|Perl: the Markov chain saw|
Generating complex LDAP queries with Perlby grinder (Bishop)
|on Jul 17, 2009 at 10:46 UTC||Need Help??|
For the longest time, I've managed to limit my LDAP queries to the absolute minimum, (foo=bar), or heaven forfend, (| (foo=bar) (foo=rat)) (and it was only upon rereading that I realised I had left off the last closing parenthesis, which just goes to show how easy it is to get this wrong!)
Yesterday I had to write some really tangled queries to tease out a thousand or so records from a directory at $work. I ran into grief trying to keep my conditionals (and parentheses) nested, and concluded that it would be much better to a have a program generate the queries for me. Hence, given something like:
The bit in the middle says "I want all the records that are internal, or if they are external, all except some profiles".
when I run the above code, it produces the fabulous:
(& (& (& (& (& (& (& (objectClass=dynCand) (candActive=TRUE)) (dynActive=TRUE)) (| (!(candBase=EXTERNAL)) (& (candBase=EXTERNAL) (!(| (| (| (| (| (| (dynProfile=ante) (dynProfile=catp)) (dynProfile=fci)) (dynProfile=mgn)) (dynProfile=oppse)) (dynProfile=pic)) (dynProfile=ren)))))) (candDateStart<=1247827075)) (candDateEnd>=1247827075)) (dynDateStart<=1247827075)) (dynDateEnd>=1247827075))
The implementation is trivial:
I threw in the IGNORE function to remove parts of the construct. Since Perl doesn't have a multi-line comment block, and you cannot embed POD within a function call, this was the easiest way to comment out a subconditional. So, if you ever need to build hairy LDAP queries, this might be for you.
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