ABAP Select data from SAP table RK23A into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RK23A 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 RK23A. 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 RK23A 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_RK23A TYPE STANDARD TABLE OF RK23A,
      WA_RK23A TYPE RK23A,
      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: <RK23A> TYPE RK23A.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RK23A.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RK23A
  INTO TABLE IT_RK23A.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RK23A
*  INTO TABLE @DATA(IT_RK23A2).
*--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_RK23A INDEX 1 INTO DATA(WA_RK23A2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RK23A ASSIGNING <RK23A>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RK23A>-TWAER = 1.
<RK23A>-VERSN = 1.
<RK23A>-ZLENR = 1.
<RK23A>-NITEM = 1.
<RK23A>-IKPTP = 1.

ENDLOOP.

LOOP AT IT_RK23A INTO WA_RK23A.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RK23A-IKPTN, sy-vline,
  WA_RK23A-IKSTP, sy-vline,
  WA_RK23A-IKSTN, sy-vline,
  WA_RK23A-IKFTP, sy-vline,
  WA_RK23A-IKVTP, sy-vline,
  WA_RK23A-IKFTN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RK23A 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_RK23A 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_RK23A INTO WA_RK23A.


*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 VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-VERSN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field IKPTP
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-IKPTP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-IKPTP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field IKPTN
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-IKPTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-IKPTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field IKSTP
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-IKSTP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-IKSTP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field IKSTN
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-IKSTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-IKSTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field IKFTP
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-IKFTP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-IKFTP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field IKVTP
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-IKVTP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-IKVTP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field IKFTN
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-IKFTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-IKFTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC172, internal->external for field IKVTN
CALL FUNCTION 'CONVERSION_EXIT_AC172_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-IKVTN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-IKVTN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKGSU
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-TKGSU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-TKGSU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC112, internal->external for field TKFSU
CALL FUNCTION 'CONVERSION_EXIT_AC112_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-TKFSU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-TKFSU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field BETRG
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-BETRG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-BETRG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit AC152, internal->external for field RESTB
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-RESTB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-RESTB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field VEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RK23A-VEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RK23A-VEINH.
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_RK23A_STR, 
TWAER TYPE STRING,
VERSN TYPE STRING,
ZLENR TYPE STRING,
NITEM TYPE STRING,
IKPTP TYPE STRING,
IKPTN TYPE STRING,
IKSTP TYPE STRING,
IKSTN TYPE STRING,
IKFTP TYPE STRING,
IKVTP TYPE STRING,
IKFTN TYPE STRING,
IKVTN TYPE STRING,
SAKST TYPE STRING,
SAAUF TYPE STRING,
SAPRO TYPE STRING,
SAKTR TYPE STRING,
SAPRN TYPE STRING,
SANPL TYPE STRING,
SAKDA TYPE STRING,
SAIMKEY TYPE STRING,
SAERG TYPE STRING,
SASAF TYPE STRING,
EAKST TYPE STRING,
EAAUF TYPE STRING,
EAPRO TYPE STRING,
EAKTR TYPE STRING,
EAPRN TYPE STRING,
EANPL TYPE STRING,
EAKDA TYPE STRING,
EAIMKEY TYPE STRING,
EAERG TYPE STRING,
EASAF TYPE STRING,
EAKLS TYPE STRING,
EAKOA TYPE STRING,
EALST TYPE STRING,
EASTK TYPE STRING,
EAPNR TYPE STRING,
SHOL1 TYPE STRING,
SHOL2 TYPE STRING,
SHOL3 TYPE STRING,
EHOL1 TYPE STRING,
EHOL2 TYPE STRING,
EHOL3 TYPE STRING,
KAHOL TYPE STRING,
STHOL TYPE STRING,
MEHOL TYPE STRING,
GRTYP_TEXT TYPE STRING,
TKGSU TYPE STRING,
TKFSU TYPE STRING,
XTWAER TYPE STRING,
BETRG TYPE STRING,
MENGE TYPE STRING,
RESTB TYPE STRING,
RESTM TYPE STRING,
VEINH TYPE STRING,
FRAME_TEXT TYPE STRING,
FRAMETITLE TYPE STRING,
PUSHB1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RK23A_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_RK23A_STR-TWAER sy-vline 
WA_RK23A_STR-VERSN sy-vline 
WA_RK23A_STR-ZLENR sy-vline 
WA_RK23A_STR-NITEM sy-vline 
WA_RK23A_STR-IKPTP sy-vline 
WA_RK23A_STR-IKPTN sy-vline 
WA_RK23A_STR-IKSTP sy-vline 
WA_RK23A_STR-IKSTN sy-vline 
WA_RK23A_STR-IKFTP sy-vline 
WA_RK23A_STR-IKVTP sy-vline 
WA_RK23A_STR-IKFTN sy-vline 
WA_RK23A_STR-IKVTN sy-vline 
WA_RK23A_STR-SAKST sy-vline 
WA_RK23A_STR-SAAUF sy-vline 
WA_RK23A_STR-SAPRO sy-vline 
WA_RK23A_STR-SAKTR sy-vline 
WA_RK23A_STR-SAPRN sy-vline 
WA_RK23A_STR-SANPL sy-vline 
WA_RK23A_STR-SAKDA sy-vline 
WA_RK23A_STR-SAIMKEY sy-vline 
WA_RK23A_STR-SAERG sy-vline 
WA_RK23A_STR-SASAF sy-vline 
WA_RK23A_STR-EAKST sy-vline 
WA_RK23A_STR-EAAUF sy-vline 
WA_RK23A_STR-EAPRO sy-vline 
WA_RK23A_STR-EAKTR sy-vline 
WA_RK23A_STR-EAPRN sy-vline 
WA_RK23A_STR-EANPL sy-vline 
WA_RK23A_STR-EAKDA sy-vline 
WA_RK23A_STR-EAIMKEY sy-vline 
WA_RK23A_STR-EAERG sy-vline 
WA_RK23A_STR-EASAF sy-vline 
WA_RK23A_STR-EAKLS sy-vline 
WA_RK23A_STR-EAKOA sy-vline 
WA_RK23A_STR-EALST sy-vline 
WA_RK23A_STR-EASTK sy-vline 
WA_RK23A_STR-EAPNR sy-vline 
WA_RK23A_STR-SHOL1 sy-vline 
WA_RK23A_STR-SHOL2 sy-vline 
WA_RK23A_STR-SHOL3 sy-vline 
WA_RK23A_STR-EHOL1 sy-vline 
WA_RK23A_STR-EHOL2 sy-vline 
WA_RK23A_STR-EHOL3 sy-vline 
WA_RK23A_STR-KAHOL sy-vline 
WA_RK23A_STR-STHOL sy-vline 
WA_RK23A_STR-MEHOL sy-vline 
WA_RK23A_STR-GRTYP_TEXT sy-vline 
WA_RK23A_STR-TKGSU sy-vline 
WA_RK23A_STR-TKFSU sy-vline 
WA_RK23A_STR-XTWAER sy-vline 
WA_RK23A_STR-BETRG sy-vline 
WA_RK23A_STR-MENGE sy-vline 
WA_RK23A_STR-RESTB sy-vline 
WA_RK23A_STR-RESTM sy-vline 
WA_RK23A_STR-VEINH sy-vline 
WA_RK23A_STR-FRAME_TEXT sy-vline 
WA_RK23A_STR-FRAMETITLE sy-vline 
WA_RK23A_STR-PUSHB1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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