SQL Server中的XML数据进行insert、update、delete

 

SQL Server 2005/2008增加了对XML数据的支持,同时也新增了几种操作XML的方法,本文主要以SQL Server 2008为例介绍如何对XML数据进行insert、update、delete。       SQL Server中新增加了XML.Modify()方法,分别为xml.modify(insert),xml.modify(delete),xml.modify(replace)对应XML的插入,删除和修改操作。       本文以下面XML为例,对三种DML进行说明:

declare @XMLVar XML; SET @XMLVar= '

<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.Modify(Insert)语句介绍

A.利用as first,at last,before,after四个参数将元素插入指定的位置 set @XMLVar.modify( 'insert <first name="at first" /> as first into (/catalog[1]/book[1])')

set @XMLVar.modify( 'insert <last name="at last"/> as last into (/catalog[1]/book[1])')

set @XMLVar.modify( 'insert <before name="before"/> before (/catalog[1]/book[1]/author[1])')

set @XMLVar.modify( 'insert <after name="after"/> after (/catalog[1]/book[1]/author[1])') SELECT @XMLVar.query('/catalog[1]/book[1]');   结果集为: 1: <book category="ITPro"> 2: <first name="at first" /> 3: <title>Windows Step By Step</title> 4: <before name="before" /> 5: <author>Bill Zack</author> 6: <after name="after" /> 7: <price>49.99</price> 8: <last name="at last" /> 9: </book>

B.将多个元素插入文档中 --方法一:利用变量进行插入 DECLARE @newFeatures xml; SET @newFeatures = N'; <first>one element</first> <second>second element</second>' SET @XMLVar.modify(' ) insert sql:variable("@newFeatures") into (/catalog[1]/book[1])'

--方法二:直接插入 set @XMLVar.modify(') insert (<first>one element</first>,<second>second element</second>) into (/catalog[1]/book[1]/author[1])' SELECT @XMLVar.query('/catalog[1]/book[1]'); 结果集为:   1: <book category="ITPro"> 2:  <title>Windows Step By Step</title> 3:  <author>Bill Zack 4:  <first>one element</first> 5:  <second>second element</second> 6:  </author> 7:  <price>49.99</price> 8:  <first>one element</first> 9:  <second>second element</second> 10: </book>

C.将属性插入文档中 --使用变量插入 declare @var nvarchar(10) = '变量插入' set @XMLVar.modify( 'insert (attribute var {sql:variable("@var")})) into (/catalog[1]/book[1])'

--直接插入 set @XMLVar.modify( 'insert (attribute name {"直接插入"})) into (/catalog[1]/book[1]/title[1])'

--多值插入 set @XMLVar.modify( 'insert (attribute Id {"多值插入1"},attribute name {"多值插入2"}) ) into (/catalog[1]/book[1]/author[1])' SELECT @XMLVar.query('/catalog[1]/book[1]');

结果集为: 1: <book category="ITPro" var="变量插入"> 2: <title name="直接插入">Windows Step By Step</title> 3: <author Id="多值插入1" name="多值插入2">Bill Zack</author> 4: <price>49.99</price> 5: </book>

D.插入文本节点 set @XMLVar.modify( 'insert text{"at first"} as first) into (/catalog[1]/book[1])' SELECT @XMLVar.query('/catalog[1]/book[1]');

结果集为: 1: <book category="ITPro"> 2: at first 3:  <title>Windows Step By Step</title> 4:  <author>Bill Zack</author> 5:  <price>49.99</price> 6: </book> 注意:插入本文同样具体 as first,as last,before,after四种选项,可以参考A中的使用方法

E.插入注释节点 set @XMLVar.modify( N'insert <!--插入评论-->
before (/catalog[1]/book[1]/title[1])' ) SELECT @XMLVar.query('/catalog[1]/book[1]');

结果集为: 1: <book category="ITPro"> 2: <!--插入评论--> 3: <title>Windows Step By Step</title> 4: <author>Bill Zack</author> 5: <price>49.99</price> 6: </book> 注意插入注释节点同样具体 as first,as last,before,after四种选项,可以参考A中的使用方法

F.插入处理指令 set @XMLVar.modify( 'insert <?Program "Instructions.exe" ?> before (/catalog[1]/book[1]/title[1])' ) SELECT @XMLVar.query('/catalog[1]/book[1]');

结果集为: 1: <book category="ITPro"> 2:  <?Program "Instructions.exe" ?> 3:  <title>Windows Step By Step</title> 4:  <author>Bill Zack</author> 5:  <price>49.99</price> 6: </book> 注意插入处理指令同样具体 as first,as last,before,after四种选项,可以参考A中的使用方法

G.根据 if 条件语句进行插入 set @XMLVar.modify( 'insert  if (/catalog[1]/book[1]/title[2]) then text{"this is a 1 step"} else ( text{"this is a 2 step"} ) into (/catalog[1]/book[1]/price[1])' ) SELECT @XMLVar.query('/catalog[1]/book[1]');

结果集为: 1: <book category="ITPro"> 2: <title>Windows Step By Step</title> 3: <author>Bill Zack</author> 4: <price>49.99this is a 2 step</price> 5: </book>

2.XML.Modify(delete)语句介绍 --删除属性 set @XMLVar.modify('delete /catalog[1]/book[1]/@category')

--删除节点 set @XMLVar.modify('delete /catalog[1]/book[1]/title[1]')

--删除内容 set @XMLVar.modify('delete /catalog[1]/book[1]/author[1]/text()')

--全部删除 set @XMLVar.modify('delete /catalog[1]/book[2]')   SELECT @XMLVar.query('/catalog[1]'); 结果集为: 1: <catalog> 2: <book> 3: <author /> 4: <price>49.99</price> 5: </book> 6: <book category="ITPro"> 7: <title>Windows Cluster Server</title> 8: <author>Stephen Forte</author> 9: <price>59.99</price> 10: </book> 11: </catalog>

3.XML.Modify(replace)语句介绍 --替换属性 set @XMLVar.modify(N'replace value of(/catalog[1]/book[1]/@category) with ("替换属性")' ) --替换内容 set @XMLVar.modify(N'replace value of(/catalog[1]/book[1]/author[1]/text()[1]) with("替换内容")' ) --条件替换
set @XMLVar.modify(N'replace value of (/catalog[1]/book[2]/@category) with( if(count(/catalog[1]/book)>4) then "条件替换1" else "条件替换2")' )   SELECT @XMLVar.query('/catalog[1]'); 结果集为: 1: <catalog> 2:  <book category="替换属性"> 3:  <title>Windows Step By Step</title> 4:  <author>替换内容</author> 5:  <price>49.99</price> 6:  </book> 7:  <book category="条件替换2"> 8:  <title>Developing ADO .NET</title> 9:  <author>Andrew Brust</author> 10:  <price>39.93</price> 11:  </book> 12:  <book category="ITPro"> 13:  <title>Windows Cluster Server</title> 14:  <author>Stephen Forte</author> 15:  <price>59.99</price> 16:  </book> 17: </catalog>

posted @ 2011-10-25 22:22  sofootball  阅读(187)  评论(0编辑  收藏  举报