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我的数据库中有一个名为 User 的表。其中有一个名为 XmlText 的 xml 列，其中包含许多属性。

  <userDetails>
  <MobileVerified>True</MobileVerified>
  <EmailVerified>True</EmailVerified>
  <IPAddress>122.160.65.232</IPAddress>
  <Gender>Male</Gender>
  <DateOfBirth>1970-03-22T00:00:00</DateOfBirth>
  <DealingInProperties>residential_apartment_flat</DealingInProperties>
  <DealingInProperties>residential_villa_bungalow</DealingInProperties>
  <DealingInProperties>residential_farm_house</DealingInProperties>
</userDetails>

需要做的是，如果 XmlText 列中存在“residential_apartment_flat”，则我必须将所有“residential_villa_bungalow”值合并到“residential_apartment_flat”，否则默认情况下将保留“residential_apartment_flat”。数据库中有大约 700000 条记录，因此请注意在正常更新与当前更新之间可以使用什么技术。

使用以下列“UserID，XmlText”触发查询

可能的逻辑是这样的..

if ('residential_villa_bungalow') exists
(
if ('residential_apartment_flat') exists
    remove the 'residential_villa_bungalow' node as there must be only one 'residential_apartment_flat' node
else
    update 'residential_villa_bungalow' into 'residential_apartment_flat'
)
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1 回答 1

1

XML 数据修改语言 (XML DML)

-- Delete bungalow where already exist a flat
update YourTable
set    XMLText.modify('delete /userDetails/DealingInProperties[. = "residential_villa_bungalow"] ')
where  XMLText.exist('/userDetails[DealingInProperties = "residential_apartment_flat"]') = 1 and
       XMLText.exist('/userDetails[DealingInProperties = "residential_villa_bungalow"]') = 1

-- Change value from bungalow to flat
update YourTable 
set    XMLText.modify('replace value of (/userDetails/DealingInProperties[. = "residential_villa_bungalow"]/text())[1] 
                       with "residential_apartment_flat"')
where  XMLText.exist('/userDetails[DealingInProperties = "residential_villa_bungalow"]') = 1
于 2012-09-21T06:42:52.887 回答