ABAP Select data from SAP table RMGW2WU into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RMGW2WU 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 RMGW2WU. 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 RMGW2WU 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_RMGW2WU TYPE STANDARD TABLE OF RMGW2WU,
      WA_RMGW2WU TYPE RMGW2WU,
      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: <RMGW2WU> TYPE RMGW2WU.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RMGW2WU.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RMGW2WU
  INTO TABLE IT_RMGW2WU.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMGW2WU
*  INTO TABLE @DATA(IT_RMGW2WU2).
*--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_RMGW2WU INDEX 1 INTO DATA(WA_RMGW2WU2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RMGW2WU ASSIGNING <RMGW2WU>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMGW2WU>-MATNR = 1.
<RMGW2WU>-MEINS = 1.
<RMGW2WU>-STLAL = 1.
<RMGW2WU>-STLAN = 1.
<RMGW2WU>-DATUV = 1.

ENDLOOP.

LOOP AT IT_RMGW2WU INTO WA_RMGW2WU.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMGW2WU-DATUB, sy-vline,
  WA_RMGW2WU-KMPMG, sy-vline,
  WA_RMGW2WU-KMPME, sy-vline,
  WA_RMGW2WU-BMENG, sy-vline,
  WA_RMGW2WU-BMEIN, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_RMGW2WU 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_RMGW2WU 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_RMGW2WU INTO WA_RMGW2WU.


*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.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMGW2WU-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMGW2WU-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RMGW2WU-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMGW2WU-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMGW2WU-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMGW2WU-STLAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field KMPME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RMGW2WU-KMPME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMGW2WU-KMPME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RMGW2WU-BMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMGW2WU-BMEIN.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

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

TYPES: BEGIN OF T_RMGW2WU_STR, 
MATNR TYPE STRING,
MEINS TYPE STRING,
STLAL TYPE STRING,
STLAN TYPE STRING,
DATUV TYPE STRING,
DATUB TYPE STRING,
KMPMG TYPE STRING,
KMPME TYPE STRING,
BMENG TYPE STRING,
BMEIN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMGW2WU_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_RMGW2WU_STR-MATNR sy-vline 
WA_RMGW2WU_STR-MEINS sy-vline 
WA_RMGW2WU_STR-STLAL sy-vline 
WA_RMGW2WU_STR-STLAN sy-vline 
WA_RMGW2WU_STR-DATUV sy-vline 
WA_RMGW2WU_STR-DATUB sy-vline 
WA_RMGW2WU_STR-KMPMG sy-vline 
WA_RMGW2WU_STR-KMPME sy-vline 
WA_RMGW2WU_STR-BMENG sy-vline 
WA_RMGW2WU_STR-BMEIN sy-vline      INTO ld_text SEPARATED BY SPACE.

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