RESTful Service Search Parameters

Question

Hello,
I am using APEX 4.2.2 .. with Listener 2.0.3
I want to expose  data in EMP table as RESTful Service with parameters:
The source is:
Source Type :SQL query .
Format: JSON
select * from emp where
(:job IS NULL OR job = :job)
and
(:ename is null or ename = :ename)
URI Template:
employeesfeed/{job}/{ename}
If I use this URL, it works fine...
http://oraclesrv/real_estate/property/hr/employeesfeed/MANAGER/BLAKE
and it gives:
{"next":{"$ref":"http://oraclesrv/real_estate/property/hr/employeesfeed/MANAGER/BLAKE?page=1"},"items":[{"empno":7698,"ename":"BLAKE","job":"MANAGER","mgr":7839,"hiredate":"1981-04-30T20:00:00Z","sal":2850,"deptno":30}]}
But, as you may notice from the Source logic, the "end user" should be able to retrieve all MANAGERS using this Link.
http://oraclesrv/real_estate/property/hr/employeesfeed/MANAGER/null
But, it gives:
{"items":[]}
So, How can I retrieve all Managers ?? ( using that Source ).
Regards,

Answer 1

The the four letters (n,u,l and l) at the end of your URL happen to be a string of length 4.
Basically, you doing this comparison:
'null' is null (which is false)
If you want to keep that syntax, add
or upper(:job) = 'NULL'
MK