ABAP Select data from SAP table KGALF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KGALF
*  INTO TABLE @DATA(IT_KGALF2).
*--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_KGALF INDEX 1 INTO DATA(WA_KGALF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KGALF>-TEXT1 = 1.
<KGALF>-TEXT2 = 1.
<KGALF>-VALUE = 1.
<KGALF>-PERCENT = 1.
<KGALF>-STDRATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KGALF-QUANTITY, sy-vline,
  WA_KGALF-LEINH, sy-vline,
  WA_KGALF-FACTOR, sy-vline,
  WA_KGALF-WEIGHT, sy-vline,
  WA_KGALF-SWEIGHT, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_KGALF 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_KGALF 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_KGALF INTO WA_KGALF.


*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 AC152, internal->external for field VALUE
CALL FUNCTION 'CONVERSION_EXIT_AC152_OUTPUT'
  EXPORTING
    input =                      WA_KGALF-VALUE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KGALF-VALUE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LEINH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_KGALF-LEINH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KGALF-LEINH.
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_KGALF_STR, 
TEXT1 TYPE STRING,
TEXT2 TYPE STRING,
VALUE TYPE STRING,
PERCENT TYPE STRING,
STDRATE TYPE STRING,
QUANTITY TYPE STRING,
LEINH TYPE STRING,
FACTOR TYPE STRING,
WEIGHT TYPE STRING,
SWEIGHT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KGALF_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_KGALF_STR-TEXT1 sy-vline 
WA_KGALF_STR-TEXT2 sy-vline 
WA_KGALF_STR-VALUE sy-vline 
WA_KGALF_STR-PERCENT sy-vline 
WA_KGALF_STR-STDRATE sy-vline 
WA_KGALF_STR-QUANTITY sy-vline 
WA_KGALF_STR-LEINH sy-vline 
WA_KGALF_STR-FACTOR sy-vline 
WA_KGALF_STR-WEIGHT sy-vline 
WA_KGALF_STR-SWEIGHT sy-vline      INTO ld_text SEPARATED BY SPACE.

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