ABAP Select data from SAP table V_KNC1_2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP V_KNC1_2 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 V_KNC1_2. 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 V_KNC1_2 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_V_KNC1_2 TYPE STANDARD TABLE OF V_KNC1_2,
      WA_V_KNC1_2 TYPE V_KNC1_2,
      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: <V_KNC1_2> TYPE V_KNC1_2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_V_KNC1_2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM V_KNC1_2
  INTO TABLE IT_V_KNC1_2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_KNC1_2
*  INTO TABLE @DATA(IT_V_KNC1_22).
*--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_V_KNC1_2 INDEX 1 INTO DATA(WA_V_KNC1_22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_V_KNC1_2 ASSIGNING <V_KNC1_2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_KNC1_2>-MANDT = 1.
<V_KNC1_2>-KUNNR = 1.
<V_KNC1_2>-BUKRS = 1.
<V_KNC1_2>-GJAHR = 1.
<V_KNC1_2>-ERDAT = 1.

ENDLOOP.

LOOP AT IT_V_KNC1_2 INTO WA_V_KNC1_2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_KNC1_2-USNAM, sy-vline,
  WA_V_KNC1_2-UMSAV, sy-vline,
  WA_V_KNC1_2-UM01S, sy-vline,
  WA_V_KNC1_2-UM01H, sy-vline,
  WA_V_KNC1_2-UM01U, sy-vline,
  WA_V_KNC1_2-UM02S, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_KNC1_2 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_V_KNC1_2 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_V_KNC1_2 INTO WA_V_KNC1_2.


*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 KUNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_V_KNC1_2-KUNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_KNC1_2-KUNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_V_KNC1_2-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_V_KNC1_2-GJAHR.
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_V_KNC1_2_STR, 
MANDT TYPE STRING,
KUNNR TYPE STRING,
BUKRS TYPE STRING,
GJAHR TYPE STRING,
ERDAT TYPE STRING,
USNAM TYPE STRING,
UMSAV TYPE STRING,
UM01S TYPE STRING,
UM01H TYPE STRING,
UM01U TYPE STRING,
UM02S TYPE STRING,
UM02H TYPE STRING,
UM02U TYPE STRING,
UM03S TYPE STRING,
UM03H TYPE STRING,
UM03U TYPE STRING,
UM04S TYPE STRING,
UM04H TYPE STRING,
UM04U TYPE STRING,
UM05S TYPE STRING,
UM05H TYPE STRING,
UM05U TYPE STRING,
UM06S TYPE STRING,
UM06H TYPE STRING,
UM06U TYPE STRING,
UM07S TYPE STRING,
UM07H TYPE STRING,
UM07U TYPE STRING,
UM08S TYPE STRING,
UM08H TYPE STRING,
UM08U TYPE STRING,
UM09S TYPE STRING,
UM09H TYPE STRING,
UM09U TYPE STRING,
UM10S TYPE STRING,
UM10H TYPE STRING,
UM10U TYPE STRING,
UM11S TYPE STRING,
UM11H TYPE STRING,
UM11U TYPE STRING,
UM12S TYPE STRING,
UM12H TYPE STRING,
UM12U TYPE STRING,
UM13S TYPE STRING,
UM13H TYPE STRING,
UM13U TYPE STRING,
UM14S TYPE STRING,
UM14H TYPE STRING,
UM14U TYPE STRING,
UM15S TYPE STRING,
UM15H TYPE STRING,
UM15U TYPE STRING,
UM16S TYPE STRING,
UM16H TYPE STRING,
UM16U TYPE STRING,
BABZG TYPE STRING,
UABZG TYPE STRING,
KZINS TYPE STRING,
KUMAG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_KNC1_2_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_V_KNC1_2_STR-MANDT sy-vline 
WA_V_KNC1_2_STR-KUNNR sy-vline 
WA_V_KNC1_2_STR-BUKRS sy-vline 
WA_V_KNC1_2_STR-GJAHR sy-vline 
WA_V_KNC1_2_STR-ERDAT sy-vline 
WA_V_KNC1_2_STR-USNAM sy-vline 
WA_V_KNC1_2_STR-UMSAV sy-vline 
WA_V_KNC1_2_STR-UM01S sy-vline 
WA_V_KNC1_2_STR-UM01H sy-vline 
WA_V_KNC1_2_STR-UM01U sy-vline 
WA_V_KNC1_2_STR-UM02S sy-vline 
WA_V_KNC1_2_STR-UM02H sy-vline 
WA_V_KNC1_2_STR-UM02U sy-vline 
WA_V_KNC1_2_STR-UM03S sy-vline 
WA_V_KNC1_2_STR-UM03H sy-vline 
WA_V_KNC1_2_STR-UM03U sy-vline 
WA_V_KNC1_2_STR-UM04S sy-vline 
WA_V_KNC1_2_STR-UM04H sy-vline 
WA_V_KNC1_2_STR-UM04U sy-vline 
WA_V_KNC1_2_STR-UM05S sy-vline 
WA_V_KNC1_2_STR-UM05H sy-vline 
WA_V_KNC1_2_STR-UM05U sy-vline 
WA_V_KNC1_2_STR-UM06S sy-vline 
WA_V_KNC1_2_STR-UM06H sy-vline 
WA_V_KNC1_2_STR-UM06U sy-vline 
WA_V_KNC1_2_STR-UM07S sy-vline 
WA_V_KNC1_2_STR-UM07H sy-vline 
WA_V_KNC1_2_STR-UM07U sy-vline 
WA_V_KNC1_2_STR-UM08S sy-vline 
WA_V_KNC1_2_STR-UM08H sy-vline 
WA_V_KNC1_2_STR-UM08U sy-vline 
WA_V_KNC1_2_STR-UM09S sy-vline 
WA_V_KNC1_2_STR-UM09H sy-vline 
WA_V_KNC1_2_STR-UM09U sy-vline 
WA_V_KNC1_2_STR-UM10S sy-vline 
WA_V_KNC1_2_STR-UM10H sy-vline 
WA_V_KNC1_2_STR-UM10U sy-vline 
WA_V_KNC1_2_STR-UM11S sy-vline 
WA_V_KNC1_2_STR-UM11H sy-vline 
WA_V_KNC1_2_STR-UM11U sy-vline 
WA_V_KNC1_2_STR-UM12S sy-vline 
WA_V_KNC1_2_STR-UM12H sy-vline 
WA_V_KNC1_2_STR-UM12U sy-vline 
WA_V_KNC1_2_STR-UM13S sy-vline 
WA_V_KNC1_2_STR-UM13H sy-vline 
WA_V_KNC1_2_STR-UM13U sy-vline 
WA_V_KNC1_2_STR-UM14S sy-vline 
WA_V_KNC1_2_STR-UM14H sy-vline 
WA_V_KNC1_2_STR-UM14U sy-vline 
WA_V_KNC1_2_STR-UM15S sy-vline 
WA_V_KNC1_2_STR-UM15H sy-vline 
WA_V_KNC1_2_STR-UM15U sy-vline 
WA_V_KNC1_2_STR-UM16S sy-vline 
WA_V_KNC1_2_STR-UM16H sy-vline 
WA_V_KNC1_2_STR-UM16U sy-vline 
WA_V_KNC1_2_STR-BABZG sy-vline 
WA_V_KNC1_2_STR-UABZG sy-vline 
WA_V_KNC1_2_STR-KZINS sy-vline 
WA_V_KNC1_2_STR-KUMAG sy-vline      INTO ld_text SEPARATED BY SPACE.

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