sql - 循环通过 xml 然后更新 SQL 中的 xml 变量

Question

我的 xml 看起来像 ff:

<root>
  <TemplateQuestion>
    <Row rfqID="1" rftID="1" questionDesc="Question 1" responseType="1" rfqDisplayOrder="1" deletedBit="0" />
    <Row rfqID="2" rftID="1" questionDesc="Question 2" responseType="2" rfqDisplayOrder="2" deletedBit="0" />
    <Row rfqID="3" rftID="1" questionDesc="Question 3" responseType="3" rfqDisplayOrder="3" deletedBit="0" />
  </TemplateQuestion>
</root>

现在我的目标是让 rfqID 前面有字母“q”。所以结果应该像 ff:

<root>
  <TemplateQuestion>
    <Row rfqID="q1" rftID="1" questionDesc="Question 1" responseType="1" rfqDisplayOrder="1" deletedBit="0" />
    <Row rfqID="q2" rftID="1" questionDesc="Question 2" responseType="2" rfqDisplayOrder="2" deletedBit="0" />
    <Row rfqID="q3" rftID="1" questionDesc="Question 3" responseType="3" rfqDisplayOrder="3" deletedBit="0" />
  </TemplateQuestion>
</root>

我通过这样做实现了这一目标:

    declare @xml XML
    set @xml = (select dbo.udfGetXMLVal(1))

    declare @nodeCount int
    declare @i int
    declare @qid nvarchar(20)

    set @i = 1
    select @nodeCount = @xml.value('count(/root/TemplateQuestion/Row/@rfqID)','int')
    while(@i <= @nodeCount)
    begin
    select @qid = x.value('@rfqID[1]', 'VARCHAR(20)') 
    from @xml.nodes('/root/TemplateQuestion/Row[position()=sql:variable("@i")]') e(x)
    set @qid = 'q' + @qid
    select @qid

    Set @xml.modify('replace value of (/root/TemplateQuestion/Row/@rfqID)[1] with sql:variable("@qid")')

    set @i = @i + 1 
end

我在使用这条线时遇到问题:

Set @xml.modify('replace value of (/root/TemplateQuestion/Row/@rfqID)[1] with sql:variable("@qid")')

如何将 [1] 替换为变量 @i？当我尝试使用 sql:variable 时，出现一些字符串文字错误。

如果您能提供任何帮助，我们将不胜感激。谢谢

Answer 1

"How can I replace the [1] to the variable @i? I get some error with string literals when I try to use sql:variable"

你可以这样做(在 SQL Server 2008R2 中测试和工作):

Set @xml.modify('
    replace value of ((/root/TemplateQuestion/Row/@rfqID)[sql:variable("@i")] )[1]
    with sql:variable("@qid")
')