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 = ‘



Bill Zack49.99


Andrew Brust39.93


Stephen Forte59.99

‘
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 as first into (/catalog[1]/book[1])’
)
set
@XMLVar.modify
(
‘insert as last into (/catalog[1]/book[1])’
)
set
@XMLVar.modify
(
‘insert before (/catalog[1]/book[1]/author[1])’
)
set
@XMLVar.modify
(
‘insert after (/catalog[1]/book[1]/author[1])’
)
SELECT
@XMLVar.query(‘/catalog[1]/book[1]’
);
结果集为：
>
/>

/>
Bill Zack
/> 49.99/>

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’

one element
second element‘
SET @XMLVar.modify(‘
)
insert sql:variable(“@newFeatures”)
into (/catalog[1]/book[1])’
–方法二：直接插入
set @XMLVar.modify(‘
)
insert (one element,second element)
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:
var=”变量插入”
>
2:

3:
name=”多值插入2″
>Bill Zack
4: 49.995:

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(
‘insert
)
before (/catalog[1]/book[1]/title[1])’
SELECT @XMLVar.query(‘/catalog[1]/book[1]’
);
结果集为：
1:
>
2:

3:

4:
Bill Zack
5: 49.996:

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
)
before (/catalog[1]/book[1]/title[1])’
SELECT @XMLVar.query(‘/catalog[1]/book[1]’
);
结果集为：
1:
2:
3:
4: Bill Zack
5: 49.996:
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:
2:
3: Bill Zack
4: 49.99this isa 2 step5:
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:
2:
3:
4: 49.995:
6:
7:
8: Stephen Forte
9: 59.9910:
11:
3.XML.Modify(replace)语句介绍
–替换属性
set @XMLVar.modify(‘replace value of(/catalog[1]/book[1]/@category))
with (“替换属性”)’
–替换内容
set @XMLVar.modify(‘replace value of(/catalog[1]/book[1]/author[1]/text()[1]))
with(“替换内容”)’
–条件替换
set @XMLVar.modify(‘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:
2:
3:
4: 替换内容
5: 49.996:
7:
8:
9:

Andrew Brust
10: 39.9311:
12:
13:
14: Stephen Forte
15: 59.9916:
17: