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：
代码如下：

declare @XMLVar XML;
SET @XMLVar= '

catalog
book category="ITPro"
titleWindows Step By Step/title
authorBill Zack/author
price49.99/price
/book
book category="Developer"
titleDeveloping ADO .NET/title
authorAndrew Brust/author
price39.93/price
/book
book category="ITPro"
titleWindows Cluster Server/title
authorStephen Forte/author
price59.99/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
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：
代码如下：

1: book category="ITPro"
2: first name="at first" /
3: titleWindows Step By Step/title
4: before name="before" /
5: authorBill Zack/author
6: after name="after" /
7: price49.99/price
8: last name="at last" /
9: /book



B.将多个元素插入文档中
代码如下：

--方法一：利用变量进行插入
DECLARE @newFeatures xml;
SET @newFeatures = N'; firstone element/first secondsecond 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 (firstone element/first,secondsecond element/second)
into (/catalog[1]/book[1]/author[1])'
SELECT @XMLVar.query('/catalog[1]/book[1]');

结果集为：
代码如下：

1: book category="ITPro"
2: titleWindows Step By Step/title
3: authorBill Zack
4: firstone element/first
5: secondsecond element/second
6: /author
7: price49.99/price
8: firstone element/first
9: secondsecond element/second
10: /book


C.将属性插入文档中
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：
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: price49.99/price
5: /book



D.插入文本节点
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：
代码如下：

1: book category="ITPro"
2: at first
3: titleWindows Step By Step/title
4: authorBill Zack/author
5: price49.99/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
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: titleWindows Step By Step/title
4: authorBill Zack/author
5: price49.99/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
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: titleWindows Step By Step/title
4: authorBill Zack/author
5: price49.99/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
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: titleWindows Step By Step/title
3: authorBill Zack/author
4: price49.99this is a 2 step/price
5: /book



2.XML.Modify(delete)语句介绍
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：
代码如下：

1: catalog
2: book
3: author /
4: price49.99/price
5: /book
6: book category="ITPro"
7: titleWindows Cluster Server/title
8: authorStephen Forte/author
9: price59.99/price
10: /book
11: /catalog


3.XML.Modify(replace)语句介绍
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: titleWindows Step By Step/title
4: author替换内容/author
5: price49.99/price
6: /book
7: book category="条件替换2"
8: titleDeveloping ADO .NET/title
9: authorAndrew Brust/author
10: price39.93/price
11: /book
12: book category="ITPro"
13: titleWindows Cluster Server/title
14: authorStephen Forte/author
15: price59.99/price
16: /book
17: /catalog