drools newbie wrote:

Thanks Mark.
I looked the unit tests. I'm looking for something different
I would have different rules that compares varying fields(rather fixed set
of fields) and those are all defined in the database.
Ex:
1.Rule1 conditions are f1='a' & f2='b' in db
2. Rule2 conditions are f3='c' or f4='d' in db.

how can I create rules programmatically and feed into rule engine?

If you need something more flexible, you'll either need to write your own or figure out how to extend drools-template - if you do the later, please don't forget to send in a patch.

Please provide some guidance with examples?
Thanks again.




Mark Proctor wrote:

drools newbie wrote:

Hello,
Actually I want to do the same way Sandeep has described..
1. Can someone please post some example to generate the drl from
template?

Drools 5.0, which you can see in the M2 release, has drools-templates. 
You'll need to look at the unit tests on how it works, but it's very
simple.

2.This thread is more than a 1 1/2 year old. Does drools have in-built
template concept now instead of using a template langauge such 
velocity, freemarker or stringtemplate ? if so,please pinpoint on the
topic
name.

yes drools-templates, which is built on MVEL.

Thanks


Mark Proctor wrote:

Just generate a drl from your model using a template langauge such 
velocity, freemarker or stringtemplate. you can generate and load the 
drl at runtime, this is what the decision table does. You can program 
agains the API yourself, but its quite complex, and certainly not 
recommended for a noobie.

Mark
Kolla, Sandeep wrote:

Hi Rahul,

Its not about storing the whole file into the database.

I would have a Table representing the parameteres required to 
construct a rule.

For example.

Tables:

*RuleSetTable:*
Ruleset_id
Ruleset_name

*RuleTable:*
Rule_id
Rule_name
Rule_saliance
Rule_condition
Rule_consequence
Ruleset_id

Now while loading the rules the application basically should read from 
the DB, and construct the rules, as everything required to construct 
the rules is avaliable in the tables.

This requirement had come up because as the rules keep changing quite 
frequently, we don't want to bring down the application to load a new 
DRL file.

Hope you understood what I want to achieve.

Thanks much,
Sandeep.



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