SQL Server OPENXML v XQUERY 性能

编程问答 2022-04-21

问题描述

我一直在测试 OpenXML 和 XQuery，而 OpenXML 在执行 XQuery 方面表现出色（我相信这应该与我阅读的内容相反）

我更喜欢使用 XQuery，所以我正在寻求帮助。有什么方法可以改进 Xquery？

我在一个表中有大约 10,000 个这样的 XML（并且比这个例子大得多）

 <Root>
  <Data Code="123" Ref="1">
    <Node>
      <Details Date="2021-06-28" Code="ABC" />
      <Types>
        <Type Type="3" Count="29" />
        <Type Type="5" Count="0" />       
          <TypeDetails Date2="2021-06-30" />
        </Type>
      </Types>
      <Invoice Number="1234" Version="1" />
    </Node>
  </Data>
</Root>

OpenXML 查询：

    DECLARE name_cursor CURSOR  
FOR  
   SELECT XML   
   FROM  [dbo].[table]
OPEN name_cursor  
DECLARE @xmlVal XML  
DECLARE @idoc int  
FETCH NEXT FROM name_cursor INTO @xmlVal  
  
WHILE (@@FETCH_STATUS = 0)  
BEGIN  
   EXEC sp_xml_preparedocument @idoc OUTPUT,@xmlVal  
  
 INSERT INTO finaltable 
SELECT  Code,Ref,Date,Code,Number,Version,Type,Count,Date2
FROM OPENXML(@iDoc,'Root/Data/Node/Types/Type')
WITH 
(
Code [varchar](50) '../../../@Code',Ref [varchar](50) '../../../@Ref',Date [varchar](50) '../../Details/@Date',Code [varchar](50) '../../Details/@Code',Number [varchar](50) '../../Invoice/@Number',Version [varchar](50) '../../Invoice/@Version',Type [varchar](50) '@Type',Count [varchar](50) '@Count',Date2 [varchar](50) 'TypeDetails/@Date2'

)

   EXEC sp_xml_removedocument @idoc  
   FETCH NEXT FROM name_cursor INTO @xmlVal  
END  
CLOSE name_cursor  
DEALLOCATE name_cursor

XQuery（我也为每个节点尝试了不同版本的 CROSS APPLY）：

    INSERT INTO finaltable
select 
 c.value('(../../../@Code)[1]','nvarchar(50)') as  Code,c.value('(../../../@Ref)[1]','nvarchar(50)') as  Ref,c.value('(../../Details/@Date)[1]','nvarchar(50)') as  Date,c.value('(../../Details/@Code)[1]',c.value('@Type','nvarchar(50)') as  Type,c.value('@Count','nvarchar(50)') as  Count,c.value('(TypeDetails/@Date2)[1]','nvarchar(50)') as  Date2,c.value('(../../Invoice/@Number)[1]','nvarchar(50)') as  Number,c.value('(../../Invoice/@Version)[1]','nvarchar(50)') as  Version

from [dbo].[table] 
CROSS APPLY XML.nodes('Root/Data/Node/Types/Type') as t(c)

解决方法

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