Lock a ztable using function module or memory id

Question

hello experts,
i am facing a problem in ALV grid output (editable) - when user editing and saving data into the ztable - other user should not able to save the data and error msg to be displayed.
i am using the function modules for locking the whole table - enqueue_eztable and dequeue_eztable. i can see the table as locked in sm12, but i can also do the updating and save data.
is there anyother function module to work with?
another way i am doing is -
DATA: text4 TYPE c,
        text5 TYPE c.
  IMPORT text4 TO text5 FROM MEMORY ID 'Y222'.
  IF sy-subrc = 0.
    IF text5 = 'X'.
      MESSAGE e000(z1) WITH 'SOME USER IS ACCESSING THE PROGRAM'.
    ENDIF.
  ELSE.
    EXPORT text4 = 'X' TO MEMORY ID 'Y222'.
    PERFORM update_dbase.
    FREE MEMORY ID 'Y222'.
  ENDIF.
this method also not working.
plz help me, how to avoid other user accessing the data when another user is working on it?
thanks.

Answer 1

Hi,
Create lock object for the table and use below method
  Lock Table ZWMDASHBOARD
    CALL FUNCTION 'ENQUEUE_EZWMDASHBOARD'
      EXPORTING
        mode_zwmdashboard = 'E'
        mandt             = sy-mandt
      EXCEPTIONS
        foreign_lock      = 1
        system_failure    = 2
        OTHERS            = 3.
    IF sy-subrc <> 0.
      RAISE unable_to_lock.     " Exception
    ELSE.
    Modify Table ZWMDASHBOARD.
      MODIFY zwmdashboard FROM TABLE t_zwmdashboard[].
      IF sy-subrc <> 0.
      Do Nothing
      ENDIF.
    Unlock table ZWMDASHBOARD.
      CALL FUNCTION 'DEQUEUE_EZWMDASHBOARD'
        EXPORTING
          mode_zwmdashboard = 'E'
          mandt             = sy-mandt.
    ENDIF.
Hope this helps..