ABAP Select data from SAP table RNMCONS 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 RNMCONS 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 RNMCONS. 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 RNMCONS 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_RNMCONS TYPE STANDARD TABLE OF RNMCONS,
      WA_RNMCONS TYPE RNMCONS,
      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: <RNMCONS> TYPE RNMCONS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RNMCONS
*  INTO TABLE @DATA(IT_RNMCONS2).
*--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_RNMCONS INDEX 1 INTO DATA(WA_RNMCONS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RNMCONS>-LFDAK = 1.
<RNMCONS>-AKTION = 1.
<RNMCONS>-AKSTAT = 1.
<RNMCONS>-FALNR = 1.
<RNMCONS>-MATNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RNMCONS-WERKS, sy-vline,
  WA_RNMCONS-EXMAT, sy-vline,
  WA_RNMCONS-ANFOE, sy-vline,
  WA_RNMCONS-ANPOE, sy-vline,
  WA_RNMCONS-MENGE, sy-vline,
  WA_RNMCONS-MEINS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RNMCONS 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_RNMCONS 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_RNMCONS INTO WA_RNMCONS.


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

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field CONSVA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RNMCONS-CONSVA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RNMCONS-CONSVA.
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_RNMCONS_STR, 
LFDAK TYPE STRING,
AKTION TYPE STRING,
AKSTAT TYPE STRING,
FALNR TYPE STRING,
MATNR TYPE STRING,
WERKS TYPE STRING,
EXMAT TYPE STRING,
ANFOE TYPE STRING,
ANPOE TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
CHARG TYPE STRING,
MATFTEXT TYPE STRING,
EXCHARG TYPE STRING,
CONSDT TYPE STRING,
CONSTM TYPE STRING,
PERNR TYPE STRING,
STORN TYPE STRING,
GERNR TYPE STRING,
CONSVA TYPE STRING,
MATNR_X TYPE STRING,
WERKS_X TYPE STRING,
EXMAT_X TYPE STRING,
ANFOE_X TYPE STRING,
ANPOE_X TYPE STRING,
MENGE_X TYPE STRING,
MEINS_X TYPE STRING,
CHARG_X TYPE STRING,
MATFTEXT_X TYPE STRING,
EXCHARG_X TYPE STRING,
CONSDT_X TYPE STRING,
CONSTM_X TYPE STRING,
PERNR_X TYPE STRING,
STORN_X TYPE STRING,
GERNR_X TYPE STRING,
CONSVA_X TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RNMCONS_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_RNMCONS_STR-LFDAK sy-vline 
WA_RNMCONS_STR-AKTION sy-vline 
WA_RNMCONS_STR-AKSTAT sy-vline 
WA_RNMCONS_STR-FALNR sy-vline 
WA_RNMCONS_STR-MATNR sy-vline 
WA_RNMCONS_STR-WERKS sy-vline 
WA_RNMCONS_STR-EXMAT sy-vline 
WA_RNMCONS_STR-ANFOE sy-vline 
WA_RNMCONS_STR-ANPOE sy-vline 
WA_RNMCONS_STR-MENGE sy-vline 
WA_RNMCONS_STR-MEINS sy-vline 
WA_RNMCONS_STR-CHARG sy-vline 
WA_RNMCONS_STR-MATFTEXT sy-vline 
WA_RNMCONS_STR-EXCHARG sy-vline 
WA_RNMCONS_STR-CONSDT sy-vline 
WA_RNMCONS_STR-CONSTM sy-vline 
WA_RNMCONS_STR-PERNR sy-vline 
WA_RNMCONS_STR-STORN sy-vline 
WA_RNMCONS_STR-GERNR sy-vline 
WA_RNMCONS_STR-CONSVA sy-vline 
WA_RNMCONS_STR-MATNR_X sy-vline 
WA_RNMCONS_STR-WERKS_X sy-vline 
WA_RNMCONS_STR-EXMAT_X sy-vline 
WA_RNMCONS_STR-ANFOE_X sy-vline 
WA_RNMCONS_STR-ANPOE_X sy-vline 
WA_RNMCONS_STR-MENGE_X sy-vline 
WA_RNMCONS_STR-MEINS_X sy-vline 
WA_RNMCONS_STR-CHARG_X sy-vline 
WA_RNMCONS_STR-MATFTEXT_X sy-vline 
WA_RNMCONS_STR-EXCHARG_X sy-vline 
WA_RNMCONS_STR-CONSDT_X sy-vline 
WA_RNMCONS_STR-CONSTM_X sy-vline 
WA_RNMCONS_STR-PERNR_X sy-vline 
WA_RNMCONS_STR-STORN_X sy-vline 
WA_RNMCONS_STR-GERNR_X sy-vline 
WA_RNMCONS_STR-CONSVA_X sy-vline      INTO ld_text SEPARATED BY SPACE.

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