ABAP Select data from SAP table RFCPA into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RFCPA 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 RFCPA. 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 RFCPA 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_RFCPA TYPE STANDARD TABLE OF RFCPA,
      WA_RFCPA TYPE RFCPA,
      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: <RFCPA> TYPE RFCPA.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RFCPA
*  INTO TABLE @DATA(IT_RFCPA2).
*--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_RFCPA INDEX 1 INTO DATA(WA_RFCPA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RFCPA>-NUM = 1.
<RFCPA>-CLASS = 1.
<RFCPA>-NAME = 1.
<RFCPA>-NAMELOWER = 1.
<RFCPA>-NAMEUPLOW = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RFCPA-NAMELEN, sy-vline,
  WA_RFCPA-TYPE, sy-vline,
  WA_RFCPA-LEN, sy-vline,
  WA_RFCPA-DECIMALS, sy-vline,
  WA_RFCPA-DEFAULT, sy-vline,
  WA_RFCPA-POS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RFCPA 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_RFCPA 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_RFCPA INTO WA_RFCPA.


*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_RFCPA_STR, 
NUM TYPE STRING,
CLASS TYPE STRING,
NAME TYPE STRING,
NAMELOWER TYPE STRING,
NAMEUPLOW TYPE STRING,
NAMELEN TYPE STRING,
TYPE TYPE STRING,
LEN TYPE STRING,
DECIMALS TYPE STRING,
DEFAULT TYPE STRING,
POS TYPE STRING,
POS0 TYPE STRING,
OFFSET TYPE STRING,
APOS TYPE STRING,
APOS0 TYPE STRING,
AOFFSET TYPE STRING,
NUMFIELDS TYPE STRING,
ABAPTYPE TYPE STRING,
CTYPE TYPE STRING,
CRFCTYPE TYPE STRING,
VBTYPE TYPE STRING,
VBTYPEAS TYPE STRING,
FIELDNAME TYPE STRING,
FNAMELOWER TYPE STRING,
FNAMEUPLOW TYPE STRING,
FIELDTYPE TYPE STRING,
FIELDLEN TYPE STRING,
STRUCTNAME TYPE STRING,
SNAMELOWER TYPE STRING,
SNAMEUPLOW TYPE STRING,
STRUCTTYPE TYPE STRING,
STRUCTLEN TYPE STRING,
TABNAME TYPE STRING,
TNAMELOWER TYPE STRING,
TNAMEUPLOW TYPE STRING,
TABTYPE TYPE STRING,
TABLEN TYPE STRING,
EXCEPTION TYPE STRING,
EXCLOWER TYPE STRING,
EXCUPLOW TYPE STRING,
EXCLEN TYPE STRING,
TEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RFCPA_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_RFCPA_STR-NUM sy-vline 
WA_RFCPA_STR-CLASS sy-vline 
WA_RFCPA_STR-NAME sy-vline 
WA_RFCPA_STR-NAMELOWER sy-vline 
WA_RFCPA_STR-NAMEUPLOW sy-vline 
WA_RFCPA_STR-NAMELEN sy-vline 
WA_RFCPA_STR-TYPE sy-vline 
WA_RFCPA_STR-LEN sy-vline 
WA_RFCPA_STR-DECIMALS sy-vline 
WA_RFCPA_STR-DEFAULT sy-vline 
WA_RFCPA_STR-POS sy-vline 
WA_RFCPA_STR-POS0 sy-vline 
WA_RFCPA_STR-OFFSET sy-vline 
WA_RFCPA_STR-APOS sy-vline 
WA_RFCPA_STR-APOS0 sy-vline 
WA_RFCPA_STR-AOFFSET sy-vline 
WA_RFCPA_STR-NUMFIELDS sy-vline 
WA_RFCPA_STR-ABAPTYPE sy-vline 
WA_RFCPA_STR-CTYPE sy-vline 
WA_RFCPA_STR-CRFCTYPE sy-vline 
WA_RFCPA_STR-VBTYPE sy-vline 
WA_RFCPA_STR-VBTYPEAS sy-vline 
WA_RFCPA_STR-FIELDNAME sy-vline 
WA_RFCPA_STR-FNAMELOWER sy-vline 
WA_RFCPA_STR-FNAMEUPLOW sy-vline 
WA_RFCPA_STR-FIELDTYPE sy-vline 
WA_RFCPA_STR-FIELDLEN sy-vline 
WA_RFCPA_STR-STRUCTNAME sy-vline 
WA_RFCPA_STR-SNAMELOWER sy-vline 
WA_RFCPA_STR-SNAMEUPLOW sy-vline 
WA_RFCPA_STR-STRUCTTYPE sy-vline 
WA_RFCPA_STR-STRUCTLEN sy-vline 
WA_RFCPA_STR-TABNAME sy-vline 
WA_RFCPA_STR-TNAMELOWER sy-vline 
WA_RFCPA_STR-TNAMEUPLOW sy-vline 
WA_RFCPA_STR-TABTYPE sy-vline 
WA_RFCPA_STR-TABLEN sy-vline 
WA_RFCPA_STR-EXCEPTION sy-vline 
WA_RFCPA_STR-EXCLOWER sy-vline 
WA_RFCPA_STR-EXCUPLOW sy-vline 
WA_RFCPA_STR-EXCLEN sy-vline 
WA_RFCPA_STR-TEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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