MsSql教程网-SQL Server中的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 = ‘

<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:

<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.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(

‘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: <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 isa 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(‘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: <catalog>

2: <bookcategory=”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: <bookcategory=”条件替换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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