ABAP Select data from SAP table RJHTAKVB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RJHTAKVB
*  INTO TABLE @DATA(IT_RJHTAKVB2).
*--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_RJHTAKVB INDEX 1 INTO DATA(WA_RJHTAKVB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RJHTAKVB>-MANDT = 1.
<RJHTAKVB>-SAMMG = 1.
<RJHTAKVB>-SMART = 1.
<RJHTAKVB>-ERNAM = 1.
<RJHTAKVB>-ERDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RJHTAKVB-UZEIT, sy-vline,
  WA_RJHTAKVB-SSAMG, sy-vline,
  WA_RJHTAKVB-STTYP, sy-vline,
  WA_RJHTAKVB-VBNUM, sy-vline,
  WA_RJHTAKVB-HWNUM, sy-vline,
  WA_RJHTAKVB-EMNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RJHTAKVB 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_RJHTAKVB 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_RJHTAKVB INTO WA_RJHTAKVB.


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

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

*Conversion exit CUNIT, internal->external for field VOLEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RJHTAKVB-VOLEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RJHTAKVB-VOLEH.
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_RJHTAKVB_STR, 
MANDT TYPE STRING,
SAMMG TYPE STRING,
SMART TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
UZEIT TYPE STRING,
SSAMG TYPE STRING,
STTYP TYPE STRING,
VBNUM TYPE STRING,
HWNUM TYPE STRING,
EMNUM TYPE STRING,
WMNUM TYPE STRING,
SMNUM TYPE STRING,
IMNUM TYPE STRING,
BRTWK TYPE STRING,
WAERK TYPE STRING,
BRGEW TYPE STRING,
GEWEI TYPE STRING,
VOLUM TYPE STRING,
VOLEH TYPE STRING,
PROGRAMM TYPE STRING,
SELSET TYPE STRING,
BATCH TYPE STRING,
ANZGP TYPE STRING,
ANZGI TYPE STRING,
UEBAR TYPE STRING,
UEBTY TYPE STRING,
ENQMODE TYPE STRING,
UPDKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RJHTAKVB_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_RJHTAKVB_STR-MANDT sy-vline 
WA_RJHTAKVB_STR-SAMMG sy-vline 
WA_RJHTAKVB_STR-SMART sy-vline 
WA_RJHTAKVB_STR-ERNAM sy-vline 
WA_RJHTAKVB_STR-ERDAT sy-vline 
WA_RJHTAKVB_STR-UZEIT sy-vline 
WA_RJHTAKVB_STR-SSAMG sy-vline 
WA_RJHTAKVB_STR-STTYP sy-vline 
WA_RJHTAKVB_STR-VBNUM sy-vline 
WA_RJHTAKVB_STR-HWNUM sy-vline 
WA_RJHTAKVB_STR-EMNUM sy-vline 
WA_RJHTAKVB_STR-WMNUM sy-vline 
WA_RJHTAKVB_STR-SMNUM sy-vline 
WA_RJHTAKVB_STR-IMNUM sy-vline 
WA_RJHTAKVB_STR-BRTWK sy-vline 
WA_RJHTAKVB_STR-WAERK sy-vline 
WA_RJHTAKVB_STR-BRGEW sy-vline 
WA_RJHTAKVB_STR-GEWEI sy-vline 
WA_RJHTAKVB_STR-VOLUM sy-vline 
WA_RJHTAKVB_STR-VOLEH sy-vline 
WA_RJHTAKVB_STR-PROGRAMM sy-vline 
WA_RJHTAKVB_STR-SELSET sy-vline 
WA_RJHTAKVB_STR-BATCH sy-vline 
WA_RJHTAKVB_STR-ANZGP sy-vline 
WA_RJHTAKVB_STR-ANZGI sy-vline 
WA_RJHTAKVB_STR-UEBAR sy-vline 
WA_RJHTAKVB_STR-UEBTY sy-vline 
WA_RJHTAKVB_STR-ENQMODE sy-vline 
WA_RJHTAKVB_STR-UPDKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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