ABAP Select data from SAP table CNMM_AUFK_MANDATORY_FLDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNMM_AUFK_MANDATORY_FLDS
*  INTO TABLE @DATA(IT_CNMM_AUFK_MANDATORY_FLDS2).
*--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_CNMM_AUFK_MANDATORY_FLDS INDEX 1 INTO DATA(WA_CNMM_AUFK_MANDATORY_FLDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNMM_AUFK_MANDATORY_FLDS>-AUFNR = 1.
<CNMM_AUFK_MANDATORY_FLDS>-RETCODE = 1.
<CNMM_AUFK_MANDATORY_FLDS>-MSGTY = 1.
<CNMM_AUFK_MANDATORY_FLDS>-GSBTR = 1.
<CNMM_AUFK_MANDATORY_FLDS>-KZAVC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNMM_AUFK_MANDATORY_FLDS-GLTRP, sy-vline,
  WA_CNMM_AUFK_MANDATORY_FLDS-OBJNR, sy-vline,
  WA_CNMM_AUFK_MANDATORY_FLDS-AUTYP, sy-vline,
  WA_CNMM_AUFK_MANDATORY_FLDS-AUART, sy-vline,
  WA_CNMM_AUFK_MANDATORY_FLDS-DISPO, sy-vline,
  WA_CNMM_AUFK_MANDATORY_FLDS-KDAUF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNMM_AUFK_MANDATORY_FLDS 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_CNMM_AUFK_MANDATORY_FLDS 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_CNMM_AUFK_MANDATORY_FLDS INTO WA_CNMM_AUFK_MANDATORY_FLDS.


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

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

*Conversion exit ABPSP, internal->external for field PSPEL
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_CNMM_AUFK_MANDATORY_FLDS-PSPEL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNMM_AUFK_MANDATORY_FLDS-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_CNMM_AUFK_MANDATORY_FLDS_STR, 
AUFNR TYPE STRING,
RETCODE TYPE STRING,
MSGTY TYPE STRING,
GSBTR TYPE STRING,
KZAVC TYPE STRING,
GLTRP TYPE STRING,
OBJNR TYPE STRING,
AUTYP TYPE STRING,
AUART TYPE STRING,
DISPO TYPE STRING,
KDAUF TYPE STRING,
KDPOS TYPE STRING,
PSPEL TYPE STRING,
AUFPL TYPE STRING,
WERKS TYPE STRING,
NODE_KEY TYPE STRING,
KTEXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNMM_AUFK_MANDATORY_FLDS_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_CNMM_AUFK_MANDATORY_FLDS_STR-AUFNR sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-RETCODE sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-MSGTY sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-GSBTR sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-KZAVC sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-GLTRP sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-OBJNR sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-AUTYP sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-AUART sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-DISPO sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-KDAUF sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-KDPOS sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-PSPEL sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-AUFPL sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-WERKS sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-NODE_KEY sy-vline 
WA_CNMM_AUFK_MANDATORY_FLDS_STR-KTEXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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