3 4 5 6 7 8 | <code> <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> </code> |
代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | <code> 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) --第三层 ) as p /* 1001 Email 1dongsheng@xxyy.com 1001 Phone 678945546 1001 QQ 36575 1001 Addr 36575 */ </code> |
代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | <code> /* 解析XML存储过程 */ 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 </code> |
代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | <code> 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, '/*/*/*' </code> |
希望本文所述对大家SQL Server数据库程序设计有所帮助。
注:关于SQL Server解析XML数据的方法分析的内容就先介绍到这里,更多相关文章的可以留意
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