给定以下 XQuery 代码生成路径并根据 MarkLogic 数据库中的数据保存文件,如果文件系统文件夹不存在,我该如何创建文件系统文件夹而不会出现异常?
for $doc in collection("http://example.com/stuff")
let $folderName := name($doc/Envelope/*[1])
let $folderPath := concat("c:temp", $folderName, "")
let $fileName := concat($doc/Envelope/*[1]/*:Code/text(), ".xml")
let $fullPath := concat($folderPath, $fileName)
(: Create the folder at $folderPath if it does not exist :)
return xdmp:save($fullPath,$doc)
AFAIK 没有"文件夹存在"功能,令人困惑的是filesystem-file-exists
实际上也适用于文件夹,所以答案是:
for $doc in collection("http://example.com/stuff")
let $folderName := name($doc/Envelope/*[1])
let $folderPath := concat("c:temp", $folderName, "")
let $fileName := concat($doc/Envelope/*[1]/*:Code/text(), ".xml")
let $fullPath := concat($folderPath, $fileName)
let $_ := if(xdmp:filesystem-file-exists($folderPath)) then () else xdmp:filesystem-directory-create($folder)
return xdmp:save($fullPath,$doc)