--A. 从存储在非类型化的 xml 变量中的文档中删除节点
DECLARE @myDoc xml
SET @myDoc = '<?Instructions for=TheWC.exe ?>
<Root>
<!-- instructions for the 1st work center -->
<Location LocationID="10" LaborHours="1.1" MachineHours=".2" >
Some text 1
<step>Manufacturing step 1 at this work center</step>
<step>Manufacturing step 2 at this work center</step>
</Location>
</Root>'
SELECT @myDoc
-- delete an attribute
SET @myDoc.modify('
delete /Root/Location/@MachineHours
')
SELECT @myDoc
-- delete an element
SET @myDoc.modify('
delete /Root/Location/step[2]
')
SELECT @myDoc
-- delete text node (in <Location>
SET @myDoc.modify('
delete /Root/Location/text()
')
SELECT @myDoc
-- delete all processing instructions
SET @myDoc.modify('
delete //processing-instruction()
')
SELECT @myDoc
--B. 从存储在非类型化的 xml 列中的文档中删除节点
delete XML DML 语句从存储在列中的文档中删除 <Features> 的第二个子元素。
CREATE TABLE #T (i int, x xml)
go
INSERT INTO #T VALUES(1,'<Root>
<ProductDescription ProductID="1" ProductName="Road Bike">
<Features>
<Warranty>1 year parts and labor</Warranty>
<Maintenance>3 year parts and labor extended maintenance is available</Maintenance>
</Features>
</ProductDescription>
</Root>')
go
-- verify the contents before delete，query返回Features元素下的所有节点,以XML格式返回
SELECT x.query('//ProductDescription/Features')
from #T
-- delete the second feature
UPDATE #T
SET x.modify('delete /Root/ProductDescription/Features/*[2]')
-- verify the deletion
SELECT x.query(' //ProductDescription/Features')
from #T
DROP TABLE #T
C. 从非类型化的 xml 列中删除节点
create table #T(ProductModelID int primary key,
Instructions xml )
go
insert #T
select ProductModelID, Instructions
from Prod
