1:51 p.m.
Hi,
I am trying to use the From keyword when writing rule and i am getting
following error:
mismatched input 'from' in rule
parser returned a null package
here is my use case, i am getting a user and i calling a database to get
some number associated with this user
Does anyone know why i am getting this error?
thank you in advance
Isha
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2:02 p.m.
On 26/07/2013, IPatel <ishita.patel(a)usbank.com> wrote:
Hi,
I am trying to use the From keyword when writing rule and i am getting
following error:
mismatched input 'from' in rule
parser returned a null package
here is my use case, i am getting a user and i calling a database to get
some number associated with this user
Does anyone know why i am getting this error?
Yes: you have made a syntax error.
-W
thank you in advance
Isha
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3:18 p.m.
Thank you for your replay... here is what i am using
package POC2013
dialect "mvel"
import com.usbank.tmup.rules.value.Database
import com.usbank.tmup.rules.value.TestValue
import com.usbank.tmup.rules.value.DatabaseConnection
rule "getting user"
when
$value: TestValue()
record : POC_CombineString($value.getField1(),$value.getField2())
val : TestValue() from Database.connect().getUserRisk(record);
then
System.out.println("The value of the score is" + val);
end
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1:11 a.m.
There is no reason why this should not compile.
I suspect that you have not posted the *accurate* text of the rule
where that error occurred. Does the snippet you've mailed
cause the same error?
-W
On 26/07/2013, IPatel <ishita.patel(a)usbank.com> wrote:
Thank you for your replay... here is what i am using
package POC2013
dialect "mvel"
import com.usbank.tmup.rules.value.Database
import com.usbank.tmup.rules.value.TestValue
import com.usbank.tmup.rules.value.DatabaseConnection
rule "getting user"
when
$value: TestValue()
record : POC_CombineString($value.getField1(),$value.getField2())
val : TestValue() from Database.connect().getUserRisk(record);
then
System.out.println("The value of the score is" + val);
end
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4:34 a.m.
I guess it depends on whether there is a static connect() method on the Database class
which returns a DatabaseConnection, which in turn has a method
getUserRisk(POC_CombineString), which returns an instance of the TestValue class.
On a side note, it's a very bad idea to put database calls in the LHS of your rules.
It invariably plays hell with performance. Although potentially it gives people like me a
job re-writing slow applications, as I was doing last year, so not everyone loses out. ;)
Steve
On 27 Jul 2013, at 07:11, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
There is no reason why this should not compile.
I suspect that you have not posted the *accurate* text of the rule
where that error occurred. Does the snippet you've mailed
cause the same error?
-W
On 26/07/2013, IPatel <ishita.patel(a)usbank.com> wrote:
> Thank you for your replay... here is what i am using
> package POC2013
> dialect "mvel"
> import com.usbank.tmup.rules.value.Database
> import com.usbank.tmup.rules.value.TestValue
> import com.usbank.tmup.rules.value.DatabaseConnection
>
> rule "getting user"
>
> when
> $value: TestValue()
> record : POC_CombineString($value.getField1(),$value.getField2())
> val : TestValue() from Database.connect().getUserRisk(record);
> then
> System.out.println("The value of the score is" + val);
> end
>
>
>
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> View this message in context:
>
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> rules-users(a)lists.jboss.org
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5:09 a.m.
On 27/07/2013, Stephen Masters <stephen.masters(a)me.com> wrote:
I guess it depends on whether there is a static connect() method on
the
Database class which returns a DatabaseConnection, which in turn has a
method getUserRisk(POC_CombineString), which returns an instance of the
TestValue class.
All three possibilities should result in an error such as:
unable to resolve method using strict-mode: ....Database.connect()]
-W
7:17 a.m.
Ah … spotted the specific exception by going back to Nabble. I was just looking for
reasons why it might not compile. :)
To be honest the line:
record : POC_CombineString($value.getField1(),$value.getField2())
… looks wrong. I can't work out a way in which it could compile, even if I assume that
the code is missing imports of either a POC_CombineString function or class. However,
again, it wouldn't give the specific "mismatched input 'from'"
exception claimed.
On 27 Jul 2013, at 07:11, Wolfgang Laun <wolfgang.laun(a)gmail.com> wrote:
> record : POC_CombineString($value.getField1(),$value.getField2())
3:02 p.m.
On 27/07/2013, Stephen Masters <stephen.masters(a)me.com> wrote:
Ah … spotted the specific exception by going back to Nabble. I was
just
looking for reasons why it might not compile. :)
To be honest the line:
> record : POC_CombineString($value.getField1(),$value.getField2())
… looks wrong. I can't work out a way in which it could compile, even if I
assume that the code is missing imports of either a POC_CombineString
function or class.
If both methods return a boolean...? Any boolean expression is a valid
constraint. It does look strange, though.
-W
7:23 a.m.
By the way,
what is POC_CombineString supposed to be?
A pattern or a function call?
Davide
p.s. which version are you using?
On 07/26/2013 10:18 PM, IPatel wrote:
Thank you for your replay... here is what i am using
package POC2013
dialect "mvel"
import com.usbank.tmup.rules.value.Database
import com.usbank.tmup.rules.value.TestValue
import com.usbank.tmup.rules.value.DatabaseConnection
rule "getting user"
when
$value: TestValue()
record : POC_CombineString($value.getField1(),$value.getField2())
val : TestValue() from Database.connect().getUserRisk(record);
then
System.out.println("The value of the score is" + val);
end
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8:49 a.m.
Thank you everyone for your response.
I am using Guvnor 5.5.0.
The combine string method will take 2 strings as an arguments and
concatinate in the following pattern
String1@string2. This string will be the output of the method. I am really
not sure why it is asking for Boolean. Also this method is written inside
Guvnor using Function asset.
Thank you,
Isha
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10:15 a.m.
There you are: you cannot use a method call such as
POC_CombineString($value.getField1(),$value.getField2())
as a pattern on the LHS. This is absolutely basic.
-W
On 29 July 2013 15:49, IPatel <ishita.patel(a)usbank.com> wrote:
Thank you everyone for your response.
I am using Guvnor 5.5.0.
The combine string method will take 2 strings as an arguments and
concatinate in the following pattern
String1@string2. This string will be the output of the method. I am really
not sure why it is asking for Boolean. Also this method is written inside
Guvnor using Function asset.
Thank you,
Isha
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http://drools.46999.n3.nabble.com/using-From-keyword-in-the-rule-tp402516...
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10 comments
4 participants
participants (4)
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Davide Sottara -
IPatel -
Stephen Masters -
Wolfgang Laun