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XQuery how to reduce the number of recursions?
Following is my XQuery query where I loop over the collection, count documents, if the count is greater than zero the document is added to the result node.
But it happens that when the the result does not contain any element, this element is added to the result node, causing the query to be again executed.
How can I prevent this from happening?
xquery version "3.0";
declare option xdmp:mapping "false";
declare variable $result := xdmp:quote("
Your problem is that you add the result of the $result/code expression to the result at the same moment you query the content of $result.
Try this instead:
for $C in db:collection("collection") return
When the variables in your XQuery expressions are mutable in this sense (i.e. changing something inside an expression which is wrapped in ), they are evaluated, and the result is stored in the "context". Thus the evaluation of your $result expression will not lead to the code part containing in your result node being empty, the query will just evaluate, and leave your node in the "context".
This explains the difference in behavior to be expected 0b46394aab