I am trying to write a for loop as:
for $conditions in $contents
return fn:concat("The value of contents is : ", $conditions)
However in place of pages its returning the values inside the $contents
variable.
I am working on a mapping file in marklogic and trying to get the values of the elements from that mapping file.
"contents": {
"sample": {
"feature": ".........",
"contents": "value1",
"contents": {..................}
now I want to loop for the "contents" element from the mapping file but my for loop is returning me the whole "contents" map instead of giving output as: "The value of contents is: value1" Can anyone help in this regard?
Your question is not very clear, as mentioned by others as well, but let me hazard a guess. You sometimes want to count items. You can do that with something as simple as fn:count($books)
.
In other cases you might want to keep track at which item number you are currently. In other programming languages you might write a for-loop which increments a variable with i = i + 1
. You can't do that in XQuery, since it is a functional language, and those typically do not allow this.
There are ways around in MarkLogic, but there is a simple trick. The FLWOR statement can keep track of the current position for you using the at
keyword.
You use it like this:
for $item at $page in $books
return fn:concat("This is the page number... ", $page)
HTH!
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