ABAP Select data from SAP table RMMKOP01 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RMMKOP01 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 RMMKOP01. 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 RMMKOP01 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_RMMKOP01 TYPE STANDARD TABLE OF RMMKOP01,
      WA_RMMKOP01 TYPE RMMKOP01,
      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: <RMMKOP01> TYPE RMMKOP01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RMMKOP01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RMMKOP01
  INTO TABLE IT_RMMKOP01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMMKOP01
*  INTO TABLE @DATA(IT_RMMKOP012).
*--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_RMMKOP01 INDEX 1 INTO DATA(WA_RMMKOP012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RMMKOP01 ASSIGNING <RMMKOP01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMMKOP01>-DAT1 = 1.
<RMMKOP01>-DAT2 = 1.
<RMMKOP01>-DAT3 = 1.
<RMMKOP01>-F02 = 1.
<RMMKOP01>-F03 = 1.

ENDLOOP.

LOOP AT IT_RMMKOP01 INTO WA_RMMKOP01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMMKOP01-F04, sy-vline,
  WA_RMMKOP01-F05, sy-vline,
  WA_RMMKOP01-F06, sy-vline,
  WA_RMMKOP01-F07, sy-vline,
  WA_RMMKOP01-F08, sy-vline,
  WA_RMMKOP01-F09, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMMKOP01 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_RMMKOP01 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_RMMKOP01 INTO WA_RMMKOP01.


*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_RMMKOP01_STR, 
DAT1 TYPE STRING,
DAT2 TYPE STRING,
DAT3 TYPE STRING,
F02 TYPE STRING,
F03 TYPE STRING,
F04 TYPE STRING,
F05 TYPE STRING,
F06 TYPE STRING,
F07 TYPE STRING,
F08 TYPE STRING,
F09 TYPE STRING,
F10 TYPE STRING,
OFFS TYPE STRING,
LEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMMKOP01_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_RMMKOP01_STR-DAT1 sy-vline 
WA_RMMKOP01_STR-DAT2 sy-vline 
WA_RMMKOP01_STR-DAT3 sy-vline 
WA_RMMKOP01_STR-F02 sy-vline 
WA_RMMKOP01_STR-F03 sy-vline 
WA_RMMKOP01_STR-F04 sy-vline 
WA_RMMKOP01_STR-F05 sy-vline 
WA_RMMKOP01_STR-F06 sy-vline 
WA_RMMKOP01_STR-F07 sy-vline 
WA_RMMKOP01_STR-F08 sy-vline 
WA_RMMKOP01_STR-F09 sy-vline 
WA_RMMKOP01_STR-F10 sy-vline 
WA_RMMKOP01_STR-OFFS sy-vline 
WA_RMMKOP01_STR-LEN sy-vline      INTO ld_text SEPARATED BY SPACE.

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