Negative Condition checking in read statement

Question

Hi,
i have table, which i have to read,  key on which i am going to read that will be determined dynamically. now i have to check the value for the key field is initial or not. i can't use a loop here as it doesn't allow me to mention where condition field dynamically.
thanks & regards,
prabhu

Answer 1

Hi use this:
DATA: BEGIN OF it OCCURS 0,     "your dynamic table
        field1 TYPE c,
        field2 TYPE c,
      END OF it.
it-field1 = '1'.
it-field2 = 'A'.
APPEND it.
it-field1 = ''.
it-field2 = 'B'.
APPEND it.
it-field1 = '2'.
it-field2 = 'C'.
APPEND it.
FIELD-SYMBOLS: <struct> TYPE ANY,
               <comp>   TYPE ANY.
LOOP AT it ASSIGNING <struct>.   "loop at your dynamic table
  ASSIGN COMPONENT 'FIELD1' OF STRUCTURE <struct> TO <comp>.   "FIELD1 is determined dynamically
  IF sy-subrc = 0 AND <comp> is not initial.  
    WRITE <comp>.   "will write out <comp> for each entry which has non initial value in <comp> (here FIELD1)
  ENDIF.
ENDLOOP.
Please note that your <lfs> must hold name 'FIELD1' inside, than you can replace it with below code
  ASSIGN COMPONENT <lfs> OF STRUCTURE <struct> TO <comp>. 
Regards
Marcin
One thing to be added here:
You can't read table comparing its key field with negative condition NE , only comparison EQ are allowed in READ TABLE statement, that's why I chose above approach.
Edited by: Marcin Pciak on May 26, 2009 4:51 PM