Question

如何对SQL Server中的XML数据进行insert、update、delete

Answer 1

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： 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 --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: <bookcategory="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: <bookcategory="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 <?

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--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：