ABAP Select data from SAP table BUFFER_VIAK03 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP BUFFER_VIAK03 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 BUFFER_VIAK03. 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 BUFFER_VIAK03 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_BUFFER_VIAK03 TYPE STANDARD TABLE OF BUFFER_VIAK03,
      WA_BUFFER_VIAK03 TYPE BUFFER_VIAK03,
      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: <BUFFER_VIAK03> TYPE BUFFER_VIAK03.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_BUFFER_VIAK03.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM BUFFER_VIAK03
  INTO TABLE IT_BUFFER_VIAK03.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BUFFER_VIAK03
*  INTO TABLE @DATA(IT_BUFFER_VIAK032).
*--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_BUFFER_VIAK03 INDEX 1 INTO DATA(WA_BUFFER_VIAK032).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_BUFFER_VIAK03 ASSIGNING <BUFFER_VIAK03>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BUFFER_VIAK03>-MANDT = 1.
<BUFFER_VIAK03>-BUKRS = 1.
<BUFFER_VIAK03>-SWENR = 1.
<BUFFER_VIAK03>-SNKSL = 1.
<BUFFER_VIAK03>-SEMPSL = 1.

ENDLOOP.

LOOP AT IT_BUFFER_VIAK03 INTO WA_BUFFER_VIAK03.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BUFFER_VIAK03-SNKS, sy-vline,
  WA_BUFFER_VIAK03-JLOESCH, sy-vline,
  WA_BUFFER_VIAK03-RERF, sy-vline,
  WA_BUFFER_VIAK03-DERF, sy-vline,
  WA_BUFFER_VIAK03-TERF, sy-vline,
  WA_BUFFER_VIAK03-REHER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BUFFER_VIAK03 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_BUFFER_VIAK03 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_BUFFER_VIAK03 INTO WA_BUFFER_VIAK03.


*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 SWENR, internal->external for field SWENR
CALL FUNCTION 'CONVERSION_EXIT_SWENR_OUTPUT'
  EXPORTING
    input =                      WA_BUFFER_VIAK03-SWENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BUFFER_VIAK03-SWENR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SNKSL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BUFFER_VIAK03-SNKSL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BUFFER_VIAK03-SNKSL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SEMPSL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BUFFER_VIAK03-SEMPSL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BUFFER_VIAK03-SEMPSL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit IMKEY, internal->external for field IMKEY
CALL FUNCTION 'CONVERSION_EXIT_IMKEY_OUTPUT'
  EXPORTING
    input =                      WA_BUFFER_VIAK03-IMKEY
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BUFFER_VIAK03-IMKEY.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PRCTR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BUFFER_VIAK03-PRCTR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BUFFER_VIAK03-PRCTR.
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_BUFFER_VIAK03_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
SWENR TYPE STRING,
SNKSL TYPE STRING,
SEMPSL TYPE STRING,
SNKS TYPE STRING,
JLOESCH TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
IMKEY TYPE STRING,
PRCTR TYPE STRING,
JSPERR TYPE STRING,
DAEEND TYPE STRING,
RARTOPT TYPE STRING,
SABRG TYPE STRING,
INTRENO TYPE STRING,
SMIETR TYPE STRING,
XTEXTAE TYPE STRING,
GSBER TYPE STRING,
TXJCD TYPE STRING,
BERGRP TYPE STRING,
UEBERAE TYPE STRING,
JNOTAXCORR TYPE STRING,
SUTYPE TYPE STRING,
CREATIONTYPE TYPE STRING,
VALIDFROM TYPE STRING,
RESPONSIBLE TYPE STRING,
USEREXCLUSIVE TYPE STRING,
HAS_COSTOBJECT TYPE STRING,
EXCHANGETYPE TYPE STRING,
SETTLADVPAY TYPE STRING,
PERHEATING TYPE STRING,
PERHOTWATER TYPE STRING,
NOT_FOUND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BUFFER_VIAK03_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_BUFFER_VIAK03_STR-MANDT sy-vline 
WA_BUFFER_VIAK03_STR-BUKRS sy-vline 
WA_BUFFER_VIAK03_STR-SWENR sy-vline 
WA_BUFFER_VIAK03_STR-SNKSL sy-vline 
WA_BUFFER_VIAK03_STR-SEMPSL sy-vline 
WA_BUFFER_VIAK03_STR-SNKS sy-vline 
WA_BUFFER_VIAK03_STR-JLOESCH sy-vline 
WA_BUFFER_VIAK03_STR-RERF sy-vline 
WA_BUFFER_VIAK03_STR-DERF sy-vline 
WA_BUFFER_VIAK03_STR-TERF sy-vline 
WA_BUFFER_VIAK03_STR-REHER sy-vline 
WA_BUFFER_VIAK03_STR-RBEAR sy-vline 
WA_BUFFER_VIAK03_STR-DBEAR sy-vline 
WA_BUFFER_VIAK03_STR-TBEAR sy-vline 
WA_BUFFER_VIAK03_STR-RBHER sy-vline 
WA_BUFFER_VIAK03_STR-IMKEY sy-vline 
WA_BUFFER_VIAK03_STR-PRCTR sy-vline 
WA_BUFFER_VIAK03_STR-JSPERR sy-vline 
WA_BUFFER_VIAK03_STR-DAEEND sy-vline 
WA_BUFFER_VIAK03_STR-RARTOPT sy-vline 
WA_BUFFER_VIAK03_STR-SABRG sy-vline 
WA_BUFFER_VIAK03_STR-INTRENO sy-vline 
WA_BUFFER_VIAK03_STR-SMIETR sy-vline 
WA_BUFFER_VIAK03_STR-XTEXTAE sy-vline 
WA_BUFFER_VIAK03_STR-GSBER sy-vline 
WA_BUFFER_VIAK03_STR-TXJCD sy-vline 
WA_BUFFER_VIAK03_STR-BERGRP sy-vline 
WA_BUFFER_VIAK03_STR-UEBERAE sy-vline 
WA_BUFFER_VIAK03_STR-JNOTAXCORR sy-vline 
WA_BUFFER_VIAK03_STR-SUTYPE sy-vline 
WA_BUFFER_VIAK03_STR-CREATIONTYPE sy-vline 
WA_BUFFER_VIAK03_STR-VALIDFROM sy-vline 
WA_BUFFER_VIAK03_STR-RESPONSIBLE sy-vline 
WA_BUFFER_VIAK03_STR-USEREXCLUSIVE sy-vline 
WA_BUFFER_VIAK03_STR-HAS_COSTOBJECT sy-vline 
WA_BUFFER_VIAK03_STR-EXCHANGETYPE sy-vline 
WA_BUFFER_VIAK03_STR-SETTLADVPAY sy-vline 
WA_BUFFER_VIAK03_STR-PERHEATING sy-vline 
WA_BUFFER_VIAK03_STR-PERHOTWATER sy-vline 
WA_BUFFER_VIAK03_STR-NOT_FOUND sy-vline      INTO ld_text SEPARATED BY SPACE.

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