使用SQL Server选择XML节点

Question

我的XMLData存储在table。[column]下：dbo.promotions。[PromotionDiscountData]，当我扩展它时，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整理为dbo.promotions表中其他所有内容的列。 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。

的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);