ABAP Select data from SAP table RCGRESEPA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCGRESEPA
*  INTO TABLE @DATA(IT_RCGRESEPA2).
*--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_RCGRESEPA INDEX 1 INTO DATA(WA_RCGRESEPA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCGRESEPA>-MANDT = 1.
<RCGRESEPA>-RECSYS = 1.
<RCGRESEPA>-RECIDTYP = 1.
<RCGRESEPA>-RECID = 1.
<RCGRESEPA>-ADDID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCGRESEPA-REASONTYP, sy-vline,
  WA_RCGRESEPA-REASONCAT, sy-vline,
  WA_RCGRESEPA-REASONBPR, sy-vline,
  WA_RCGRESEPA-SENDER, sy-vline,
  WA_RCGRESEPA-SUBID, sy-vline,
  WA_RCGRESEPA-LDEPID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCGRESEPA 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_RCGRESEPA 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_RCGRESEPA INTO WA_RCGRESEPA.


*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 SPEC1, internal->external for field SUBID
CALL FUNCTION 'CONVERSION_EXIT_SPEC1_OUTPUT'
  EXPORTING
    input =                      WA_RCGRESEPA-SUBID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGRESEPA-SUBID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CHRID, internal->external for field LDEPID
CALL FUNCTION 'CONVERSION_EXIT_CHRID_OUTPUT'
  EXPORTING
    input =                      WA_RCGRESEPA-LDEPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGRESEPA-LDEPID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RCGRESEPA-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGRESEPA-LANGU.
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_RCGRESEPA_STR, 
MANDT TYPE STRING,
RECSYS TYPE STRING,
RECIDTYP TYPE STRING,
RECID TYPE STRING,
ADDID TYPE STRING,
REASONTYP TYPE STRING,
REASONCAT TYPE STRING,
REASONBPR TYPE STRING,
SENDER TYPE STRING,
SUBID TYPE STRING,
LDEPID TYPE STRING,
LANGU TYPE STRING,
VALDAT TYPE STRING,
LAWCOUNTRY TYPE STRING,
LAWREGION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCGRESEPA_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_RCGRESEPA_STR-MANDT sy-vline 
WA_RCGRESEPA_STR-RECSYS sy-vline 
WA_RCGRESEPA_STR-RECIDTYP sy-vline 
WA_RCGRESEPA_STR-RECID sy-vline 
WA_RCGRESEPA_STR-ADDID sy-vline 
WA_RCGRESEPA_STR-REASONTYP sy-vline 
WA_RCGRESEPA_STR-REASONCAT sy-vline 
WA_RCGRESEPA_STR-REASONBPR sy-vline 
WA_RCGRESEPA_STR-SENDER sy-vline 
WA_RCGRESEPA_STR-SUBID sy-vline 
WA_RCGRESEPA_STR-LDEPID sy-vline 
WA_RCGRESEPA_STR-LANGU sy-vline 
WA_RCGRESEPA_STR-VALDAT sy-vline 
WA_RCGRESEPA_STR-LAWCOUNTRY sy-vline 
WA_RCGRESEPA_STR-LAWREGION sy-vline      INTO ld_text SEPARATED BY SPACE.

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