ABAP Select data from SAP table KO042 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KO042 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 KO042. 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 KO042 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_KO042 TYPE STANDARD TABLE OF KO042,
      WA_KO042 TYPE KO042,
      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: <KO042> TYPE KO042.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KO042.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KO042
  INTO TABLE IT_KO042.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KO042
*  INTO TABLE @DATA(IT_KO0422).
*--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_KO042 INDEX 1 INTO DATA(WA_KO0422).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KO042 ASSIGNING <KO042>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KO042>-REQ_CONS_K = 1.
<KO042>-REQ_CUST_W = 1.
<KO042>-REQ_COPY_T = 1.
<KO042>-REQ_MOVC_C = 1.
<KO042>-REQ_MOVO_O = 1.

ENDLOOP.

LOOP AT IT_KO042 INTO WA_KO042.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KO042-REQ_MOVE_E, sy-vline,
  WA_KO042-REQ_CLCP_M, sy-vline,
  WA_KO042-REQ_PUT__P, sy-vline,
  WA_KO042-REQ_PATC_D, sy-vline,
  WA_KO042-TASK_REP_R, sy-vline,
  WA_KO042-TASK_MOD_S, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KO042 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_KO042 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_KO042 INTO WA_KO042.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_KO042_STR, 
REQ_CONS_K TYPE STRING,
REQ_CUST_W TYPE STRING,
REQ_COPY_T TYPE STRING,
REQ_MOVC_C TYPE STRING,
REQ_MOVO_O TYPE STRING,
REQ_MOVE_E TYPE STRING,
REQ_CLCP_M TYPE STRING,
REQ_PUT__P TYPE STRING,
REQ_PATC_D TYPE STRING,
TASK_REP_R TYPE STRING,
TASK_MOD_S TYPE STRING,
TASK_UND_X TYPE STRING,
TASK_CUS_Q TYPE STRING,
PIEC_LST_F TYPE STRING,
PROJ_LST_G TYPE STRING,
REQ_DELE_L TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KO042_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_KO042_STR-REQ_CONS_K sy-vline 
WA_KO042_STR-REQ_CUST_W sy-vline 
WA_KO042_STR-REQ_COPY_T sy-vline 
WA_KO042_STR-REQ_MOVC_C sy-vline 
WA_KO042_STR-REQ_MOVO_O sy-vline 
WA_KO042_STR-REQ_MOVE_E sy-vline 
WA_KO042_STR-REQ_CLCP_M sy-vline 
WA_KO042_STR-REQ_PUT__P sy-vline 
WA_KO042_STR-REQ_PATC_D sy-vline 
WA_KO042_STR-TASK_REP_R sy-vline 
WA_KO042_STR-TASK_MOD_S sy-vline 
WA_KO042_STR-TASK_UND_X sy-vline 
WA_KO042_STR-TASK_CUS_Q sy-vline 
WA_KO042_STR-PIEC_LST_F sy-vline 
WA_KO042_STR-PROJ_LST_G sy-vline 
WA_KO042_STR-REQ_DELE_L sy-vline      INTO ld_text SEPARATED BY SPACE.

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