ABAP Select data from SAP table WCHECK_DETAIL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WCHECK_DETAIL
*  INTO TABLE @DATA(IT_WCHECK_DETAIL2).
*--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_WCHECK_DETAIL INDEX 1 INTO DATA(WA_WCHECK_DETAIL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WCHECK_DETAIL>-WCHECK_O = 1.
<WCHECK_DETAIL>-RES_COUNT = 1.
<WCHECK_DETAIL>-ITOBTYP = 1.
<WCHECK_DETAIL>-OBTYP = 1.
<WCHECK_DETAIL>-EQART = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WCHECK_DETAIL-OBJNR, sy-vline,
  WA_WCHECK_DETAIL-WCHECK_OBJ, sy-vline,
  WA_WCHECK_DETAIL-OBJTX, sy-vline,
  WA_WCHECK_DETAIL-GAART, sy-vline,
  WA_WCHECK_DETAIL-GAATX, sy-vline,
  WA_WCHECK_DETAIL-MGANR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WCHECK_DETAIL 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_WCHECK_DETAIL 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_WCHECK_DETAIL INTO WA_WCHECK_DETAIL.


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

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

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

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

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

*Conversion exit CUNIT, internal->external for field DELTA_SI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_WCHECK_DETAIL-DELTA_SI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WCHECK_DETAIL-DELTA_SI.
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_WCHECK_DETAIL_STR, 
WCHECK_O TYPE STRING,
RES_COUNT TYPE STRING,
ITOBTYP TYPE STRING,
OBTYP TYPE STRING,
EQART TYPE STRING,
OBJNR TYPE STRING,
WCHECK_OBJ TYPE STRING,
OBJTX TYPE STRING,
GAART TYPE STRING,
GAATX TYPE STRING,
MGANR TYPE STRING,
GAKTX TYPE STRING,
RES_POS TYPE STRING,
POSNM TYPE STRING,
POSTX TYPE STRING,
LSTNR TYPE STRING,
INEXCL TYPE STRING,
VGLZA TYPE STRING,
GAZPS TYPE STRING,
GAZNA TYPE STRING,
GAZBZ TYPE STRING,
START_DATE TYPE STRING,
ENDE_DATE TYPE STRING,
DELTA_DATE TYPE STRING,
START_WE TYPE STRING,
START_MSE TYPE STRING,
START_SI TYPE STRING,
STAND_DATE TYPE STRING,
STAND_WE TYPE STRING,
STAND_MSE TYPE STRING,
STAND_SI TYPE STRING,
ENDE_WE TYPE STRING,
ENDE_MSE TYPE STRING,
ENDE_SI TYPE STRING,
DELTA_WE TYPE STRING,
DELTA_MSE TYPE STRING,
DELTA_SI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WCHECK_DETAIL_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_WCHECK_DETAIL_STR-WCHECK_O sy-vline 
WA_WCHECK_DETAIL_STR-RES_COUNT sy-vline 
WA_WCHECK_DETAIL_STR-ITOBTYP sy-vline 
WA_WCHECK_DETAIL_STR-OBTYP sy-vline 
WA_WCHECK_DETAIL_STR-EQART sy-vline 
WA_WCHECK_DETAIL_STR-OBJNR sy-vline 
WA_WCHECK_DETAIL_STR-WCHECK_OBJ sy-vline 
WA_WCHECK_DETAIL_STR-OBJTX sy-vline 
WA_WCHECK_DETAIL_STR-GAART sy-vline 
WA_WCHECK_DETAIL_STR-GAATX sy-vline 
WA_WCHECK_DETAIL_STR-MGANR sy-vline 
WA_WCHECK_DETAIL_STR-GAKTX sy-vline 
WA_WCHECK_DETAIL_STR-RES_POS sy-vline 
WA_WCHECK_DETAIL_STR-POSNM sy-vline 
WA_WCHECK_DETAIL_STR-POSTX sy-vline 
WA_WCHECK_DETAIL_STR-LSTNR sy-vline 
WA_WCHECK_DETAIL_STR-INEXCL sy-vline 
WA_WCHECK_DETAIL_STR-VGLZA sy-vline 
WA_WCHECK_DETAIL_STR-GAZPS sy-vline 
WA_WCHECK_DETAIL_STR-GAZNA sy-vline 
WA_WCHECK_DETAIL_STR-GAZBZ sy-vline 
WA_WCHECK_DETAIL_STR-START_DATE sy-vline 
WA_WCHECK_DETAIL_STR-ENDE_DATE sy-vline 
WA_WCHECK_DETAIL_STR-DELTA_DATE sy-vline 
WA_WCHECK_DETAIL_STR-START_WE sy-vline 
WA_WCHECK_DETAIL_STR-START_MSE sy-vline 
WA_WCHECK_DETAIL_STR-START_SI sy-vline 
WA_WCHECK_DETAIL_STR-STAND_DATE sy-vline 
WA_WCHECK_DETAIL_STR-STAND_WE sy-vline 
WA_WCHECK_DETAIL_STR-STAND_MSE sy-vline 
WA_WCHECK_DETAIL_STR-STAND_SI sy-vline 
WA_WCHECK_DETAIL_STR-ENDE_WE sy-vline 
WA_WCHECK_DETAIL_STR-ENDE_MSE sy-vline 
WA_WCHECK_DETAIL_STR-ENDE_SI sy-vline 
WA_WCHECK_DETAIL_STR-DELTA_WE sy-vline 
WA_WCHECK_DETAIL_STR-DELTA_MSE sy-vline 
WA_WCHECK_DETAIL_STR-DELTA_SI sy-vline      INTO ld_text SEPARATED BY SPACE.

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