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sql-server - SQL 中的 XML 命名空间混淆

问题描述

我有一个 XML 文件，我需要对其进行一些修改。

我可以在 SQL 中很好地加载文件，但是当我尝试读取一些节点时，我什么也没有返回……也没有错误。我究竟做错了什么？

我的 XML 的开头是这样的：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<batch_request xmlns="http://sancrt.mpi.govt.nz/ecert/2013/batch-submission-schema.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://sancrt.mpi.govt.nz/ecert/2013/batch-submission-schema.xsd batchsubmission- schema.xsd">
  <raise_eligibility_document>
    <ed:Certificate xmlns="http://sancrt.mpi.govt.nz/ecert/2013/ed-multiple-submission-schema.xsd" xmlns:ed="http://sancrt.mpi.govt.nz/ecert/2013/ed-submission-schema.xsd">
      <ed:Identifiers>
        <ed:CertificateID>26920</ed:CertificateID>
        <ed:TemplateID>ED1</ed:TemplateID>
      </ed:Identifiers>
      <ed:DepartureDate>2021-03-10</ed:DepartureDate>
      <ed:Parties>
        <ed:ConsignorID>XX345</ed:ConsignorID>
        <ed:ConsigneeID>FLIGHT1</ed:ConsigneeID>
      </ed:Parties>

这是我加载和读取此文件的 SQL 语句以及我返回节点的尝试。

Declare  @xmlFile VARCHAR(30) = 'TESTING'

if OBJECT_ID('tempdb..#XmlImportTest') is not null
    drop table #XmlImportTest
  
CREATE TABLE #XmlImportTest(
xmlFileName VARCHAR(300) NOT NULL,
xml_data XML NOT NULL
);

declare @xmlpath varchar(200) = 'Location of file'

declare @xmlFileName varchar(200) = @xmlpath+@xmlFile+'.xml' 

--– dynamic sql is just so we can use @xmlFileName variable in OPENROWSET

EXEC('INSERT INTO #XmlImportTest(xmlFileName, xml_data)
        SELECT ''' + @xmlFileName + ''', xmlData
        FROM(
        SELECT *
        FROM OPENROWSET (BULK ''' + @xmlFileName + ''', SINGLE_BLOB) AS XMLDATA
        ) AS FileImport (XMLDATA)
    ')


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


select @xml = (SELECT xml_data from #XmlImportTest)

--select @xml

;with xmlnamespaces (
  'http://sancrt.mpi.govt.nz/ecert/2013/ed-multiple-submission-schema.xsd' as multiple,
  'http://sancrt.mpi.govt.nz/ecert/2013/ed-submission-schema.xsd' as submission 
)

        select
   
         header.value(N'(submission:Identifiers/submission:CertificateID/text())[1]', N'nvarchar(20)') as ecert_number
 
        from @xml.nodes('/submission:Certificate') as ci(header)

这不返回任何内容。

我也试过这个：

from   

    @xml.nodes('/submission:batch_request/submission:raise_eligibility_document/submission:Certificate') as ci(header)

我还尝试将以下内容用于提交名称空间

;with xmlnamespaces (
  'http://sancrt.mpi.govt.nz/ecert/2013/ed-multiple-submission-schema.xsd' as multiple,
  --'http://sancrt.mpi.govt.nz/ecert/2013/ed-submission-schema.xsd' as submission ,
  'http://sancrt.mpi.govt.nz/ecert/2013/batch-submission-schema.xsd' as submission
)

我仍然一无所有..请问我哪里出了问题？

标签： sql-serverxmlsql-server-2016xml-namespaces

解决方案

这是一个完整的再现如何正确地做到这一点。

需要提及的要点：

  • 只有两个名称空间与提供的 XML 摘录相关。其中之一是默认命名空间，因此不需要它的前缀。第二个命名空间需要“ed”前缀。
  • .nodes()现在，在两个位置（即.value()XQuery 方法）中都有适当的 XPath 表达式。

SQL

DECLARE @xml XML =
N'<batch_request xmlns="http://sancrt.mpi.govt.nz/ecert/2013/batch-submission-schema.xsd"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xsi:schemaLocation="http://sancrt.mpi.govt.nz/ecert/2013/batch-submission-schema.xsd batchsubmission- schema.xsd">
    <raise_eligibility_document>
        <ed:Certificate xmlns="http://sancrt.mpi.govt.nz/ecert/2013/ed-multiple-submission-schema.xsd"
                        xmlns:ed="http://sancrt.mpi.govt.nz/ecert/2013/ed-submission-schema.xsd">
            <ed:Identifiers>
                <ed:CertificateID>26920</ed:CertificateID>
                <ed:TemplateID>ED1</ed:TemplateID>
            </ed:Identifiers>
            <ed:DepartureDate>2021-03-10</ed:DepartureDate>
            <ed:Parties>
                <ed:ConsignorID>XX345</ed:ConsignorID>
                <ed:ConsigneeID>FLIGHT1</ed:ConsigneeID>
            </ed:Parties>
        </ed:Certificate>
    </raise_eligibility_document>
</batch_request>';

WITH XMLNAMESPACES (DEFAULT 'http://sancrt.mpi.govt.nz/ecert/2013/batch-submission-schema.xsd'
    , 'http://sancrt.mpi.govt.nz/ecert/2013/ed-submission-schema.xsd' AS ed)
SELECT c.value('(ed:Identifiers/ed:CertificateID/text())[1]', 'VARCHAR(30)') AS CertificateID
    , c.value('(ed:Identifiers/ed:TemplateID/text())[1]', 'VARCHAR(30)') AS TemplateID
    , c.value('(ed:DepartureDate/text())[1]', 'DATE') AS DepartureDate
    , c.value('(ed:Parties/ed:ConsignorID/text())[1]', 'VARCHAR(30)') AS ConsignorID
    , c.value('(ed:Parties/ed:ConsigneeID/text())[1]', 'VARCHAR(30)') AS ConsigneeID
FROM @xml.nodes('/batch_request/raise_eligibility_document/ed:Certificate') AS t(c);

输出

+---------------+------------+---------------+-------------+-------------+
| CertificateID | TemplateID | DepartureDate | ConsignorID | ConsigneeID |
+---------------+------------+---------------+-------------+-------------+
|         26920 | ED1        | 2021-03-10    | XX345       | FLIGHT1     |
+---------------+------------+---------------+-------------+-------------+

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