ABAP Select data from SAP table RMSCH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RMSCH
*  INTO TABLE @DATA(IT_RMSCH2).
*--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_RMSCH INDEX 1 INTO DATA(WA_RMSCH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RMSCH>-ALAND = 1.
<RMSCH>-TATYP = 1.
<RMSCH>-TAXKM = 1.
<RMSCH>-LFPEO = 1.
<RMSCH>-VPERI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RMSCH-VORLA, sy-vline,
  WA_RMSCH-STRICH, sy-vline,
  WA_RMSCH-LGORT, sy-vline,
  WA_RMSCH-RLGOR, sy-vline,
  WA_RMSCH-DISKZ, sy-vline,
  WA_RMSCH-LMINB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RMSCH 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_RMSCH 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_RMSCH INTO WA_RMSCH.


*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 GJAHR, internal->external for field PDATZ
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_RMSCH-PDATZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMSCH-PDATZ.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field GROBPLAN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RMSCH-GROBPLAN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RMSCH-GROBPLAN.
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_RMSCH_STR, 
ALAND TYPE STRING,
TATYP TYPE STRING,
TAXKM TYPE STRING,
LFPEO TYPE STRING,
VPERI TYPE STRING,
VORLA TYPE STRING,
STRICH TYPE STRING,
LGORT TYPE STRING,
RLGOR TYPE STRING,
DISKZ TYPE STRING,
LMINB TYPE STRING,
LBSTF TYPE STRING,
LGPBE TYPE STRING,
PROFT TYPE STRING,
VTLAG TYPE STRING,
KALKZ TYPE STRING,
PPRDZ TYPE STRING,
PDATZ TYPE STRING,
BWVAR TYPE STRING,
VERSI TYPE STRING,
ZPLPX TYPE STRING,
PLAN1 TYPE STRING,
PLAN2 TYPE STRING,
PLAN3 TYPE STRING,
VERW_NEUFB TYPE STRING,
VERW_COMM TYPE STRING,
VER_NOMSTA TYPE STRING,
VER_SPERR TYPE STRING,
VER_BATCH TYPE STRING,
RAHMENT1 TYPE STRING,
RAHMENT2 TYPE STRING,
PLPRS TYPE STRING,
MLFDNR TYPE STRING,
FEINPLAN TYPE STRING,
RATENPLAN TYPE STRING,
GROBPLAN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RMSCH_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_RMSCH_STR-ALAND sy-vline 
WA_RMSCH_STR-TATYP sy-vline 
WA_RMSCH_STR-TAXKM sy-vline 
WA_RMSCH_STR-LFPEO sy-vline 
WA_RMSCH_STR-VPERI sy-vline 
WA_RMSCH_STR-VORLA sy-vline 
WA_RMSCH_STR-STRICH sy-vline 
WA_RMSCH_STR-LGORT sy-vline 
WA_RMSCH_STR-RLGOR sy-vline 
WA_RMSCH_STR-DISKZ sy-vline 
WA_RMSCH_STR-LMINB sy-vline 
WA_RMSCH_STR-LBSTF sy-vline 
WA_RMSCH_STR-LGPBE sy-vline 
WA_RMSCH_STR-PROFT sy-vline 
WA_RMSCH_STR-VTLAG sy-vline 
WA_RMSCH_STR-KALKZ sy-vline 
WA_RMSCH_STR-PPRDZ sy-vline 
WA_RMSCH_STR-PDATZ sy-vline 
WA_RMSCH_STR-BWVAR sy-vline 
WA_RMSCH_STR-VERSI sy-vline 
WA_RMSCH_STR-ZPLPX sy-vline 
WA_RMSCH_STR-PLAN1 sy-vline 
WA_RMSCH_STR-PLAN2 sy-vline 
WA_RMSCH_STR-PLAN3 sy-vline 
WA_RMSCH_STR-VERW_NEUFB sy-vline 
WA_RMSCH_STR-VERW_COMM sy-vline 
WA_RMSCH_STR-VER_NOMSTA sy-vline 
WA_RMSCH_STR-VER_SPERR sy-vline 
WA_RMSCH_STR-VER_BATCH sy-vline 
WA_RMSCH_STR-RAHMENT1 sy-vline 
WA_RMSCH_STR-RAHMENT2 sy-vline 
WA_RMSCH_STR-PLPRS sy-vline 
WA_RMSCH_STR-MLFDNR sy-vline 
WA_RMSCH_STR-FEINPLAN sy-vline 
WA_RMSCH_STR-RATENPLAN sy-vline 
WA_RMSCH_STR-GROBPLAN sy-vline      INTO ld_text SEPARATED BY SPACE.

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