CODEWITHSUNDEEP
nulldroolsbusiness-rulesdrools-guvnor
Jayanth S N
Jayanth S N

Reputation: 31

How to handle NULL or NOT NULL?

I have created a rule 

rule "NullCheck_Rule1"
salience 1
dialect "mvel"
date-effective "16-Nov-2017 00:00"
no-loop  
when 
$cdr : JSONObject( $cdr.optString("name") == null)   
then
$cdr.put("Action_1" ,"SEND MAIL");end

and for not null 

rule "NullCheck_Rule1"
salience 1
dialect "mvel"
date-effective "16-Nov-2017 00:00"
no-loop  
when
$cdr : JSONObject( $cdr.optString("name") != null)   
then
$cdr.put("Action_1" , "SEND MAIL");end

and my input is something like this "{\"id\":100,\"name\":null,\"city\":\"Pune\"}"

But its not matching the conditions even if I used condition like $cdr.optString("name") IS NULL OR $cdr.optString("name") IS NOT NULL

So how to handle null and not null in drools. The version of drools which I am using is 6.5.0.Final.

Upvotes: 0

Views: 2507

Answers (1)

Dale-Wang
Dale-Wang

Reputation: 1

I imported package in drools import code block to handle NULL or NOT NULL.for examaples "import org.apache.commons.lang3.StringUtils;" package before rule block,use isBlank/isNotBlank function in rule block to handle the Null problome.

Upvotes: 0

Related Questions