XML操作很少用到,最近查询个语句,还得到官网查看用法。所以按照官方把相关的DML都操作一遍,作为记录!~
-- 测试数据 -- DROP TABLE #XMLTab CREATE TABLE #XMLTab(colxml XML) GO INSERT INTO #XMLTab SELECT N' <Record dt="2015-05-05"> <Exception type="RING_BUFFER_EXCEPTION"> <Task address="0x0062B8E8" /> <Error>9003</Error> <Severity>error</Severity> </Exception> <Exception type="BUFFER_EXCEPTION"> <Task address="0xC452BB39" /> <Error>8008</Error> <Severity>true</Severity> <Other>00</Other> </Exception> </Record>' GO INSERT INTO #XMLTab SELECT N' <p1:Record dt="2015-05-06" xmlns:p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"> <p1:Exception type="RING_BUFFER_EXCEPTION"> <p1:Task address="0x0062B8E8" /> <p1:Error>9003</p1:Error> <p1:Severity>error</p1:Severity> </p1:Exception> <p1:Exception type="BUFFER_EXCEPTION"> <p1:Task address="0xC452BB39" /> <p1:Error>8008</p1:Error> <p1:Severity>true</p1:Severity> <p1:Other>00</p1:Other> </p1:Exception> </p1:Record>' GO
--节点插入
insert Expression1({asfirst
| as
last} into
| after|
before Expression2
)
--删除XML实例的节点
delete Expression
--在文档中更新节点的值
replace
value of Expression1with
Expression2
-- 在根路径"/Record/"的第一个"/Exception"下,添加删除一个元素"<Address>".还可以使用{as first | as last}指定位置 UPDATE #XMLTab SET colxml.modify('insert <Address>insert test 1</Address> into (/Record/Exception)[1]'); UPDATE #XMLTab SET colxml.modify('insert <Address>insert test 1</Address> as first into (/Record/Exception)[1]'); -- 删除所有元素"Address" UPDATE #XMLTab SET colxml.modify('delete /Record/Exception[1]/Address'); UPDATE #XMLTab SET colxml.modify('delete /Record/Exception[1]/Address[1]');
-- 在根路径"/Record/"的第二个"/Exception"下,添加删除一个元素"<Address>" UPDATE #XMLTab SET colxml.modify('insert <Address>insert test 1</Address> into (/Record/Exception)[2]'); -- 删除第二个节点"/Exception"下的所有元素"Address" UPDATE #XMLTab SET colxml.modify('delete /Record/Exception[2]/Address'); UPDATE #XMLTab SET colxml.modify('delete /Record/Exception[2]/Address[1]');
-- 删除"/Record/Exception/"下的第2个元素(即在Exception中第二行的删除) UPDATE #XMLTab SET colxml.modify('delete /Record/Exception/*[2]')
-- 删除所有路径"/Record/Exception"下的元素"<Address>" UPDATE #XMLTab SET colxml.modify('delete /Record/Exception/Address[1]'); UPDATE #XMLTab SET colxml.modify('delete /Record/Exception/Address');
各种路径表达式都指定“[1]”或者“[2]”等,要求每次只返回单个目标。
在重新删除创建测试表
-- 插入一个元素变量(连续执行4次,方便下面测试) DECLARE @newFeatures xml; SET @newFeatures = N'<Address></Address>' UPDATE #XMLTab SET colxml.modify('insert sql:variable("@newFeatures") into (/Record/Exception)[1]');
-- 插入一个属性到元素"<Address />"(接上步操作)(多个元素相同,以Address[1]/[2]/[3]/[4]区分) UPDATE #XMLTab SET colxml.modify('insert attribute attrName {"attributeA" } into (/Record/Exception/Address[1])[1]'); UPDATE #XMLTab SET colxml.modify('insert attribute attrName {"attributeB" } into (/Record/Exception/Address[2])[1]'); UPDATE #XMLTab SET colxml.modify('insert attribute attrName {"attributeA" } into (/Record/Exception/Address[3])[1]'); UPDATE #XMLTab SET colxml.modify('insert attribute attrName {"attributeB" } into (/Record/Exception/Address[4])[1]');
-- 插入一个属性到元素"<Address />",其中条件为[attrName="attributeB"],(每个元素以Address[1]/[2]/[3]/[4]区分) UPDATE #XMLTab SET colxml.modify(' insert attribute attrName2 {"0.5" } into (/Record/Exception/Address[4][@attrName="attributeB"])[1]');--成功:第四个Address,attrName="attributeB" UPDATE #XMLTab SET colxml.modify(' insert attribute attrName3 {"0.5" } into (/Record/Exception/Address[4][@attrName="attributeA"])[1]');--失败:第四个Address,attrName<>"attributeA"
-- 删除路径"/Record/Exception/Address"中"Address"的属性"attrName"(所有) UPDATE #XMLTab SET colxml.modify('delete /Record/Exception/Address/@attrName'); UPDATE #XMLTab SET colxml.modify('delete /Record/Exception/Address/@attrName2');
-- 变量插入属性值 DECLARE @Hrs FLOAT SET @Hrs =0.5 UPDATE #XMLTab SET colxml.modify('insert attribute attrName {sql:variable("@Hrs")} into (/Record/Exception/Task)[1]');
-- 插入多个属性值 UPDATE #XMLTab SET colxml.modify(' insert ( attribute attrName2 {"0.5" }, attribute attrName3 {".2"} ) into (/Record/Exception/Task)[1]');
-- 插入注释元素(在第3个Address后插入) UPDATE #XMLTab SET colxml.modify('insert <!-- some comment --> after (/Record/Exception/Address[3])[1]');
-- 使用"before"在跟目录前(头部)插入处理指令 UPDATE #XMLTab SET colxml.modify('insert <?Program = "Instructions.exe" ?> before (/Record)[1]');
-- 还可以利用"after" 和 "before" 的方法插入一个元素 UPDATE #XMLTab SET colxml.modify('insert <Address></Address> after (/Record/Exception/Address[1])[1]'); UPDATE #XMLTab SET colxml.modify('insert <Address></Address> before (/Record/Exception/Address[1])[1]');
-- 添加删除文本(添加文本后,该元素格式显示成一行) UPDATE #XMLTab SET colxml.modify('insert text{"Product Catalog Description"} as first into (/Record/Exception)[1]'); -- 删除后查看,格式正常 UPDATE #XMLTab SET colxml.modify('delete /Record/Exception/text()'); -- 以下为添加后的格式
-- 按条件更改增加属性: --如果"/Record/Exception/Address[3]"的属性attrName="attributeB",则增加属性attrName="10",否则增加属性attrName="50" UPDATE #XMLTab SET colxml.modify(' insert if (/Record/Exception/Address[3][@attrName="attributeB"]) then attribute attrName {"10"} else attribute attrName {"50"} as first into (/Record/Exception/Address[3])[1] ');
-- 将元素"<Error>9003</Error>"中的文本值"9003"改为"10000"() UPDATE #XMLTab SET colxml.modify('replace value of (/Record/Exception/Error[1]/text())[1] with "10000" '); -- 将元素"Task"的属性"address"的值改为"100" UPDATE #XMLTab SET colxml.modify('replace value of (/Record/Exception/Task/@address)[1] with "100" '); UPDATE #XMLTab SET colxml.modify('replace value of (/Record/Exception/Task[1]/@address)[2] with "999" ');
--如果/Record/路径下第一个Exception中,元素Address个数大于3,则更新Exception[1]属性type为"10.0"否则为"20.0" UPDATE #XMLTab SET colxml.modify(' replace value of (/Record/Exception[1]/@type)[1] with ( if (count(/Record/Exception[1]/Address) > 3) then "10.0" else "20.0" )');
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以下为XML相关查询
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-- 查询某个元素中的所有所有子项 SELECT colxml.query('/Record/Exception') FROM #XMLTab SELECT colxml.query('//Record/Exception/Address') FROM #XMLTab --图为第二个查询语句的结果
-- 元素带前缀的查询.之前在临时表插入的第二行数据,现在有用了!~ SELECT colxml.query(' declare namespace p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"; /p1:Record/p1:Exception') FROM #XMLTab
-- 条件查询用,如果在 exist() 方法中指定 true() 或 false() 函数,则总是返回 1 SELECT colxml FROM #XMLTab WHERE colxml.exist('true()')=1 SELECT colxml FROM #XMLTab WHERE colxml.exist('false()')=1
-- 查看节点"/Record"的属性"@dt"日期是否为"2015-05-05" -- 元素中的属性转换为日志比较(也可以作为查询条件的判断) -- 参考构造函数:https://msdn.microsoft.com/zh-cn/library/ms189547.aspx SELECT colxml ,colxml.exist('/Record[(@dt cast as xs:date?) eq xs:date("2015-05-05")]') ,colxml.exist('/Record[(@dt cast as xs:date?) eq xs:date("2015-05-10")]') FROM #XMLTab
-- 文本判断:"/Record/Exception/Error"中的文本,只要其中一个符合就返回"1" SELECT colxml ,colxml.exist('/Record/Exception/Error[(text()[1] cast as xs:string ?) = xs:string("9003") ]') ,colxml.exist('/Record/Exception/Error[(text()[1] cast as xs:string ?) = xs:string("8008") ]') ,colxml.exist('/Record/Exception[1]/Error[(text()[1] cast as xs:string ?) = xs:string("9003") ]') ,colxml.exist('/Record/Exception[2]/Error[(text()[1] cast as xs:string ?) = xs:string("8008") ]') FROM #XMLTab
-- 带前缀的查询方法 SELECT colxml ,colxml.exist(' declare namespace p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"; /p1:Record/p1:Exception/p1:Error[(text()[1] cast as xs:string ?) = xs:string("9003") ]') ,colxml.exist(' declare namespace p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"; /p1:Record/p1:Exception/p1:Error[(text()[1] cast as xs:string ?) = xs:string("8008") ]') ,colxml.exist(' declare namespace p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"; /p1:Record/p1:Exception[1]/p1:Error[(text()[1] cast as xs:string ?) = xs:string("9003") ]') ,colxml.exist(' declare namespace p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"; /p1:Record/p1:Exception[2]/p1:Error[(text()[1] cast as xs:string ?) = xs:string("8008") ]') FROM #XMLTab
-- 还可以简写为: WITH XMLNAMESPACES ('http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription' AS p1) SELECT colxml ,colxml.exist('/p1:Record/p1:Exception/p1:Error[(text()[1] cast as xs:string ?) = xs:string("9003") ]') ,colxml.exist('/p1:Record/p1:Exception/p1:Error[(text()[1] cast as xs:string ?) = xs:string("8008") ]') ,colxml.exist('/p1:Record/p1:Exception[1]/p1:Error[(text()[1] cast as xs:string ?) = xs:string("9003") ]') ,colxml.exist('/p1:Record/p1:Exception[2]/p1:Error[(text()[1] cast as xs:string ?) = xs:string("8008") ]') FROM #XMLTab
-- 元素判断:元素中的其他元素是否存在.为1则是该节点中不包含的. SELECT colxml ,colxml.exist('/Record/Exception[1][not(Other)]') --1:元素"Exception[1]"不包含元素"Other" ,colxml.exist('/Record/Exception[2][not(Other)]') --0:元素"Exception[2]"包含元素"Other" ,colxml.exist(' declare namespace p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"; /p1:Record/p1:Exception[1][not(p1:Other)]') --1:元素"p1:Exception[1]"不包含元素"p1:Other" ,colxml.exist(' declare namespace p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"; /p1:Record/p1:Exception[2][not(p1:Other)]') --0:元素"p1:Exception[2]"包含元素"p1:Other" FROM #XMLTab
-- 使用"value"查询属性值和元素文本值 SELECT colxml.value('(/Record/Exception/Task/@address)[1]','varchar(100)') AS [address1] ,colxml.value('(/Record/Exception[2]/Task/@address)[1]','varchar(100)') AS [address2] ,colxml.value('data(/Record/Exception[1]/Error)[1]','int') AS [Error1] ,colxml.value('data(/Record/Exception[2]/Error)[1]','int') AS [Error2] ,colxml.value(' declare namespace p1="http://schemas.microsoft.com/sqlserver/2004/07/adventure-works/ProductModelDescription"; data(/p1:Record/p1:Exception[2]/p1:Error)[1] ','int') AS [p1:Error2] FROM #XMLTab
-- 使用"query"查询属性值 SELECT CONVERT(NVARCHAR(100),colxml.query('data(/Record/@dt)')) AS [id] ,CONVERT(NVARCHAR(100),colxml.query('data(/Record/Exception/@type)[1]')) AS [type1] ,CONVERT(NVARCHAR(100),colxml.query('data(/Record/Exception/@type)[2]')) AS [type2] ,CONVERT(NVARCHAR(100),colxml.query('data(/Record/Exception[2]/@type)[1]')) AS [type2] ,CONVERT(NVARCHAR(100),colxml.query('data(/Record/Exception/@type)')) AS [type1 type2] FROM #XMLTab
-- 可以当做查询条件: SELECT * FROM #XMLTab WHERE CONVERT(NVARCHAR(100),colxml.query('data(/Record/@dt)'))='2015-05-05'
-- 使用"nodes"中"value"查询属性值和元素文本值 SELECT node.c1.query('data(/Record/@dt)') ,CONVERT(NVARCHAR(100),colxml.query('data(/Record/@dt)')) AS [id] ,node.c1.value('(@dt)','VARCHAR(50)') AS [id] ,node.c1.value('(@dt)[1]','VARCHAR(50)') AS [id] ,node.c1.value('(Exception/@type)[1]','VARCHAR(50)') AS [type1] ,node.c1.value('(Exception/Error)[1]','VARCHAR(50)') AS [Error1] FROM #XMLTab CROSS APPLY colxml.nodes('/Record') as node(c1)
好了!~21图,测试到这。
XML类型的DML操作开始并不好记,看来只有多写语句才能记得。而这只是XML相关操作中很小的一部分。XML还涉及有类型化和非类型化的XML、XML类型导入导出、XML索引(主索引/辅索引/全文索引)、FOR XML的使用、XML架构集合等。太多!~有待学习!
时间: 2024-10-09 23:45:43