[英]XQuery Replace Value With Conditional Failing
我正在在XQuery
中创建节点操作的xquery替换值。
但是似乎此代码无法正常工作,因此IF-ELSE
语句总是可以执行其他操作。
这是我的代码:
declare function local:replacing($contextData as element())
as element()*
{
copy $pipeline := $contextData/Handler/Data/*
modify(
if(not(empty(data($pipeline/Payload/sample/transactionType)))) then
replace value of node $pipeline/Payload/sample/transactionType with 'XXX' else (),
if(not(empty(data($pipeline/Payload/sample/revision)))) then
replace value of node $pipeline/Payload/sample/revision with 'XXX' else ()
)
return $pipeline
};
我尝试使用此示例XML,但是当字段revision
具有价值时,结果始终不是XXX
。 (这总是转到else
语句)
let $result :=
<root>
<Handler>
<Data>
<root>
<Payload>
<sample>
<transactionType></transactionType>
<revision>123</revision>
<board>1</board>
<mission>1</mission>
<method>Manual</method>
<listOfBoard>
<board>
<type>small</type>
<amount>5054</amount>
<token>300</token>
</board>
</listOfBoard>
<pricing>300</pricing>
<playing>Wed</playing>
</sample>
</Payload>
</root>
</Data>
</Handler>
</root>
当前结果:
<root>
<Payload>
<sample>
<transactionType/>
<revision>123</revision>
<board>1</board>
<mission>1</mission>
<method>Manual</method>
<listOfBoard>
<board>
<type>small</type>
<amount>5054</amount>
<token>300</token>
</board>
</listOfBoard>
<pricing>300</pricing>
<playing>Wed</playing>
</sample>
</Payload>
</root>
预期结果
<root>
<Payload>
<sample>
<transactionType/>
<revision>XXX</revision>
<board>1</board>
<mission>1</mission>
<method>Manual</method>
<listOfBoard>
<board>
<type>small</type>
<amount>5054</amount>
<token>300</token>
</board>
</listOfBoard>
<pricing>300</pricing>
<playing>Wed</playing>
</sample>
</Payload>
</root>
有什么想法吗?
更新资料
如下面Har所建议,我将代码更改为:
if(not(empty(data($pipeline/Payload/sample/transactionType)))) then
replace value of node $pipeline/Payload/sample/transactionType with 'XXX'
else (
if(not(empty(data($pipeline/Payload/sample/revision)))) then
replace value of node $pipeline/Payload/sample/revision with 'XXX' else ()
)
但是似乎结果是一样的。 它仍然转到else()语句。 有任何想法吗?
谢谢你
问题在于, empty()
检查空序列,因此empty()
认为包含一个空字符串的序列为true
。 您可以将data()
结果传递给if
因为empty具有有效布尔值false
:
if(data($pipeline/Payload/sample/transactionType)) then
replace value of node $pipeline/Payload/sample/transactionType with 'XXX' else (),
if(data($pipeline/Payload/sample/revision)) then
replace value of node $pipeline/Payload/sample/revision with 'XXX' else ()
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