Question

DECLARE @x AS XML;
SET @x = N'
<CustomersOrders>
    <Customer custid="1">
      <companyname>Customer NRZBB</companyname>
      <Order orderid="10692">
        <orderdate>2007-10-03T00:00:00</orderdate>
      </Order>
      <Order orderid="10702">
        <orderdate>2007-10-13T00:00:00</orderdate>
      </Order>
      <Order orderid="10952">
        <orderdate>2008-03-16T00:00:00</orderdate>
      </Order>
    </Customer>
    <Customer custid="2">
      <companyname>Customer MLTDN</companyname>
      <Order orderid="10308">
        <orderdate>2006-09-18T00:00:00</orderdate>
      </Order>
      <Order orderid="10926">
        <orderdate>2008-03-04T00:00:00</orderdate>
      </Order>
    </Customer>
</CustomersOrders>';

SELECT
    T.c.value('./@custid','INT') AS custid,
    T.c.value('./companyname','NVARCHAR(30)') AS companyname,
    T.C.value('../@orderid','INT') AS orderid
FROM  @x.nodes('//Customer') T(c)

我正在尝试将xml数据分解为表，但是我收到错误：

XQuery [value（）]：'value（）'需要单例（或空序列），找到类型为'xdt：untypedAtomic *'的操作数

结果应与此处的结果类似：

custid  companyname     orderid  orderdate
1       Customer NRZBB  10692    2007-10-03 00:00:00.000
1       Customer NRZBB  10702    2007-10-13 00:00:00.000
1       Customer NRZBB  10952    2008-03-16 00:00:00.000
2       Customer MLTDN  10308    2006-09-18 00:00:00.000
2       Customer MLTDN  10926    2008-03-04 00:00:00.000

Answer 1

您只需要返回1个元素，例如：

SELECT
    T.c.value('../@custid[1]','INT') AS custid,
    T.c.value('../companyname[1]','NVARCHAR(30)') AS companyname,
    T.c.value('./@orderid[1]','INT') AS orderid,
    T.c.value('./orderdate[1]','datetime') AS orderdate
FROM  @x.nodes('//Customer/Order') T(c)

Answer 2

您需要使用两个嵌套调用.nodes()来处理1：n个客户，每个客户都有1：n个订单：

SELECT
    CustId = XC.value('@custid', 'INT') ,
    CompanyName = XC.value('(companyname)[1]', 'NVARCHAR(30)'),
    OrderID = XO.value('@orderid', 'INT'),
    OrderDate = XO.value('(orderdate)[1]', 'DATETIME2(3)')
FROM  
    @x.nodes('/CustomersOrders/Customer') AS XT(XC)
CROSS APPLY
    XC.nodes('Order') AS XT2(XO)

我想在SQL Server中将XML数据切换为表格格式

2 个答案: