ABAP Select data from SAP table RCONT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCONT
*  INTO TABLE @DATA(IT_RCONT2).
*--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_RCONT INDEX 1 INTO DATA(WA_RCONT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCONT>-OFFSET = 1.
<RCONT>-OPCODE = 1.
<RCONT>-CBTYP = 1.
<RCONT>-FLAG = 1.
<RCONT>-BROF = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCONT-COMP, sy-vline,
  WA_RCONT-PAR0, sy-vline,
  WA_RCONT-PAR1, sy-vline,
  WA_RCONT-PAR2, sy-vline,
  WA_RCONT-PAR3, sy-vline,
  WA_RCONT-PAR4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCONT 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_RCONT 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_RCONT INTO WA_RCONT.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_RCONT_STR, 
OFFSET TYPE STRING,
OPCODE TYPE STRING,
CBTYP TYPE STRING,
FLAG TYPE STRING,
BROF TYPE STRING,
COMP TYPE STRING,
PAR0 TYPE STRING,
PAR1 TYPE STRING,
PAR2 TYPE STRING,
PAR3 TYPE STRING,
PAR4 TYPE STRING,
PAR5 TYPE STRING,
PAR6 TYPE STRING,
LINE TYPE STRING,
SOURCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCONT_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_RCONT_STR-OFFSET sy-vline 
WA_RCONT_STR-OPCODE sy-vline 
WA_RCONT_STR-CBTYP sy-vline 
WA_RCONT_STR-FLAG sy-vline 
WA_RCONT_STR-BROF sy-vline 
WA_RCONT_STR-COMP sy-vline 
WA_RCONT_STR-PAR0 sy-vline 
WA_RCONT_STR-PAR1 sy-vline 
WA_RCONT_STR-PAR2 sy-vline 
WA_RCONT_STR-PAR3 sy-vline 
WA_RCONT_STR-PAR4 sy-vline 
WA_RCONT_STR-PAR5 sy-vline 
WA_RCONT_STR-PAR6 sy-vline 
WA_RCONT_STR-LINE sy-vline 
WA_RCONT_STR-SOURCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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