[英]XQuery with basex-node Database gives other results with an external variable?
[英]Xpath/Xquery on BaseX bringing back no results
試圖在BaseX中第一次使用XPath / Xquery,我在下面的carpark片段中有一個opendata.gov的集合/數據庫,
<?xml version="1.0" encoding="utf-8"?>
<CarParkDataImport xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.transportdirect.info/carparking B:/CODE/carparks/CarParking.xsd" xmlns="http://www.transportdirect.info/carparking">
<CarPark>
<CarParkRef>3</CarParkRef>
<CarParkName>Nunnery Lane</CarParkName>
<Location>York</Location>
<Address>Nunnery Lane--York--North Yorkshire</Address>
<Postcode>YO23 1AA</Postcode>
</CarPark>
我想要做的是找到位置是某個地方的位置,在這個例子中“Nunnery Lane”,然后返回停車場參考,所以我試過(db被稱為Car_park_data,里面有8個文件)
collection("Car_park_data")/CarParkDataImport/CarPark[Location="Nunnery Lane"]/CarParkRef
然后嘗試了flowr
for $x in collection("Car_park_data")/CarParkDataImport/CarPark
where $x/Location="Nunnery Lane"
order by $x/CarParkRef
return $x/CarParkRef
兩者都沒有回擊......第一個查詢的完整細節(basex的結果位)
Compiling:
- pre-evaluating fn:collection("Car_park_data")
- adding text() step
- applying text index
Query:
collection("Car_park_data")/CarParkDataImport/CarPark[Location="Nunnery Lane"]/CarParkRef
Optimized Query:
db:text("Car_park_data", "Nunnery Lane")/parent::Location/parent::CarPark[parent::CarParkDataImport/parent::docume nt-node()]/CarParkRef
Result:
- Hit(s): 0 Items
- Updated: 0 Items
- Printed: 0 Bytes
- Read Locking: local [Car_park_data]
- Write Locking: none
Timing:
- Parsing: 1.33 ms
- Compiling: 0.54 ms
- Evaluating: 0.36 ms
- Printing: 0.28 ms
- Total Time: 2.52 ms
Query plan:
<QueryPlan>
<CachedPath>
<ValueAccess data="Car_park_data" type="TEXT">
<Str value="Nunnery Lane" type="xs:string"/>
</ValueAccess>
<IterStep axis="parent" test="Location"/>
<IterStep axis="parent" test="CarPark">
<CachedPath>
<IterStep axis="parent" test="CarParkDataImport"/>
<IterStep axis="parent" test="document-node()"/>
</CachedPath>
</IterStep>
<IterStep axis="child" test="CarParkRef"/>
</CachedPath>
</QueryPlan>
我做錯了什么,正如我所說的使用basex,你可以看到它是可行的Xpat / Xquery,(即basex報告沒有錯誤)但我猜我的Xquery有問題嗎?
如果我使用BaseX為“Nunnery Lane”做“查找”,這就是回來的結果
Query:
/descendant-or-self::*[text() contains text "Nunnery Lane"]
Result:
- Hit(s): 4 Items
- Updated: 0 Items
- Printed: 601 Bytes
- Read Locking: global
- Write Locking: global
所以我然后嘗試將包含文本添加到我的查詢,相同的avale,沒有命中
感謝您的任何幫助
通過添加將命名空間考慮在內
declare default element namespace "http://www.transportdirect.info/carparking";
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.