Question

我试图以通常的方式查询以下XML，但是由于其声明以及空的“ NextQuantity”-“ NextDate”字段，我在查询XML时遇到了麻烦。

什么是正确的方法？

谢谢。

<StocksResp xmlns="http://xxxxxx" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
  <Stocks>
    <Stock>
      <Sku>30101.06-L</Sku>
      <Quantity>247610</Quantity>
      <NextQuantity1>15243</NextQuantity1>
      <NextDate1>2019-02-27</NextDate1>
      <NextQuantity2 i:nil="true" />
      <NextDate2 />
      <NextQuantity3 i:nil="true" />
      <NextDate3 />
      <NextQuantity4 i:nil="true" />
      <NextDate4 />
      <NextQuantity5 i:nil="true" />
      <NextDate5 />
      <NextQuantity6 i:nil="true" />
      <NextDate6 />
    </Stock>
    <Stock>
      <Sku>30101.06-M</Sku>
      <Quantity>241606</Quantity>
      <NextQuantity1 i:nil="true" />
      <NextDate1 />
      <NextQuantity2 i:nil="true" />
      <NextDate2 />
      <NextQuantity3 i:nil="true" />
      <NextDate3 />
      <NextQuantity4 i:nil="true" />
      <NextDate4 />
      <NextQuantity5 i:nil="true" />
      <NextDate5 />
      <NextQuantity6 i:nil="true" />
      <NextDate6 />
    </Stock>
 </Stocks>
  <Count>4837</Count>
  <Currency i:nil="true" />
  <Language>ES</Language>
  <ErrorCode i:nil="true" />
  <ErrorMessage i:nil="true" />
</StocksResp>

================================================

DECLARE @xml XML
SELECT @xml = x.y FROM OPENROWSET (BULK 'file.xml',SINGLE_BLOB) as x(y)

SELECT  
   x.y.value('Sku[1]','varchar(15)'),
   x.y.value('Quantity[1]','int'),
   x.y.value('NextDate1[1]','varchar(20)'),
   x.y.value('NextQuantity1[1]','int'),
   'mr'
FROM   @xml.nodes('Stocks/Stock') x(y)

Answer 1

可以提供帮助吗？

DECLARE @xml XML=
N'<StocksResp xmlns="http://xxxxxx" xmlns:i="http://www.w3.org/2001/XMLSchema-instance">
  <Stocks>
    <Stock>
      <Sku>30101.06-L</Sku>
      <Quantity>247610</Quantity>
      <NextQuantity1>15243</NextQuantity1>
      <NextDate1>2019-02-27</NextDate1>
      <NextQuantity2 i:nil="true" />
      <NextDate2 />
      <NextQuantity3 i:nil="true" />
      <NextDate3 />
      <NextQuantity4 i:nil="true" />
      <NextDate4 />
      <NextQuantity5 i:nil="true" />
      <NextDate5 />
      <NextQuantity6 i:nil="true" />
      <NextDate6 />
    </Stock>
    <Stock>
      <Sku>30101.06-M</Sku>
      <Quantity>241606</Quantity>
      <NextQuantity1 i:nil="true" />
      <NextDate1 />
      <NextQuantity2 i:nil="true" />
      <NextDate2 />
      <NextQuantity3 i:nil="true" />
      <NextDate3 />
      <NextQuantity4 i:nil="true" />
      <NextDate4 />
      <NextQuantity5 i:nil="true" />
      <NextDate5 />
      <NextQuantity6 i:nil="true" />
      <NextDate6 />
    </Stock>
 </Stocks>
  <Count>4837</Count>
  <Currency i:nil="true" />
  <Language>ES</Language>
  <ErrorCode i:nil="true" />
  <ErrorMessage i:nil="true" />
</StocksResp>';

-您需要声明默认名称空间。您无需声明名称空间i ...

WITH XMLNAMESPACES(DEFAULT 'http://xxxxxx','http://www.w3.org/2001/XMLSchema-instance' AS i)
SELECT 
       @xml.value(N'(/StocksResp/Count/text())[1]',N'int') AS StockResp_Count
      ,@xml.value(N'(/StocksResp/Currency/text())[1]',N'int') AS StockResp_Currency 
      ,st.value(N'(Sku/text())[1]',N'nvarchar(max)') AS Stock_Sku
      ,st.value(N'(Quantity/text())[1]',N'int') AS Stock_Quantity
      ,st.value(N'(NextQuantity1/text())[1]',N'int') AS Stock_NextQuantity1
      ,st.value(N'(NextDate1/text())[1]',N'date') AS Stock_NextDate1
      ,st.value(N'(NextQuantity2/text())[1]',N'int') AS Stock_NextQuantity2
      ,st.value(N'(NextDate2/text())[1]',N'date') AS Stock_NextDate2
      ,st.value(N'(NextQuantity3/text())[1]',N'int') AS Stock_NextQuantity3
      ,st.value(N'(NextDate3/text())[1]',N'date') AS Stock_NextDate3
      ,st.value(N'(NextQuantity4/text())[1]',N'int') AS Stock_NextQuantity4
      ,st.value(N'(NextDate4/text())[1]',N'date') AS Stock_NextDate4
      ,st.value(N'(NextQuantity5/text())[1]',N'int') AS Stock_NextQuantity5
      ,st.value(N'(NextDate5/text())[1]',N'date') AS Stock_NextDate5
      ,st.value(N'(NextQuantity6/text())[1]',N'int') AS Stock_NextQuantity6
      ,st.value(N'(NextDate6/text())[1]',N'date') AS Stock_NextDate6
FROM   @xml.nodes('/StocksResp/Stocks/Stock') A(st);

一些评论：

使用 name-number 元素（Date1，Date2等）是一个非常不好的习惯。如果可以更改此设置，则应使用一组嵌套元素，并根据它们的位置或诸如

之类的属性对其进行编号。

<Next index="1">
   <Date>2018-01-01</Date>
   <Quantity>1</Quantity>
</Next>
[... more of them ...]

您可以看到，我直接从变量中读取了一次值，而重复元素是由.nodes()从派生表中获取的。

查询问题

1 个答案: