ABAP Select data from SAP table RMCP3 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RMCP3 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 RMCP3. 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 RMCP3 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_RMCP3 TYPE STANDARD TABLE OF RMCP3,
      WA_RMCP3 TYPE RMCP3,
      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: <RMCP3> TYPE RMCP3.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RMCP3.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RMCP3
  INTO TABLE IT_RMCP3.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMCP3
*  INTO TABLE @DATA(IT_RMCP32).
*--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_RMCP3 INDEX 1 INTO DATA(WA_RMCP32).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RMCP3 ASSIGNING <RMCP3>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMCP3>-PRGRP = 1.
<RMCP3>-PGKTX = 1.
<RMCP3>-WERKS = 1.
<RMCP3>-NAME1 = 1.
<RMCP3>-OMIPG = 1.

ENDLOOP.

LOOP AT IT_RMCP3 INTO WA_RMCP3.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMCP3-OMIMA, sy-vline,
  WA_RMCP3-MEINS, sy-vline,
  WA_RMCP3-NRMIT, sy-vline,
  WA_RMCP3-WEMIT, sy-vline,
  WA_RMCP3-TXMIT, sy-vline,
  WA_RMCP3-MEMIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMCP3 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_RMCP3 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_RMCP3 INTO WA_RMCP3.


*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 PRGRP
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMCP3-PRGRP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCP3-PRGRP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RMCP3-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCP3-MEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field NRMIT
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMCP3-NRMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCP3-NRMIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEMIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RMCP3-MEMIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCP3-MEMIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RMCP3-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCP3-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field APRGR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMCP3-APRGR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCP3-APRGR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field HPRGR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RMCP3-HPRGR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCP3-HPRGR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field HMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RMCP3-HMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMCP3-HMEIN.
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_RMCP3_STR, 
PRGRP TYPE STRING,
PGKTX TYPE STRING,
WERKS TYPE STRING,
NAME1 TYPE STRING,
OMIPG TYPE STRING,
OMIMA TYPE STRING,
MEINS TYPE STRING,
NRMIT TYPE STRING,
WEMIT TYPE STRING,
TXMIT TYPE STRING,
MEMIT TYPE STRING,
UMREF TYPE STRING,
PRKOF TYPE STRING,
ANTEI TYPE STRING,
MTART TYPE STRING,
AZEIL TYPE STRING,
BZEIL TYPE STRING,
TYP_A TYPE STRING,
TYP_D TYPE STRING,
VSNDA TYPE STRING,
OVSND TYPE STRING,
ODISP TYPE STRING,
JA_0220 TYPE STRING,
NEIN_0220 TYPE STRING,
AWAHL TYPE STRING,
DISPO TYPE STRING,
PERIV TYPE STRING,
PERKZ TYPE STRING,
COPAM TYPE STRING,
SPRAS TYPE STRING,
MAKTX TYPE STRING,
O_AUS TYPE STRING,
APRGR TYPE STRING,
APGKT TYPE STRING,
AWERK TYPE STRING,
FEVOR TYPE STRING,
FHORI TYPE STRING,
XKTEXT TYPE STRING,
XMATER TYPE STRING,
PLEBENE TYPE STRING,
ANZEB TYPE STRING,
HPRGR TYPE STRING,
HWERK TYPE STRING,
HMEIN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMCP3_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_RMCP3_STR-PRGRP sy-vline 
WA_RMCP3_STR-PGKTX sy-vline 
WA_RMCP3_STR-WERKS sy-vline 
WA_RMCP3_STR-NAME1 sy-vline 
WA_RMCP3_STR-OMIPG sy-vline 
WA_RMCP3_STR-OMIMA sy-vline 
WA_RMCP3_STR-MEINS sy-vline 
WA_RMCP3_STR-NRMIT sy-vline 
WA_RMCP3_STR-WEMIT sy-vline 
WA_RMCP3_STR-TXMIT sy-vline 
WA_RMCP3_STR-MEMIT sy-vline 
WA_RMCP3_STR-UMREF sy-vline 
WA_RMCP3_STR-PRKOF sy-vline 
WA_RMCP3_STR-ANTEI sy-vline 
WA_RMCP3_STR-MTART sy-vline 
WA_RMCP3_STR-AZEIL sy-vline 
WA_RMCP3_STR-BZEIL sy-vline 
WA_RMCP3_STR-TYP_A sy-vline 
WA_RMCP3_STR-TYP_D sy-vline 
WA_RMCP3_STR-VSNDA sy-vline 
WA_RMCP3_STR-OVSND sy-vline 
WA_RMCP3_STR-ODISP sy-vline 
WA_RMCP3_STR-JA_0220 sy-vline 
WA_RMCP3_STR-NEIN_0220 sy-vline 
WA_RMCP3_STR-AWAHL sy-vline 
WA_RMCP3_STR-DISPO sy-vline 
WA_RMCP3_STR-PERIV sy-vline 
WA_RMCP3_STR-PERKZ sy-vline 
WA_RMCP3_STR-COPAM sy-vline 
WA_RMCP3_STR-SPRAS sy-vline 
WA_RMCP3_STR-MAKTX sy-vline 
WA_RMCP3_STR-O_AUS sy-vline 
WA_RMCP3_STR-APRGR sy-vline 
WA_RMCP3_STR-APGKT sy-vline 
WA_RMCP3_STR-AWERK sy-vline 
WA_RMCP3_STR-FEVOR sy-vline 
WA_RMCP3_STR-FHORI sy-vline 
WA_RMCP3_STR-XKTEXT sy-vline 
WA_RMCP3_STR-XMATER sy-vline 
WA_RMCP3_STR-PLEBENE sy-vline 
WA_RMCP3_STR-ANZEB sy-vline 
WA_RMCP3_STR-HPRGR sy-vline 
WA_RMCP3_STR-HWERK sy-vline 
WA_RMCP3_STR-HMEIN sy-vline      INTO ld_text SEPARATED BY SPACE.

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