ABAP Select data from SAP table RJKPOSCOM into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJKPOSCOM
*  INTO TABLE @DATA(IT_RJKPOSCOM2).
*--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_RJKPOSCOM INDEX 1 INTO DATA(WA_RJKPOSCOM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJKPOSCOM>-PVA = 1.
<RJKPOSCOM>-BEZUGSTYP = 1.
<RJKPOSCOM>-LIEFERART = 1.
<RJKPOSCOM>-FKPER = 1.
<RJKPOSCOM>-PERFK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJKPOSCOM-RCODE, sy-vline,
  WA_RJKPOSCOM-KONDA, sy-vline,
  WA_RJKPOSCOM-BEZPER, sy-vline,
  WA_RJKPOSCOM-ETMENGE, sy-vline,
  WA_RJKPOSCOM-ETMEINS, sy-vline,
  WA_RJKPOSCOM-DUEDAY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJKPOSCOM 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_RJKPOSCOM 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_RJKPOSCOM INTO WA_RJKPOSCOM.


*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 PVA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RJKPOSCOM-PVA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKPOSCOM-PVA.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field ADRNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RJKPOSCOM-ADRNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJKPOSCOM-ADRNR.
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_RJKPOSCOM_STR, 
PVA TYPE STRING,
BEZUGSTYP TYPE STRING,
LIEFERART TYPE STRING,
FKPER TYPE STRING,
PERFK TYPE STRING,
RCODE TYPE STRING,
KONDA TYPE STRING,
BEZPER TYPE STRING,
ETMENGE TYPE STRING,
ETMEINS TYPE STRING,
DUEDAY TYPE STRING,
IVWKN TYPE STRING,
PLTYP TYPE STRING,
KDGRP TYPE STRING,
ADRNR TYPE STRING,
ADRESSVAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJKPOSCOM_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_RJKPOSCOM_STR-PVA sy-vline 
WA_RJKPOSCOM_STR-BEZUGSTYP sy-vline 
WA_RJKPOSCOM_STR-LIEFERART sy-vline 
WA_RJKPOSCOM_STR-FKPER sy-vline 
WA_RJKPOSCOM_STR-PERFK sy-vline 
WA_RJKPOSCOM_STR-RCODE sy-vline 
WA_RJKPOSCOM_STR-KONDA sy-vline 
WA_RJKPOSCOM_STR-BEZPER sy-vline 
WA_RJKPOSCOM_STR-ETMENGE sy-vline 
WA_RJKPOSCOM_STR-ETMEINS sy-vline 
WA_RJKPOSCOM_STR-DUEDAY sy-vline 
WA_RJKPOSCOM_STR-IVWKN sy-vline 
WA_RJKPOSCOM_STR-PLTYP sy-vline 
WA_RJKPOSCOM_STR-KDGRP sy-vline 
WA_RJKPOSCOM_STR-ADRNR sy-vline 
WA_RJKPOSCOM_STR-ADRESSVAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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