marklogic - MarkLogic Search Xquery

Question

Using following 2 MarkLogic Xqueries inorder to get expected result:

1. To list out all documents by timestamp

   for $x in xdmp:document-properties()//prop:last-modified  
   order by $x descending 
   return <uri>{xdmp:node-uri($x)} {$x}</uri>
   

2. To search string in the document from the lastest file

   for $a in doc("/contentC:/MLDemo/DataFiles/1234.xml")/*//@System_Name
   where $a ="Exchange"
   return $a
   

I am new to Marklogic and Xquery. Can someone plesae help me To combine these two individual scripts into one script.

Thanks in advance.

Answer 1

假设您没有更改默认配置，prop:last-modified应该会有所帮助。

请参阅https://docs.marklogic.com/guide/app-dev/properties以了解有关属性的更多信息。

请注意，/*//@System_Name where $a ="Exchange"对于大型数据库，这不会很好地执行。指定一个元素并使用 XPath 谓词。尝试更多类似的东西/a/b/c[@d eq $value]- 或者如果你有多个元素/a/b/(c|d|e)[@z eq $value]

Answer 2

let $URI:=<uris>{ for $x in xdmp:document-properties()//prop:last-modified
order by $x descending return <uri>{xdmp:base-uri($x)}</uri> }</uris>

for $a in $URI//uri let $doc:= doc($a)/*//@System_Name where $a ="Exchange" return $a

Answer 3

这个问题有很多答案。

我建议您学习基本的 XQuery 语法。例如，尝试http://www.amazon.com/XQuery-Priscilla-Walmsley/dp/0596006349

Answer 4

for $a in doc("/contentC:/MLDemo/DataFiles/1234.xml")/*//@System_Name
return 
if($a eq "Exchange") then
       for $x in xdmp:document-properties()//prop:last-modified  
       order by $x descending 
       return <uri>{xdmp:node-uri($x)} {$x}</uri>
else ()