[rules-users] Using Advanced Enumeration Concepts in guvnor

[Michael Anstis]

All data access has to be "black boxed" inside your helper class. The
example simply sets up some static data but could equally read the data
from a database. The implementation would be entirely up to your own
imvention.

Sent on the move
On 7 Jan 2014 13:31, "abhinay_agarwal" <abhinay_agarwal at infosys.com> wrote:

> The following sentences are taking directly from the user guide:
>
> / 'Person.age' : (new com.yourco.DataHelper()).getListOfAges()
>
> This assumes you have a class called "DataHelper" which has a method
> "getListOfAges()" which returns a List of strings (and is on the
> classpath).
> You can of course mix these "dynamic" enumerations with fixed lists. You
> could for example load from a database using JDBC. The data enumerations
> are
> loaded the first time you use the guided editor in a session./
>
> Now, I would like to know how guvnor would connect to the database ?
>
> Inside the getListOfAges(), I want to hit the database and get the list of
> ages, put it inside a Map<String, List&lt;String>>.
>
> The example that is shown in the user guide is again hard coding the
> values.
>
> >From the user guide :
>
> /public class SampleDataSource2 {
>     public Map<String>, List<String> loadData() {
>        Map data = new HashMap();
>        List d = new ArrayList();
>        d.add("value1");
>       d.add("value2");
>       data.put("Fact.field", d);
>       return data;
>   }
> }/
>
>
> AFAIK, the jar of this class SampleDataSource2 will be uploaded to guvnor,
> so should I keep the connection details to database inside the same class ?
> If yes,
>
> 1. How will guvnor be able to directly connect to the database ?
> 2. Should I add the jars for database connectivity as well ?
> 3. Is keeping the connection details inside the jar, not a security threat
> ?
>
> I am not sure if I understand completely how this enumeration works, please
> feel free to guide me, if I am wrong somewhere.
>
> Regards,
> Abhinay
>
>
>
>
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