Question

我根据XML值中的特定条件获取数据。想法是让一个表具有两列ID和数据（XML dataType）。我必须获取特定ID的数据。

以下是示例，我希望仅将结果显示为Sears Tower的第一行。我有两排。

IF OBJECT_ID('tempdb..#ExistExample') IS NOT NULL
DROP TABLE #ExistExample
GO

CREATE TABLE #ExistExample
(
  XMLID Int,
  XMLDocument xml
)

INSERT INTO #ExistExample
VALUES (100,'<Buildings>
  <Building>
    <Name>Sears Tower</Name>
    <Floor1>Yes</Floor1>
    <Floor2>Yes</Floor2>
    <Floor3>No</Floor3>
  </Building>
  <Building>
    <Name>IDS Building</Name>
      <Floor1>Yes</Floor1>
      <Floor2>Yes</Floor2>
      <Floor3>Yes</Floor3>
  </Building>
</Buildings>')

DECLARE @data varchar(1000)
DECLARE @ID INT
SET @ID = 101
SET @data = 'Sears Tower'

INSERT INTO #ExistExample
VALUES (101,'<Buildings>
  <Building>
    <Name>Sears Tower</Name>
    <Floor1>Yes</Floor1>
    <Floor2>Yes</Floor2>
    <Floor3>No</Floor3>
  </Building>
  <Building>
    <Name>IDS Building</Name>
      <Floor1>Yes</Floor1>
      <Floor2>Yes</Floor2>
      <Floor3>Yes</Floor3>
  </Building>
</Buildings>')

--SELECT * FROM #ExistExample

SELECT 
c.value('(Name/text())[1]','varchar(25)') AS BuildingName,
c.value('(Floor1/text())[1]','varchar(25)') AS Floor1,
c.value('(Floor2/text())[1]','varchar(25)') AS Floor2,
c.value('(Floor3/text())[1]','varchar(25)') AS Floor3
FROM #ExistExample
CROSS APPLY XMLDocument.nodes('/Buildings/Building') as t(c)
WHERE c.exist('//Building/Name[.=sql:variable("@data")]') = 1
AND XMLID = @ID

Answer 1

使用：

DriverDetails/DriverDetail[ID eq 1]/*[not(self::ID)]

或者，如果你认为这更简单：

DriverDetails/DriverDetail[ID eq 1]/(PRN | Name))

这里假设（对于两个XPath表达式）表达式被评估为具有DriverDetails的父对象的初始上下文节点。

Answer 2

得到了答案。这应该是：

SELECT c.value('(Name/text())[1]','varchar(25)') AS BuildingName, 
c.value('(Floor1/text())[1]','varchar(25)') AS Floor1, 
c.value('(Floor2/text())[1]','varchar(25)') AS Floor2, 
c.value('(Floor3/text())[1]','varchar(25)') AS Floor3
 FROM #ExistExample 
CROSS APPLY XMLDocument.nodes('/Buildings/Building') as t(c) 
WHERE c.value('(Name/text())[1]','varchar(25)') = @data 
AND XMLID = @ID

我不确定这是否是更好的方法，或者还有其他方法可以实现这一点。

像Where子句一样的XQuery过滤器

2 个答案: