从 SQL Server 中的 XML 列中提取值

Question

我正在尝试从以下 XML 中提取 FirstName 和 LastName 中存在的数据值，该 XML 在 SQL Server 表的列中作为字符串存在。

<ns6:Account xmlns="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactmodel" xmlns:ns2="http://example.com/pc/gx/abc.pc.dm.gx.shared.location.addressmodel" xmlns:ns4="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.officialidmodel" xmlns:ns3="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactaddressmodel" xmlns:ns6="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc" xmlns:ns5="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.accountcontactmodel" xmlns:ns8="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.usermodel" xmlns:ns7="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.historymodel" xmlns:ns13="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc" xmlns:ns9="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.activitymodel" xmlns:ns12="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.industrycodemodel" xmlns:ns11="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.documentmodel" xmlns:ns10="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.groupmodel" xmlns:ns17="http://example.com/pc/gx/abc.pc.dm.gx.shared.producer.producercodemodel" xmlns:ns16="http://example.com/pc/gx/abc.pc.dm.gx.shared.producer.accountproducercodemodel" xmlns:ns15="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.notemodel" xmlns:ns14="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc">
    <ns6:AccountHolderContact>
        <entity-Person>
            <DateOfBirth>999-01-02T12:00:00-05:00</DateOfBirth>
            <FirstName>ABC</FirstName>
            <Gender>F</Gender>
            <LastName>ABC</LastName>
            <LicenseNumber>9999-9999-9999</LicenseNumber>
            <LicenseState>AA</LicenseState>
            <MaritalStatus>S</MaritalStatus>
            <OrganizationType_IC>individual</OrganizationType_IC>
        </entity-Person>
        <HomePhone>9999999999</HomePhone>
        <PrimaryAddress>
            <ns2:AddressLine1>99 ABC St</ns2:AddressLine1>
            <ns2:AddressType>home</ns2:AddressType>
            <ns2:City>AAA</ns2:City>
            <ns2:Country>AA</ns2:Country>
            <ns2:PostalCode>ABC MMM</ns2:PostalCode>
            <ns2:State>AA</ns2:State>
            <ns2:Subtype>Address</ns2:Subtype>
        </PrimaryAddress>
        <PublicID>1</PublicID>
        <Subtype>person</Subtype>
    </ns6:AccountHolderContact>
</ns6:Account>

这是我尝试过的查询：

select 
    application_id, accountID, 
    cast(payload as xml).value('(//*:Account//*:AccountHolderContact)[1]', 'varchar(max)') as FirstName
from
    [test1].[dbo].[test2]

此查询从 XML 节点 <AccountHolderContact> 返回所有子节点中的数据。

999-01-02T12:00:00-05:00ABCFABC9999-9999-9999AASIndividual999999999999 ABC SthomeAAAAAABC MMMAAAddress1Person

当我将查询更改为以下内容时，我的输出列 FirstName 中没有数据：

select 
    application_id, accountID, 
    cast(payload as xml).value('(//*:Account//*:AccountHolderContact/entity-Person/FirstName)[1]','varchar(max)') as FirstName
from
    [test1].[dbo].[test2]

我无法从AccountHolderContact 的子节点中提取是否有原因？如果没有，最简单的方法是什么？

Answer 1

您的 XML 有多个命名空间 - 总共 17 个。只应考虑其中两个。由于性能原因，最好不要使用命名空间通配符。

以下是如何分解您的 XML 并检索您需要的内容。

SQL

-- DDL and sample data population, start
DECLARE @tbl TABLE (ID INT IDENTITY PRIMARY KEY, payload NVARCHAR(MAX));
INSERT INTO @tbl (payload) VALUES
(N'<?xml version="1.0"?>
<ns6:Account xmlns="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactmodel"
             xmlns:ns2="http://example.com/pc/gx/abc.pc.dm.gx.shared.location.addressmodel"
             xmlns:ns4="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.officialidmodel"
             xmlns:ns3="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactaddressmodel"
             xmlns:ns6="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc"
             xmlns:ns5="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.accountcontactmodel"
             xmlns:ns8="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.usermodel"
             xmlns:ns7="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.historymodel"
             xmlns:ns13="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc"
             xmlns:ns9="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.activitymodel"
             xmlns:ns12="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.industrycodemodel"
             xmlns:ns11="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.documentmodel"
             xmlns:ns10="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.groupmodel"
             xmlns:ns17="http://example.com/pc/gx/abc.pc.dm.gx.shared.producer.producercodemodel"
             xmlns:ns16="http://example.com/pc/gx/abc.pc.dm.gx.shared.producer.accountproducercodemodel"
             xmlns:ns15="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.notemodel"
             xmlns:ns14="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc">
    <ns6:AccountHolderContact>
        <entity-Person>
            <DateOfBirth>999-01-02T12:00:00-05:00</DateOfBirth>
            <FirstName>ABC</FirstName>
            <Gender>F</Gender>
            <LastName>ABC</LastName>
            <LicenseNumber>9999-9999-9999</LicenseNumber>
            <LicenseState>AA</LicenseState>
            <MaritalStatus>S</MaritalStatus>
            <OrganizationType_IC>individual</OrganizationType_IC>
        </entity-Person>
        <HomePhone>9999999999</HomePhone>
        <PrimaryAddress>
            <ns2:AddressLine1>99 ABC St</ns2:AddressLine1>
            <ns2:AddressType>home</ns2:AddressType>
            <ns2:City>AAA</ns2:City>
            <ns2:Country>AA</ns2:Country>
            <ns2:PostalCode>ABC MMM</ns2:PostalCode>
            <ns2:State>AA</ns2:State>
            <ns2:Subtype>Address</ns2:Subtype>
        </PrimaryAddress>
        <PublicID>1</PublicID>
        <Subtype>person</Subtype>
    </ns6:AccountHolderContact>
</ns6:Account>');
-- DDL and sample data population, end

;WITH XMLNAMESPACES (DEFAULT 'http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactmodel'
    , 'http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc' AS ns14) ,rs AS
(
   SELECT id, TRY_CAST(payload AS XML) AS xmldata
   FROM @tbl
)
SELECT ID
   , c.value('(FirstName/text())[1]','VARCHAR(50)') AS FirstName
   , c.value('(LastName/text())[1]','VARCHAR(50)') AS LastName
FROM rs CROSS APPLY rs.xmldata.nodes('/ns14:Account/ns14:AccountHolderContact/entity-Person') AS t(c);

输出

+----+-----------+----------+
| ID | FirstName | LastName |
+----+-----------+----------+
|  1 | ABC       | ABC      |
+----+-----------+----------+

Answer 2

假设XML只能包含1个AccountHolderContact实体（或类似实体），那么可以使用WITHXMLSPACES和XML运算符value来获取信息：

DECLARE @XML xml = '<ns6:Account xmlns="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactmodel" xmlns:ns2="http://example.com/pc/gx/abc.pc.dm.gx.shared.location.addressmodel" xmlns:ns4="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.officialidmodel" xmlns:ns3="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactaddressmodel" xmlns:ns6="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc" xmlns:ns5="http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.accountcontactmodel" xmlns:ns8="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.usermodel" xmlns:ns7="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.historymodel" xmlns:ns13="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc" xmlns:ns9="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.activitymodel" xmlns:ns12="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.industrycodemodel" xmlns:ns11="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.documentmodel" xmlns:ns10="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.groupmodel" xmlns:ns17="http://example.com/pc/gx/abc.pc.dm.gx.shared.producer.producercodemodel" xmlns:ns16="http://example.com/pc/gx/abc.pc.dm.gx.shared.producer.accountproducercodemodel" xmlns:ns15="http://example.com/pc/gx/abc.pc.dm.gx.shared.general.notemodel" xmlns:ns14="http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc">
    <ns6:AccountHolderContact>
        <entity-Person>
            <DateOfBirth>999-01-02T12:00:00-05:00</DateOfBirth>
            <FirstName>ABC</FirstName>
            <Gender>F</Gender>
            <LastName>ABC</LastName>
            <LicenseNumber>9999-9999-9999</LicenseNumber>
            <LicenseState>AA</LicenseState>
            <MaritalStatus>S</MaritalStatus>
            <OrganizationType_IC>individual</OrganizationType_IC>
        </entity-Person>
        <HomePhone>9999999999</HomePhone>
        <PrimaryAddress>
            <ns2:AddressLine1>99 ABC St</ns2:AddressLine1>
            <ns2:AddressType>home</ns2:AddressType>
            <ns2:City>AAA</ns2:City>
            <ns2:Country>AA</ns2:Country>
            <ns2:PostalCode>ABC MMM</ns2:PostalCode>
            <ns2:State>AA</ns2:State>
            <ns2:Subtype>Address</ns2:Subtype>
        </PrimaryAddress>
        <PublicID>1</PublicID>
        <Subtype>person</Subtype>
    </ns6:AccountHolderContact>
</ns6:Account>';

WITH XMLNAMESPACES(DEFAULT 'http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactmodel', 'http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc' AS ns6)
SELECT V.X.value('(ns6:Account/ns6:AccountHolderContact/entity-Person/FirstName/text())[1]','nvarchar(20)') AS FirstName,
       V.X.value('(ns6:Account/ns6:AccountHolderContact/entity-Person/LastName/text())[1]','nvarchar(20)') AS FirstName
FROM(VALUES(@XML))V(X);

但是，如果您的数据中可能有不止一个人，那么您可以使用 nodes 获取每人 1 行（这仍会带回具有相同样本数据的行）。如果AccountHolderContact 是重复项，它将如下所示：

WITH XMLNAMESPACES(DEFAULT 'http://example.com/pc/gx/abc.pc.dm.gx.shared.contact.contactmodel', 'http://example.com/pc/gx/abc.pc.dm.gx.base.account.abc' AS ns6)
SELECT A.AHC.value('(entity-Person/FirstName/text())[1]','nvarchar(20)') AS FirstName,
       A.AHC.value('(entity-Person/LastName/text())[1]','nvarchar(20)') AS FirstName
FROM(VALUES(@XML))V(X)
    CROSS APPLY V.X.nodes('ns6:Account/ns6:AccountHolderContact')A(AHC);