ABAP Select data from SAP table CKMLDUVACT_ENTRY_S_N into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CKMLDUVACT_ENTRY_S_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 CKMLDUVACT_ENTRY_S_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 CKMLDUVACT_ENTRY_S_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_CKMLDUVACT_ENTRY_S_N TYPE STANDARD TABLE OF CKMLDUVACT_ENTRY_S_N,
      WA_CKMLDUVACT_ENTRY_S_N TYPE CKMLDUVACT_ENTRY_S_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: <CKMLDUVACT_ENTRY_S_N> TYPE CKMLDUVACT_ENTRY_S_N.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CKMLDUVACT_ENTRY_S_N
*  INTO TABLE @DATA(IT_CKMLDUVACT_ENTRY_S_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_CKMLDUVACT_ENTRY_S_N INDEX 1 INTO DATA(WA_CKMLDUVACT_ENTRY_S_N2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CKMLDUVACT_ENTRY_S_N>-KOSTL = 1.
<CKMLDUVACT_ENTRY_S_N>-LSTAR = 1.
<CKMLDUVACT_ENTRY_S_N>-PROCESS = 1.
<CKMLDUVACT_ENTRY_S_N>-OBJNR = 1.
<CKMLDUVACT_ENTRY_S_N>-GJAHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CKMLDUVACT_ENTRY_S_N-BELNR, sy-vline,
  WA_CKMLDUVACT_ENTRY_S_N-DATE_FROM, sy-vline,
  WA_CKMLDUVACT_ENTRY_S_N-DATE_TO, sy-vline,
  WA_CKMLDUVACT_ENTRY_S_N-MENGE, sy-vline,
  WA_CKMLDUVACT_ENTRY_S_N-MEINS, sy-vline,
  WA_CKMLDUVACT_ENTRY_S_N-REC_USER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CKMLDUVACT_ENTRY_S_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_CKMLDUVACT_ENTRY_S_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_CKMLDUVACT_ENTRY_S_N INTO WA_CKMLDUVACT_ENTRY_S_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 ALPHA, internal->external for field KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CKMLDUVACT_ENTRY_S_N-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CKMLDUVACT_ENTRY_S_N-KOSTL.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

*Conversion exit CUNIT, internal->external for field SAVE_MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CKMLDUVACT_ENTRY_S_N-SAVE_MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CKMLDUVACT_ENTRY_S_N-SAVE_MEINS.
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_CKMLDUVACT_ENTRY_S_N_STR, 
KOSTL TYPE STRING,
LSTAR TYPE STRING,
PROCESS TYPE STRING,
OBJNR TYPE STRING,
GJAHR TYPE STRING,
BELNR TYPE STRING,
DATE_FROM TYPE STRING,
DATE_TO TYPE STRING,
MENGE TYPE STRING,
MEINS TYPE STRING,
REC_USER TYPE STRING,
REC_DATE TYPE STRING,
REC_TIME TYPE STRING,
STATUS TYPE STRING,
NO_DIST TYPE STRING,
BUDAT TYPE STRING,
METER TYPE STRING,
METER_MEINS TYPE STRING,
METER_SAVE TYPE STRING,
SAVE_MEINS TYPE STRING,
DIFF_QUANT_TOTAL TYPE STRING,
APLID TYPE STRING,
PROTNR TYPE STRING,
DATE_FROM_OLD TYPE STRING,
DATE_TO_OLD TYPE STRING,
MENGE_OLD TYPE STRING,
STATUS_OLD TYPE STRING,
OLD_ENTRIES TYPE STRING,
DELETE TYPE STRING,
POS_OK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CKMLDUVACT_ENTRY_S_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_CKMLDUVACT_ENTRY_S_N_STR-KOSTL sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-LSTAR sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-PROCESS sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-OBJNR sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-GJAHR sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-BELNR sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-DATE_FROM sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-DATE_TO sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-MENGE sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-MEINS sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-REC_USER sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-REC_DATE sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-REC_TIME sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-STATUS sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-NO_DIST sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-BUDAT sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-METER sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-METER_MEINS sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-METER_SAVE sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-SAVE_MEINS sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-DIFF_QUANT_TOTAL sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-APLID sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-PROTNR sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-DATE_FROM_OLD sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-DATE_TO_OLD sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-MENGE_OLD sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-STATUS_OLD sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-OLD_ENTRIES sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-DELETE sy-vline 
WA_CKMLDUVACT_ENTRY_S_N_STR-POS_OK sy-vline      INTO ld_text SEPARATED BY SPACE.

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