SQL SERVER 解析XML

_小黑_2025-10-28 18:54

sql 复制代码

DECLARE @xml XML = '
<Customers>
    <Customer CustomerID="C001">
        <Name>王五</Name>
        <Contacts>
            <Phone>13800138000</Phone>
            <Email>wangwu@example.com</Email>
        </Contacts>
        <Orders>
            <Order>
                <OrderID>2001</OrderID>
                <Amount>3000.00</Amount>
            </Order>
            <Order>
                <OrderID>2002</OrderID>
                <Amount>1500.00</Amount>
            </Order>
        </Orders>
    </Customer>
</Customers>'

-- 解析嵌套结构
SELECT 
    CustomerNode.value('@CustomerID', 'NVARCHAR(20)') AS CustomerID,
    CustomerNode.value('(Name)[1]', 'NVARCHAR(50)') AS CustomerName,
    CustomerNode.value('(Contacts/Phone)[1]', 'NVARCHAR(20)') AS Phone,
    CustomerNode.value('(Contacts/Email)[1]', 'NVARCHAR(100)') AS Email,
    OrderNode.value('(OrderID)[1]', 'INT') AS OrderID,
    OrderNode.value('(Amount)[1]', 'DECIMAL(10,2)') AS Amount
FROM @xml.nodes('/Customers/Customer') AS T(CustomerNode)
CROSS APPLY CustomerNode.nodes('Orders/Order') AS O(OrderNode)

这段SQL代码演示了如何解析XML格式的嵌套客户数据。通过XQuery方法，代码从XML变量中提取客户信息（ID、姓名、电话、邮箱）以及每个客户的多个订单明细（订单ID、金额）。使用nodes()方法分别定位客户节点和订单节点，再通过value()方法提取具体字段值，最后使用CROSS APPLY将客户信息与订单明细关联输出。这种技术适用于处理包含多层嵌套结构的XML数据。