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I am trying to update a node of in my XML which is stored in a SQL Server XML column, the line below works if my XML is in a XML element but now I somehow need to change it to XML attributes, apparently the line becomes invalid after the change.

Works for XMLElement:

UPDATE  [Customers] 
SET  voucherXML.modify('replace value of (/ArrayOfCampaignVoucher/CampaignVoucher/Qty/text())[1] with "50"') 
WHERE  voucherXML.value('(/ArrayOfCampaignVoucher/CampaignVoucher/VouCode)[1]', 'nvarchar(50)') = @VoucherCode

I tried changing the statement like this but no luck, no errors but QTY values doesn't get change to the value of @NewQuantity:

UPDATE [Customers]  
       SET voucherXML='<ArrayOfCampaignVoucher xmlns:xsd="http://www.w3.org/2001/XMLSchema" Qty="' + CAST(@NewQuantity AS NVARCHAR(16)) + '" />'  
   WHERE voucherXML.value('(/CampaignVoucher/VouCode)[1]', 'nvarchar(50)') = @VoucherCode

This is how my XML looks in the SQL Server XML column:

<ArrayOfCampaignVoucher xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <CampaignVoucher VouCode="Vouc001" Qty="16" />
  <CampaignVoucher VouCode="Vouc002" Qty="18" />
  <CampaignVoucher xsi:nil="true" />
</ArrayOfCampaignVoucher>
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1 回答 1

8

您应该使用 XQuery 函数 - 不要像这样将您的 XML 串在一起......

试试这个：

DECLARE @newquantity INT = 55

UPDATE dbo.Customers
SET voucherXML.modify('replace value of (/ArrayOfCampaignVoucher/CampaignVoucher[@VouCode="Vouc002"]/@Qty)[1] with sql:variable("@NewQuantity") ')

这对我有用 -Qty节点的属性VouCode="Vouc002"更新为我之前在 SQL 变量中定义的值

更新：要插入新<CampaignVoucher>条目，请使用 XQuery，如下所示：

UPDATE dbo.Customers
SET voucherXML.modify('insert <CampaignVoucher VouCode="Vouc003" Qty="42" /> 
                       as last into (/ArrayOfCampaignVoucher)[1]')
于 2011-10-23T14:25:30.367 回答