Debug XQuery Program

Question

In the beginning, I wrote a little XQuery script that was designed to do a small task and only that. Now it came out that this XQuery script is anything but complete, and I have to fix it. The problem is, my XQuery evolved into a program, and XQuery is a Pain to debug. Something that I would need would be:

Print something to the command line to check whether the program has the correct nodes at that time.

A debugging tool that shows me the stored variables

Good question, +1. See my answer for specific recomendations and links. — Dimitre Novatchev, Jan 29 '11 at 02:35

score 5 · Accepted Answer · answered Jan 29 '11 at 02:34

Something that I would need would be:

print something to the command line to check weather the progroms has the correct nodes at that time.

Use the standard XPath 2.0 function trace().

a debugging tool that shows me the stored variables

There are varios IDEs for XQuery that come up with a Debugger. For example, have a look at oXygen.

score 3 · Answer 2 · answered Feb 06 '11 at 18:03

As Dimitre suggested, trace() is what I fall back on when nothing else works. Messy but it works.

Instead of: $foo := anyXqueryExpression

Do this: $foo := trace(anyXqueryExpression, "text")

Logs the result of executing anyXqueryExpression and adds the prefix "text".

score 1 · Answer 3 · answered Feb 04 '11 at 17:00

There are few Xml Database centric diagnostics apis. w.r.t to MarkLogic Xml Database.

Diagnostics/ TaskServer UI in the admin console.
Tabular Profile use their CQ application
xdmp:query-trace(), xdmp:trace() are api gives some idea about the Query plan.
opensource Xquery Debugger = xqdebug

are few techniques to have effective coding.

Debug XQuery Program

3 Answers3

Linked