ABAP Select data from SAP table VIAKHOWP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM VIAKHOWP
*  INTO TABLE @DATA(IT_VIAKHOWP2).
*--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_VIAKHOWP INDEX 1 INTO DATA(WA_VIAKHOWP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<VIAKHOWP>-MANDT = 1.
<VIAKHOWP>-BUKRS = 1.
<VIAKHOWP>-MANDAT = 1.
<VIAKHOWP>-AESWENR = 1.
<VIAKHOWP>-AESNKSL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_VIAKHOWP-AESEMPSL, sy-vline,
  WA_VIAKHOWP-KSTAR, sy-vline,
  WA_VIAKHOWP-DVONPER, sy-vline,
  WA_VIAKHOWP-DBISPER, sy-vline,
  WA_VIAKHOWP-HOVERSN, sy-vline,
  WA_VIAKHOWP-DMBTR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_VIAKHOWP 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_VIAKHOWP 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_VIAKHOWP INTO WA_VIAKHOWP.


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

*Conversion exit SWENR, internal->external for field AESWENR
CALL FUNCTION 'CONVERSION_EXIT_SWENR_OUTPUT'
  EXPORTING
    input =                      WA_VIAKHOWP-AESWENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VIAKHOWP-AESWENR.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ALPHA, internal->external for field KSTAR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_VIAKHOWP-KSTAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_VIAKHOWP-KSTAR.
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_VIAKHOWP_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
MANDAT TYPE STRING,
AESWENR TYPE STRING,
AESNKSL TYPE STRING,
AESEMPSL TYPE STRING,
KSTAR TYPE STRING,
DVONPER TYPE STRING,
DBISPER TYPE STRING,
HOVERSN TYPE STRING,
DMBTR TYPE STRING,
SABRG TYPE STRING,
WAERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_VIAKHOWP_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_VIAKHOWP_STR-MANDT sy-vline 
WA_VIAKHOWP_STR-BUKRS sy-vline 
WA_VIAKHOWP_STR-MANDAT sy-vline 
WA_VIAKHOWP_STR-AESWENR sy-vline 
WA_VIAKHOWP_STR-AESNKSL sy-vline 
WA_VIAKHOWP_STR-AESEMPSL sy-vline 
WA_VIAKHOWP_STR-KSTAR sy-vline 
WA_VIAKHOWP_STR-DVONPER sy-vline 
WA_VIAKHOWP_STR-DBISPER sy-vline 
WA_VIAKHOWP_STR-HOVERSN sy-vline 
WA_VIAKHOWP_STR-DMBTR sy-vline 
WA_VIAKHOWP_STR-SABRG sy-vline 
WA_VIAKHOWP_STR-WAERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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