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SQL Server中的XML數(shù)據(jù)進(jìn)行insert、update、delete

SQL Server中新增加了XML.Modify()方法，分別為xml.modify(insert),xml.modify(delete),xml.modify(replace)對(duì)應(yīng)XML的插入，刪除和修改操作。
本文以下面XML為例，對(duì)三種DML進(jìn)行說明：
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>
'
1.XML.Modify(Insert)語句介紹
A.利用as first,at last,before,after四個(gè)參數(shù)將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]'
);
結(jié)果集為：
book category="ITPro"
>
first name="at first"
/>
title>Windows Step By Step/title>
before name="before"
/>
author>Bill Zack/author>
after name="after"
/>
price>49.99/price>
last name="at last"
/>
/book>
B.將多個(gè)元素插入文檔中
--方法一：利用變量進(jìn)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]'
);
結(jié)果集為：
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.將屬性插入文檔中
--使用變量插入
declare @var nvarchar(10) = '變量插入'
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]'
);
結(jié)果集為：
1:
book category="ITPro"
var="變量插入"
>
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.插入文本節(jié)點(diǎn)
set
@XMLVar.modify
(
'insert text{"at first"} as first
)
into (/catalog[1]/book[1])'
SELECT
@XMLVar.query('/catalog[1]/book[1]'
);
結(jié)果集為：
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：插入本文同樣具體 as first，as last，before，after四種選項(xiàng)，可以參考A中的使用方法
E.插入注釋節(jié)點(diǎn)
set @XMLVar.modify(
'insert !--插入評(píng)論-->
)
before (/catalog[1]/book[1]/title[1])'
SELECT @XMLVar.query('/catalog[1]/book[1]'
);
結(jié)果集為：
1:
book category="ITPro"
>
2:
!--插入評(píng)論-->
3:
title>Windows Step By Step/title>
4:
author>Bill Zack/author>
5:
price>49.99/price>
6:
/book>
注意插入注釋節(jié)點(diǎn)同樣具體 as first，as last，before，after四種選項(xiàng)，可以參考A中的使用方法
F.插入處理指令
set @XMLVar.modify(
'insert ?Program "Instructions.exe" ?>
)
before (/catalog[1]/book[1]/title[1])'
SELECT @XMLVar.query('/catalog[1]/book[1]'
);
結(jié)果集為：
1: bookcategory="ITPro">
2: ?Program"Instructions.exe"?>
3: title>Windows Step By Step/title>
4: author>Bill Zack/author>
5: price>49.99/price>
6: /book>
注意插入處理指令同樣具體 as first，as last，before，after四種選項(xiàng)，可以參考A中的使用方法
G.根據(jù) if 條件語句進(jìn)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]'
);
結(jié)果集為：
1: book category="ITPro">
2: title>Windows Step By Step/title>
3: author>Bill Zack/author>
4: price>49.99this isa 2 step/price>
5: /book>
2.XML.Modify(delete)語句介紹
--刪除屬性
set @XMLVar.modify('delete /catalog[1]/book[1]/@category')
--刪除節(jié)點(diǎn)
set @XMLVar.modify('delete /catalog[1]/book[1]/title[1]')
--刪除內(nèi)容
set @XMLVar.modify('delete /catalog[1]/book[1]/author[1]/text()')
--全部刪除
set @XMLVar.modify('delete /catalog[1]/book[2]')
SELECT @XMLVar.query('/catalog[1]');
結(jié)果集為：
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)語句介紹
--替換屬性
set @XMLVar.modify('replace value of(/catalog[1]/book[1]/@category))
with ("替換屬性")'
--替換內(nèi)容
set @XMLVar.modify('replace value of(/catalog[1]/book[1]/author[1]/text()[1]))
with("替換內(nèi)容")'
--條件替換
set @XMLVar.modify('replace value of (/catalog[1]/book[2]/@category))
with(
if(count(/catalog[1]/book)>4) then
"條件替換1"
else
"條件替換2")'
SELECT @XMLVar.query('/catalog[1]'
);
結(jié)果集為：
1: catalog>
2: bookcategory="替換屬性">
3: title>Windows Step By Step/title>
4: author>替換內(nèi)容/author>
5: price>49.99/price>
6: /book>
7: bookcategory="條件替換2">
8: title>
Developing ADO .NET/title>
9:
author>
Andrew Brust/author>
10: price>39.93/price>
11: /book>
12: bookcategory="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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