ABAP Select data from SAP table RKPOS_REST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKPOS_REST
*  INTO TABLE @DATA(IT_RKPOS_REST2).
*--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_RKPOS_REST INDEX 1 INTO DATA(WA_RKPOS_REST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKPOS_REST>-SELKZ = 1.
<RKPOS_REST>-WTGRES = 1.
<RKPOS_REST>-WOGRES = 1.
<RKPOS_REST>-WKGRES = 1.
<RKPOS_REST>-WKFRES = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKPOS_REST-BUREG, sy-vline,
  WA_RKPOS_REST-ABWST, sy-vline,
  WA_RKPOS_REST-AFABE, sy-vline,
  WA_RKPOS_REST-ANBAKT, sy-vline,
  WA_RKPOS_REST-ANBRES, sy-vline,
  WA_RKPOS_REST-SANBTR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKPOS_REST 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_RKPOS_REST 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_RKPOS_REST INTO WA_RKPOS_REST.


*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 AC152, internal->external for field WTGRES
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_REST-WTGRES
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_REST-WTGRES.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field WOGRES
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_REST-WOGRES
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_REST-WOGRES.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field WKGRES
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_REST-WKGRES
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_REST-WKGRES.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field WKFRES
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_REST-WKFRES
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_REST-WKFRES.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC132, internal->external for field ANBAKT
CALL FUNCTION 'CONVERSION_EXIT_AC132_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_REST-ANBAKT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_REST-ANBAKT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC132, internal->external for field ANBRES
CALL FUNCTION 'CONVERSION_EXIT_AC132_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_REST-ANBRES
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_REST-ANBRES.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC132, internal->external for field SANBTR
CALL FUNCTION 'CONVERSION_EXIT_AC132_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_REST-SANBTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_REST-SANBTR.
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_RKPOS_REST_STR, 
SELKZ TYPE STRING,
WTGRES TYPE STRING,
WOGRES TYPE STRING,
WKGRES TYPE STRING,
WKFRES TYPE STRING,
BUREG TYPE STRING,
ABWST TYPE STRING,
AFABE TYPE STRING,
ANBAKT TYPE STRING,
ANBRES TYPE STRING,
SANBTR TYPE STRING,
SWAERS TYPE STRING,
VBUREG TYPE STRING,
ABUREG TYPE STRING,
ABWNR TYPE STRING,
ABGKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKPOS_REST_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_RKPOS_REST_STR-SELKZ sy-vline 
WA_RKPOS_REST_STR-WTGRES sy-vline 
WA_RKPOS_REST_STR-WOGRES sy-vline 
WA_RKPOS_REST_STR-WKGRES sy-vline 
WA_RKPOS_REST_STR-WKFRES sy-vline 
WA_RKPOS_REST_STR-BUREG sy-vline 
WA_RKPOS_REST_STR-ABWST sy-vline 
WA_RKPOS_REST_STR-AFABE sy-vline 
WA_RKPOS_REST_STR-ANBAKT sy-vline 
WA_RKPOS_REST_STR-ANBRES sy-vline 
WA_RKPOS_REST_STR-SANBTR sy-vline 
WA_RKPOS_REST_STR-SWAERS sy-vline 
WA_RKPOS_REST_STR-VBUREG sy-vline 
WA_RKPOS_REST_STR-ABUREG sy-vline 
WA_RKPOS_REST_STR-ABWNR sy-vline 
WA_RKPOS_REST_STR-ABGKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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