1.xml.exist 输入为XQuery表达式,返回0,1或是Null。0表示不存在,1表示存在,Null表示输入为空 2.xml.value 输入为XQuery表达式,返回一个SQL Server标量值 3.xml.query 输入为XQuery表达式,返回一个
1.xml.exist 输入为XQuery表达式,返回0,1或是Null。0表示不存在,1表示存在,Null表示输入为空 2.xml.value 输入为XQuery表达式,返回一个SQL Server标量值 3.xml.query 输入为XQuery表达式,返回一个SQL Server XML类型流 4.xml.nodes 输入为XQuery表达式,返回一个XML格式文档的一列行集 5.xml.modify 使用XQuery表达式对XML的节点进行insert , update 和 delete 操作。 下面通过例子对上面的五种操作进行说明: 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.exist select @XMLVar.exist('/catalog/book')-----返回1 select @XMLVar.exist('/catalog/book/@category')-----返回1 select @XMLVar.exist('/catalog/book1')-----返回0 set @XMLVar = null select @XMLVar.exist('/catalog/book')-----返回null 2.xml.value select @XMLVar.value('/catalog[1]/book[1]','varchar(MAX)') select @XMLVar.value('/catalog[1]/book[2]/@category','varchar(MAX)') select @XMLVar.value('/catalog[2]/book[1]','varchar(MAX)') 结果集为: Windows Step By StepBill Zack49.99 Developer NULL 3.xml.query select @XMLVar.query('/catalog[1]/book') select @XMLVar.query('/catalog[1]/book[1]') select @XMLVar.query('/catalog[1]/book[2]/author') 结果集分别为: <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> <book category="ITPro"> <title>Windows Step By Step</title> <author>Bill Zack</author> <price>49.99</price> </book> <author>Andrew Brust</author> 4.xml.nodes select T.c.query('.') as result from @XMLVar.nodes('/catalog/book') as T(c) select T.c.query('title') as result from @XMLVar.nodes('/catalog/book') as T(c) 结果集分别为: <book category="ITPro"><title>Windows Step By Step</title><author>Bill ………… <book category="Developer"><title>Developing ADO .NET</title><author>Andrew ………… <book category="ITPro"><title>Windows Cluster Server</title><author>Stephen ………… <title>Windows Step By Step</title> <title>Developing ADO .NET</title> <title>Windows Cluster Server</title> 5.xml.modify 关于modify内容,请参见下一篇文章。