How to Assign Dynamic Fields using Filed-Symbols in ABAP/4

You can create field name in run time and assign the created name in your field-symbols by statement "ASSIGN ... TO ...".

Example

DATA: name(20),
      lv_check(1).

DATA: BEGIN OF itab OCCURS 0,
       fld1(4),
       fld2(4),
      END OF itab.
FIELD-SYMBOLS .
...
...
LOOP AT itab.
  IF lv_check = ’X’.
    name = ’ITAB-FLD1’.
  ELSE.
    name = ’ITAB-FLD2’.
  ENDIF.
  ASSIGN (name) TO .
  ...
  ...
ENDLOOP.

Color in ABAP/4

Name                 Code     Color
COL_BACKGROUND        0       depends on GUI
COL_HEADING           1       grayish-blue
COL_NORMAL            2       bright gray
COL_TOTAL             3       yellow
COL_KEY               4       bluish green
COL_POSITIVE          5       green
COL_NEGATIVE          6       red
COL_GROUP             7       violet

FORMAT Options of Format Statement in ABAP/4

Option          Description
COLOR n         Specific background colors
INTENSIFIED     Intensified the background color
INVERSE         Swap background and foreground color
HOTSPOT         Effect when mouse pointer and click
INPUT           Generate input field
RESET           Reset formats. The format will be backed to default format.

System Field When Generate ABAP/4 Report (Often to use)

Field     Description
COLNO     the current column
LINNO     the current line
LINCT     Number of list lines
LINSZ     Line size of list
SROWS     Number of lines on screen
SCOLS     Number of column on screen
TITLE     Program title
PAGNO     Current page in list

How to Find the Number of Entries of Internal Table in ABAP/4

We can find out how many entries of internal table by apply statement "DESCRIBE".

Example

DATA: it_tab TYPE TABLE OF BKPF WITH HEADER LINE,
      tot_lines TYPE i.
...
...
DESCRIBE TABLE it_tab LINES tot_lines.

Or you can apply statement ’LOOP AT’ and count it.

Example

LOOP AT it_tab.
 tot_lines = tot_lines + 1.
ENDLOOP.

Operator for comparing strings in ABAP/4

Operator     Description
CO           Contains Only
CN           Contains Not Only
CA           Contains Any
NA           Contains Not Any
CS           Contains String
NS           Contains No String
CP           Matches Pattern
NP           Not Match Pattern

How to Read Table Dynamically in ABAP/4

About statement "READ TABLE", we can generate code for read key dynamic as below:

DATA: BEGIN OF itab OCCURS 0,
fld1(2),

fld2(2),

fld3(10),

fld4 TYPE i,

END OF itab,

wa_tab LIKE itab,

gv_key1(4) TYPE C VALUE ’FLD1’,

gv_key2(4) TYPE C VALUE ’FLD2’.

...

...

...

READ TABLE itab INTO wa_tab
WITH KEY (gv_key1) = ’AA’
(gv_key2) = ’BB’.