SQL 服务器 - XML 加载问题

Question

'嗨，我正在尝试创建自动 XML 加载到 SQL 中，最初我需要使用正确的数据集创建 table。最后，我试图获取序列号、IP 地址和时区以及 "From to " 到“时间戳”的所有计数值这是我的 XML 的样子：

<response xmlns="http://www.test.com/sensor-api/v2">
  <sensor-time timezone="America/New_York">2017-07-18T15:45:03-04:00</sensor-time>
  <status>
    <code>OK</code>
  </status>
  <sensor-info>
    <serial-number>Q8:80:39:60:9Z:F2</serial-number>
    <ip-address>192.167.130.18</ip-address>
    <name>Test</name>
    <group />
    <device-type>PC2 - UL</device-type>
  </sensor-info>
  <content>
    <elements>
      <element>
        <element-id>2</element-id>
        <element-name>Conf_Lower_Zone</element-name>
        <sensor-type>SINGLE_SENSOR</sensor-type>
        <data-type>ZONE</data-type>
        <from>2017-07-18T15:40:00-04:00</from>
        <to>2017-07-18T15:45:00-04:00</to>
        <resolution>ONE_MINUTE</resolution>
          <measurements>
            <measurement>
              <from>2017-07-18T15:40:00-04:00</from>
              <to>2017-07-18T15:41:00-04:00</to>
              <values>
                <value label="count">0</value>
              </values>
            </measurement>
          <measurement>
              <from>2017-07-18T15:41:00-04:00</from>
              <to>2017-07-18T15:42:00-04:00</to>
               <values>
                  <value label="count">0</value>
               </values>
          </measurement>

这是我的 SQL 部分：

CREATE DATABASE OPENXMLTesting
GO

USE OPENXMLTesting
GO

CREATE TABLE XMLwithOpenXML
(
Id INT IDENTITY PRIMARY KEY,
XMLData XML,
LoadedDateTime DATETIME
)

INSERT INTO XMLwithOpenXML(XMLData, LoadedDateTime)
SELECT CONVERT(XML, BulkColumn) AS BulkColumn, GETDATE() 
FROM OPENROWSET(BULK 'C:\Example\Test.xml', SINGLE_BLOB) AS x;

SELECT * FROM XMLwithOpenXML

USE OPENXMLTesting
GO

DECLARE @XML AS XML, @hDoc AS INT, @SQL NVARCHAR (MAX)

SELECT @XML = XMLData FROM XMLwithOpenXML

EXEC sp_xml_preparedocument @hDoc OUTPUT, @XML

SELECT [element-id], [element-name], [data-type], [ip-address]

FROM OPENXML(@hDoc, 
'content/elements/element/measurements/measurement/values/value')

WITH 
(   
    [element-id] varchar (100) '@ElementID',
    [element-name] varchar(50) '@Element_Name',
    [data-type] varchar(50) '@Data_Type',
    [ip-address] varchar(50) '@IP_Address'
)

EXEC sp_xml_removedocument @hDoc
GO

问题是我得到的结果是 headers，下面没有任何数据。见下图。

我做错了什么？

Answer 1

有两个问题...

首先涉及到命名空间。因为它是默认命名空间，所以您必须声明或使用通配符。

其次，选择的方法 FROM OPENXML 与两个存储过程一起创建和删除文档已经完全过时了。您应该使用现代原生 XML 方法。试试这个：

DECLARE @xml XML=
N'<response xmlns="http://www.test.com/sensor-api/v2">
  <sensor-time timezone="America/New_York">2017-07-18T15:45:03-04:00</sensor-time>
  <status>
    <code>OK</code>
  </status>
  <sensor-info>
    <serial-number>Q8:80:39:60:9Z:F2</serial-number>
    <ip-address>192.167.130.18</ip-address>
    <name>Test</name>
    <group />
    <device-type>PC2 - UL</device-type>
  </sensor-info>
  <content>
    <elements>
      <element>
        <element-id>2</element-id>
        <element-name>Conf_Lower_Zone</element-name>
        <sensor-type>SINGLE_SENSOR</sensor-type>
        <data-type>ZONE</data-type>
        <from>2017-07-18T15:40:00-04:00</from>
        <to>2017-07-18T15:45:00-04:00</to>
        <resolution>ONE_MINUTE</resolution>
        <measurements>
          <measurement>
            <from>2017-07-18T15:40:00-04:00</from>
            <to>2017-07-18T15:41:00-04:00</to>
            <values>
              <value label="count">0</value>
            </values>
          </measurement>
          <measurement>
            <from>2017-07-18T15:41:00-04:00</from>
            <to>2017-07-18T15:42:00-04:00</to>
            <values>
              <value label="count">0</value>
            </values>
          </measurement>
        </measurements>
      </element>
    </elements>
  </content>
</response>';

--查询需要声明命名空间
--我将使用直接调用来获取奇异值
--...和 .nodes() 以获得一组 1:n 相关元素

WITH XMLNAMESPACES(DEFAULT 'http://www.test.com/sensor-api/v2')
SELECT @xml.value('(/response/sensor-time/@timezone)[1]','nvarchar(max)') AS SensortTime_TimeZone
      ,@xml.value('(/response/sensor-time/text())[1]','datetime') AS SensortTime
      ,@xml.value('(/response/status/code/text())[1]','nvarchar(max)') AS StatusCode
      ,@xml.value('(/response/sensor-info/serial-number/text())[1]','nvarchar(max)') AS SerialNumber
      ,e.value('(element-id/text())[1]','int') AS ElementId
      ,e.value('(element-name/text())[1]','nvarchar(max)') AS ElementName
      --more from here
      ,m.value('(from/text())[1]','datetime') AS Measurement_From
      ,m.value('(to/text())[1]','datetime') AS Measurement_To
      ,m.value('(values/value/@label)[1]','nvarchar(max)') AS Measurement_Label
      ,m.value('(values/value/text())[1]','int') AS Measurement_Label
FROM @xml.nodes('/response/content/elements/element') A(e)
OUTER APPLY e.nodes('measurements/measurement') B(m);

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