ABAP Select data from SAP table RCGAPIDI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RCGAPIDI
*  INTO TABLE @DATA(IT_RCGAPIDI2).
*--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_RCGAPIDI INDEX 1 INTO DATA(WA_RCGAPIDI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RCGAPIDI>-RECNROOT = 1.
<RCGAPIDI>-WSAPPL1 = 1.
<RCGAPIDI>-FILEBYTES1 = 1.
<RCGAPIDI>-FILEPAGES1 = 1.
<RCGAPIDI>-WSAPPL2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RCGAPIDI-FILEBYTES2, sy-vline,
  WA_RCGAPIDI-FILEPAGES2, sy-vline,
  WA_RCGAPIDI-ERRORMODE, sy-vline,
  WA_RCGAPIDI-ERRORINFO, sy-vline,
  WA_RCGAPIDI-ERRORCLASS, sy-vline,
  WA_RCGAPIDI-ERRORPARAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RCGAPIDI 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_RCGAPIDI 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_RCGAPIDI INTO WA_RCGAPIDI.


*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 RECNROOT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RCGAPIDI-RECNROOT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RCGAPIDI-RECNROOT.
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_RCGAPIDI_STR, 
RECNROOT TYPE STRING,
WSAPPL1 TYPE STRING,
FILEBYTES1 TYPE STRING,
FILEPAGES1 TYPE STRING,
WSAPPL2 TYPE STRING,
FILEBYTES2 TYPE STRING,
FILEPAGES2 TYPE STRING,
ERRORMODE TYPE STRING,
ERRORINFO TYPE STRING,
ERRORCLASS TYPE STRING,
ERRORPARAM TYPE STRING,
LOGLOCKMOD TYPE STRING,
EXTINFO TYPE STRING,
LINEMOD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RCGAPIDI_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_RCGAPIDI_STR-RECNROOT sy-vline 
WA_RCGAPIDI_STR-WSAPPL1 sy-vline 
WA_RCGAPIDI_STR-FILEBYTES1 sy-vline 
WA_RCGAPIDI_STR-FILEPAGES1 sy-vline 
WA_RCGAPIDI_STR-WSAPPL2 sy-vline 
WA_RCGAPIDI_STR-FILEBYTES2 sy-vline 
WA_RCGAPIDI_STR-FILEPAGES2 sy-vline 
WA_RCGAPIDI_STR-ERRORMODE sy-vline 
WA_RCGAPIDI_STR-ERRORINFO sy-vline 
WA_RCGAPIDI_STR-ERRORCLASS sy-vline 
WA_RCGAPIDI_STR-ERRORPARAM sy-vline 
WA_RCGAPIDI_STR-LOGLOCKMOD sy-vline 
WA_RCGAPIDI_STR-EXTINFO sy-vline 
WA_RCGAPIDI_STR-LINEMOD sy-vline      INTO ld_text SEPARATED BY SPACE.

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