在 SQL 服务器上读取 XML：Select 自定义属性

Question

我正在尝试阅读 XML，它总体上运行良好，除了名为 :

的属性

<custom-attribute attribute-id="loyaltyNumber">1234567890</custom-attribute>

我正在尝试获取值“1234567890”

这里是测试代码：

DECLARE @XML XML = '<customers>
<customer customer-no="00000001">
        <credentials>
            <login>test@email.com</login>
        </credentials>
        <profile>
            <preferred-locale>fr_BE</preferred-locale>
            <custom-attributes>
                <custom-attribute attribute-id="ServiceId">1</custom-attribute>
                <custom-attribute attribute-id="loyaltyNumber">1234567890</custom-attribute>
            </custom-attributes>
        </profile>
        <note/>
    </customer>
    <customer customer-no="00000002">
        <credentials>
            <login>test2@email.com</login>
        </credentials>
        <profile>
            <preferred-locale>fr_FR</preferred-locale>
            <custom-attributes>
                <custom-attribute attribute-id="loyaltyNumber">1234567890</custom-attribute>
            </custom-attributes>
        </profile>
        <note/>
    </customer>
</customers>'
 
SELECT
    CustomerNo = Events.value('@customer-no', 'int'),
    --EventType = Events.value('@Type', 'varchar(20)'),
    CustomerLogin =Events.value('(credentials/login)[1]', 'varchar(60)'),
    CustomerLocal =Events.value('(profile/preferred-locale)[1]', 'varchar(60)'),
    EventKind =Events.value('(profile/custom-attributes/custom-attribute)[2]', 'varchar(60)')
FROM
    @XML.nodes('/customers/customer') AS XTbl(Events)

当前结果为：

CustomerNo	CustomerLogin	CustomerLocal	EventKind
1	test@email.com	fr_BE	1234567890
2	test2@email.com	fr_FR	NULL

这是合乎逻辑的，因为自定义属性是可选的，因此您无法使用索引访问它们。所以我正在寻找一种通过名称访问它们的方法：attribute-id="loyaltyNumber"

谢谢，

Answer 1

..过滤具有 attribute-id = “loyaltyNumber”

的属性的路径

EventKind =Events.value('(profile/custom-attributes/custom-attribute[@attribute-id="loyaltyNumber"])[1]', 'varchar(60)')

Answer 2

您只需将自定义属性的 attribute-id 添加到您的查询即可：

DECLARE @XML XML = '<customers>
<customer customer-no="00000001">
        <credentials>
            <login>test@email.com</login>
        </credentials>
        <profile>
            <preferred-locale>fr_BE</preferred-locale>
            <custom-attributes>
                <custom-attribute attribute-id="ServiceId">1</custom-attribute>
                <custom-attribute attribute-id="loyaltyNumber">1234567890</custom-attribute>
            </custom-attributes>
        </profile>
        <note/>
    </customer>
    <customer customer-no="00000002">
        <credentials>
            <login>test2@email.com</login>
        </credentials>
        <profile>
            <preferred-locale>fr_FR</preferred-locale>
            <custom-attributes>
                <custom-attribute attribute-id="loyaltyNumber">1234567777</custom-attribute>
            </custom-attributes>
        </profile>
        <note/>
    </customer>
</customers>'
 
SELECT
    CustomerNo = Events.value('@customer-no', 'int'),
    --EventType = Events.value('@Type', 'varchar(20)'),
    CustomerLogin =Events.value('(credentials/login)[1]', 'varchar(60)'),
    CustomerLocal =Events.value('(profile/preferred-locale)[1]', 'varchar(60)'),
    EventKind =Events.value('(profile/custom-attributes/custom-attribute[@attribute-id = "loyaltyNumber"])[1]', 'varchar(60)')
FROM
 @XML.nodes('/customers/customer') AS XTbl(Events)

在 SQL 服务器上读取 XML：Select 自定义属性

Read XML on SQL Server : Select custom attribute

sql-server

sql-server-2019

readxml