Drools rules engine Detailed - common examples drl

package droolsDemo
// Description: Each drl must declare a package name, the package name with different Java inside, and it does not require the same hierarchy of folders,
// can be mainly used to specify which file to load .drl according to kmodule.xml different package properties,
//packages="org.some.pkg "represents ksession2 only loads the file under the rules of org.some.pkg, if I did not write, the default file to load all the rules.

// Import entity class
import com.qianxin.rulesengine.drools.User
import com.qianxin.rulesengine.drools.Pet
import com.qianxin.rulesengine.drools.Dog
import com.qianxin.rulesengine.drools.BoolTest

rule "multiple condition"
// salience larger values ​​first match
salience 1
    when
        A plurality of condition test @: user in age between 15-3060-90 and logic to handle different color pet according to the attribute of a user,
        $user : User((age>15 && age<30)||(age>60 && age<90))
        $pet : Pet() from $user.pet
        if($pet.getColor()=="black") do[black]
        // do after the end of the key, continue to follow the logic, the end of the program after the end of the break keyword
        if($pet.getColor()=="white") break[white]
    then
        System.out.print ( "end of the test");
    then [black]
        System.out.println("pet color is balck");
    then [white]
        System.out.print("pet color is white");
     end

rule "BigInteger test"
     salience 20
      when
      // BigInteger can be resolved relatively (over 64) in large numbers to support the direct use of> = == = <symbol direct comparison, very convenient
      // development can be used to solve a relatively IPv6
         $dog : Dog(age=="21262780079976241822035969236715638783")
      then
         System.out.println ( "I am equal to 21262780079976241822035969236715638783");
       end
 rule "string compare"
    salience -20
     when
     / * String of numbers is comparable * /
        $user : User((age>"15" && age<"40")||(age>"60"))
     then
         System.out.println ( "My priority is -20");
         // This rule no longer match after match other rules
         drools.halt();
      end
rule "test bool "
          salience 100
           when
           // even if value is a boolean type, so you can also compare
              $bool : BoolTest(value=="true")
           then
               System.out.println("I am true");
            end
rule "test contains and not contains"
          salience 200
           when
           // contains and not contains the contents of the collection can be tested
              $user : User(set contains "360")
           then
               System.out.println ( "test showed comprising 360");
            end

      
rule "test not in"
     salience 100
           when
           // test not in line with the age is not between 15-3060-90
              $user : User(!((age>15 && age<30)||(age>60 && age<90)))
           then
               System.out.print ( "age is not between 15-30,60-90");
            end


rule "number test"                                  
    when
        $user : User(age>15 && age<60)     
    then
        System.out.println ( "age-qualified");
end

rule "String test"                                    
    when
        $pet : Pet(name=="cat")
    then
        System.out.println ( "qualified pet name");

end

More detailed syntax, please refer to: http://www.1994july.club/seo/