Re: [rules-users] Writing rules using java from template
2009/3/31 Meny Kobel <meny.kobel(a)gmail.com>:
Hi,
First - Thanks for your quick response.
Second - As I wrote rules conditions are saved in DB.
Conditions table example :
TypeName Operation Value Return Value
Var1 >= 5 “Segment
1”
Var2 matches “someString” “Segment 1”
Var3 < 6 “Segment
1”
Var4 == 1 “Segment
2”
Var5 == 5 “Segment
2”
The table above should trasform to the following DRL rule -
rule "example 1"
when
Bean(var1 >= 5 ,var2 matches "someString",var3 < 6)
then
list.add("Segment 1");
End
rule "example 2"
when
Bean(var4 == 1 ,var5 == 5)
then
list.add("Segment 2");
End
The conditions are dynamically build on Site by customer and I don’t know
the number of conditions And the conditions values(the values of columns
TypeName,Operation, Value and Return Value ).
On Tue, Mar 31, 2009 at 2:35 PM, Meny Kobel <meny.kobel(a)gmail.com> wrote:
>
> Hi,
> Any updates regarding this subject?
> I have the same problem and can't find a solution.
> Like newbie I need to read varying rules from DB and transform them to
> drools language.
>
> Thanks,
> Meny
Hi,
since you seem to have a concrete idea on how your rules should look,
you can simply render them into a String according to your
specification and then pass a StringReader to
PackageBuilder.addPackageFromDrl(). The resultig package can then be
added to your rulebase.
Of course you could also use rules to generate the rules from the
conditions in the DB, which would be more complex but more extensible,
too.
HTH
Marcus