Question

我正在尝试从XML表中检索数据。请考虑下表：

                  Customers      
Id      Last      First      Phone1      Phone2  
10      Doe       John      555-2121    555-6145
33     Smith      Sally     555-3333    555-7000

我想使用SQL中的FOR XML子句检索Last，First，Phone1和Phone2字段。但是，我想检索具有“晚上”属性的Phone2字段。例如，我希望XML看起来像：

<Customers>   
  <Customer>
        <Last>Doe</Last>
        <First>John</First>
        <Phone Type="Daytime">555-2121</Phone>
        <Phone Type="Evening">555-6145</Phone>   
  </Customer> 
</Customers>

然而，我无法让它发挥作用。有什么我想念的吗？任何和所有的帮助将不胜感激！

Answer 1

您可以在子查询中构建节点。如果指定for xml type，则子查询与外部查询合并以提供一个XML：

select  Last as [Last]
,       First as [First]
,       (
        select  'Daytime' as [@Type]
        ,       Phone1 as [*]
        for xml path('Phone'), type
        )
,       (
        select  'Evening' as [@Type]
        ,       Phone2 as [*]
        for xml path('Phone'), type
        )
from    Customers
for xml path('Customer'), root('Customers')

打印：

<Customers>
    <Customer>
        <Last>Doe</Last>
        <First>John</First>
        <Phone Type="Daytime">555-2121</Phone>
        <Phone Type="Evening">555-6145</Phone>
    </Customer>
    <Customer>
        <Last>Smith</Last>
        <First>Sally</First>
        <Phone Type="Daytime">555-3333</Phone>
        <Phone Type="Evening">555-7000</Phone>
    </Customer>
</Customers>

Live example at SQL Fiddle.

使用SQL中的FOR XML为同一属性选择多个值

1 个答案: