ABAP Select data from SAP table /PM0/3FJ_MOD_MAIN into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /PM0/3FJ_MOD_MAIN table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to /PM0/3FJ_MOD_MAIN. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the /PM0/3FJ_MOD_MAIN table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_/PM0/3FJ_MOD_MAIN TYPE STANDARD TABLE OF /PM0/3FJ_MOD_MAIN,
      WA_/PM0/3FJ_MOD_MAIN TYPE /PM0/3FJ_MOD_MAIN,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: </PM0/3FJ_MOD_MAIN> TYPE /PM0/3FJ_MOD_MAIN.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/PM0/3FJ_MOD_MAIN.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /PM0/3FJ_MOD_MAIN
  INTO TABLE IT_/PM0/3FJ_MOD_MAIN.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /PM0/3FJ_MOD_MAIN
*  INTO TABLE @DATA(IT_/PM0/3FJ_MOD_MAIN2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_/PM0/3FJ_MOD_MAIN INDEX 1 INTO DATA(WA_/PM0/3FJ_MOD_MAIN2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/PM0/3FJ_MOD_MAIN ASSIGNING </PM0/3FJ_MOD_MAIN>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</PM0/3FJ_MOD_MAIN>-EXCLUDE = 1.
</PM0/3FJ_MOD_MAIN>-MSG1 = 1.
</PM0/3FJ_MOD_MAIN>-MSG2 = 1.
</PM0/3FJ_MOD_MAIN>-MSG3 = 1.
</PM0/3FJ_MOD_MAIN>-MSG4 = 1.

ENDLOOP.

LOOP AT IT_/PM0/3FJ_MOD_MAIN INTO WA_/PM0/3FJ_MOD_MAIN.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/PM0/3FJ_MOD_MAIN-MSG1S, sy-vline,
  WA_/PM0/3FJ_MOD_MAIN-MSG2S, sy-vline,
  WA_/PM0/3FJ_MOD_MAIN-MSG3S, sy-vline,
  WA_/PM0/3FJ_MOD_MAIN-MSG4S, sy-vline,
  WA_/PM0/3FJ_MOD_MAIN-MAXLEN, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_/PM0/3FJ_MOD_MAIN you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_/PM0/3FJ_MOD_MAIN TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_/PM0/3FJ_MOD_MAIN INTO WA_/PM0/3FJ_MOD_MAIN.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/PM0/3FJ_MOD_MAIN_STR, 
EXCLUDE TYPE STRING,
MSG1 TYPE STRING,
MSG2 TYPE STRING,
MSG3 TYPE STRING,
MSG4 TYPE STRING,
MSG1S TYPE STRING,
MSG2S TYPE STRING,
MSG3S TYPE STRING,
MSG4S TYPE STRING,
MAXLEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/PM0/3FJ_MOD_MAIN_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_/PM0/3FJ_MOD_MAIN_STR-EXCLUDE sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MSG1 sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MSG2 sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MSG3 sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MSG4 sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MSG1S sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MSG2S sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MSG3S sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MSG4S sy-vline 
WA_/PM0/3FJ_MOD_MAIN_STR-MAXLEN sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.