[rules-users] MVEL expression

[Edson Tirelli]

   Although Drools makes extensive usage of MVEL, it is always embedded in
the DRL language. So, it is Drools that defines that a field constraint is
always a field accessor in the left with one or more restrictions in the
right.

   We need to find a way to make the Drools x MVEL relationship more clear
because it is not the first time this slight confusion is made.

   Anyway, docs are being updated, but take a look at the Pattern
documentation (item 7.8.2.1):

https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBuild/artifact/trunk/target/docs/drools-expert/html/ch07.html#RuleLanguage-ConditionalElements

   []s
   Edson



2009/3/17 Femke De Backere <femmyke at gmail.com>

> Thx!
>
> Do you know where I could find a tutorial of MVEL in Drools, because I
> looked at some MVEL tutorials yesterday and I didn't find the solution...
>
> 2009/3/17 Edson Tirelli <tirelli at post.com>
>
>>
>>    Left side of a constraint should always be a field name... no
>> expression allowed. Either move the expression to the right side or use
>> eval.
>>
>> Patient( sedation.ultiva > ( 0.1 - 0.02 ) )
>>
>>    Or even better:
>>
>> Patient(sedation.ultiva > 0.08)
>>
>>    []s
>>    Edson
>>
>> 2009/3/16 Femke De Backere <femmyke at gmail.com>
>>
>>> Hi,
>>>
>>> The following expression keeps returning the error [112,32]: [ERR 103]
>>> Line 112:32 no viable alternative at input '+' in rule
>>> "RuleFlow-Split-masterproef.ruleflows.shortsedation-18-22" in pattern
>>> Patient:
>>> Patient(sedation.ultiva+0.02 > 0.1)
>>> with sedation.ultiva returning a double
>>> What am I doing wrong?
>>> Thx,
>>> Femke
>>>
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>>>
>>
>>
>> --
>>  Edson Tirelli
>>  JBoss Drools Core Development
>>  JBoss, a division of Red Hat @ www.jboss.com
>>
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>>
>
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-- 
 Edson Tirelli
 JBoss Drools Core Development
 JBoss, a division of Red Hat @ www.jboss.com
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