How to approach/ handle Db triggers error messages

Question

hi folks,
-jdev 11.1.1.5.0 - adfbc
i had a dbtable. which holds some dbtriggers
AFTER INSERT OR UPDATE ON sometable FOR EACH ROW
RAISE_APPLICATION_ERROR(-20942, 'Message id');when it vialotes the condition means this raise app error will thrown.
ok fine.
while coming to adf, At the time commiting records this trigger will fires. why it firing am vialoting the trigger. so firing..
you are vialoting the trigger :
some x,y trigger throw some raw db information.
so my need is how do i give understandable message to user.
thanks.

Answer 1

thanks sudip.
as you said i read out. and make it out.
but..
say as eg:
RAISE_APPLICATION_ERROR(-20942, 'MyError');what we are doing never we hard code the value,
insist of that we store error number and error description in a table using function we will retrieve that.
RAISE_APPLICATION_ERROR(-20942, 'some Application module id'); says as some Application module id as HRM,CRM
RAISE_APPLICATION_ERROR(-20942, 'HRM'); i guess that,you get me where am?
as per your post i followed i extract the Ora number and Application module id
s = message.substring(0, ind);
s1 = message.substring(4, 8);       it will stores s1 = 20942
s2 = message.substring(9, 14;       it will stores s2 = HRM
i would like to call a function here
func_some_name( s1 , s2);
the function will  return some value(error decription) it will pass to message.
return message. by the normal way. a1.jspx - a1.java. if i want to show function returned value in a1.jspx means i will call function from the bean. function will defined in AM, exposed through client interface.
Important thing is : AM function is Bounded with Jspx page with the help of Binding Layer(a1.pagedef).
ok fine.
here my scenario is:
if i define the function in AM and i exposed means. how would i call in this Errorhandler.java file ?. if am calling means it will throw NPE.
why it is throwing npe
Errorhandler.java is indepedent file it's associated Databinding.cpx
so my need : how would i call this function in Errorhandler.java.