ABAP Select data from SAP table CET_RCCMP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CET_RCCMP
*  INTO TABLE @DATA(IT_CET_RCCMP2).
*--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_CET_RCCMP INDEX 1 INTO DATA(WA_CET_RCCMP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CET_RCCMP>-TYPE = 1.
<CET_RCCMP>-XKEY = 1.
<CET_RCCMP>-DESCR = 1.
<CET_RCCMP>-PDOCID = 1.
<CET_RCCMP>-DOKAR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CET_RCCMP-DOKNR, sy-vline,
  WA_CET_RCCMP-DOKTL, sy-vline,
  WA_CET_RCCMP-DOKVR, sy-vline,
  WA_CET_RCCMP-CHANGE, sy-vline,
  WA_CET_RCCMP-CHANGESTATUS, sy-vline,
  WA_CET_RCCMP-MARKUP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CET_RCCMP 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_CET_RCCMP 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_CET_RCCMP INTO WA_CET_RCCMP.


*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 DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CET_RCCMP-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CET_RCCMP-DOKNR.
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_CET_RCCMP_STR, 
TYPE TYPE STRING,
XKEY TYPE STRING,
DESCR TYPE STRING,
PDOCID TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
CHANGE TYPE STRING,
CHANGESTATUS TYPE STRING,
MARKUP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CET_RCCMP_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_CET_RCCMP_STR-TYPE sy-vline 
WA_CET_RCCMP_STR-XKEY sy-vline 
WA_CET_RCCMP_STR-DESCR sy-vline 
WA_CET_RCCMP_STR-PDOCID sy-vline 
WA_CET_RCCMP_STR-DOKAR sy-vline 
WA_CET_RCCMP_STR-DOKNR sy-vline 
WA_CET_RCCMP_STR-DOKTL sy-vline 
WA_CET_RCCMP_STR-DOKVR sy-vline 
WA_CET_RCCMP_STR-CHANGE sy-vline 
WA_CET_RCCMP_STR-CHANGESTATUS sy-vline 
WA_CET_RCCMP_STR-MARKUP sy-vline      INTO ld_text SEPARATED BY SPACE.

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