使用 SQL 获取 XML 节点中的值

Question

我在 SQL 表列中有一个 XML。 我需要解码这个 xml 并获取特定节点的值。 在下面找到我的 XML

<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Header/>
    <SOAP-ENV:Body>
        <ns:createTransactionResponse
            xmlns:impl="http://office/work/services/service1"
            xmlns:ns="http://www.regfrez.com/schemas/service1_V2/SharedResources/XMLSchema/Schema.xsd"
            xmlns:tns="http://www.erdeftq.ae/Activematrix/ESB/service1/1_0">
            <transactionResponse>
                <transaction-info>
                    <registrationId>R1234</registrationId>
                    <trialId>T12345</trialId>
                    <transactionId>12345</transactionId>
                    <transactionDate>27-02-2020:08:47</transactionDate>
                    <status>Confirmed</status>
                </transaction-info>
            </transactionResponse>
        </ns:createTransactionResponse>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>

我需要节点的值：registrationId、transactionId 和 status，我尝试了这个，但无法成功，因为我得到了空值：

DECLARE @xml XML
SET @xml = 'XML here'
SELECT T.C.value('@status', 'nvarchar(100)') FROM @xml.nodes('createTransactionResponse/transactionResponse/transaction-info/status') T(C)
SELECT T.C.value('@trans', 'nvarchar(100)') FROM @xml.nodes('createTransactionResponse/transactionResponse/transaction-info/transactionId') T(C)
SELECT T.C.value('@id', 'nvarchar(100)') FROM @xml.nodes('createTransactionResponse/transactionResponse/transaction-info/registrationId') T(C)

任何帮助/更正将不胜感激

Answer 1

您自己的尝试是忽略命名空间并且没有指定完整的 XPath。

尝试以下方法之一：

你的 XML：

DECLARE @xml XML
SET @xml = '<SOAP-ENV:Envelope
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Header/>
    <SOAP-ENV:Body>
        <ns:createTransactionResponse
            xmlns:impl="http://office/work/services/service1"
            xmlns:ns="http://www.regfrez.com/schemas/service1_V2/SharedResources/XMLSchema/Schema.xsd"
            xmlns:tns="http://www.erdeftq.ae/Activematrix/ESB/service1/1_0">
            <transactionResponse>
                <transaction-info>
                    <registrationId>R1234</registrationId>
                    <trialId>T12345</trialId>
                    <transactionId>12345</transactionId>
                    <transactionDate>27-02-2020:08:47</transactionDate>
                    <status>Confirmed</status>
                </transaction-info>
            </transactionResponse>
        </ns:createTransactionResponse>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>';

--这是最明确的（这总是最好的方法）：

WITH XMLNAMESPACES('http://schemas.xmlsoap.org/soap/envelope/' AS n1
                  ,'http://www.regfrez.com/schemas/service1_V2/SharedResources/XMLSchema/Schema.xsd' AS n2)
SELECT @xml.value('(/n1:Envelope/n1:Body/n2:createTransactionResponse/transactionResponse/transaction-info/registrationId/text())[1]','nvarchar(max)') AS RegistrationId
      ,@xml.value('(/n1:Envelope/n1:Body/n2:createTransactionResponse/transactionResponse/transaction-info/transactionId/text())[1]','nvarchar(max)') AS TransactionId
      ,@xml.value('(/n1:Envelope/n1:Body/n2:createTransactionResponse/transactionResponse/transaction-info/status/text())[1]','nvarchar(max)') AS [Status];

-- 这将避免一些重复的 XPath，但.nodes()会产生相当多的开销：

WITH XMLNAMESPACES('http://schemas.xmlsoap.org/soap/envelope/' AS n1
                  ,'http://www.regfrez.com/schemas/service1_V2/SharedResources/XMLSchema/Schema.xsd' AS n2)
SELECT ti.value('(registrationId/text())[1]','nvarchar(max)') AS RegistrationId
      ,ti.value('(transactionId/text())[1]','nvarchar(max)') AS TransactionId
      ,ti.value('(status/text())[1]','nvarchar(max)') AS [Status]
FROM @xml.nodes('/n1:Envelope/n1:Body/n2:createTransactionResponse/transactionResponse/transaction-info') A(ti);

--这是给懒人的:-)

SELECT @xml.value('(//*:registrationId)[1]','nvarchar(max)') AS RegistrationId
      ,@xml.value('(//*:transactionId)[1]','nvarchar(max)') AS TransactionId
      ,@xml.value('(//*:status)[1]','nvarchar(max)') AS [Status];

提示：最后一个（对于懒人）使用深度搜索（使用// ）并使用通配符作为命名空间。 如果元素可能在您的 XML 中出现多次，这是非常危险的。

Answer 2

您拥有的 XML 非常复杂。 您有多个命名空间，不同的节点使用不同的命名空间。 这意味着您需要使用WITH XMLNAMESPACES来声明所有这些。

然后，您需要使用nodes导航到所需的节点，为它们添加适当的命名空间前缀，直到到达transaction-info 。 然后你使用 use value来获取信息。

@Status不是你在这里追求的，那是因为你有类似<node status=1\\> ，你需要获取节点的text()值。

这导致以下结果：

DECLARE @X xml = '<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    <SOAP-ENV:Header/>
    <SOAP-ENV:Body>
        <ns:createTransactionResponse
            xmlns:impl="http://traffic2/traffic/services/service1"
            xmlns:ns="http://www.regfrez.com/schemas/service1_V2/SharedResources/XMLSchema/Schema.xsd"
            xmlns:tns="http://www.abc.ae/Activematrix/ESB/service1/1_0">
            <transactionResponse>
                <transaction-info>
                    <registrationId>R1234</registrationId>
                    <trialId>T12345</trialId>
                    <transactionId>12345</transactionId>
                    <transactionDate>27-02-2020:08:47</transactionDate>
                    <status>Confirmed</status>
                </transaction-info>
            </transactionResponse>
        </ns:createTransactionResponse>
    </SOAP-ENV:Body>
</SOAP-ENV:Envelope>';

WITH XMLNAMESPACES ('http://schemas.xmlsoap.org/soap/envelope/' AS [SOAP-ENV],
                    'http://traffic2/traffic/services/service1' AS impl, --YOu don't use this in the XML, but incldued anyway, for completeness
                    'http://www.regfrez.com/schemas/service1_V2/SharedResources/XMLSchema/Schema.xsd' AS ns,
                    'http://www.abc.ae/Activematrix/ESB/service1/1_0' AS tns) --YOu don't use this in the XML, but incldued anyway, for completeness
SELECT ti.value('(status/text())[1]','varchar(10)') AS [Status],
       ti.value('(transactionId/text())[1]','int') AS Trans,
       ti.value('(registrationId/text())[1]','varchar(10)') AS ID
FROM @X.nodes('SOAP-ENV:Envelope/SOAP-ENV:Body/ns:createTransactionResponse/transactionResponse/transaction-info') N(ti);