ABAP Select data from SAP table CNMMRESB_N into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNMMRESB_N
*  INTO TABLE @DATA(IT_CNMMRESB_N2).
*--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_CNMMRESB_N INDEX 1 INTO DATA(WA_CNMMRESB_N2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNMMRESB_N>-RSNUM = 1.
<CNMMRESB_N>-RSPOS = 1.
<CNMMRESB_N>-RSART = 1.
<CNMMRESB_N>-MATNR = 1.
<CNMMRESB_N>-MAKTX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNMMRESB_N-WERKS, sy-vline,
  WA_CNMMRESB_N-AUFNR, sy-vline,
  WA_CNMMRESB_N-VORNR, sy-vline,
  WA_CNMMRESB_N-UVORN, sy-vline,
  WA_CNMMRESB_N-PSPEL, sy-vline,
  WA_CNMMRESB_N-MATKL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNMMRESB_N 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_CNMMRESB_N 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_CNMMRESB_N INTO WA_CNMMRESB_N.


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

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

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

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

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_CNMMRESB_N-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMMRESB_N-PSPEL.
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_CNMMRESB_N_STR, 
RSNUM TYPE STRING,
RSPOS TYPE STRING,
RSART TYPE STRING,
MATNR TYPE STRING,
MAKTX TYPE STRING,
WERKS TYPE STRING,
AUFNR TYPE STRING,
VORNR TYPE STRING,
UVORN TYPE STRING,
PSPEL TYPE STRING,
MATKL TYPE STRING,
EKGRP TYPE STRING,
BDTER TYPE STRING,
POSTP TYPE STRING,
NPTXTKY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNMMRESB_N_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_CNMMRESB_N_STR-RSNUM sy-vline 
WA_CNMMRESB_N_STR-RSPOS sy-vline 
WA_CNMMRESB_N_STR-RSART sy-vline 
WA_CNMMRESB_N_STR-MATNR sy-vline 
WA_CNMMRESB_N_STR-MAKTX sy-vline 
WA_CNMMRESB_N_STR-WERKS sy-vline 
WA_CNMMRESB_N_STR-AUFNR sy-vline 
WA_CNMMRESB_N_STR-VORNR sy-vline 
WA_CNMMRESB_N_STR-UVORN sy-vline 
WA_CNMMRESB_N_STR-PSPEL sy-vline 
WA_CNMMRESB_N_STR-MATKL sy-vline 
WA_CNMMRESB_N_STR-EKGRP sy-vline 
WA_CNMMRESB_N_STR-BDTER sy-vline 
WA_CNMMRESB_N_STR-POSTP sy-vline 
WA_CNMMRESB_N_STR-NPTXTKY sy-vline      INTO ld_text SEPARATED BY SPACE.

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