[rules-users] MVEL expression

[Femke De Backere]

Another question ;),

Can I perform a cast in MVEL? eg. Patient((ShortSedation)  
sedation.sedation24 == false)

Thx

Op 17-mrt-09, om 19:27 heeft Edson Tirelli het volgende geschreven:

>
>    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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>
>
>
> -- 
>  Edson Tirelli
>  JBoss Drools Core Development
>  JBoss, a division of Red Hat @ www.jboss.com
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