SQL Server中操作XML数据的示例详解

CREATE TABLE Products (
    ProductID INT PRIMARY KEY,
    ProductName NVARCHAR(100),
    ProductDetails XML
);

INSERT INTO Products (ProductID, ProductName, ProductDetails)
VALUES
(1, '笔记本电脑', '<Product><Specifications><Processor>英特尔 i7</Processor><RAM>16GB</RAM><Storage>512GB SSD</Storage></Specifications><Price>1500</Price></Product>'),
(2, '智能手机', '<Product><Specifications><Processor>骁龙 888</Processor><RAM>8GB</RAM><Storage>128GB</Storage></Specifications><Price>700</Price></Product>');

SELECT 
    ProductID,
    ProductName,
    ProductDetails.value('(/Product/Specifications/Processor)[1]', 'NVARCHAR(100)') AS Processor
FROM Products;

SELECT 
    ProductID,
    ProductName,
    Specs.value('(/Product/Specifications/Processor)[1]', 'NVARCHAR(100)') AS Processor,
    Specs.value('(/Product/Specifications/RAM)[1]', 'NVARCHAR(100)') AS RAM,
    Specs.value('(/Product/Specifications/Storage)[1]', 'NVARCHAR(100)') AS Storage
FROM Products
CROSS APPLY ProductDetails.nodes('/Product') AS Specs(Specifications);

UPDATE Products
SET ProductDetails.modify('replace value of (/Product/Price/text())[1] with "1400"')
WHERE ProductName = '笔记本电脑';

SELECT ProductID, ProductName, ProductDetails
FROM Products
FOR XML PATH('Product'), ROOT('Products');

<Products>
  <Product>
    <ProductID>1</ProductID>
    <ProductName>笔记本电脑</ProductName>
    <ProductDetails>
      <Product>
        <Specifications>
          <Processor>英特尔 i7</Processor>
          <RAM>16GB</RAM>
          <Storage>512GB SSD</Storage>
        </Specifications>
        <Price>1500</Price>
      </Product>
    </ProductDetails>
  </Product>
  <!-- 更多产品 -->
</Products>

WITH XMLData AS (
    SELECT ProductID, ProductDetails
    FROM Products
)
SELECT
    ProductID,
    Specifications.value('(/Product/Specifications/Processor)[1]', 'NVARCHAR(100)') AS Processor,
    Specifications.value('(/Product/Specifications/RAM)[1]', 'NVARCHAR(100)') AS RAM,
    Specifications.value('(/Product/Specifications/Storage)[1]', 'NVARCHAR(100)') AS Storage
FROM XMLData
CROSS APPLY ProductDetails.nodes('/Product') AS Specs(Specifications);