ABAP Select data from SAP table RC29C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RC29C 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 RC29C. 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 RC29C 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_RC29C TYPE STANDARD TABLE OF RC29C,
      WA_RC29C TYPE RC29C,
      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: <RC29C> TYPE RC29C.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RC29C.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RC29C
  INTO TABLE IT_RC29C.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RC29C
*  INTO TABLE @DATA(IT_RC29C2).
*--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_RC29C INDEX 1 INTO DATA(WA_RC29C2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RC29C ASSIGNING <RC29C>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RC29C>-AENNR = 1.
<RC29C>-AENRA = 1.
<RC29C>-AUSKZ = 1.
<RC29C>-CLASS = 1.
<RC29C>-DATUB = 1.

ENDLOOP.

LOOP AT IT_RC29C INTO WA_RC29C.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RC29C-DATUV, sy-vline,
  WA_RC29C-EFFTYP, sy-vline,
  WA_RC29C-FPALT, sy-vline,
  WA_RC29C-LKENZ, sy-vline,
  WA_RC29C-STASZ, sy-vline,
  WA_RC29C-STLAL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RC29C 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_RC29C 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_RC29C INTO WA_RC29C.


*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 AENNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29C-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29C-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field AENRA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29C-AENRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29C-AENRA.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29C-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29C-STLAL.
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_RC29C_STR, 
AENNR TYPE STRING,
AENRA TYPE STRING,
AUSKZ TYPE STRING,
CLASS TYPE STRING,
DATUB TYPE STRING,
DATUV TYPE STRING,
EFFTYP TYPE STRING,
FPALT TYPE STRING,
LKENZ TYPE STRING,
STASZ TYPE STRING,
STLAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RC29C_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_RC29C_STR-AENNR sy-vline 
WA_RC29C_STR-AENRA sy-vline 
WA_RC29C_STR-AUSKZ sy-vline 
WA_RC29C_STR-CLASS sy-vline 
WA_RC29C_STR-DATUB sy-vline 
WA_RC29C_STR-DATUV sy-vline 
WA_RC29C_STR-EFFTYP sy-vline 
WA_RC29C_STR-FPALT sy-vline 
WA_RC29C_STR-LKENZ sy-vline 
WA_RC29C_STR-STASZ sy-vline 
WA_RC29C_STR-STLAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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