如何解决在 SQL Server 上读取 XML：选择自定义属性
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>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]',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 | 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，
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>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]',EventKind =Events.value('(profile/custom-attributes/custom-attribute[@attribute-id = "loyaltyNumber"])[1]','varchar(60)')
FROM
@XML.nodes('/customers/customer') AS XTbl(Events)
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