在 SQL Server 上读取 XML：选择自定义属性

问题描述

我正在尝试读取 XML，除了名为 :

的属性外，它总体上运行良好

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

我正在尝试获取值“1234567890”

测试代码如下：

DECLARE @XML XML = '<customers>
<customer customer-no="00000001">
        <credentials>
            <login>[e-mail]</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>[e-mail]</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]',EventKind =Events.value('(profile/custom-attributes/custom-attribute)[2]','varchar(60)')
FROM
    @XML.nodes('/customers/customer') AS XTbl(Events)

当前结果是：

CustomerNo	客户登录	客户本地	EventKind
1	[e-mail]	fr_BE	1234567890
2	[e-mail]	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，

解决方法

..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)')

,

您只需将自定义属性的属性 ID 添加到您的查询中即可：

DECLARE @XML XML = '<customers>
<customer customer-no="00000001">
        <credentials>
            <login>[e-mail]</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>[e-mail]</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]',EventKind =Events.value('(profile/custom-attributes/custom-attribute[@attribute-id = "loyaltyNumber"])[1]','varchar(60)')
FROM
 @XML.nodes('/customers/customer') AS XTbl(Events)