How Can I Make Oracle Query Sort Order Dynamic?

Question

I have a Oracle procedure inside a package like this

PROCEDURE getEmployee
(
  pinLanguage               IN    VARCHAR2,
  pinPage                   IN    NUMBER         


        

Answer 1

You can use separate order by for asc and desc as following:

ORDER BY 
CASE pinSortOrder WHEN 'asc' THEN
    CASE pinSortColumn 
      WHEN 'FullName' THEN FULL_NAME 
      WHEN 'DateOfBirth' THEN to_char(DATE_OF_BIRTH,'yyyymmddhh24miss')
      WHEN 'Gender' THEN GEN_TR.GENDER   
    END
END,
CASE pinSortOrder WHEN 'desc' THEN
    CASE pinSortColumn 
      WHEN 'FullName' THEN FULL_NAME 
      WHEN 'DateOfBirth' THEN to_char(DATE_OF_BIRTH,'yyyymmddhh24miss')
      WHEN 'Gender' THEN GEN_TR.GENDER   
    END
END DESC

Let's say you have passed pinSortColumn as FullName and pinSortOrder as asc then order by clause will be ORDER BY FULL_NAME, NULL DESC (please note that default order will be asc so I have not write it in the code. Query will be ordered by FULL_NAME in ascending manner)

Now, If you have passed pinSortColumn as FullName and pinSortOrder as desc then order by clause will be ORDER BY NULL, FULL_NAME DESC.

Null will not impact ordering.

I hope it is clear now.

Cheers!!