ABAP Select data from SAP table CNUTRIENT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNUTRIENT
*  INTO TABLE @DATA(IT_CNUTRIENT2).
*--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_CNUTRIENT INDEX 1 INTO DATA(WA_CNUTRIENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNUTRIENT>-MANDT = 1.
<CNUTRIENT>-NUTRIENTINTERNALID = 1.
<CNUTRIENT>-NUTRIENT = 1.
<CNUTRIENT>-NUTRIENTPRIMARYIDFGDESC = 1.
<CNUTRIENT>-NUTRIENTSECONDARYIDFGDESC = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNUTRIENT-NUTRIENTCREATEDBYUSER, sy-vline,
  WA_CNUTRIENT-NUTRIENTCREATEDBYUSERNAME, sy-vline,
  WA_CNUTRIENT-NUTRIENTCHANGEDBYUSER, sy-vline,
  WA_CNUTRIENT-NUTRIENTCHANGEDBYUSERNAME, sy-vline,
  WA_CNUTRIENT-NUTRIENTCREATIONDATE, sy-vline,
  WA_CNUTRIENT-NUTRIENTCHANGEDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNUTRIENT 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_CNUTRIENT 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_CNUTRIENT INTO WA_CNUTRIENT.


*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 NUTRIENTINTERNALID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CNUTRIENT-NUTRIENTINTERNALID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNUTRIENT-NUTRIENTINTERNALID.
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_CNUTRIENT_STR, 
MANDT TYPE STRING,
NUTRIENTINTERNALID TYPE STRING,
NUTRIENT TYPE STRING,
NUTRIENTPRIMARYIDFGDESC TYPE STRING,
NUTRIENTSECONDARYIDFGDESC TYPE STRING,
NUTRIENTCREATEDBYUSER TYPE STRING,
NUTRIENTCREATEDBYUSERNAME TYPE STRING,
NUTRIENTCHANGEDBYUSER TYPE STRING,
NUTRIENTCHANGEDBYUSERNAME TYPE STRING,
NUTRIENTCREATIONDATE TYPE STRING,
NUTRIENTCHANGEDATE TYPE STRING,
NUTRIENTHEADERSTATUS TYPE STRING,
NUTRIENTHEADERSTATUSDESC TYPE STRING,
NUTRIENTAUTHZNGROUP TYPE STRING,
SPECIFICATIONAUTHZNGROUPDESC TYPE STRING,
NUTRIENTTYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNUTRIENT_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_CNUTRIENT_STR-MANDT sy-vline 
WA_CNUTRIENT_STR-NUTRIENTINTERNALID sy-vline 
WA_CNUTRIENT_STR-NUTRIENT sy-vline 
WA_CNUTRIENT_STR-NUTRIENTPRIMARYIDFGDESC sy-vline 
WA_CNUTRIENT_STR-NUTRIENTSECONDARYIDFGDESC sy-vline 
WA_CNUTRIENT_STR-NUTRIENTCREATEDBYUSER sy-vline 
WA_CNUTRIENT_STR-NUTRIENTCREATEDBYUSERNAME sy-vline 
WA_CNUTRIENT_STR-NUTRIENTCHANGEDBYUSER sy-vline 
WA_CNUTRIENT_STR-NUTRIENTCHANGEDBYUSERNAME sy-vline 
WA_CNUTRIENT_STR-NUTRIENTCREATIONDATE sy-vline 
WA_CNUTRIENT_STR-NUTRIENTCHANGEDATE sy-vline 
WA_CNUTRIENT_STR-NUTRIENTHEADERSTATUS sy-vline 
WA_CNUTRIENT_STR-NUTRIENTHEADERSTATUSDESC sy-vline 
WA_CNUTRIENT_STR-NUTRIENTAUTHZNGROUP sy-vline 
WA_CNUTRIENT_STR-SPECIFICATIONAUTHZNGROUPDESC sy-vline 
WA_CNUTRIENT_STR-NUTRIENTTYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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