How to execute the conditions Sequentially in MarkLogic? - xquery

Question

I am having a requirement where i need to check certain conditions and after all conditions got checked- I need to insert the document in Database-2 with FLAG value as "True".
The code is as below-
for $i in cts:search(doc(),cts:collection-query(("MyCollection")))
return
let $condition_1 := if{...} then <Flag>FALSE</Flag> else ()
let $condition_2 := if{...} then <Flag>FALSE</Flag> else ()
let $condition_3 := if{...} then <Flag>FALSE</Flag> else ()
let $condition_4 := if{...} then <Flag>FALSE</Flag> else ()
Once i will execute all the conditions then these conditions will alter my FLAG node from "True" to "False" as shown in the above code.
At last i need to check which ever document is having <Flag>True</Flag> i need to insert only those document to Database-2.
I am running this code from Database-1.
Any Suggestions ?

Answer 1

You can also use XQuery's quantified expressions in cases like this:
for $i in cts:search(doc(), cts:collection-query(("MyCollection")))
where every $check in (
(...),
(...)
) satisfies $check
return xdmp:invoke-function(etc)
Where ... still represents an expression that returns a boolean. Instead of every, you might want not(some $check in (..., ...) satisfies $check).

Answer 2

I typically find it's easiest to do this type of stacked condition checking where all conditions must be true in XQuery with this technique using a map:
let $conditionMap = map:map();
let $_ := map:put($conditionMap, "check", fn:false())
let $condition_1 := if{...} then () else map:put($conditionMap, "check", fn:true())
let $condition_2 := if{...} then () else map:put($conditionMap, "check", fn:true())
let $condition_3 := if{...} then () else map:put($conditionMap, "check", fn:true())
let $condition_4 := if{...} then () else map:put($conditionMap, "check", fn:true())
let $flag := <Flag>{if(map:get($conditionMap, "check") eq fn:false()) then "FALSE" else "TRUE"}</Flag>
let $documentInsert := ...
An alternative technique (I find more efficient but less readable) is:
let $flag :=
if($condition_1) then
if($condition_2) then
if($condition_3) then
if($condition_4) then <Flag>TRUE</flag>
else <Flag>FALSE</flag>
else <Flag>FALSE</flag>
else <Flag>FALSE</flag>
else <Flag>FALSE</flag>
let $documentInsert := ...
You can probably put the documentInsert piece together from your other question.

Answer 3

If you have conditions that evaluate to boolean, then just evaluate the boolean result of all of those conditions, convert that to a string, and then use fn:upper-case() to get it's upper-case value:
for $i in cts:search(doc(), cts:collection-query(("MyCollection")))
let $condition_1 := {...}
let $condition_2 := {...}
let $condition_3 := {...}
let $condition_4 := {...}
return
<Flag>{
fn:upper-case(fn:string( ($condition_1 and $condition_2 and $condition_3 and $condition_4))
}</Flag>