SQL Update查詢根據xml節點值更新記錄中的xml？

Question

我有一列ntext數據類型和非XML。 它存儲所有xml數據。 我需要更新記錄中的xml節點。 它拋出一個錯誤，說“錯誤使用xml數據類型方法'修改'。在此上下文中應該使用非mutator方法。”

begin transaction
declare @Cps_Id int;
set @Cps_Id = 236;
declare @Cps_Message nvarchar(1024);
set @Cps_Message = 'updating cpsia message with smoking'; 

update table_name
set column_name =  CONVERT(xml,column_name).modify('replace value of (/root/ProductInformation/CPSIA/CpsiaDetails/Item[CpsiaId=sql:variable("@Cps_Id")]/CpsiaMessage/text())[1] with sql:variable("@Cps_Message")') 
WHERE Convert(xml,column_name).exist('/root/ProductInformation/CPSIA/CpsiaDetails/Item[CpsiaId=sql:variable("@Cps_Id")]')=1 

rollback  

示例XML：

<root>
  <ProductInformation>
    <Name> Truck with Battery Charger</Name>
    <Description>Fr.</Description>
    <CPSIA>
      <CpsiaDetails>
        <Item>
          <CpsiaId>456</CpsiaId>
          <CpsiaMessage>waring</CpsiaMessage>
        </Item>
        <Item>
          <CpsiaId>236</CpsiaId>
          <CpsiaMessage>to health</CpsiaMessage>
        </Item>
      </CpsiaDetails>
    </CPSIA>
  </ProductInformation>
</root>

Answer 1

您需要對XML數據類型使用modify方法。

begin transaction
declare @Cps_Id int;
set @Cps_Id = 236;
declare @Cps_Message nvarchar(1024);
set @Cps_Message = 'updating cpsia message with smoking'; 

select id, CONVERT(xml,[text]) txt into #tmp from SO5954359

select * from #tmp

update #tmp
set txt.modify('replace value of (/root/ProductInformation/CPSIA/CpsiaDetails/Item[CpsiaId=sql:variable("@Cps_Id")]/CpsiaMessage/text())[1] with sql:variable("@Cps_Message")') 

select * from #tmp

drop table #tmp
rollback 

然后，您可以通過將更新的臨時表連接到密鑰上的原始表來更新原始表。