ABAP Select data from SAP table VNWOINC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VNWOINC
*  INTO TABLE @DATA(IT_VNWOINC2).
*--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_VNWOINC INDEX 1 INTO DATA(WA_VNWOINC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VNWOINC>-MANDT = 1.
<VNWOINC>-PATNR = 1.
<VNWOINC>-DOKAR = 1.
<VNWOINC>-DOKNR = 1.
<VNWOINC>-DOKVR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VNWOINC-DOKTL, sy-vline,
  WA_VNWOINC-LFDDOK, sy-vline,
  WA_VNWOINC-WORK_ACC, sy-vline,
  WA_VNWOINC-OTHER_ACC, sy-vline,
  WA_VNWOINC-D_ARZT, sy-vline,
  WA_VNWOINC-WOINC_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VNWOINC 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_VNWOINC 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_VNWOINC INTO WA_VNWOINC.


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

*Conversion exit ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VNWOINC-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VNWOINC-DOKNR.
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_VNWOINC_STR, 
MANDT TYPE STRING,
PATNR TYPE STRING,
DOKAR TYPE STRING,
DOKNR TYPE STRING,
DOKVR TYPE STRING,
DOKTL TYPE STRING,
LFDDOK TYPE STRING,
WORK_ACC TYPE STRING,
OTHER_ACC TYPE STRING,
D_ARZT TYPE STRING,
WOINC_TYPE TYPE STRING,
CARE_NECC TYPE STRING,
ESREGSEG TYPE STRING,
ESSITPAC TYPE STRING,
ESTRAMED TYPE STRING,
ESPRUDIA TYPE STRING,
ESDURPRE TYPE STRING,
ESDOLPAD TYPE STRING,
ESCURSEI TYPE STRING,
ESPARCON TYPE STRING,
ESCAUALT TYPE STRING,
ESFECFIN TYPE STRING,
ESPARMUT TYPE STRING,
ESJUSPRO TYPE STRING,
ESRAZDES TYPE STRING,
ESULTPAR TYPE STRING,
ESDIAMED TYPE STRING,
ESTRAPOS TYPE STRING,
ESFECCUR TYPE STRING,
ESLESRES TYPE STRING,
ESAGOREH TYPE STRING,
ESALTMED TYPE STRING,
ESFECALT TYPE STRING,
ESRESEXP TYPE STRING,
ESMOTCAM TYPE STRING,
ESEXPMOT TYPE STRING,
ESEMPCAU TYPE STRING,
ESMODENT TYPE STRING,
ESPRORRO TYPE STRING,
KZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VNWOINC_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_VNWOINC_STR-MANDT sy-vline 
WA_VNWOINC_STR-PATNR sy-vline 
WA_VNWOINC_STR-DOKAR sy-vline 
WA_VNWOINC_STR-DOKNR sy-vline 
WA_VNWOINC_STR-DOKVR sy-vline 
WA_VNWOINC_STR-DOKTL sy-vline 
WA_VNWOINC_STR-LFDDOK sy-vline 
WA_VNWOINC_STR-WORK_ACC sy-vline 
WA_VNWOINC_STR-OTHER_ACC sy-vline 
WA_VNWOINC_STR-D_ARZT sy-vline 
WA_VNWOINC_STR-WOINC_TYPE sy-vline 
WA_VNWOINC_STR-CARE_NECC sy-vline 
WA_VNWOINC_STR-ESREGSEG sy-vline 
WA_VNWOINC_STR-ESSITPAC sy-vline 
WA_VNWOINC_STR-ESTRAMED sy-vline 
WA_VNWOINC_STR-ESPRUDIA sy-vline 
WA_VNWOINC_STR-ESDURPRE sy-vline 
WA_VNWOINC_STR-ESDOLPAD sy-vline 
WA_VNWOINC_STR-ESCURSEI sy-vline 
WA_VNWOINC_STR-ESPARCON sy-vline 
WA_VNWOINC_STR-ESCAUALT sy-vline 
WA_VNWOINC_STR-ESFECFIN sy-vline 
WA_VNWOINC_STR-ESPARMUT sy-vline 
WA_VNWOINC_STR-ESJUSPRO sy-vline 
WA_VNWOINC_STR-ESRAZDES sy-vline 
WA_VNWOINC_STR-ESULTPAR sy-vline 
WA_VNWOINC_STR-ESDIAMED sy-vline 
WA_VNWOINC_STR-ESTRAPOS sy-vline 
WA_VNWOINC_STR-ESFECCUR sy-vline 
WA_VNWOINC_STR-ESLESRES sy-vline 
WA_VNWOINC_STR-ESAGOREH sy-vline 
WA_VNWOINC_STR-ESALTMED sy-vline 
WA_VNWOINC_STR-ESFECALT sy-vline 
WA_VNWOINC_STR-ESRESEXP sy-vline 
WA_VNWOINC_STR-ESMOTCAM sy-vline 
WA_VNWOINC_STR-ESEXPMOT sy-vline 
WA_VNWOINC_STR-ESEMPCAU sy-vline 
WA_VNWOINC_STR-ESMODENT sy-vline 
WA_VNWOINC_STR-ESPRORRO sy-vline 
WA_VNWOINC_STR-KZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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