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SQL Server中的XML数据进行insert、update、delete操作实现代码

  • 时间:2021-08-28 00:25 编辑: 来源: 阅读:
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摘要:SQL Server中的XML数据进行insert、update、delete操作实现代码
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:
[u]复制代码[/u] 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
[u]复制代码[/u] 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:
[u]复制代码[/u] 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
[u]复制代码[/u] 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:
[u]复制代码[/u] 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
[u]复制代码[/u] 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:
[u]复制代码[/u] 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
[u]复制代码[/u] 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:
[u]复制代码[/u] 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
[u]复制代码[/u] 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
[u]复制代码[/u] 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
[u]复制代码[/u] 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
[u]复制代码[/u] 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:
[u]复制代码[/u] 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
[u]复制代码[/u] 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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