ABAP Select data from SAP table RFVI_UM_PERIODS_MINIMUM 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_PERIODS_MINIMUM 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_PERIODS_MINIMUM. 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_PERIODS_MINIMUM 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_PERIODS_MINIMUM TYPE STANDARD TABLE OF RFVI_UM_PERIODS_MINIMUM,
      WA_RFVI_UM_PERIODS_MINIMUM TYPE RFVI_UM_PERIODS_MINIMUM,
      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_PERIODS_MINIMUM> TYPE RFVI_UM_PERIODS_MINIMUM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFVI_UM_PERIODS_MINIMUM
*  INTO TABLE @DATA(IT_RFVI_UM_PERIODS_MINIMUM2).
*--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_PERIODS_MINIMUM INDEX 1 INTO DATA(WA_RFVI_UM_PERIODS_MINIMUM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFVI_UM_PERIODS_MINIMUM>-MANDT = 1.
<RFVI_UM_PERIODS_MINIMUM>-BUKRS = 1.
<RFVI_UM_PERIODS_MINIMUM>-SMIVE = 1.
<RFVI_UM_PERIODS_MINIMUM>-SWENR = 1.
<RFVI_UM_PERIODS_MINIMUM>-SMENR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFVI_UM_PERIODS_MINIMUM-INTRENO, sy-vline,
  WA_RFVI_UM_PERIODS_MINIMUM-GRATING_FROM, sy-vline,
  WA_RFVI_UM_PERIODS_MINIMUM-GRATING_TO, sy-vline,
  WA_RFVI_UM_PERIODS_MINIMUM-DAB_MISS_REP, sy-vline,
  WA_RFVI_UM_PERIODS_MINIMUM-DVONPER, sy-vline,
  WA_RFVI_UM_PERIODS_MINIMUM-DBISPER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFVI_UM_PERIODS_MINIMUM 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_PERIODS_MINIMUM 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_PERIODS_MINIMUM INTO WA_RFVI_UM_PERIODS_MINIMUM.


*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_PERIODS_MINIMUM-SMIVE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFVI_UM_PERIODS_MINIMUM-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_PERIODS_MINIMUM-SWENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFVI_UM_PERIODS_MINIMUM-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_PERIODS_MINIMUM-SMENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFVI_UM_PERIODS_MINIMUM-SMENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UEINHEIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RFVI_UM_PERIODS_MINIMUM-UEINHEIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RFVI_UM_PERIODS_MINIMUM-UEINHEIT.
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_PERIODS_MINIMUM_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
SMIVE TYPE STRING,
SWENR TYPE STRING,
SMENR TYPE STRING,
INTRENO TYPE STRING,
GRATING_FROM TYPE STRING,
GRATING_TO TYPE STRING,
DAB_MISS_REP TYPE STRING,
DVONPER TYPE STRING,
DBISPER TYPE STRING,
SUM_BMELD TYPE STRING,
SUM_MENG_MELD TYPE STRING,
SUM_BMELD_REL TYPE STRING,
SUM_UBMELD_REL TYPE STRING,
UMIETE TYPE STRING,
UMIETETAX TYPE STRING,
SBEWART TYPE STRING,
SWHRKOND TYPE STRING,
MWSKZ TYPE STRING,
TXJCD TYPE STRING,
UEINHEIT TYPE STRING,
JEXACT_DAY TYPE STRING,
NETTO_KZ TYPE STRING,
SKOART TYPE STRING,
MTR_NAME TYPE STRING,
SALDO_BETR TYPE STRING,
MWSAL_BETR TYPE STRING,
DMBTR TYPE STRING,
MWSTS TYPE STRING,
JCHG_NEW_TAX TYPE STRING,
JCHG_NEW_VIMIUH TYPE STRING,
JCHG_SETTLED TYPE STRING,
ERROR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFVI_UM_PERIODS_MINIMUM_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_PERIODS_MINIMUM_STR-MANDT sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-BUKRS sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SMIVE sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SWENR sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SMENR sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-INTRENO sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-GRATING_FROM sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-GRATING_TO sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-DAB_MISS_REP sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-DVONPER sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-DBISPER sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SUM_BMELD sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SUM_MENG_MELD sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SUM_BMELD_REL sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SUM_UBMELD_REL sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-UMIETE sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-UMIETETAX sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SBEWART sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SWHRKOND sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-MWSKZ sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-TXJCD sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-UEINHEIT sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-JEXACT_DAY sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-NETTO_KZ sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SKOART sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-MTR_NAME sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-SALDO_BETR sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-MWSAL_BETR sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-DMBTR sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-MWSTS sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-JCHG_NEW_TAX sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-JCHG_NEW_VIMIUH sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-JCHG_SETTLED sy-vline 
WA_RFVI_UM_PERIODS_MINIMUM_STR-ERROR sy-vline      INTO ld_text SEPARATED BY SPACE.

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