ABAP Select data from SAP table RKPOS_PI into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

Below is a number of ABAP code snippets to demonstrate how to select data from SAP RKPOS_PI 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_PI. 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_PI 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_PI TYPE STANDARD TABLE OF RKPOS_PI,
      WA_RKPOS_PI TYPE RKPOS_PI,
      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_PI> TYPE RKPOS_PI.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RKPOS_PI
*  INTO TABLE @DATA(IT_RKPOS_PI2).
*--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_PI INDEX 1 INTO DATA(WA_RKPOS_PI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RKPOS_PI>-WRTTP = 1.
<RKPOS_PI>-BEKNZ = 1.
<RKPOS_PI>-KSTAR = 1.
<RKPOS_PI>-HRKFT = 1.
<RKPOS_PI>-BUZEI = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RKPOS_PI-ZLENR, sy-vline,
  WA_RKPOS_PI-PERIO, sy-vline,
  WA_RKPOS_PI-MVFLG, sy-vline,
  WA_RKPOS_PI-MUVFLG, sy-vline,
  WA_RKPOS_PI-BWAER, sy-vline,
  WA_RKPOS_PI-SGTXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RKPOS_PI 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_PI 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_PI INTO WA_RKPOS_PI.


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

*Conversion exit BEKNZ, internal->external for field BEKNZ
CALL FUNCTION 'CONVERSION_EXIT_BEKNZ_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_PI-BEKNZ
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_PI-BEKNZ.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field EBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RKPOS_PI-EBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RKPOS_PI-EBELN.
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_PI_STR, 
WRTTP TYPE STRING,
BEKNZ TYPE STRING,
KSTAR TYPE STRING,
HRKFT TYPE STRING,
BUZEI TYPE STRING,
ZLENR TYPE STRING,
PERIO TYPE STRING,
MVFLG TYPE STRING,
MUVFLG TYPE STRING,
BWAER TYPE STRING,
SGTXT TYPE STRING,
REFBZ TYPE STRING,
GKOAR TYPE STRING,
GKONT TYPE STRING,
EBELN TYPE STRING,
EBELP TYPE STRING,
ZEKKN TYPE STRING,
BTRKL TYPE STRING,
BELTP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RKPOS_PI_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_PI_STR-WRTTP sy-vline 
WA_RKPOS_PI_STR-BEKNZ sy-vline 
WA_RKPOS_PI_STR-KSTAR sy-vline 
WA_RKPOS_PI_STR-HRKFT sy-vline 
WA_RKPOS_PI_STR-BUZEI sy-vline 
WA_RKPOS_PI_STR-ZLENR sy-vline 
WA_RKPOS_PI_STR-PERIO sy-vline 
WA_RKPOS_PI_STR-MVFLG sy-vline 
WA_RKPOS_PI_STR-MUVFLG sy-vline 
WA_RKPOS_PI_STR-BWAER sy-vline 
WA_RKPOS_PI_STR-SGTXT sy-vline 
WA_RKPOS_PI_STR-REFBZ sy-vline 
WA_RKPOS_PI_STR-GKOAR sy-vline 
WA_RKPOS_PI_STR-GKONT sy-vline 
WA_RKPOS_PI_STR-EBELN sy-vline 
WA_RKPOS_PI_STR-EBELP sy-vline 
WA_RKPOS_PI_STR-ZEKKN sy-vline 
WA_RKPOS_PI_STR-BTRKL sy-vline 
WA_RKPOS_PI_STR-BELTP sy-vline      INTO ld_text SEPARATED BY SPACE.

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