使用 SQL Server 选择 XML 节点

Question

我的 XMLData 存储在 table.[column] 下：dbo.promotions.[PromotionDiscountData] 当我展开它时，XML 如下所示：

<ArrayOfPromotionDiscountBase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <PromotionDiscountBase xsi:type="OrderPromotionDiscount">
    <DiscountType>Fixed</DiscountType>
    <DiscountAmount>5.0000</DiscountAmount>
  </PromotionDiscountBase>
</ArrayOfPromotionDiscountBase>

我想导出报告并将 xml 展平为一列，其中包含 dbo.promotions 表中的所有其他内容。 从 xml 中获取 DiscountType 和 DiscountAmount 的最佳方法是什么？

谢谢！

Answer 1

请尝试以下方法。

SQL

-- DDL and data population, start
DECLARE @tbl TABLE (ID INT IDENTITY(1,1) PRIMARY KEY,[xmlData] XML NOT NULL);

INSERT INTO @tbl([xmlData])
VALUES 
(N'<ArrayOfPromotionDiscountBase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <PromotionDiscountBase xsi:type="OrderPromotionDiscount">
    <DiscountType>Fixed</DiscountType>
    <DiscountAmount>5.0000</DiscountAmount>
  </PromotionDiscountBase>
</ArrayOfPromotionDiscountBase>');
-- DDL and data population, end

SELECT ID
    , col.value('(DiscountType)[1]', 'VARCHAR(30)') AS [DiscountType]
    , col.value('(DiscountAmount)[1]', 'DECIMAL(10,4)') AS [DiscountAmount]
FROM @tbl AS tbl
      CROSS APPLY tbl.[xmlData].nodes('/ArrayOfPromotionDiscountBase/PromotionDiscountBase') AS tab(col);