ABAP Select data from SAP table RC29N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RC29N 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 RC29N. 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 RC29N 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_RC29N TYPE STANDARD TABLE OF RC29N,
      WA_RC29N TYPE RC29N,
      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: <RC29N> TYPE RC29N.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RC29N.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RC29N
  INTO TABLE IT_RC29N.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RC29N
*  INTO TABLE @DATA(IT_RC29N2).
*--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_RC29N INDEX 1 INTO DATA(WA_RC29N2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RC29N ASSIGNING <RC29N>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RC29N>-AENNR = 1.
<RC29N>-AETXT = 1.
<RC29N>-ATEXT = 1.
<RC29N>-BMEIN = 1.
<RC29N>-CLASS = 1.

ENDLOOP.

LOOP AT IT_RC29N INTO WA_RC29N.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RC29N-DATUB, sy-vline,
  WA_RC29N-DATUV, sy-vline,
  WA_RC29N-DOKAR, sy-vline,
  WA_RC29N-DOKNR, sy-vline,
  WA_RC29N-DOKTL, sy-vline,
  WA_RC29N-DOKVR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RC29N 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_RC29N 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_RC29N INTO WA_RC29N.


*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_RC29N-AENNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-AENNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BMEIN
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-BMEIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-BMEIN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field NDONR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-NDONR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-NDONR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field NIDNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-NIDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-NIDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ODONR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-ODONR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-ODONR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field OIDNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-OIDNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-OIDNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-PSPNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field REENR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-REENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-REENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field REVLV
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-REVLV
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-REVLV.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field STLAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-STLAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-STLAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLNR
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-STLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-STLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field TPLNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-TPLNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-TPLNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VBELN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-VBELN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-VBELN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VDKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-VDKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-VDKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VEQNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-VEQNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-VEQNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field VMTNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-VMTNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-VMTNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field VTPNR
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-VTPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-VTPNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLMN
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-STLMN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-STLMN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field STLMX
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_RC29N-STLMX
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RC29N-STLMX.
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_RC29N_STR, 
AENNR TYPE STRING,
AETXT TYPE STRING,
ATEXT TYPE STRING,
BMEIN TYPE STRING,
CLASS TYPE STRING,
DATUB TYPE STRING,
DATUV TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
EMENG TYPE STRING,
EQUNR TYPE STRING,
EXSTL TYPE STRING,
LABOR TYPE STRING,
LBTXT TYPE STRING,
KLART TYPE STRING,
KLATX TYPE STRING,
MATNR TYPE STRING,
MEADD TYPE STRING,
MEFAK TYPE STRING,
NCLAR TYPE STRING,
NCLNR TYPE STRING,
NDOAR TYPE STRING,
NDONR TYPE STRING,
NDOTL TYPE STRING,
NDOVR TYPE STRING,
NEWNO TYPE STRING,
NIDNR TYPE STRING,
OBKTX TYPE STRING,
OCLAR TYPE STRING,
OCLNR TYPE STRING,
ODOAR TYPE STRING,
ODONR TYPE STRING,
ODOTL TYPE STRING,
ODOVR TYPE STRING,
OIDNR TYPE STRING,
OOKTX TYPE STRING,
PSPNR TYPE STRING,
PRTXT TYPE STRING,
REENR TYPE STRING,
REVLV TYPE STRING,
STLAL TYPE STRING,
STLAN TYPE STRING,
STLNR TYPE STRING,
STOBJ TYPE STRING,
TETYP TYPE STRING,
TPLNR TYPE STRING,
TYPTX TYPE STRING,
VBELN TYPE STRING,
VBPOS TYPE STRING,
VCLAS TYPE STRING,
VDKNR TYPE STRING,
VDKAR TYPE STRING,
VDKTL TYPE STRING,
VDKVR TYPE STRING,
VEQNR TYPE STRING,
VKLAR TYPE STRING,
VMTNR TYPE STRING,
VTPNR TYPE STRING,
WERKS TYPE STRING,
WTEXT TYPE STRING,
ZWERK TYPE STRING,
ZWTXT TYPE STRING,
MAKN1 TYPE STRING,
MAKN2 TYPE STRING,
MAKN3 TYPE STRING,
MCLMT TYPE STRING,
STLMN TYPE STRING,
STLMX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RC29N_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_RC29N_STR-AENNR sy-vline 
WA_RC29N_STR-AETXT sy-vline 
WA_RC29N_STR-ATEXT sy-vline 
WA_RC29N_STR-BMEIN sy-vline 
WA_RC29N_STR-CLASS sy-vline 
WA_RC29N_STR-DATUB sy-vline 
WA_RC29N_STR-DATUV sy-vline 
WA_RC29N_STR-DOKAR sy-vline 
WA_RC29N_STR-DOKNR sy-vline 
WA_RC29N_STR-DOKTL sy-vline 
WA_RC29N_STR-DOKVR sy-vline 
WA_RC29N_STR-EMENG sy-vline 
WA_RC29N_STR-EQUNR sy-vline 
WA_RC29N_STR-EXSTL sy-vline 
WA_RC29N_STR-LABOR sy-vline 
WA_RC29N_STR-LBTXT sy-vline 
WA_RC29N_STR-KLART sy-vline 
WA_RC29N_STR-KLATX sy-vline 
WA_RC29N_STR-MATNR sy-vline 
WA_RC29N_STR-MEADD sy-vline 
WA_RC29N_STR-MEFAK sy-vline 
WA_RC29N_STR-NCLAR sy-vline 
WA_RC29N_STR-NCLNR sy-vline 
WA_RC29N_STR-NDOAR sy-vline 
WA_RC29N_STR-NDONR sy-vline 
WA_RC29N_STR-NDOTL sy-vline 
WA_RC29N_STR-NDOVR sy-vline 
WA_RC29N_STR-NEWNO sy-vline 
WA_RC29N_STR-NIDNR sy-vline 
WA_RC29N_STR-OBKTX sy-vline 
WA_RC29N_STR-OCLAR sy-vline 
WA_RC29N_STR-OCLNR sy-vline 
WA_RC29N_STR-ODOAR sy-vline 
WA_RC29N_STR-ODONR sy-vline 
WA_RC29N_STR-ODOTL sy-vline 
WA_RC29N_STR-ODOVR sy-vline 
WA_RC29N_STR-OIDNR sy-vline 
WA_RC29N_STR-OOKTX sy-vline 
WA_RC29N_STR-PSPNR sy-vline 
WA_RC29N_STR-PRTXT sy-vline 
WA_RC29N_STR-REENR sy-vline 
WA_RC29N_STR-REVLV sy-vline 
WA_RC29N_STR-STLAL sy-vline 
WA_RC29N_STR-STLAN sy-vline 
WA_RC29N_STR-STLNR sy-vline 
WA_RC29N_STR-STOBJ sy-vline 
WA_RC29N_STR-TETYP sy-vline 
WA_RC29N_STR-TPLNR sy-vline 
WA_RC29N_STR-TYPTX sy-vline 
WA_RC29N_STR-VBELN sy-vline 
WA_RC29N_STR-VBPOS sy-vline 
WA_RC29N_STR-VCLAS sy-vline 
WA_RC29N_STR-VDKNR sy-vline 
WA_RC29N_STR-VDKAR sy-vline 
WA_RC29N_STR-VDKTL sy-vline 
WA_RC29N_STR-VDKVR sy-vline 
WA_RC29N_STR-VEQNR sy-vline 
WA_RC29N_STR-VKLAR sy-vline 
WA_RC29N_STR-VMTNR sy-vline 
WA_RC29N_STR-VTPNR sy-vline 
WA_RC29N_STR-WERKS sy-vline 
WA_RC29N_STR-WTEXT sy-vline 
WA_RC29N_STR-ZWERK sy-vline 
WA_RC29N_STR-ZWTXT sy-vline 
WA_RC29N_STR-MAKN1 sy-vline 
WA_RC29N_STR-MAKN2 sy-vline 
WA_RC29N_STR-MAKN3 sy-vline 
WA_RC29N_STR-MCLMT sy-vline 
WA_RC29N_STR-STLMN sy-vline 
WA_RC29N_STR-STLMX sy-vline      INTO ld_text SEPARATED BY SPACE.

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