ABAP Select data from SAP table RFVI_UM_ALV_HEADER into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFVI_UM_ALV_HEADER
*  INTO TABLE @DATA(IT_RFVI_UM_ALV_HEADER2).
*--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_RFVI_UM_ALV_HEADER INDEX 1 INTO DATA(WA_RFVI_UM_ALV_HEADER2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFVI_UM_ALV_HEADER>-JMARK = 1.
<RFVI_UM_ALV_HEADER>-JEXPAND = 1.
<RFVI_UM_ALV_HEADER>-MANDT = 1.
<RFVI_UM_ALV_HEADER>-BUKRS = 1.
<RFVI_UM_ALV_HEADER>-INTRENO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFVI_UM_ALV_HEADER-SMIVE, sy-vline,
  WA_RFVI_UM_ALV_HEADER-E_SMIVE, sy-vline,
  WA_RFVI_UM_ALV_HEADER-SWENR, sy-vline,
  WA_RFVI_UM_ALV_HEADER-SMENR, sy-vline,
  WA_RFVI_UM_ALV_HEADER-RECNNR, sy-vline,
  WA_RFVI_UM_ALV_HEADER-KUNNR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFVI_UM_ALV_HEADER 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_RFVI_UM_ALV_HEADER 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_RFVI_UM_ALV_HEADER INTO WA_RFVI_UM_ALV_HEADER.


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

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

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

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

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

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

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

*Conversion exit IMKEY, internal->external for field ID
CALL FUNCTION 'CONVERSION_EXIT_IMKEY_OUTPUT'
  EXPORTING
    input =                      WA_RFVI_UM_ALV_HEADER-ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFVI_UM_ALV_HEADER-ID.
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_RFVI_UM_ALV_HEADER_STR, 
JMARK TYPE STRING,
JEXPAND TYPE STRING,
MANDT TYPE STRING,
BUKRS TYPE STRING,
INTRENO TYPE STRING,
SMIVE TYPE STRING,
E_SMIVE TYPE STRING,
SWENR TYPE STRING,
SMENR TYPE STRING,
RECNNR TYPE STRING,
KUNNR TYPE STRING,
UMIETE TYPE STRING,
MTR_NAME TYPE STRING,
SKOART TYPE STRING,
XKOARTM TYPE STRING,
SWHRKOND TYPE STRING,
MWSKZ TYPE STRING,
TXJCD TYPE STRING,
UEINHEIT TYPE STRING,
UMIETETAX TYPE STRING,
DMELDV TYPE STRING,
DMELDB TYPE STRING,
GRATING_FROM TYPE STRING,
GRATING_TO TYPE STRING,
BMELD TYPE STRING,
UBMELD TYPE STRING,
BMELD_REL TYPE STRING,
UBMELD_REL TYPE STRING,
DMBTR TYPE STRING,
MWSTS TYPE STRING,
SALDO_BETR TYPE STRING,
MWSAL_BETR TYPE STRING,
JEXACT_DAY TYPE STRING,
JCHG_NEW_TAX TYPE STRING,
JCHG_NEW_VIMIUH TYPE STRING,
JCHG_SETTLED TYPE STRING,
JVSTOPT TYPE STRING,
JRECN TYPE STRING,
DAB_MISS_REP TYPE STRING,
ICON TYPE STRING,
ID TYPE STRING,
UMIETE_UMIN TYPE STRING,
UMIETETAX_UMIN TYPE STRING,
UMIETE_UMAX TYPE STRING,
UMIETETAX_UMAX TYPE STRING,
UMIETE_CMP TYPE STRING,
UMIETETAX_CMP TYPE STRING,
INFO4CALC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFVI_UM_ALV_HEADER_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_RFVI_UM_ALV_HEADER_STR-JMARK sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-JEXPAND sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-MANDT sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-BUKRS sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-INTRENO sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-SMIVE sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-E_SMIVE sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-SWENR sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-SMENR sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-RECNNR sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-KUNNR sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UMIETE sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-MTR_NAME sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-SKOART sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-XKOARTM sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-SWHRKOND sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-MWSKZ sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-TXJCD sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UEINHEIT sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UMIETETAX sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-DMELDV sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-DMELDB sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-GRATING_FROM sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-GRATING_TO sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-BMELD sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UBMELD sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-BMELD_REL sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UBMELD_REL sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-DMBTR sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-MWSTS sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-SALDO_BETR sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-MWSAL_BETR sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-JEXACT_DAY sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-JCHG_NEW_TAX sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-JCHG_NEW_VIMIUH sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-JCHG_SETTLED sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-JVSTOPT sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-JRECN sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-DAB_MISS_REP sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-ICON sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-ID sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UMIETE_UMIN sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UMIETETAX_UMIN sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UMIETE_UMAX sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UMIETETAX_UMAX sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UMIETE_CMP sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-UMIETETAX_CMP sy-vline 
WA_RFVI_UM_ALV_HEADER_STR-INFO4CALC sy-vline      INTO ld_text SEPARATED BY SPACE.

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