Question

我有一个非常复杂的XML问题，我花了几天时间试验代码并在互联网上搜索解决方案而没有任何快乐。

我正在调用一种服务，它以非常复杂和令人困惑的XML格式返回车辆数据。在一些地方，同一命名元素中存在未知数量的同名元素。我需要来自最低级别的一些属性信息，以及来自嵌套元素外部的一些信息。

我需要以下方面的帮助：（1）在价格信息的路上可以有零个，一个或十几个“类别”节点。（2）可以有多个'price'元素......第一个几乎总是零值，然后还有其他'ambiguousoption'元素，每个元素都有自己的'price'元素。（3）我需要进入路径的'category @id'值列表，以达到价格水平（如果有的话）。（4）我需要'category @id'值的堆栈对'ambiguousoption'敏感...第一个'ambiguousoption'列表中的任何'category @id'值，然后是第二个列表中的任何值。< / p>

我的代码中发生的事情是它抓住了每个'工厂选项'节点中的第一个（也是唯一的）'价格'信息，而不考虑可能有多个“价格”节点的事实。 'factoryoption'节点，'ambiguousoption'元素的一个外，然后每个'ambiguousoption'元素中的另一个'price'节点。

多么噩梦。这让我完全糊涂了。救命啊！

谢谢，帕特里克

declare @xml xml = '<vehicledescription bestmodelname="Sierra 1500" beststylename="4WD Crew Cab 143.5&quot; SLE" besttrimname="SLE" bestmakename="GMC" country="US" language="en" modelyear="2014"><factoryoption optionkindid="5" utf="M" fleetonly="false" standard="false" chromecode="FE9" oemcode="FE9"><header id="1156">EMISSIONS</header><description>EMISSIONS, FEDERAL REQUIREMENTS</description><price unknown="false" invoicemin="0" invoicemax="0" msrpmin="0" msrpmax="0"><styleid>358200</styleid><installed cause="OptionCodeBuild" /></price></factoryoption><factoryoption optionkindid="6" utf="E" fleetonly="false" standard="false" chromecode="L83" oemcode="L83"><header id="1160">ENGINE</header><description>ENGINE, 5.3L ECOTEC3 V8 WITH ACTIVE FUEL MANAGEMENT</description><category id="1052"><category id="1213"><price unknown="false" invoicemin="963.6" invoicemax="963.6" msrpmin="1095" msrpmax="1095"><styleid>358200</styleid><installed cause="Engine" /></price></category></category></factoryoption><factoryoption optionkindid="7" utf="T" fleetonly="false" standard="true" chromecode="MYC" oemcode="MYC"><header id="1379">TRANSMISSION</header><description>TRANSMISSION, 6-SPEED AUTOMATIC, ELECTRONICALLY CONTROLLED</description><category id="1104"><category id="1130"><category id="1131" removed="true"><price unknown="false" invoicemin="0" invoicemax="0" msrpmin="0" msrpmax="0"><styleid>358200</styleid><installed cause="OptionCodeBuild" /></price></category></category></category></factoryoption><factoryoption optionkindid="28" utf="F" standard="false" oemcode="H1Y"><header id="1347">SEAT TRIM</header><description>JET BLACK, LEATHER-APPOINTED FRONT SEAT TRIM</description><category id="1077" removed="true"><category id="1078"><category id="1079" removed="true"><category id="1309" removed="true"><price unknown="false" invoicemin="0" invoicemax="0" msrpmin="0" msrpmax="0"><styleid>358200</styleid><installed cause="OptionCodeBuild"><ambiguousoption optionkindid="28" utf="F" fleetonly="false" standard="false" chromecode="H1Y-R" oemcode="H1Y"><header id="1347">SEAT TRIM</header><description>JET BLACK, LEATHER-APPOINTED FRONT SEAT TRIM</description><category id="1074"><category id="1077" removed="true"><category id="1078"><category id="1079" removed="true"><category id="1309" removed="true"><price unknown="false" invoicemin="0" invoicemax="0" msrpmin="0" msrpmax="0"><styleid>358200</styleid></price></category></category></category></category></category></ambiguousoption><ambiguousoption optionkindid="28" utf="F" fleetonly="true" standard="false" chromecode="H1Y-F" oemcode="H1Y"><header id="1347">SEAT TRIM</header><description>JET BLACK, LEATHER-APPOINTED FRONT SEAT TRIM</description><category id="1077" removed="true"><category id="1078"><category id="1079" removed="true"><category id="1156"><category id="1309" removed="true"><price unknown="false" invoicemin="0" invoicemax="0" msrpmin="0" msrpmax="0"><styleid>358200</styleid></price></category></category></category></category></category></ambiguousoption></installed></price></category></category></category></category></factoryoption><factoryoption optionkindid="33" utf="A" fleetonly="false" standard="true" chromecode="IO5" oemcode="IO5"><header id="1301">RADIO</header><description>AUDIO SYSTEM, 8" DIAGONAL COLOR TOUCH SCREEN WITH INTELLILINK, AM/FM/SIRIUSXM/HD</description><category id="1014"><category id="1017" removed="true"><category id="1149"><category id="1150"><category id="1211"><category id="1230"><category id="1299"><price unknown="false" invoicemin="0" invoicemax="0" msrpmin="0" msrpmax="0"><styleid>358200</styleid><installed cause="OptionCodeBuild" /></price></category></category></category></category></category></category></category></factoryoption><factoryoption utf="0" standard="false" oemcode="PDU"><header id="10750">ADDITIONAL EQUIPMENT</header><description>SLE VALUE PACKAGE</description><category id="1009"><category id="1010"><category id="1011"><category id="1034"><category id="1074"><category id="1151"><category id="1204"><category id="1221"><price unknown="false" invoicemin="1425.6" invoicemax="1425.6" msrpmin="1620" msrpmax="1620"><styleid>358200</styleid><installed cause="OptionCodeBuild"><ambiguousoption utf="0" fleetonly="false" standard="false" chromecode="PDU-R" oemcode="PDU"><header id="10750">ADDITIONAL EQUIPMENT</header><description>SLE VALUE PACKAGE</description><category id="1009"><category id="1010"><category id="1011"><category id="1034"><category id="1074"><category id="1151"><category id="1204"><category id="1221"><price unknown="false" invoicemin="1425.6" invoicemax="1425.6" msrpmin="1620" msrpmax="1620"><styleid>358200</styleid></price></category></category></category></category></category></category></category></category></ambiguousoption><ambiguousoption utf="0" fleetonly="true" standard="false" chromecode="PDU-F" oemcode="PDU"><header id="10750">ADDITIONAL EQUIPMENT</header><description>SLE VALUE PACKAGE</description><category id="1009"><category id="1010"><category id="1011"><category id="1034"><category id="1074"><category id="1151"><category id="1204"><category id="1221"><price unknown="false" invoicemin="1425.6" invoicemax="1425.6" msrpmin="1620" msrpmax="1620"><styleid>358200</styleid></price></category></category></category></category></category></category></category></category></ambiguousoption></installed></price></category></category></category></category></category></category></category></category></factoryoption></vehicledescription>'
select @xml

SELECT
--  Nodes.node.value('.', 'varchar(max)') AS category,
  Nodes.node.value('(header/@id)[1]', 'varchar(100)') AS headerid,
  Nodes.node.value('(header/text())[1]', 'varchar(100)') AS headertext,
  Nodes.node.value('description[1]', 'varchar(100)') AS description,
  Nodes.node.value('(.//price/@invoicemin)[1]', 'money') AS invoicemin,
  Nodes.node.value('(.//price/@invoicemax)[1]', 'money') AS invoicemax,
  Nodes.node.value('(.//price/@msrpmin)[1]', 'money') AS msrpmin,
  Nodes.node.value('(.//price/@msrpmax)[1]', 'money') AS msrpmax,
  Nodes.node.value('(.//price/styleid/text())[1]', 'varchar(100)') AS styleid,
  Nodes.node.value('(.//price/installed/@cause)[1]', 'varchar(50)') AS installcause
FROM
  @xml.nodes('//factoryoption') AS Nodes(node);

Answer 1

逐步采取行动

FROM
  @xml.nodes('//factoryoption') AS Nodes(node);

无论深度如何，每个<factoryoption>元素只会产生一行。你需要扇动它。

FROM
  @xml.nodes('//factoryoption') AS Nodes1(factoryoption)
CROSS APPLY
  @xml.nodes('category') AS Nodes2(category)

这将为<category>

的子项的每个<factoryoption>元素生成一行

FROM
  @xml.nodes('//factoryoption') AS Nodes1(factoryoption)
CROSS APPLY
  factoryoption.nodes('category') AS Nodes2(category)
CROSS APPLY
  category.nodes('price') AS Nodes3(price)

这将为每个<price>元素生成一行，该元素是<category>的子元素<factoryoption>

的子元素

你需要先扇出你的xml。当您不这样做而改为使用(.//price/@invoicemin)[1]之类的内容时，您要求“不加选择地在整个子树中搜索具有<price>属性的@invoicemin元素，并返回[1] （首先）你找到的。

解析具有递归节点的复杂XML

1 个答案: