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：
复制代码 代码如下:
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
复制代码 代码如下:
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：
复制代码 代码如下:
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
复制代码 代码如下:
--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：
复制代码 代码如下:
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
复制代码 代码如下:
--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：
复制代码 代码如下:
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
复制代码 代码如下:
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：
复制代码 代码如下:
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
复制代码 代码如下:
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
复制代码 代码如下:
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
复制代码 代码如下:
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
复制代码 代码如下:
--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：
复制代码 代码如下:
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
复制代码 代码如下:
--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]');
[code]
结果集为：
[code]
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>
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