ABAP Select data from SAP table GHO_WC_OVR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM GHO_WC_OVR
*  INTO TABLE @DATA(IT_GHO_WC_OVR2).
*--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_GHO_WC_OVR INDEX 1 INTO DATA(WA_GHO_WC_OVR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<GHO_WC_OVR>-MANDT = 1.
<GHO_WC_OVR>-NET_ID = 1.
<GHO_WC_OVR>-WC_ID = 1.
<GHO_WC_OVR>-FREQ = 1.
<GHO_WC_OVR>-MEDIUM = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_GHO_WC_OVR-VALID_FROM, sy-vline,
  WA_GHO_WC_OVR-VALID_TO, sy-vline,
  WA_GHO_WC_OVR-THEO_CALC_METHOD, sy-vline,
  WA_GHO_WC_OVR-NUM_OF_TESTS, sy-vline,
  WA_GHO_WC_OVR-CREATED_BY, sy-vline,
  WA_GHO_WC_OVR-CREATED_TST, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_GHO_WC_OVR 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_GHO_WC_OVR 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_GHO_WC_OVR INTO WA_GHO_WC_OVR.


*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 TPLNR, internal->external for field NET_ID
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_WC_OVR-NET_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_WC_OVR-NET_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field WC_ID
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_WC_OVR-WC_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_WC_OVR-WC_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit TPLNR, internal->external for field GHO_MV_NETOBJ_ID
CALL FUNCTION 'CONVERSION_EXIT_TPLNR_OUTPUT'
  EXPORTING
    input =                      WA_GHO_WC_OVR-GHO_MV_NETOBJ_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_WC_OVR-GHO_MV_NETOBJ_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GHO_MV_IMRC_POIN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_GHO_WC_OVR-GHO_MV_IMRC_POIN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_GHO_WC_OVR-GHO_MV_IMRC_POIN.
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_GHO_WC_OVR_STR, 
MANDT TYPE STRING,
NET_ID TYPE STRING,
WC_ID TYPE STRING,
FREQ TYPE STRING,
MEDIUM TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
THEO_CALC_METHOD TYPE STRING,
NUM_OF_TESTS TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_TST TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_TST TYPE STRING,
GLG_TCM TYPE STRING,
GLG_NUM_OF_TESTS TYPE STRING,
GHO_MV_NETOBJ_ID TYPE STRING,
GHO_MV_QTY_TYPE TYPE STRING,
GHO_MV_IMRC_POIN TYPE STRING,
NO_OF_TEST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_GHO_WC_OVR_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_GHO_WC_OVR_STR-MANDT sy-vline 
WA_GHO_WC_OVR_STR-NET_ID sy-vline 
WA_GHO_WC_OVR_STR-WC_ID sy-vline 
WA_GHO_WC_OVR_STR-FREQ sy-vline 
WA_GHO_WC_OVR_STR-MEDIUM sy-vline 
WA_GHO_WC_OVR_STR-VALID_FROM sy-vline 
WA_GHO_WC_OVR_STR-VALID_TO sy-vline 
WA_GHO_WC_OVR_STR-THEO_CALC_METHOD sy-vline 
WA_GHO_WC_OVR_STR-NUM_OF_TESTS sy-vline 
WA_GHO_WC_OVR_STR-CREATED_BY sy-vline 
WA_GHO_WC_OVR_STR-CREATED_TST sy-vline 
WA_GHO_WC_OVR_STR-CHANGED_BY sy-vline 
WA_GHO_WC_OVR_STR-CHANGED_TST sy-vline 
WA_GHO_WC_OVR_STR-GLG_TCM sy-vline 
WA_GHO_WC_OVR_STR-GLG_NUM_OF_TESTS sy-vline 
WA_GHO_WC_OVR_STR-GHO_MV_NETOBJ_ID sy-vline 
WA_GHO_WC_OVR_STR-GHO_MV_QTY_TYPE sy-vline 
WA_GHO_WC_OVR_STR-GHO_MV_IMRC_POIN sy-vline 
WA_GHO_WC_OVR_STR-NO_OF_TEST sy-vline      INTO ld_text SEPARATED BY SPACE.

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