[rules-users] Drools ruturn multiple results based on child objects data length

[Mohamed Riyaz]

Thanks Vikrant.

I have one more qurey on 'OR' logical operator for the following scenario:

I want the the boolen result from parent object which satisfies two
different condition sets with child objects. I made the rule which is
generated duplicated

results if both conditions are satisfied.

rule "test"
when
order: Order

(

   exists ( condition-1 with child objects)

   or

   exists (condition-2 with child objects)

)

then

    SOP("order id "+order.getId());

result :

     order id 1000

     order id 1000



return the results in twice if both the conditions (cond-1 & cond-2) are
satisfied. It just combine
both results and behaves like 'union all' instead of 'union' function.

Can you help on this?


regards,riyaz

On 9/8/08, Vikrant Yagnick <VikrantY at mastek.com> wrote:
>
>  My feeling after reading this post is that you need to execute a rule, if
> some child object exists.
>
> I suggest using the Exists Feature in Drools for doing something like that.
>
>
>
> It would be the same thing if you are writing SQL. If you join a Master
> Table with child tables you will get as many records as there are child
> records for each master record.
>
>
>
> However, if you only want one master record if there are child record, you
> would need to use the exists statement.
>
>
>
> Example:
>
>
>
> rule "Multiple results set"
> when
>
>     order: Order
>     exists ( Invoice from order.invoices)
>
>   then
>
>     System.out.println("Rule Example (Multiple results
> set)"+order.getId());
> end;
>
>
>
>
>
> Cheers,
>
> Vikrant
>
>
>
> *From:* rules-users-bounces at lists.jboss.org [mailto:
> rules-users-bounces at lists.jboss.org] *On Behalf Of *Mohamed Riyaz
> *Sent:* Monday, September 08, 2008 12:05 PM
> *To:* rules-users at lists.jboss.org
> *Subject:* [rules-users] Drools ruturn multiple results based on child
> objects data length
>
>
>
>
>
> Hi,
>
>
>
> In one-to-many relationship object type, Drools generate multiple results
> based on child objects data length. ie. No of child records
> belongs to parent object. I wanted the RHS part should be executed only if
> conditions imposed
> on child object satisfies.
>
> I have two facts with 1-* relationship defined in object mapping.
>
> class Invoice{}
>
> class Order{
>
> private Set<Invoice> invoices;
>
> }
>
> *I wanted RHS should be executed with only one result  irrespective of
> child records length.*
>
> rule "Multiple results set"
> when
>
>     order: Order()
>     invoice : Invoice() from order.invoices
>
>
>   then
>
>     System.out.println("Rule Example (Multiple results
> set)"+order.getId());
> end;
>
> Result:
>  Rule Example (Multiple results set)1000
>  Rule Example (Multiple results set)1000
>
>
> Please help me in resolving this issue.
>
> Regards,
> Riyaz
>
>
>
>
>
>
>
> MASTEK LTD.
> Mastek in NASSCOM's 'India Top 20' Software Service Exporters List.
> In the US, we're called MAJESCOMASTEK
>
>
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