ABAP Select data from SAP table REVAL_PARA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM REVAL_PARA
*  INTO TABLE @DATA(IT_REVAL_PARA2).
*--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_REVAL_PARA INDEX 1 INTO DATA(WA_REVAL_PARA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<REVAL_PARA>-BUKRS = 1.
<REVAL_PARA>-RANL = 1.
<REVAL_PARA>-RLDEPO = 1.
<REVAL_PARA>-SREVRNG = 1.
<REVAL_PARA>-SREVCST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_REVAL_PARA-SREVCLS, sy-vline,
  WA_REVAL_PARA-SREVTYP, sy-vline,
  WA_REVAL_PARA-SREVGRP, sy-vline,
  WA_REVAL_PARA-SREVAC, sy-vline,
  WA_REVAL_PARA-SREVPRC, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_REVAL_PARA 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_REVAL_PARA 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_REVAL_PARA INTO WA_REVAL_PARA.


*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 RANL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_REVAL_PARA-RANL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_REVAL_PARA-RANL.
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_REVAL_PARA_STR, 
BUKRS TYPE STRING,
RANL TYPE STRING,
RLDEPO TYPE STRING,
SREVRNG TYPE STRING,
SREVCST TYPE STRING,
SREVCLS TYPE STRING,
SREVTYP TYPE STRING,
SREVGRP TYPE STRING,
SREVAC TYPE STRING,
SREVPRC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_REVAL_PARA_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_REVAL_PARA_STR-BUKRS sy-vline 
WA_REVAL_PARA_STR-RANL sy-vline 
WA_REVAL_PARA_STR-RLDEPO sy-vline 
WA_REVAL_PARA_STR-SREVRNG sy-vline 
WA_REVAL_PARA_STR-SREVCST sy-vline 
WA_REVAL_PARA_STR-SREVCLS sy-vline 
WA_REVAL_PARA_STR-SREVTYP sy-vline 
WA_REVAL_PARA_STR-SREVGRP sy-vline 
WA_REVAL_PARA_STR-SREVAC sy-vline 
WA_REVAL_PARA_STR-SREVPRC sy-vline      INTO ld_text SEPARATED BY SPACE.

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