Validate date range overlapping

Question

Hello all. I am trying to write a code which checks if the date does not overlap. For example, in my form I have id, from_date (mm/dd/yyyy), to_date (mm/dd/yyyy).. what i am trying to do is, the dates must not ovelap for particular id..
Sample:
id | from_date | to_date
1 | 01/01/2012 | 01/31/2012
1 | 04/01/2012 | 04/30/2012 --> this must be allowed
2 | 01/15/2012 | 01/15/2012 --> this must also be allowed as id differs
1 | 01/15/2012 | 01/15/2012 --> this must not be allowed because for id=1, 15th Jan is overalapping with the 1st row's date range (1st Jan to 31st Jan).
PS : I dont want to use DB trigger, but rather write a code in Backing bean
(I will let you know what code i tried so far, if needed)
Edited by: 925715 on Apr 5, 2012 3:36 AM

Answer 1

Assalaam Alaikum Jabr. thankss for the reply. For some reason it doesn't seem to work. I tried to create a validation method, at Entity level and also at Attribute level in Entity class of detail table. it is committing all the dates. Any ways, i will check again, if I am missing something here. And, must the validator be created at entity or attribute level??
Edited by: 925715 on Apr 7, 2012 4:32 PM